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8350A Sweep Oscillator Operation and Service Manual

1. 22 Operating Information LIMITATIONS CONCERNS 1 The range of frequencies input to mainframe is determined by the plug in will accept values to 2 out of range CW resolution equals 4096 points per band includes 2 overange exceptin VERNIER Example using a 2 to 8 4 GHz plug in 1 6 MHz is the resolution The display range is 1 MHz to 99 99 GHz The order in which START STOP or CFAF are entered is not important START frequency must be lower than STOP frequency Entering a START frequency greater than the STOP frequency causes the STOP frequency to equal the START frequency If the START frequency is greater than the STOP then START equals the new STOP frequency Lights except as noted indicate active values function Frequency values entered do not change when mode is changed Sweep Out provides a 0 to 10 volt ramp for all sweeps with 0 volts corresponding to the effective start frequency and 10 volts to the stop frequency In CW mode the voltage out is equal to the percent of band except swept CW Vernier value can roll over if knob or step causes the vernier value to exceed the maximum value then the CW CF value is changed and the vernier value reset to0 MHz or appropriate value Figure 3 6 Frequency Sweep Mode 2 of 3 Model 8350A Model 8350A Operating Information LOCAL FUNCTION PROCEDURES Activate Data Forms Off Keyboard
2. Operating Information LOCAL OPERATOR S CHECKS DESCRIPTION The Preliminary check provides assurance that most of the internal functions of the Sweep Oscillator are working The main check provides a general check of the overall functions of the Sweep Oscillator PRELIMINARY CHECK Selftest Each time the Sweep Oscillator is turned on or INSTR PRESET button is engaged the instrument performs a series of self tests taking about one second to complete When the self test is complete the instrument will be in the preset mode if a plug in is installed or the left most frequency display will have an E001 error code indicating no plug in is installed If error code E016 is observed refer to paragraph 3 103 If another error code is noted the Sweep Oscillator requires service refer to paragraph 3 107 Plug in related error information E050 to E059 is in the plug in manual 1 Set LINE switch to ON Observe display in START STOP mode with display frequency equaling plug in range or E001 if no plug in is installed j MAIN CHECK Equipment HP 83500 series or HP 86200 series with adapter HP 11869A 18 GHz or less Oscilloscope HP 1220A or HP 1740A Crystal Detector frequency range of interest Attenuator 10 dB 8491B Option 010 Cables BNC to BNC 3 10503A 123 cm Setup 8350A SWEEP 83500 OSCILLATOR SERIES PLUG IN OSCILLOSCOPE E E On BLANK ern asa sus 0 0 RF OUTPUT 8473C 10 4
3. P P2 9439 a uss o 8 52 09 4 0000000000000000000000 P1 C cI Cc gt O a UN 5 RO 5 C s se 8 emuo ew g esu 92 Le e M e 8 o Lig ssu O Q onu G 858 6 p 5 o Cc 5 sjo 5 3 3 of 5 c 45 emm op ono 9 oro amp amp 8 5 3 5 5 815 i 3 i a 2 z o 9 2 0 ogo ee e Figure 5 11 Location of Manual Sweep Adjustment 23 Adjustments 5 18 T Press ADJUSTMENTS 5 16 MANUAL SWEEP ADJUSTMENT Cont d indicate level Model 8350A The FREQUENCY TIME display should e Sweep ramp generator DAC 502 to 4 bits below its maximum Adjust 5 43 MANUAL adjust until the voltage clamps at the upper limit The adjustment is correctly set at the point just when the voltage clamps at the maximum level typically about 10 Vdc Refer to Figure 5 11 for location of manual sweep adjustment 5 17 SWEEP RETRACE TIME ADJUSTMENTS REFERENCE 5 Sweep Generator DESCRIPTION The integrating capacators which are used to generate the sweep ramp on the 5 Sweep Generator discharge through ASR70 and ASR20 during sweep retrace By monitoring forward sweep time plus retrace time at the rear panel POS Z BLANK BNC output high sweep retrace
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5. HP 11525AC PROCEDURE Low Frequency Output VSWR Test NOTE A single section of 3 to 6 metre 10 to 20 feet 50 ohm cable is required to avoid mismatch of connector when performing the low frequency VSWR test 1 If the specified output frequency range of the plug in under test is lower than 2 GHz connect equipment as shown in Figure 4 10 if not go to step 7 2 Press INSTR PRESET STOP 2 GHZ s 8350A Set DISPLBLANK off and RF BLANK on 3 Adjust POWER level control on plug in for an maximum output power of 25 millvolts peak trace on oscilloscope display in order to keep crystal in square law output range 4 Select several points on trace and calculate V MAX V MIN see Figure 4 12 MEER A ASIN y LL ZERO VOLT REFERENCE VMAX 25 mV MAX Figure 4 12 Typical Low Frequency Swept VSWR Measurement 4 20 Model 8350A Performance Tests PERFORMANCE TESTS nr 4 18 OUTPUT VSWR TEST Cont d 5 Determine the loss at selected frequency of the length of coaxial cable between coupler end and cable open end using manufacturer s specifications for loss foot Refer to Table 4 4 6 Convert V MAX V MIN ratio noted in step 5 into sourch match SWR using Figure 4 13 and the cable loss calculated in step 5 The SWR should be less than noted on the performance test card step 6 High Frequency Output VSWR Test 7 Connect equipment as shown in
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7. E 000000000000 0000000000000000000000 k 2 ui 5 Figure 5 15 Location of 27 8 1 kHz Oscillator Adjustment 5 23 Adjustments Model 8350A ADJUSTMENTS E 5 19 FREQUENCY CONTROL ADJUSTMENTS REFERENCE A4 Scaling and Marker Assembly DESCRIPTION The A4U10 VERNIER DAC is first calibrated for symmetrical frequency operation with no RF plug in installed With the 8350A set to 200 MHz in CW mode A4R44 CW OFFSET is set to adjust the accuracy of the low end of the VERNIER frequency range A4R22 VERNIER is then adjusted to set the accuracy of the high end of the VERNIER frequency range The 8350A is then tuned to a CW frequency of 10 2 GHz and A4R27 CW is adjusted to set the CW frequency accuracy at the high end of the frequency band The A4 AF Generation circuits are then adjusted for frequency accuracy on each of three AF frequency ranges full band range 1 8 band range and 1 64 band range AF sweeps The high and low end accuracy of the full RF plug in band AF range is adjusted by A4R2 AF OFFSET and A4R25 The VERNIER then adjusts the center frequency to the exact center of the band in a 0 GHz AF sweep mode At this point the AF sweep range is narrowed to 1 299 GHz just below the switch point at 1 3 GHz where the resolution scaling of the A4 AF Generation circuits change from full band to lt 1 8 band range 4 15 AF2 is then adjusted to calibrate the resolut
8. Figure 4 9 Spurious Signals Test Setup EQUIPMENT RF Plug in ba ne ba aa ee od HP 83500 series Spectrum Analyzer HP 8565A 10 dB Attenuator HP 8491B Option 010 PROCEDURE 1 Connect equipment as shown in Figure 4 9 2 Set controls as follows 8565A 7 Set all Normal Settings controls marked with green FREQUENCY BAND 2 01 1 8 INPUT ATTEN RE Ruhr Re o cR Ace enn 10 dB REF LEVEL dBm Setfor same level as plug in maximum leveled power FREQUENCY SPAN FULL BAND 8350A Press INSTR PRESET CW and enter the low frequency limit of the plug in used Plug in POWER n ELA de eb p P maximum specified CW HETER ON Performance Tests i PERFORMANCE TESTS 4 17 SPURIOUS SIGNALS TEST Cont d NOTE The spectrum analyzer originates some mixing products that may appear on the display If a signal is in question increase the spectrum analyzer input attenuation by 10 dB note if signal decreases in amplitude by 10 dB then return the attenuator to the original position If the signal in question comes from an external source it will change by 10 dB If the signal in question originates in the spectrum analyzer the level will either change by
9. gt OC me m m FF HOODOO OOF OOH BROOK HOO _ OR OF OK OF OK OF OHO V Av Table 3 6 8350 Interface Functions Source handshake capability Acceptor handshake capability Basic talker Serial Poll Unaddress to talk if addressed to listen Basic listener Unaddressed to listen if addressed to talk Service Request capability Remote Local capability No Parallel Poll capability Device clear capability Device trigger capability No controller capability Open collector bus drivers Model 8350A 3 43 Compatible Universal and Addressed HP IB Commands 3 44 The 8350A will respond to the following universal and addressed commands which are sent in the command modes ATN true Universal DCL Device Clear DC4 LLO Local Lockout DC1 MLA My Listen Address selectable MTA My Talk Address selectable SPD Serial Poll Disable EM SPE Serial Poll Enable CAN UNL Unlisten UNT Untalk Addressed GET GTL SDC Group Execute Trigger Go to Local Selected Device Clear 3 45 Remote Mode 3 46 Remote
10. 2 Table 3 7 HP IB Program Codes Amplitude Marker On Off Alternate Sweep On Off Internal Leveling External Crystal Leveling External Power Meter Leveling Backspace Amplitude Crystal Marker On Off 83522 83525 Only Center Frequency Intensity Crystal Marker On Off 83522 83525 Only CW Frequency 1 MHz Crystal Marker Frequency 83522 83525 Only 10 MHz Crystal Marker Frequency 83522 83525 Only 50 MHz Crystal Marker Frequency 83522 83525 Only External Crystal Marker Frequency 83522 83525 Only Delta F Frequency Span dBm Step Down Decrement Display Blanking On Off Display Update On Off Exponent Power Of 10 Start Frequency Stop Frequency CW Filter In Out 20 MHz V FM 6 MHz V FM GHz Hz Input Learn String Instrument Preset Input Micro Learn String KHz Marker To Center Frequency Square Wave Amplitude Modula tion On Off Marker Off NOTES Model 8350A Marker 1 2 Sweep On Off Milliseconds MHz Marker Off Marker 1 Marker 2 Marker 3 Marker 4 Marker 5 Network Analyzer Trigger 8410B Output Active Parameter Output Learn String Output Mode String Output Interrogated Parameter Output Status bytes Output Micro Learn String Power Level Power Sweep On Off Recall Register RF Power On Off Service Request Mask RF Blanking On Off Reset Sweep Seconds Frequency Step Size Shift Function Slope On Off Manual Sweep Power Step Size Step
11. Operating Information LOCAL FUNCTION PROCEDURE Data Datafoms Function Activate On Off Knob Marker to gt CF Center Frequency Marker MKR Sweep SWEEP Permanent MKR Marker Sweep Turn Off Active Marker Turn Off All Markers Counter Interface Enable Counter Interface SHIFT M3 Disable 1 Values must end with terminator GHz or MHz Figure 3 8 Frequency Markers Sweep Time Marker Transfer 3 o f 4 28 Model 8350A Range and Resolution See plug in Resolution 024 of band Model 8350A Operating Information REMOTE FUNCTION PROCEDURE Program Code Select and hu Difference SH MI hu MKR CF Marker To AdweMekerTo MARKER Sweep ON SWEEP M1 and M2 OFF MARKER Permanent SWEEP Marker Sweep SH MP ALL OFF Markers Off EN Counting End Points FA FB or or Marker On to 5 Swept Frequency SH M2 Counter Interface Enable Active Marker Off to M5 Counter Interface Disables Figure 3 8 Frequency Markers Sweep Time Marker Transfer 4 of 4 29 Operating Information 30 Storage Registers DESCRIPTION The Save n function allows all the control settings to be stored in one of the nine internal registers The Recall n function will implement the previously stored settings Alter
12. n n 2 INT ARM ON OFF rear 0 OFF STORAGE ON OFF rear 66 ON POWER ak Ronee DRE ERU YU aie se heen is ON Input Amplifier Control Switch nn COM A Channel A Channel A Coupling DC Channel A ATTEN n ntn X10 Channel Trigger LEVEL 66 CCW Channel B SLOPE LA LA 5 28 5 29 Adjustments was 4 9 2 0 L EO G 5 G go 9 350 ere ozo 5 E O au 1 3 G ess o NP o 5 op 909 92 c 622 lt 5 Escort Q s 12 5 4 ue lt eeu PINE 2 5 28 2538 i 2 on 22 RUE oso 2 oho gt M o 929 N z A oft mus X 8 t E t Lo zi o _ S eR 1 58 18 E m lt Soue 8 gt e 5 Penis G zzu o ua tar 2 E mee PEN ep i 7 S ta o 82 Q 2 moo i gt Ro zuo 9 a g 8 2 gjs 5 5 gt 5 3 18 62 9 5 c o o o o 2 ECCE A t oossoo g Y 5
13. lt oseo 3 gt S suo gt 50 E o ouo D et onde 909 G9 Ry lt E 99 14 0 eve 9 529 amp 3 3 ac saj 5 5 9 5 0 42 2 ig 1T 5 d 25 5 ez a al s ul Bo w o sf U4 5 lt lt o zw o 9 3 N z ose tc 0 5 Loud e p e h lt 5 e o uv e N oo z 1 T Adjustments Model 8350A ADJUSTMENTS 5 20 MARKER DAC ADJUSTMENT Cont d Channel B Coupling d eiae EE DC Channel B ATTEN pates ERO HS 10 Channel Trigger LEVEL 4 Position the sweep oscillator upright as shown in Figure 5 18 and remove the top cover 5 Press INSTR PRESET STOP 1 0 GHz MI 1 0 GHz SWEEP TIME 1 s This sets marker 1 at the STOP frequency of 10 GHz 6 Preset AJR28 MER fully clockwise to insure that a marker will occur before the end of the Sweep ramp is reached 7 Set the 5328 FREQUENCY RESOLUTION control to 0 1 MHz 10 From the CCW position adjust Channel A and B trigger LEVELS CW until just past the point where both triggering LEDs blink This should typically occur atthe 10 o clock position on both trigger LEVEL controls The counter should now read approximately 4000 us NOTE The setting of the 5328 triggering controls is critical for an accurate time interval measurement 8 Adjust 4 28 MKR counterclockwi
14. Model 8350A Operating Information REMOTE FUNCTION PROCEDURE 8350A Output Response 90 bytes EOI ED Valid Functions FA CW CF DF FB MI M2 M3 4 5 VR SHVR SHMI SS ST SM PL PS SL SP OUTPUT LEARN STRING r Learn String INPUT LEARN STRING OUTPUT MICRO LEARN STRING INPUT MICRO LEARN STRING OUTPUT MODE STRING lt Output Interrogated Parameter OUTPUT INTERROGATE OUTPUT ACTIVE OUTPUT Status Bytes STATUS Request REQUEST Mask MASK Reset RESET Sweep SWEEP Take TAKE Sweep SWEEP d dddddE dd CR LF Function Prefix Output Active Parameter d dddddEtdd CR LF Output 2 bytes EOI Figure 3 17 HP IB Only Functions 5 of 7 1 byte RS TS Nn 49 Operating Information Model 8350A MODE STRING 1 of 2 SWEEP MODE Start Stop C CF AF SWEEP TRIGGER Int 00000000 00000001 00000010 00000000 00000001 00000010 00000011 00000000 00000001 00000010 SWEEP SOURCE MODULATION BLANKING 0000 1 Amplitude Mkr On Off On 1 Off 0 0000 1 Display Blanking On Off 0000 1 RF Blanking On Off Sq Wave Modulation On Off 00000000 ACTIVE MARKER 00000001 00000010 00000011 00000100 00000000 00000001 00000010 00000011 00000100 000 1 0
15. 5 12 AIRFLOW DETECTOR ADJUSTMENT Cont d M lt tc lt E 5 t m A7R58 AIRFLOW BAL ADJ ATTP5 7 4 qqo cm 9919 in Gv O 8 0 Li vR3 6 1 9 222 amp 8 H ge Q zu2 El tu iS 459 0 Ssa Hg 6 2 80 9 41 0 sf G zss o 11 0 ON G ot22 men we eine Figure 5 3 Location of AIRFLOW BALance Adjustment 5 8 Model 8350A Adjustments ADJUSTMENTS 5 13 5VB POWER SUPPLY ADJUSTMENT REFERENCE A7 Regulator Assembly DESCRIPTION ATR76 is selected to set the output of A7U10 5VB REG to 5 33 0 03 Vdc in a no load condition without an RF plug in installed SWEEP OSCILLATOR DIGITAL VOLTMETER TO A7TP2 5VB TO A7TP6 GND ANLG wox wo wow ou ow INPUT 2 WIRE Figure 5 4 5VB Power Supply Adjustment Setup EQUIPMENT Sweep Re s pre HP 8350A Digital Voltmeter HP 3455A PROCEDURE 1 Remove the RF plug in from the sweep oscillator mainframe 2 Set the LINE switch to ON and allow the sweep oscillator to warm up for 30 minutes 3 Position the sweep oscillator upright as shown in Figure 5 4 and remove the top cover 4 Connect a shorting jumper from the anode of A7CR22
16. d SECTION IV PERFORMANCE TESTS presents procedures required to verify that performance of the instrument is in accord ance with published specifications Per formance Tests which are general to most RF plug in units are given in the section Per formance Test limits and other special tests related to specific RF plug ins are suppliedin each RF plug in Operating and Service Manual Included is a Local and Remote Operation Verification procedure e SECTION V ADJUSTMENTS presents procedures required to properly adjust and align the Model 8350A Sweep Oscillator mainframe after repair Refer to the Oper ating and Service Manual of the specific RF plug in used for adjustments related to the RF plug in f SECTION VI REPLACEABLE PARTS provides information required to order all parts and assemblies 2 SECTION VII MANUAL BACKDATING CHANGES provides backdating informa tion required to make this manual com patible with earlier shipment configurations h SECTION VIII SERVICE provides an overall instrument block diagram with troubleshooting and repair procedures Each assembly within the instrument is covered on a separate Service Sheet which contains a circuit description schematic diagram com ponent location diagram and troubleshoot ing information to aid the proper mainten ance of the instrument 1 4 Supplied with this manual is an Operating Information Supplement This is simply a copy of the first three
17. 113 lUUD0PF 11 1 DC CEP AUF 20 CER iUF 2 20 Inl rC 51 0 LOUUDC CEF 81 LUNODC OLUF En g x i1ft DC DiiF 80 2n iUU DC iUF 80 01 Lud DC CEP QUE 4Bu gu inu pCc CEP en zn ino DEC HLUF z2 2 05 11007 CEF OLUF 50 51 LONVDC ulUF 0 0 LUNVDC en zn LuuUDC CER niUF 80 2u niUF 81 20 inn DC HiUF Bl 2zi 110002 CER ineOPF eint 80 20 lut DC iUF 2el zn 1 CER ULUF zf zus LOVEC Di1UF 81 20 9102 En 2 luu DC niUF 8 zn L nUpc CER 5 ZDI UDP HICA 5 HICK G 3n ene DO ZE en eile 20 75 Gen 10 15 an 200HH ENS 00 58 28431 zEAJ8I 248l zEe4en z84au 26450 28481 23431 28481 2 490 843 22420 25460 28431 Z82480 29481 28480 28428 2421 2848 451 25480 26481 25481 254811 7212 73176 2248 25430 25430 2542 Model 8350A Mfr Part Number Znp2 UeGnleCtCz DNDGUeGhielle 185007526 PLINBE ief 2lc5 0151 27103 filcti 2znE ley 2uEE nien zhet 16 5155 1 ICP 0158 3456 4160 2456 ien auca 1 0160 2155 0150 2155 2955 0160 2155 Uleh rz
18. Channel AC ou pling oorr resa EIE EE M EET AC Channel A ATTEN ius X10 Channel Trigger LEVEL CW 5 21 Adjustments 5 22 ADJUSTMENTS 5 18 27 8 1 kHz OSCILLATOR ADJUSTMENT Cont d NOTE When SQUARE WAVE MODULATION is selected the internal AM 27 8 1 kHz oscillator frequency will be determined by the position of the A5J2 frequency select jumper the oscillator has been initially calibrated for one frequency and the jumper is moved to the alternate frequency position the oscillator must be recalibrated for the new frequency setting Calibration for each frequency is thus independent for each jumper setting Steps 4 through 8 adjust the oscillator for 1 kHz modulation Steps 9 through 13 adjust the oscillator for 27 8 kHz modulation 1kHz Oscillator Adjustment 4 Set the 8350A LINE switch to OFF remove the A5 Sweep Generator assembly and set the frequency select jumper A5J2 to the 1kHz position Refer to Figure 5 15 for A5J2 jumper location Replace the A5 Sweep Generator assembly in the 8350A mainframe Connect the equipment as shown in Figure 5 15 Set the 8350A LINE switch to ON and press f Set the 5328A FREQUENCY RESOLUTIONN control to 1 Hz 106 Adjust Channel A Trigger LEVEL until the Channel A triggering LED blinks Adjust 5 51 SQUARE WAVE MODULATION FREQUENCY adjust for a counter reading of 1000 10 Hz 27 8 kHz Oscillator Adjustment 9 10 11 12
19. leading zeroes and carriage returns CR are ignored 3 65 Program Codes See Table 3 7 for the summary of input programming codes that are acceptible via the Data message 3 66 Sending The Data Message 3 67 The 8350A can send Data messages when in remote and addressed to talk The available output modes are Learn String Micro Learn String Mode String Interrogate Function Active Function Status Model 8350A 3 68 Each function is activated by the 8350A receiving a Data message with the appropriate function code refer to Table 3 7 The Learn String Micro Learn String Mode String and Status functions send a Data message consisting of a string of 8 bit binary bytes terminated using the bus END command EOI and ATN true with the last byte The Interrogate and Active func tions send a Data message consisting of a 14 character ASCII string representing the numeric value and terminated with a Carriage Return Line Feed CR LF 3 69 Binary Syntax b b EOI 3 70 Numeric Syntax d dddddE dd CR LF 3 71 The character b indicates an 8 bit binary byte and d indicates a decimal digit 0 through 9 The Characters indicate a variable number of the previous characters Note that the binary output format could have bytes that could be misinterpreted as Carriage Returns and or Line Feeds so the user should defeat the ASCII CR LF as a valid character string terminator 3 72
20. 2 6 A4R44 CW OFFSET G 833 0 wz ves P2 eo uO 000000000000000 o 00000000000 P 000000 000 E A sS gt lt S S 5 Y i gt S S S N ie S bo uta 3 Rz m oO u o 1 G 088 6 5 lt T G stu O g lt 5 lt tz 060 0 c G is st uO m oso En O 5 O A4R2 AF OFFSET 9 8 2 B va O 5 26 Model 8350A Adjustments ADJUSTMENTS 5 19 FREQUENCY CONTROL ADJUSTMENTS Cont d 14 Press INSTR PRESET AF 10 4 GHz SWEEP MAN 1 0 2 GHz 15 Adjust A4R25 for a DVM reading of 10 2000 0 0001 Vdc Refer to Figure 5 17 for adjustment location 16 Press 2 0 0 MHz 17 Adjust A4R2 AF OFFSET for a DVM reading of 0 2000 0 0001 Vdc Refer to Figure 5 17 for adjustment location 18 Press AF 0 GHz 19 Check to insure the DVM reading is 5 00000 0 00005 Vdc If itis not press rotate CW VERNIER until the DVM reading is 5 00000 0 00005 Vdc 20 Press AF 1 29 9 GHz 21 Adjust A4R15 AF2 for a DVM reading of 4 350
21. 71052 green LED should be lit Refer to Figure 5 2 for A7 Regulator component locations 5 Adjust A7R10 20 ADJ fora DVM reading of 20 000 0 001 Vdc Refer to Figure 5 2 for adjustment location 6 Connect the DVM to the bottom of the A9 Motherboard connector A9J2 pin 16 40V RETURN SENSE and A9J2 pin 15 40V SENSE A7DS4 should be lit Refer to Figure 5 2 for A7 Regulator component locations 7 Adjust A7R39 40V ADJ fora DVM reading of 40 000 0 002 Vdc Refer to Figure 5 2 for adjustment location 8 Connect the DVM to the bottom of the A9 Motherboard connector A9J2 pin 12 10V RETURN SENSE and A9J2 pin 11 10V SENSE A7DS3 should be lit Refer to Figure 5 2 for A7 Regulator component locations 9 Adjust A7R21 10V ADJ fora DVM reading of 10 000 0 001 Vdc Refer to Figure 5 2 for adjustment location 5 5 Model 8350A Adjustments o 2 e gt a lt 5 11 20V 40V and 10V POWER SUPPLY ADJUSTMENTS Cont d A7 REGULATOR N lt A7R39 40V REG ADJ A7R10 A7TP10 20V REG 20V REG ADJ A7TP3 10V REG 11 40V REG 7054 40REG gt a Su P G zzu o mis sumo O 148 0 oc G cea Elo iu3 E BER 6 27269 G E iu3 E 94 6 lt gt 108 0 ouo 0 2 ee 0 D ers G 1 6 87 g O
22. 86200 Series RF Plug in and provides the interface for signals and voltages from the Model 8350A to the RF plug in All of the Model 8350A standard operating features including HP IB remote programming are available however specific RF plug in functions output power level RF on off etc cannot be controlled or remotely pro grammed by the Model 8350A mainframe 1 62 Tousethe HP IB capabilities of the Model 8350A a computing controller such as the HP 9825 Desktop Computer or the HP 85 Personal Computer is needed 1 63 EQUIPMENT AVAILABLE 1 64 Service Accessories 1 65 AService Accessory Kit HP Part Number 08350 60020 is available for servicing the 8350A and 83500 series RF plug ins The accessory kit includes Two 44 pin printed circuit board extenders The HP Part Number for each extender is 08350 60031 These boards have keyed slots which allow them to be used in trouble shooting the Model 83500 series RF Plug ins as well 9 An RF Plug in extender cable set that provides all electrical connections when the RF Plug in is removed from the sweep oscillator The RF Plug in Interface Con nector is extended by one cable HP Part Number 08350 60034 and the Power Supply Interface connector is extended by the other cable HP Part Number 08350 60035 One hex Balldriver HP Part Number 8710 0523 Used to remove the hold down plate hex screws from the front panel when repair is necessary One 16 pin LC
23. FDsZ nHW 8 EI TO 18 PD 3eiunN TO 1E FP 3e trnW ENZ707H SI 10 15 40 2129117 SI TO 13 BHez2 n SI 70 16 FDPzS5unil 1264 F TC 0sin a 126 F TC lrinu 1 125W F 0 104 1 105 F TC 210n 125W F TC n i0n 125W F 0 1 16 125W F TCEn 19U 1 125W F 0 100 1 425W F 1 1 425W F TC 0 10N Wo i258 F TCH E2520 28434 44712 04712 2848 26491 44712 4713 04717 See introduction to this section for ordering information ndicates factory selec ted value 3503 8007 2114209 4 9 1854 1019 1254 0017 21125076 2 90 Tm 8 10 5118 amp Tu Ei1R F Tn 4c4 F 3 4 4641 10 1 amp Tu 1n l r PHESS 1 B TU Z1RS F 5 5 1 8 21 5 55 1 8 21 5 55 1 8 21 5 4 1 9 101 18 Model 8350 Reference Designation miTPIE 30 9 niuzu AZURE 2023 2024 202 HIUT1 BIJI 7024 2035 nZUie 16 0757 1442 1757 442 1757 1442 0767 0416 1757 0411 0757 0401 1678 3457 0757 0416 1757 1432 17857 1442 1757 44 1767 1442 0722 1442 1757 0442 3101 1243 0360 15625 1810 1203 4821 1989 EzU 1187 1221 1445 1529 23555 lgin u2an 1815 0391 16 2 1930 900114 05750 20015 25
24. Table 2 3 HP IB Address Codes Address Characters 851 Address Switch Settings MSB LSB Decimal Equivalent 0 0 0 0 0 A 0 0 0 0 1 1 B 0 0 0 1 0 1 C 0 0 0 1 1 3 D 0 0 1 0 4 E 0 0 1 0 5 F 0 0 1 1 0 6 G 0 0 1 1 1 7 H 0 1 0 0 8 1 0 1 0 0 1 9 J 0 1 0 1 0 K 0 1 0 1 1 L 0 1 1 0 0 M 0 1 1 0 1 N 0 1 1 1 0 0 0 1 1 1 1 0 P 1 0 0 0 1 Q 1 0 0 0 1 2 R 1 0 0 1 0 3 S 1 0 0 1 1 4 T 1 0 1 0 0 5 U 1 0 1 0 1 6 V 1 0 1 1 0 7 W 1 0 1 1 1 8 X l 1 0 0 0 9 Y 1 2 0 0 0 2 1 1 0 1 0 1 1 0 1 1 lt 1 1 1 0 1 1 1 1 0 1 gt 1 1 1 1 0 command is received If the identification lation frequency is selectable by an internal switch is set incorrectly the START STOP fre jumper to be either 27 8 kHz preset at the factory quencies will be in error Refer to Section II for use with Model 8755 Swept Amplitude Installation of the Model 11869A Operating and Analyzer systems or 1 kHz Refer to Section V Service Manual for instructions to properly setthe Adjustments in this manual for detailed infor identification switch mation on how to select and adjust the internal square wave modulation frequency 2 20 Internal Square Wave Modulation Frequency Selection 2 22 RF Plug in Configuration Switch 2 21 Internal square wave modulation is avail 2 23 Each RF plug in may have a configuration able at all sweep speeds on the Model 8350A s
25. 1 13 A complete listing of the safety symbols used in this manual is given on the page preceding Figure 1 1 Included are descriptions of symbols which refer the operator to the manual from the instrument Protective Earth Ground Frame or Chassis Terminals Warning and Caution symbols 1 14 INSTRUMENTS COVERED BY MANUAL 1 15 Attached to the rear panel of the instru ment is a serial number plate A typical serial number plate is shown in Figure 1 2 The serial SERIAL NUMBER PREFIX SUFFIX meten ten sER 1839A 00285 001 Ce O HEWLETT PACKARD n MADE IN USA Figure 1 2 Typical Serial Number Plate 1 6 Model 8350A number is in two parts The first four digits followed by a letter comprise the serial number prefix The last five digits form the sequential suffix that is unique to each instrument The content of this manual applies directly to instru ments having the same serial number prefix as those listed on the title page of this manual under SERIAL NUMBER 1 16 An instrument manufactured after the printing of this manual may have a serial prefix that is not listed on the title page An unlisted serial prefix indicates that the instrument is different from those documented in this manual The manual for the instrument is then supplied with a Manual Changes supplement that contains information that documents the differences 1 17 In addition to change information the Manual Changes sup
26. 13 Set the 8350A LINE switch to OFF remove the A5 Sweep Generator assembly and set the frequency select jumper A5J2 to the 27 8 kHz position Referto Figure 5 15 for A5J2 jumper location Replace the A5 Sweep Generator in the 8350A mainframe Connect the equipment as shown in Figure 5 14 Set the 8350A LINE switch to ON and press IN Adjust the 5328A Channel A Trigger LEVEL until the Channel A triggering LED blinks Adjust 5 51 SQUARE WAVE MODULATION FREQUENCY adjust for a counter reading of 27800 100 Hz Model 8350A Model 8350A Adjustments ADJUSTMENTS 5 18 27 8 1 kHz OSCILLATOR ADJUSTMENT Cont d SWEEP GENERATOR 5 2 FREQUENCY SELECT JUMPER 27 8 kHz 51 5 10 2 50 0 i gt 7777 1 977 Hu us ceu un cis ve Rae mi g fal ie MIL Mie 1 us 555 OE 15 M lcs T ch ua us 2 58 Pn u2 uta d x 8118 as BEEN 4 Wes pe si 0 g We s tue gt irm 3 Sl zm 1780 9 gi chs uz EES T 1 i uz vas ui BH Bun 5 D i A 5 ER T I zum T oy 554 GtRi Elg nuz ko 4 9120 o m
27. 19 Digital Ground in out 20 Pulse Request input 21 Counter trigger output 22 Step Up Advance input 23 Inverse Penlift output 24 8410 Ext Trigger output 25 ALT SWP INTERFACE connector may be connected to the 8755C ALT SWP INTERFACE connector via cable HP Part No 8120 3174 to provide Alter nate Sweep Function Open collector 4 volts dc 40 ma Figure 3 2 Rear Panel Features 1 Operating Information Model 8350A Table 3 1 Sweep Oscillator Operating Characteristics FREQUENCY RANGE Set automatically when plug in installed START STOP CENTER FREQUENCY AF SWEEP MODES Marker Center frequency Marker Sweep CW Frequency 5 settable frequency markers SWEEP TIME Range 01 100 seconds POWER Control power level with 83500 Series Plug ins Table 3 2 Functional Block Index 1 of 2 ALC Mode ALL OFF Alternate Sweep Storage Registers Amplitude Mkr Plug in Crystal Markers Amplitude Markers 8350A Modulation Blanking Back Space Data Entry Blanking Display Modulation Blanking Modulation Blanking RF Modulation Blanking Center Frequency Frequency Sweep Mode Crystal Markers Crystal Markers CW Mode Frequency Sweep Mode CW Filter Signal Control Data Entry Data Entry dB dBm Data Entry Delta A Frequency Frequency Sweep Mode Display Blanking Modulation Blanking Down step Data Entry External ALC External Sweep Sweep Sweep Trigger External Plug in M
28. 3 The displayed vernier adjustment can be up to 0 05 of the frequency band being swept When in a sub band of a multiband plug in for example the 0 01 2 GHz band of the 83525 01 8 4 GHz plug in the adjustment range will be 0 05 of the sub band This feature allows for better frequency resolution than would otherwise be possible with the vernier when using a multiband plug in The vernier adds its value to the appropriate frequency parameter and then resets to zero when the adjustment exceeds 0 05 for continuous adjustment 5 ZEROING VERNIER To set the vernier to zero press VERNIER 0 MHZ ms and the 0 lamp will turn off FREQUENCY OFFSET The frequency offset feature allows the CW frequency and or the effective center frequency of the swept range to be shifted by any amount up to the full range of the plug in 1 enter an offset press SHIFT VERNIER and enter the offset by either the left FREQUENCY control or data entry keyboard The amount of offset in GHz or MHz will be shown in the left FREQUENCY display and the 0 lamp will be lit 2 exit the displayed offset mode press the appropriate mode key 1 START CW etc The sweep limits displayed will appear to be unchanged however the 7 0 lamp will be on indicating the offset is present and the actual RF output frequency will be shifted To return display or adjustment the frequency offset press SHIFT VERNIER To zer
29. Amplitude Amplitude Marker On AKI Markers Amplitude Marker Off AKO Display Blanking On DP1 Display Blanking Off DPO Blanking RF Blanking On RF Blanking Off RPO Malas LJ Modulation On MDI oculation f Modulation off Figure 3 12 Modulation Blanking 2 of 2 37 Operating Information Model 8350A POWER Control DESCRIPTION This function block contains all functions relating to the RF output power level The desired power level can be set To compensate for a linear lose through a device like a cable on the output of the plug in a slope compensation can be set to level the output To provide a ramp of output power a power sweep width can be set and the Power Sweep function enabled Power Sweep starts the RF output power at the Power Level setting then ramps up the specific Power Sweep width PANEL LAYOUT dB SWP dBm dB GHz UNLEVELED POWER POWER SLOPE SWEEP LEVEL FUNCTIONS INDICATORS POWER LEVEL This function when enabled light on allows setting of the output power level for all ALC modes Calibrated power level in internal leveling mode only POWER SWEEP This function when enabled light on allows setting of the power sweep width in dB for the power sweep function Power Sweeps from Power Level to Power level plus Power Sweep width SLOPE This function when engaged light on allows setting of the frequency slope compensation in dB GHz Allows compensation for lossy devices to achieve a f
30. Model 8350A Performance Tests PERFORMANCE TESTS _ 4 13 FREQUENCY RANGE AND ACCURACY TEST Cont d 2 Set controls as follows Frequency Counter DINE E n dae siga e ao aas ON SAMPLE NC minimum full CCW Range connector 500 MHz to 27 GHz except as noted Impedance 2 2 2 _ 500 TIME rear FAST 3 Press 8350A INSTR PRESET key Note sweep oscillator display of START and STOP frequencies equals the frequency range on the test card i Frequency Range 4 Press 8350A CW key and enter the previously noted start frequency If start frequency is below 500 MHz use the 10 Hz to 500 MHz counter input connector If the frequency observed on frequency counter is greater than the start frequency rotate 8350A CW control counterclockwise until frequency on counter is at or below the specified start frequency Enter the frequency counter reading on the test card step 4 5 Enter the previously noted stop frequency If frequency observed on frequency counter is lower than the specified high frequency rotate the 8350 CW control clockwise until the frequency counter reading is higher or equals the specified high frequency Enter the frequency counter reading on the test card step 5 F
31. See introduction to this section tor ordering information ndicates factory selected value C4 1 C4 1 E Th 1Qu C4 41 g TU ilnz F C4 1 t Th S11F F C4 1 8 Th inl F C4 1 2 T 1u F C4 1 z Th L1ZZF F C4 1 E Th SL L1F F C4 1 2 Tu 1002 C4 1 E Th 1t u2 F C4 1 amp T LItuz F C4 1 z T 1i02 F L4 1 2 T l1ut7 F C4 1 z T u u ur F SINISE 4s OFDEF TEECPIFTION PUEHRA 74L 792FC Elum Lit AIRS Hill e514 9 n a3zSn Enlbtuc hots lua elles 1 2514 9 HI 1 6514 3 51174025271 zH 4LSu4H 4 74_51221 511744 512811 eil dL 2241 Elom it 374L 52 1 3 1 Riny Fint al SHPALE NUN Inausi in 1491 1177 40 0751 Model 8350A A3 MICROPROCESSOR CIRCUIT DESCRIPTION The circuits on the A3 Microprocessor assembly form a microprocessor based machine that controls the internal operation of the 8350B and RF Plugin installed A block diagram of A3 is shown in Figure 8 25 Control of the 8350B is implemented over two separate bus systems the Front Panel Bus and Instrument Bus Each bus consists of the following logic lines Control Lines Control direction and timing of data transfer and provide status information Address Lines Designates device or memory locati
32. 0698 3431 6 0757 0424 7 0757 0458 7 0698 3432 7 0757 0274 5 0757 0459 8 0698 3433 8 0757 0317 7 0757 0460 1 0757 0180 2 0757 1094 9 0757 0461 2 0698 3434 9 0757 0428 1 0757 0462 3 0698 3435 0 0757 0278 9 0757 0463 4 0757 0316 6 0698 0083 8 0757 0464 5 0698 4037 0 0698 0084 9 0757 0465 6 0757 0394 0 0698 3150 6 0757 0466 7 0757 0395 1 0698 0085 0 0757 0467 8 0757 0276 7 0698 3151 7 0698 3451 0 0757 0397 3 0757 0279 0 0698 3452 1 0757 0398 4 0698 3152 8 0757 0470 3 0757 0399 5 0698 3153 9 0698 3243 8 0757 0400 9 0698 3154 0 0698 3453 2 0757 0401 0 0698 3155 1 0698 3454 3 0757 0402 1 0757 0438 3 0698 3266 5 0757 0403 2 0757 0200 7 0698 3455 4 0698 3437 2 0757 0290 5 0698 3456 5 0698 3438 3 0757 0439 4 0698 3457 6 0757 0405 4 0757 0440 7 0698 3458 7 0698 3439 4 0757 0441 8 0698 3459 8 0698 3440 7 0757 0288 1 0698 3460 1 i 0698 3441 8 0757 0442 9 0698 3260 9 9 0 4 1 0 2 1 2 2 4 3 8 4 3 Adjustments Assembly Changed or Repaired Front Panel Front Panel Interface Microprocessor PROM Scaling and Marker Sweep Generator Rectifier Regulator HP IB Interface Paragraph REFERENCE A7 Regulator DESCRIPTION Table 5 4 Related Adjustments The 20V 40 and 10 power supplies are adjusted under load for the proper voltage levels with an HP 83500 Series RF plug in or HP 11869A RF Plug in Adapter installed Model 8350A Perform the Following Paragrap
33. 5VB GND REF to A7TP6 GND ANLG 5 Connect the DVM to A7TP2 5VB REG and A7TP6 GND ANLG ATDSI green LED should be lit 6 DVM should indicate 5 33 0 03 Vdc If it does not A7R76 must be changed as necessary to achieve the proper level Refer to Table 5 2 for the range of values allowable for A7R76 Refer to Figure 5 5 for A7R76 component location NOTE Decreasing A7R76 to the next lower recommended value shown in Table 5 3 will decrease the level of the 5VB power supply Inversely increasing the value of A7R76 to the next higher recommended value will increase the level of the 5VB power supply Model 8350A Adjustments ADJUSTMENTS 5 13 5VB POWER SUPPLY ADJUSTMENT Cont d tc o lt gt ul ATCR22 ANODE 5VB GND REF 7 2 A7 A7TP6 GND ANLG A7DS1 5VB REG 5VB REG A7R76 ge G amp 2u3 E E o ezu o Wie nO SHS P G zzu 6 Wer amp 1 G Eiu2 E G 128 6 sg OO To 6 232 183 0 20 01 G z u o OF G seu o 9 1 Q LAE suon O Figure 5 5 Location of 5VB Power Supply Adjustment 5 10 Model 8350A ADJUSTMENTS Adjustments 5 14 10V REF DAC POWER SUPPLY ADJUSTMENT REFERENCE 4 Scaling and Marker Assembly DESCRIPTION A4R59 10V REF ADI is adjusted for the proper voltage l
34. 8 1510 0280 1818 49791 1818 0990 1221 1720 1220 1681 1820 1199 1520 1244 1960 13717 18211 11681 1820 75 igzu izie le2u izie 1850 5178 1521 1717 1221 1317 18iu uzBu 1820 1917 1810 0238 1610 1338 1820 1917 151 1755 18 1 14 48554 80017 1820 1197 19tig n55ji 0159 1015 n41n n787 1481 1173 4 4 1751 7 o O uin butid 4 o at Q4 64 EO qi x n wb nd U4 n dme deu Table 6 2 Replaceable Parts Description ESISTOF 12 RESISTOR itl Les PESISTOF 111 lem PESTETIF tii 12 FESISTOF Lun 125 FESISTOF liu 1 LESW FESISTOF 113 1261 PESISTOF Sis FESISTOF Lu Lash FESISTOP 111 125M F 1254 12 M FESISTOD Lui lS FESISTOF Lil oo Lech DIP RELE ACC TEPNTileL TEST POLIT PCE Tessin TCzu 1ri TCzusll TCenx Lun iit TCeusl h TCsu iun TO 0e Lun 1 Z pC PES 4 CHTF TTL LE IC GATE TTL LE IC SCHHITT TFIG TTL LS 1 CHOS 4b STAT Fall CHOS 4096 dE STAT Fall E PROH PROCFSNHED E 4 E FROM cl CLOC 5
35. ATTENUATOR INPUT 4 18 AM ON OFF Ratio and Square Wave Symmetry Test Setup EQUIPMENT Plugin t HP 83500 series 10 dB HP 8491B Opt 010 Spectrum Analyzer eee tnn HP 8565A PROCEDURE 1 Conne ipment as shown in Figure 4 18 Press 8350A INS and engage OD Set 8350A frequency as shown on test card step 1 Set plug in to maximum rated output power 2 Set controls as follows 8565A j Set all Normal Settings controls marked with green FREQUENCY BAND 2 To cover CW set INPUT 10 dB REFERENCE 99 10 dBm FREQUENCY SPAN ZERO SPAN SWEEP TRIGGER cece cece tnn VIDEO RESOLUTION 3 MHz AUTO STABILIZER OFF SWEEP 1 msec for 1 kHz 3 Adjust spectrum analyzer TUNING control to observe signal CRT Adjust REFERENCE LEVEL to set signal on top trace Record AM ON OFF ratio on test card step 3 4 Record the symmetry of the observed signal on the test card step 4 5 SetCW frequency as indicated on test record card step 5 Repeat steps 3 and 4 and record results on test record card steps 5 4 29 Performance Tests x Model 8350A PERFORMANCE TESTS pS EEEa h 4 23
36. Cont d 2 Setadjustable line transformer using suitable monitor to the line voltage set on the 8350A power module Press the 8350 INSTR PRESET and CW key and enter the 8350A frequency shown on the test card Frequency Stability Step 2 Rotate frequency counter SAMPLE RATE knob to HOLD press SET OFS MHZ Blue Key then rotate the Frequency Counter SAMPLE RATE knob counter clockwise back to the normal position Table 4 3 High and Low Line Voltage Selection Table Nominal Line 100v 115 120V 220 240V Voltage Voltage High Line 105V 126V 231V 252V Voltage 3 Set adjustable line transformer to the low line voltage using suitable monitor which corresponds to the selected nominal voltage in Table 4 3 Check and record on the test record card step 3 the difference frequency displayed on counter 4 Set adjustable line transformer using suitable monitor to the high line voltage using suitable monitor which corresponds to the selected nominal voltage Check and record on the test record card step 4 the difference frequency displayed on counter Frequency Change with Time 10 minutes 5 Set adjustable line transformer voltage to nominal Set Plug In RF power and CW frequency to that shown on test card step 5 wait one minute for frequency counter and oscillator to settle 6 R he frequency counter SAMPLE RATE knob to HOLD press SET OFS N y then rotate the Frequency Counter SAMPLE RATE knob counter the nor
37. Input connector for External crystal detector and power meter outputs ALC CAL Used to adjust external leveling gain when using EXTERNAL leveling Clockwise rotation increases gain FREQUENCY CAL Adjustment that allows calibrating the RF plug in frequency using the crystal markers frequency marker indicator and a CW or Start Frequency value LIMITATIONS CONCERNS Only crystal detectors of negative polarity 10 to 150 millivolts can be used Only power meter outputs of 0 to 1 volts can be used The HP 431 and 432 series are compatible the HP 435 and 436 are not Figure 3 15 ALC Mode 83500 series plug ins 1 of 2 41 Operating Information Model 8350A LOCAL FUNCTION PROCEDURE Data Forms Range and Resolution Internal Leveling External Leveling Power Meter Leveling 1 Each mode disables all other appropriate modes REMOTE FUNCTION PROCEDURE i Te INTERNAL ALC Leveling External Crystal A2 External Power Meter 1 Mode disables all other possible modes FREQUENCY MARKER INDICATOR Lamp lites when RF output frequency is coincident with the selected crystal marker frequency Figure 3 15 ALC Mode 83500 series plug ins 2 of 2 42 Model 8350A Operating Information Crystal MARKER FREQUENCY DESCRIPTION This functional block controls the crystal frequency markers by selection of the marker crystal frequency and the marker display mode intensity or amplitude Cry
38. Model 8350A 3 30 The following list defines the terms and concepts that describe HP IB system operations Byte A unit of information consisting of 8 binary digits bits Device Any unit that is compatible with the IEEE Standard 488 1975 Device Dependent An action a device per forms in response to information sent on the HP IB The action is characteristic of an individual devices design and may vary from device to device Addressing The set of characters sent by a controller to specify which device will send infor mation on the bus and which device s will receive that information A device may also have its address fixed so that it may receive information listen only or send information talk only Polling The process by which a controller can identify a device that needs interaction with it The controller may poll devices for their operational condition one at a time which is termed a serial poll or as groups of devices simultaneously which is termed a parallel poll Data Bus 8 signal lines ata Byte Transfer ontrol 3 signal lines HANDSHAKE Lines General Interface Management Management CONTROL Lines 5 signal lines Figure 3 5 Interface Connections and Bus Structure Model 8350A 3 31 Basic Device Communication Capability 3 32 Devices which communicate along the interface bus fall into three basic categories Talkers Devices which send information on the
39. OPTION 909 HP Part No 5061 0083 CONTENTS 2 2 5020 8874 1 Rack Mount Flange 3 2 5060 9899 Front Handle Assembly 4 6 2510 0194 8 32 x 5 8 Screw Figure 2 11 Option 909 Rack Mount Kit with Handles 2 15 Installation Model 8350A e BO aa 9220 2733 9211 3462 4040 1738 2510 0103 9211 3463 9220 3365 9220 2950 9222 0484 Ne 4 0 OWN HP Part No n 7 5 o ir gt gt WAL 90 2 PLACES 4 NO Description FOAM PADS TOP CORNERS BOTTOM CORNERS CARTON INNER BARS SHIPPING NYLON SCREW FOR ATTACHING SHIPPING BARS CARTON OUTER SIDE PADS CORRUGATED CARDBOARD SLEEVE FOR MANUAL PROTECTION POLY BAG TO COVER INSTRUMENT NOT SHOWN Figure 2 12 Packaging for Shipment using Factory Packaging Materials Model 8350A 1 REMOVE RACK MOUNT FLANGE 3 AND OR FRONT HANDLE ASSEMBLY 00 2 ATTACH SHIPPING BARS WITH TWO 8 32 x 3 8 SCREWS 9 Refer to Figure 2 12 for Part Numbers of Shipping Bars and Screws Figure 2 13 Preparation of Instrument for Shipment Installation gt 2 17 Installation Rack Mount Kit with Front Handles a combi nation of the Option 907 Kit and the Option 908 Kit This kit supplies the necessary hardware and installation instructions for preparing the instru ment to mount on equipment rack with 482 6 mm 19 in support spacing with the addition of front handl
40. Pen Lift Recorder Mute Blanking Negative Logic True is logical t Positive Logic O Output Marker Pulse Request Retrace Alternate Sweep Enable Stop Sweep Request Digital Ground Blanking Pulse Request Counter Trigger Step Up Advance Inverse Pen Lift 8410 Ext Trigger Figure 16 Rear Panel Connections 25 Local Operation 26 APPENDIX 2 86200 SERIES PLUG INS WITH 11869A ADAPTER Figure 17 Connecting 11869A Adapter to 86200 series Plug in Although designed for the 8620 Sweep Oscillator the 86200 series RF Plug ins can be used in the 8350A Sweep Oscillator with the addition of the 11869A Adapter The11869A Adapter provides the electrical and mechanical interface between the 8350A andan 86200 series Plug in A switch on the 11869A allows the user to select the appropriate interface code from the code listing on the adapter so that an 86200 series Plug in can be used in the 8350A Allofthe standard performance and control ofthe 8350A is available when using an 86200 Plug in with the 11869A Adapter However plug in functions e g output power RF on off plug in markers will not be programmable and will not respond to keyboard and step keys On the rear panel of the 11869A Adapter are several hole plugs that allow connections to be made to the back panel ofthe plug in 11869A Option 004 provides two semi rigid cables to allow connection of 86200 series rear panel RF output to 11869A r
41. Test Clip HP Part Number 1400 0734 and one 20 pin 1 Test Clip HP Part Number 1400 0979 are provided as an aid for probing Integrated Circuits when troubleshooting 1 66 Model 8410B 8411A Network Analyzer 1 67 The Model 8350A Sweep Oscillator is compatible with the HP Model 8410B Network Analyzer system The combination of the Model 1 9 General Information 8410B Network Analyzer the Model 8411A Frequency Converter and an appropriate display plug in forms a phasemeter and a ratiometer for direct phase and amplitude ratio measurement on RF voltages These measurements can be made on single frequencies and on swept frequencies from 110 MHz to 18 GHz Several RF plug in units for the Model 8350A are capable of multi octive sweeps in this range The Model 8410B has an Auto Frequency range mode which gives it the capability of automatically tracking the Model 8350A Sweep Oscillator over octave and multi octave frequency bands Two interconnections to the Model 8350A are necessary to ensure that the Model 8410B will phase lock properly The Model 8410B Source Control Cable HP 08410 60146 connects the Model 8410B rear panel SOURCE CONTROL connector to the Model 8350A rear panel PROGRAMMING CONNECTOR Addi tionally the sweep oscillator RF plug in 1V GHz output connects to the Model 8410B rear panel FREQ REF INPUT The Model 8410B Source Control Cable connector pins and signals are illustrated in Table 1 3 1 68 Model 8
42. The FREQUENCY TIME display will display active marker frequency Marker A frequency Sweep Time or frequency in manual sweep mode PANEL LAYOUT FREQUENCY TIME GHz MKRA Q MKRA 1 M4 M5 ALLOFF E3 1 M2 FUNCTIONS INDICATORS Markers 1 to 5 Each marker M1 through 5 can be enabled and a frequency value defined The last marker engaged is the active marker and itis the one modifiable by the control step keys keyboard or remote control Lamp off indicates marker off lamp on indicates marker on and lamp flickering indicates marker is active Active marker off Turns off the active frequency marker and saves previous previous value The value is recalled when marker is turned on later All Markers Off Turns off all frequency markers saving the values of each to be recalled later when markers are turned on Marker Delta Selects the MKR A mode where the FREQUENCY TIME display indicates the frequency difference between the active frequency marker and the previously active frequency marker The active markeris still active and modifiable via the FREQUENCY TIME knob step keys keyboard or remotely If in intensity marker mode the display trace is intensified between the two selected frequency markers Marker to Center Frequency This function takes the value of the presently active frequency marker and reassigns it to the CW frequency Center Frequency or effective center frequency of the Start Stop sweep
43. low forward sweep with a time interval counter ASR70 is selected during 10 ms sweep to give a total sweep plus retrace time of 15 85 0 20 ms This insures that the sweep oscillator will trigger on the line frequency repetitively SWEEP OSCILLATOR UNIVERSAL COUNTER TO J5 POS Z BLANK Figure 5 12 Sweep Retrace Time Adjustments Setup EQUIPMENT Sweep Oscillators HP 8350A Universal HP 5328A PROCEDURE 1 Remove the RF plug in from the sweep oscillator mainframe 2 Setthe8350A LINE switch to ON and allow the sweep oscillator to warm up for 30 minutes NOTE The validity of this adjustment procedure is based in part on the accuracy of the sweep time adjustments Proper adjustment of the forward sweep times is necessary before proceeding with this adjustment procedure Model 8350A Adjustments ADJUSTMENTS 5 17 SWEEP RETRACE TIME ADJUSTMENTS Cont d SWEEP GENERATOR 5 A5R70 R31 6 36 Q R37 6 pe G R 3 6 B c amp 11 GRD n R20 9 GRI LR 9730 ORSIO a 16 c17 18 9 cane 0000000000000000000000 Figure 5 13 Location of Sweep Retrace Time Adjustments 5 19 Adjustments Model 8350A _ a i AD
44. performance standards These specifications may be found in Section I of the manual for the Plug in being tested Performance of the 8350A is verified if the RF Plug in meets its specifications How ever complete verification of the 8350A requires the use of a multiband plug in ie 83525A or 83592A None of the tests require access to the interior of the 8350A Sweep Oscillator NOTE Allow the 8350A Sweep Oscillator and RF Plug in to warm up for one hour prior to doing any performance tests 4 3 EQUIPMENT REQUIRED 4 4 Equipment required to test any Plug in with an output frequency up to 12 4 GHz is listed in the Recommended Test Equipment table in Section I of this manual The RF Plug in manual Recom mended Test Equipment table lists only the test equipment for that particular plug in Any equip ment that satisfies the critical specifications given in the tables may be substituted for the recom mended model 4 b OPERATION VERIFICATION 4 6 Operation Verification consists of perform ing the tests listed on paragraph 4 13 steps 1 to 13 and paragraph 4 14 steps 1 to 15 Operation Verification of the HP IB functions may be done by executing the program listed on Table 4 1 HP IB Operation Verification Program using the 9825A B Desktop Computer These tests provide reasonable assurance that the sweep oscillator and plug in are functioning properly and should meet the needs of an incoming inspection 8096 verification
45. sc fiJeli 2085 uleli zn5t 215 Ulen 2li5c 0160 2155 6181 2055 nijen T4tce 11 0 205 5 0150 2052 0160 21565 ieu z cE 016 215 DH15EeB80TUZnnW icF ENTAZONWICR Leui ugee isni nntein 1901 0951 1901 05 1936 0486 1391 1485 199 1486 1991 14654 LED LaHF LUN INT 1NCD IFe20li4 Ha BUR 5U LED LAMP LUH IIIT 1HCD IF z ll MHe LED LANP LUII IHT 1HCD BYR 5U LED L amp HP LUM INTSINCD PUR EU 28481 28490 26460 25491 5182 4584 EnB2 4634 5062 46584 t B2 4c84 rate z848u zEABU 1 51 515 1z51 telb5 11 1 POST CONNECTOR 3 Il FOET 1261 5178 151 5613 181 5041 u gSuz 8noni 1353 11405 1852 0405 1854 0119 1 4 0 19 1852 1281 1 52 1281 1854 1477 0757 11416 0757 0416 1 95 715 0698 2155 n7z7 uz8n 767 uz8 698 2430 0695 3420 0695 3451 0698 2430 757 u4 i 2 un BU 453 J NAANA ee S FI COIL TOFOID TRAHSISTOF FUP TPANSISTOR FHF TRHHSISTOP TPANSISTOP TRANSISTOR PHP TRRHSISTOF PHP 5 HFH PESISTOP 511 1 RESISTOR C11 1 4 c 4 ed FESISTOP ik 1 FESISTOP It 1 FESISTOF 2 RESISTOR 21 515 21 PESISTOF 21 AQ an un un c Lin 1 POST SI
46. settings can be stored in the8350A via theSAVE n n 1 through 9 function Instrument settings are stored in memory locations 1 through 9 and can be recalled randomly or in sequence 1 9 1 with Step Up Step Down keys or by contact closure to ground of the Step Up Advance pin 22 on the rear panel Programming Connector ALT n The ALT n function causes the RF output to alternate on successive sweeps between the current front panel setting and the setting stored in memory location n n 1 through 9 INSTRUMENT STATE Instrument Preset The Instrument Preset INSTR PRESET key sets the 8350A into the following predetermined state the RF output is swept over the full frequency range of the RF plug in at the specified maximum leveled power level an RF OFF condition can be selected by a presetable configuration switch located within the RF plug in the internal square wave AM is off and the frequency markers are off Instrument Preset also causes an internal analog and digital self test to occur If certain internal errors or failures are detected during the self test or during normal operation of the 8350A they are indicated via error code messages the formof Ennn where 0 through 9 read from the left FREQUENCY display local Operation The Local LCL key is used to return the 8350A to local control from the remotely controlled state The REM LED indi cates when the 8350A is being controlled rem
47. 1 i 1 E Performance Tests Model 8350A PERFORMANCE TESTS 4 15 FREQUENCY STABILITY TEST Cont d EQUENCY SWEEP OSCILLATOR RF PLUG IN FREQUENCY COUNTER ADJUSTABLE AC LINE TRANSFORMER ADAPTER 26 ADAPTER iem 20 dB ATTENUATOR Figure 4 5 Frequency Change with Line Voltage Change EQUIPMENT NOTE More than one model number is listed for some test equipment Use only the equipment needed to cover the line voltage used RE PPA HP 83500 series Frequency HP 5343A 20 dB HP 8491B Option 020 Adapter Type N male to APC 3 5 female Directional 1 HP 778D Adjustable AC Line Transformer and monitor Select for line voltage needed 100 120 volt General Radio WSMTB 120 V cose RU dea RCA WV 120B 220 240 volt General Radio W10HM73 240V WV 503A 3 dB HP 8491B Opt 003 Adjustable Short Maury Microwave 1953 2 PROCEDURE Frequency Change with Line Voltage Change l Connect equipment as shown in Figure 4 5 and set 8350A LINE switch to ON 4 12 Model 8350A Performance Tests PERFORMANCE TESTS 4 15 FREQUENCY STABILITY TEST
48. 1 REMOVE SIDE TRIM STRIPS 2 ATTACH FRONT HANDLE ASSEMBLY 2 WITH THREE 8 32 x 3 8 SCREWS 3 PER SIDE 3 PRESS FRONT HANDLE TRIM IN PLACE OPTION 907 HP Part No 5060 0089 CONTENTS RACK 5060 9899 Front Handle Assembly 2510 0195 8 32 x 3 8 Screw 5020 8896 Front Handle Trim Figure 2 9 Option 907 Front Handles Kit 2 13 Installation Model 8350A INSTALLATION INSTRUCTIONS e 1 REMOVE SIDE TRIM STRIPS 1 2 ATTACH RACK MOUNT FLANGE 2 WITH 8 32 x 3 8 SCREWS 3 3 REMOVE FEET AND TILT STANDS BEFORE RACK MOUNTING THIS ALSO REMOVES IN FORMATION CARD TRAY 5 TO RETAIN USE OF INFORMATION CARDS DO NOT REMOVE FEET AND WHEN RACK MOUNTING ALLOW APPROXIMATELY 2CM 3 4 INCH BELOW IN STRUMENT TO ACCOMODATE THE TRAY NO FILLER STRIP IS PROVIDED OPTION 908 HP Part No 5061 0077 CONTENTS om qm 2 2 5020 8862 7 Rack Mount Flange 3 6 2510 0913 9 148 32 x 3 8 Screw Figure 2 10 Option 908 Rack Mount Kit 2 14 Model 8350A Installation INSTALLATION INSTRUCTIONS REMOVE SIDE TRIM STRIPS 1 2 ATTACH RACK MOUNT FLANGE 2 AND FRONT HANDLE ASSEMBLY 3 WITH THREE 8 32 x 5 8 SCREWS 4 PER SIDE REMOVE FEET AND TILT STANDS BEFORE RACK MOUNTING THIS ALSO REMOVES INFORMATION CARD TRAY 5 TO RETAIN USE OF INFORMATION CARDS DO NOT RE MOVE FEET AND WHEN RACK MOUNTING ALLOW APPROXIMATELY 2CM 3 4 INCH BELOW INSTRUMENT TO ACCOMODATE THE TRAY NO FILLER STRIP IS PROVIDED
49. 34 g 50 lt lt s Ri 9 gt 9 8 5 lt B u Un i Model 8350A Adjustments ADJUSTMENTS is E A AC ECE 5 15 SWEEP TIME ADJUSTMENTS REFERENCE 5 Sweep Generator DESCRIPTION Programmable current source A5U2 is a 10 bit Digital to Analog Converter DAC whose output current determines the sweep time slope of the sweep ramp Input reference current is supplied by 10V REF power supply through ASR4 and 10 mSEC ADJ pot 5 2 for sweep times lt 1 second and additionally through ASR28 and 1 SEC ADJ pot ASR25 for sweep times from 1 second to 100 seconds 8350A rear panel POS Z BLANK BNC output goes low during the forward sweep time and is monitored by a time interval counter returns high during sweep retrace ASR2 is adjusted during a 10 ms sweep and ASR25 is adjusted during a 1 second sweep to give the proper forward sweep times for a fast and slow sweep SWEEP OSCILLATOR UNIVERSAL COUNTER o eso J5 POS 2 BLANK INPUTA Figure 5 8 Sweep Time Adjustments Setup EQUIPMENT Sweep HP 8350A Universal Counter ro HP 5328A PROCEDURE 1 Remove the RF plug in from the sweep oscillator mainframe 2 Setthe 8350A LINE switch to ON and allow the sweep oscillator to warm up for30 minutes NOTE The validity of this
50. 5 20 ADJUSTMENTS 5 17 SWEEP RETRACE TIME ADJUSTMENTS Cont d 3 Connect the POS Z BLANK BNC output connector on the rear panel of the 8350A to the INPUT connector on the 5328A Universal Counter and set the 5328A controls as follows FUNCTION e recs xav x EE SAMPLE RATE CCW OSC rear INT ARM ON OFF rear OFF STORAGE ON OFF rear panel ON POWER cades Vise e Us AR VIA SS ON Input Amplifier Control Switch SEP Channel A SLOPE ua ese oo ok sb as RR ERS Ore Channel eee ners DC Channel A ATTEN sn X10 Channel Trigger LEVEL CW 4 Position the sweep oscillator upright as shown in Figure 5 12 6 Set the 5328A FREQUENCY RESOLUTION N control to 10 KHz 102 Adjust Channel A trigger LEVEL until the Channel A triggering LED blinks 7 5 70 is selected to give a counter reading of 15 85 0 20 ms Refer to Table 5 2 for the range of values allowable for ASR70 Refer to Figure 5 13 for ASR70 component location NOTE Decreasing A5R70 to the next lower recommended value shown in Table 5 3 will decrease the sweep retrace time by approximately 0 15 ms Inversely increasing 70 to the next higher recommended value will increase the sweep retrace time by ap
51. 5 Ohms Adjustable AC Line Transformer Select to cover line voltage used 100 120 volt General Radio WSMTB General Radio W10HM73 220 240 volt Line Voltage Monitor To be used with above Adjustable AC Line Transformers 120 volt Monitor 240 volt Monitor RCA 120B RCA WV 503A Frequency Accuracy lt 0 17 Calibration Increments lt 2 MHz Select to cover Frequency range of RF plug in 0 96 to 42 GHz 3 7 to 124 GHz Frequency Meters HP 536A HP 537A Adapter APC 7 to Type N m HP 11525A Amphenol 131 7018 Adapter APC 3 5 f to Type N m Delay Line Refer to Figure 1 3 Discriminator General Information Model 8350A Table 1 4 Recommended Test Equipment 4 of 4 Critical Specifications Recommended Model BK NE PC Board Extender RF Plug in Extender Cable Connector J2 RF Plug in Extender Cable Interface Connector J3 44 pin extends printed circuit boards Extends RF Plug in Interface Extends RF Plug in Power Supply HP Part Number 08350 60031 each HP Part Number 08350 60034 HP Part Number 08350 60035 IReferto the Recommended Test Equipment list in the Operating and Service Manual ofthe RF plug in used for a listing of equipment specifically relating to the RF plug in used Not all equipment included in this list is necessary for all RF plug ins 2P Performance Test
52. 59 Figure 8 30A Delete Figure 8 304 A341 PROM Assembly Schematic Diagram Page 8 75 Figure 8 43 1 of 2 Replace part of Block D SWEEP RAMP GENERATOR with P O Figure 8 43 1 of 2 AS Sweep Generator Schematic Diagram Block D Replacement from this manual supplement Replace part of Block D SWEEP RAMP GENERATOR with P O Figure 8 43 1 of 2 45 Sweep Generator Schematic Diagram Block D Replacement B from this manual supplement Delete ASTP17 in Block D Replace part of Block E SWEEP TRIGGER with P O Figure 8 43 1 of 2 A5 Sweep Generator Schematic Diagram Block E from this manual supplement Model 8350A KR ineo ANAL ZEA HEWLETY FACKARn 0mogo ecos 000G Amoo0ee ctc 0000008 Figure 19 87564 Scalar Network Analyzer INTERFACING THE 8350B WITH SPECIFIC MEASUREMENT EQUIPMENT 8756A SCALAR NETWORK ANALYZER The 8756A 15 used for scalar transmission and reflection measurements with 60 dB of dynamic range for ratio measurements and absolute power measurement from 50 dBm to 10 dBm The 8350B has the following features designed for use with the 8756A Scalar Network Analyzer RF Square wave Modulation By engaging the 1 MOD key an internally generated squarewave modulation of the RF output is available thus eliminating the need for external modulating equipment jumper internal to the 8350B enables the square wave modulation
53. A Adjustments T Troubleshooting 3Mauray Microwave Corp 8610 Helms Ave Cucamonga CA 91730 4General Radio 300 Baker Avenue Concord MA 01742 5RCA Distribution amp Special Products Div Dept EM New Holland Ave Lancaster PA 17604 SAmphenol North America Bunker Ramo Corp RF Operations 33 E Franklin St Danbury CT 06810 Two 44 pin printed circuit board extenders and a fuse kit are included with the Model 8350A Accessory Kit Supplied HP Part Number 08350 60020 Refer to Figure 1 1 in this manual 1 72 RECOMMENDED TEST EQUIPMENT 1 73 Equipment required for testing and adjust ment of the instrument is listed in Table 1 4 Other equipment may be substituted if it meets or exceeds the critical specifications indicated in the table 1 74 HEWLETT PACKARD INTERFACE BUS 1 1 75 Model 8350A is factory equipped with a remote programming interface using the Hewlett Packard Interface Bus HP IB This provides a remote operator with the same control of the instrument available to a manual local operator Remote control is maintained by a system controller desktop computer computer etc that sends commands or instructions to and receives data from the Model 8350A using the IB The HP IB is Hewlett Packards implemen tation of the IEEE Standard 488 1978 A complete general description of the HP IB is provided inthe manual entitled Condensed Description of the Hewlett Packard Interface
54. Bus HP Part Num ber 59401 90030 Model 8350A General Information i Power Splitter HP 11667A Adapter Type N Male to SMA Female 2 required 1250 1250 Delay Line gt 1 meter 3 feet in length SMA male 08350 20038 connectors Adapter BNC Female to Male SMA 1250 1200 Mixer Double Balanced to 12 GHz RHG Electronics Part No DM 1 12 0960 0451 1 to 18 GHz RHG Electronics Part No DM 1 18 None RHG Electronics Laboratories Inc Deer Park NY 11729 Adapter SMA Male to SMA Male 1250 1159 Figure 1 3 Delay Line Discriminator 1 15 1 16 Model 8350A Installation SECTION II INSTALLATION 2 1 INTRODUCTION 2 2 This section provides installation instruc tions for the Model 8350A Sweep Oscillator and its acccessories This section also includes infor mation about initial inspection and damage claims preparation for use and packaging storage and shipment 2 3 INITIAL INSPECTION 2 4 Inspect the shipping container for damage Ifthe shipping container or cushioning material is damaged it should be kept until the contents of the shipment have been checked for completeness and the instrument has been checked mechani cally and electrically The contents of the ship ment should be as shown in Figure 1 1 Pro cedures for checking electrical performance are given in Section IV Performance Tests of this manual If the instrument combination does not pass the electrical Performance Tests refer
55. ERE AT teases 50 dBm RESOLUTION BANDWIDTH 1 MHz FREQUENCY SPAN DIV 5 MHz FREQUENCY SPAN MODE FULL BAND VIDEO 8 Adjust as necessary FREQUENCY BAND Select to cover frequency in step 1 3 Press 8350 POWER LEVEL STEP SIZE 1 0 and dBm dB 4 Note the actual attenuation values on the calibrated step attenuator s Option 890 calibration report at the frequency and attenuation steps used Calculate the Reference Attenuator Error for each step as shown below Record this error in the test card Atten Error column Attenuation Error Cal Ref Atten Cal Step Atten Ref Setting Step Setting For example if the Reference setting is 70 dB the calculation for the 30 dB step setting would be as follows Example Calibration Report values 70 dB setting is actually 69 55 dB 30 dB setting is actually 30 80 dB Attenuation Error 69 55 dB 30 80 dB 70 dB 30 dB 125 dB NOTE The actual attenuation stepped in this example is 38 75 dB 69 55 dB 30 80 dB 5 Adjust spectrum analyzer TUNING control to center notch on sweep oscillator output signal Reduce spectrum analyzer FREQUENCY SPAN DIV to 0 2 MHz and recenter TUNING control Press FREQUENCY SPAN MODE ZERO SPAN key and adjust FINE TUNING to peak signal on spectrum analyzer display Adjust spectrum analyzer REFERENCE LEVEL VERNIER
56. Manual of the specific RF plug in used for detailed information on the configuration switch 2 24 Interconnections 2 25 Therearetwo RF plug in interconnections on the Model8350A Sweep Oscillator mainframe These are the RF Plug in Interface Connector J2 and the Power Supply Interface Connector J3 J2 and J3 are visible at the rear of the RF plug in channel complete listing of pins and the associated signals and voltages for these con nectors are listed on the overall instrument Wiring List in Section VIII Service of this manual 2 26 Mating Connectors 2 271 Allofthe externally mounted connectors on the Model 8350A are listed in Table 2 4 Opposite each mainframe connector is an in dustry identification the HP part number of a mating connector and the part number of an alternate source for the mating connector For HP part numbers of the externally mounted con nectors themselves refer to Section VI Replace able Parts of this manual Model 8350A 2 28 HP IB Interface Connector and Cables 2 29 The HP IB Interface Connector J4 located on the rear panel of the Model 8350A allows the sweep oscillator to be connected to any other device on the HP IB Interface Bus A complete illustra tion ofpin configuration and signals on the HP IB Interface connector is given in Figure 2 5 2 30 All instruments on the HP IB Interface Bus are interconnected by HP IB Interface Cables A list of the available HP IB Inter
57. Operating Information 3 56 The decimal equivalent of the talk listen address will be displayed in the FREQUENCY TIME display Refer to Table 3 5 for interpre tation ofthe equivalent decimal value into separate talk and listen address characters To change the address refer to Figure 3 7 Instrument State for further information 3 57 Receiving The Data Message 3 58 The 8350A accepts program codes that contain information for programming all of the front panel and special HP IB only functions except the LINE switch The 8350A will respond to the Data message when in remote and addressed to listen 3 59 Input Syntax The 8350A responds to program codes in a Data message in the order in which they are received Each function is pro grammed with a string of ASCII coded characters that follow one of the following sequences Function Code Numeric Value Units Terminator EOS Function Code Numeric Value EOS Function Code EOS 3 60 Function Codes Function codes are typically 2 to 4 character mnemonics For func tions that have a numeric value associated with it passing the function code only will enable and activate the function for further data entry 3 61 Numeric Value These are either a single decimal digit a set of 14 characters or less representing a number or a string of binary bytes If the numeric value is a single digit 0 through 9 it represents a storage register A string of 14 charac
58. PINMI Low Plug in Nonmaskable Interrupt signal onto the microprocessor nonmaskable interrupt control input L NMI Low Nonmaskable Interrupt L PINMI and L are reserved for future use and are not used at this time When addressed by the microprocessor interface the following control lines onto the microprocessor data bus Interrupt Requests L RTCIRQ Low Retrace Interrupt Request L Low Plug in Interrupt Request and L IBIRQ Low HP IB Interrupt Request Flags L PIFLG Low Plug in Flag and L MFLG Low Marker Flag Power Supply Status L PSF Low Power Supply Failure and L PST Low Air Flow Failure TEST Low Test When active TP20 jumpered to ground initiates Front Panel Bus self test Used if keyboard is not operational Interrupt Logic Quad Schmitt Trigger NAND gate U34 ORs several interrupt requests onto the microprocessor interrupt request control input L IRQ An active low microprocessor interrupt request L IRQ is generaied any one of the interrupt request inputs to U34 is active low If the microprocessor is enabled to accept interrupts the microprocessor completes the instruction it is executing then jumps to the Interrupt Service Routine stored in ROM The interrupt requests may be disabled by grounding TP21 IRQE High Interrupt Request Enable This forces the U34C output L IRQ high not active regardless of the state of the interrupt requests L PI
59. Size Sweep Time Save Register external Sweep Take Sweep Internal Sweep Trigger Line Sweep Trigger External Sweep Trigger Single Sweep Step Up Increment CW Vernier Acceptable Numeric Data Program codes of the form XXm use m to turn the function On or Off 1 or 0 For the storage register functions the n is 1 through 9 The 8350 ignores spaces plus signs negative signs except when valid and any unexpected characters Program codes can be upper or lower case alpha characters Model 8350A to send the message by the Service Request Mask RM function Error in syntax Parameter value modified to default value Hardware failure End of sweep 3 89 The 8350A can send a Require Service message in either the local or remote mode Further information pertaining to the instrument state can be obtained by conducting a Serial Poll or by executing the Output Status function both of which access Status Byte information The RQS state and the bus SRQ line are cleared only by executing a Serial Poll 3 90 Sending The Status Byte Message 3 91 After receiving a Serial Poll Enable com mand SPE and when addressed to talk the 8350A responds by sending its Status Byte mes sage as indicated in Table3 8 A second status byte is available but must be accessed via the Output Status function When the seventh most signifi cant bit bit 6 Request Service of the Status Byt
60. Start Frequency Stop Frequency Continuous Wave Swept CW Range and Resolution e 5 Range See plug in Resolution Center 0 24 of band Delta Frequency B Range 05 of plug in Vernier X X X Resolution 0008 of band 1 Values must end with terminator GHz or MHz REMOTE FUNCTION PROCEDURES Program Code START STOP CW GZ Swept CW SH CW MZ KZ HZ Center Frequency EM CF AF Delta Frequency EX CF DF 1 Depends on plug in used if lt 2 GHz in 83525 or 83522 Figure 3 6 Frequency Sweep Mode 3 of 3 23 Operating Information Model 8350A INSTRUMENT STATE DESCRIPTION This function block contains two LEDs one that indicates whether Sweep Oscillator is in the remote mode and another indictates when it is addressed to talk or listen The local key when not in local lockout will switch the Sweep Oscillator from remote to local front panel control The Instrument Preset key when engaged will first run the Sweep Oscillator self test then set the controls to the preset condition PANEL LAYOUT INSTRUMENT STATE REM ADRS D 2 INSTR 9 FUNCTIONS INDICATORS LCL Returns Sweep Oscillator control to front panel from remote operation unless a Local Lockout has been executed Th
61. The frequency marker value is unchanged the previous center frequency value is lost Figure 3 8 Frequency Markers Sweep Time Marker Transfer 1 of 4 Model 8350A Model 8350A Marker Sweep This function temporarily uses the values of Markers 1 and 2 and reassigns them to the Start and Stop frequencies respectively The previous values of the Start and Stop frequencies are saved and reassigned when exiting Marker Sweep mode If Marker 1 is greater than Marker2 or M2 less than M1 the lower frequency is used for the Start frequency and the higher value for the Stop frequency Note that the values of Markers 1 and 2 and hence the temporary Start and Stop frequency values can be modified in marker sweep mode by using either the start or the stop controls or M1 or M2 controls The new values of M1 and M2 are retained upon exiting Marker Sweep mode Marker 1 to Start Marker 2 to Stop This functions the same as marker sweep except that the Start and Stop frequencies are permanently reassigned and not restorable to their previous values Counter Interface Enable and Disable When Sweep Oscillator is used in swept mode this function enables the use of the 5343A Microwave Frequency Counter to count Start Stop or Marker frequencies LIMITATIONS CONCERNS 1 Allfrequency markers are initialized to the value of the center frequency of the frequency range of the plug in at power on Frequency markers if active and the pres
62. an external power meter or detector CRYSTAL MARKERS 83522A 83525A Plug ins only 50 10 and 1 MHz crystal frequency marker combs are available The 50 and 10 MHz are available at frequencies less than 2 GHz while the 1 MHz markers are available under 1 GHz 0 AMPTD INTENS The markers can be set to be amplitude dips on the RF output and or i intensified spots on the Z axis of the CRT or both They are independent of the mainframe markers EXT External Marker Anexternal frequency marker can be input through the rear panel ofthe plug in The marker appears when the RF output frequency equals the marker frequency The external marker input power should be between 10 dBm and 10 dBm MKR Lamp When the 8350A is in CW or manual external sweep mode the MKR Lamp will light when the CW frequency is at a marker frequency Useful when an accurate CW frequency reference is desired and to calibrate plug ins RF OUTPUT CONNECTOR Type N female The 83570A 18 to 26 5 GHz Plug in is equipped with a WR 42 waveguide output connector Figure 7 Plug in Controls 2 of 2 14 Model 8350A Local Operation E e Figure 8 Frequency Response Test Set INTERFACING THE 8350A WITH SPECIFIC MEASUREMENT EQUIPMENT 87555 FREQUENCY RESPONSE TEST SET The 8755S consist of 8755C Swept Amplitude Analyzer 182T Oscilloscope 11664A Detectors 3 each 8750 Storage Normalizer The 8755 is used for scal
63. and to allow the RF plug in to be removed easier The plastic feet provide clearance for air circulation and make the instrument self aligning when stacked on other Hewlett Packard full rack width modular instruments The instrument is packaged at the factory with two shipping bars attached to the front sides refer to Figure 2 12 the 1nstru ment does not include front handle or rack mount options replace the shipping bars with the self adhesive trim strips supplied with the instrument Model 8350A Installation PROGRAMMING CONNECTOR J13 as seen from rear panel Logic Levels Control of input lines can be accomplished by contact closure to ground for a logic low level and open circuit for a logic high level Low 0 8 Vdc High 22 4 Vdc 1 2 3 4 5 6 7 8 9 O O O O O O O O O O O O NO CONNECTION LOW MARKER PULSE LOW PENLIFT REQUEST ALTERNATE SWEEP 1 LOW STOP FORWARD SWEEP REQUEST 5 VOLTS 100 ma MAX LOW RF BLANK LOW RF BLANK REQUEST HIGH EXTERNAL TRIGGER SWEEP HIGH PENLIFT LOW PEN MUTE FOR X Y RECORDER NO CONNECTION NO CONNECTION LOW BLANKING PULSE 1 LOW MARKER REQUEST LOW RETRACE STROBE LOW ALTERNATE SWEEP ENABLE LOW STOP SWEEP REQUEST DIGITAL GROUND LOW BLANKING PULSE REQUEST LOW COUNTER TRIGGER L STPADV LOW STEP ADVANCE L PL LOW PENLIFT SYNC TRG HIGH SYNCHRONIZING TRIGGER NO CONNECTION Figure 2 7 Progr
64. auxiliary output of a multi band plug in such as the 83592A 0 01 20 GHz the frequency multiplier feature of the 5343A may be used so that the proper RF frequency is displayed Model 8350A e Model 8350A 8350A SWEEP 83500 5343A MICROWAVE OSCILLATOR SERIES PLUG IN FREQUENCY CONVERTER CNTR TRIG SWP INTFC A coo gl o aon STOP SWEEP SWP INTFC 500 onan COUPLED DIRECTIONAL COUPLER Figure 15 53434 Test Setup Notes on connections power splitter or directional coupler may be used as long as the input to the 5343A does not exceed 7 dBm or go below the minimum sensitivity CNTR TRIG Counter Trigger Output for controlling the HP 5343A Microwave Frequency Counter This allows a frequency count of the selected marker START or STOP frequency of the present sweep Connects to the SWP INTFC A sweep interface on the rear panel of the 5343A to externally trigger the counter STOP SWEEP Input for stopping the progress of the forward sweep When connected to the SWP INTFC B sweep interface on the rear panel of the 5343A the 5343A stops the sweep long enough for the counter to gate and measure the selected frequency marker START or STOP frequency If the internal modulation on the 8350A is on it is momentarily disabled so that the counter may measure the frequency To measure a START STOP or marker frequency during a
65. commun icate with the interrupting device Clock Generation The Clock Generation circuit produces five timing signals for use on the A3 Microprocessor assembly Phase 1 01 and Phase 2 0 outputs are a two phase clock signal for microprocessor US The I O Strobe IOS output is used for timing of most I O Input Output operations The Address Valid Strobe AVS indicates when the microprocessor address lines are valid for decoding The microprocessor will place data on the data lines after receiving the rising edge of the Data Bus Enable DBE signal Figure 8 27 see A3 schematic foldout shows the timing relationship of these signals and their relationship to activity on the microprocessor address and data lines data bus activity is shown for both a read and write operation Clock Oscillator Crystal and logic gates U21A U21C and U21D form a crystal oscillator with two feedback loops The basic oscillator is comprised of U21C and RC phase shifters RI CS and R2 C6 This circuit oscillates at approximately the crystal resonant frequency of 10 7 MHz At the oscillation frequency the two RC phase shifters provide enough phase shift to ensure a total loop phase shift of about 360 degrees Logic gates U21A and U2ID provide bias and stabilization Logic gate U21B inverts and buffers the oscillator output to the Clock Generator circuit Clock Generator Latch 016 and 32 by 8 PROM 1012 form a small state machine that genera
66. control knob resolution 0 00038 of band 262 144 points across band press SHIFT DF To return to coarse control knob resolution press SHIFT CF Insert after FREQUENCY OFFSET description Display Multiplier Modifies front panel display only This feature allows the FREQUENCY LED displays to show the final RF output when frequency multiplier is used The FREQUENCY TIME display not pictured above contains the selected multiplication factor Allowable multiplication factors are 1 to 99 integers only Display Offset Modifies front panel display only This feature allows the FREQUENCY LED displays to show the final RF output when a frequency up converter is used The FREQUENCY TIME display not pictured above contains the selected offset value Allowable offset values 0 to 999 GHz Model 8350A Page 11 Figure 5 Insert after the SAVEn RECALLn description SAVE REGISTER LOCK SAVE registers may be write protected locked by pressing SHIFT SAVEn This command makes it impossible to change the contents of any register until it is unlocked by pressing SHIFT RECALLn Since the 8350A memory is non volatile when equipped with Retrofit Kit 08350 60099 the contents of SAVE registers and the locked unlocked status are retained even with line power off If a SAVEn command is attempted after SAVE LOCK is engaged an Error 30 E030 is displayed Pages 31 32 and 33 Insert pages 7 through 9 of this man
67. control the 8350B and RF Plug in Microprocessor US is the main element in this circuit which utilizes the following signals to execute the program stored in ROM Address Lines 0 15 The microprocessor outputs sixteen address lines that specify an address location between hexadecimal 0000 and FFFF for the source or destination of any data transfer Unless instructed to do otherwise the microprocessor automatically increments the address location after each read or write operation Data Lines 00 07 The eight data lines are bi directional and are used by the microprocessor to communicate with the address location specified by the address bus 6 L WRITE Line The microprocessor L WRITE Low Write output controls the direction of the data transfer on the data bus A logic high read indicates a data transfer from the addressed device to the micro processor A logic low write indicates a data transfer from the micro processor to the addressed device The Valid Memory Address output indicates when the Address Bus has a stable and valid address for a data transfer Address lines A0 A9 all data lines and the L WRITE line all use pull up resistors U6 U13 and R21 to pull their high logic levels to 3 6 4 This ensures that the logic levels on these lines does not exceed the supply voltage of the CMOS RAM A low PWON input at TP23 resets microprocessor US at initial power on
68. displayed is lower than 1 GHz the start frequency must be changed to 1 Set oscilloscope to vs B and MAG X10 mode NOTE To use the frequency meters for swept and marker frequency accuracy first calibrate the frequency meters Calibrate meters by using the frequency counter to set the 8350A swept CW frequency to each frequency listed on the test card steps 8 9 10 12 and 13 then connect the oscilloscope and adjust the frequency meter to dip trace Record difference between actual and frequency meter reading 8A Adjust frequency meterto move notch on oscilloscope to start frequency Check and record corrected Frequency Meter reading on test card step 8A 9A Adjust frequency meter to move notch on oscilloscope to Stop Frequency Check and record corrected Frequency Meter reading on test card Step 9 10A For multiband plug ins repeatsteps8 and 9 using the start and stop frequencies on test card step 10A 12A Set the 8350A frequency markers to the frequencies listed on the test card Adjust the frequency meter notch over each marker and record the corrected frequency meter reading on the test card step 12 13A For multiband plug ins set the start and stop frequencies on the test card step 13 and repeat the previous step with the markers set as shown on the test card step 13 4 14 OUTPUT AMPLITUDE TEST SPECIFICATION See Performance Test Record Card in section IV of the appropriate plug in manual
69. for a trace at the center gradicule line Press 1 dB DIV and recenter trace 6 Press the 8350A key and decrease the reference attenuation by 10 dB 7 Record the power level variation from the center graticule reference on the spectrum analyzer display be sure to designate the direction of the change is above and is below the reference 8 Algebraically add the Attenuation Error and Deviation from 0 reference and record the sum on the test record card Repeat steps 6 and 7 for the other attenuation values 4 31 4 32 ud musa SE Model 8350A Adjustments SECTION V ADJUSTMENTS 5 1 INTRODUCTION 5 2 This section provides adjustment proce dures for the Model 8350A Sweep Oscillator These procedures should not be performed as routine maintenance but should be used 1 after replacement of a part or component or 2 when performance tests show that the specifications of Table 1 1 cannot be met Table 5 1 lists all of the adjustments by reference designation adjustment name adjustment paragraph performance test paragraph and description Each procedure includes a test setup illustration and one or more adjustment location illustrations NOTE Allow the 8350A Sweep Oscillator to warm up for 30 minutes prior to making any adjustments 5 3 SAFETY CONSIDERATIONS 5 4 Although this instrument has been designed in accordance with international safety standards this manual cont
70. for the test It is included to make the test convenient Sweep HP 8350A Spectrum Analyzer 8565 Modulation HP 8901A 20 dB HP 8491B Option 020 PROCEDURE 1 Connect equipment as shown in Figure 4 7 2 Press 8350A Enter frequency shown on test card step 2 NOTE To minimize drift allow 5 minutes before continuing with test KEPT 4 15 Daaa SSSAAA Eo Model 8350A Performance Tests PERFORMANCE TESTS 4 16 RESIDUAL FM TEST Cont d 3 Tunespectrum analyzer to CW frequency set for plug in Set spectrum analyzer resolution bandwidth to 10 kHz and frequency span per division to 10 kHz while keeping signal centered on CRT display Auto stabilizer should be on 4 Select spectrum analyzer linear LIN amplitude scale and adjust reference level controls for a full eight division vertical display Set scan time per division to 20 msec 5 Setspectrum analyzer sweep trigger to single sweep Set persistance control fully clockwise and erase the trace Push spectrum analyzer start reset pushbutton five times within a two second interval and store resultant traces on CRT screen Display should be similar to that shown in
71. frequency to be changed to KHz see section 5 of the Operating and Service manual for details Alternate Sweep Function Thc ALTn function of the 8350B allows two different fre quency and power settings to be swept on successive sweeps The front panel setting and the setting stored in a memory register location n n l 9 can be selected for alternate sweeps See Figure 20 for a sweep display of the ALTn function when used with a bandpass response at different resolutions and offsets Model 8350A Figure 20 Alternate Sweep Function Display Some other features enhancing the convenience and versatility of the 8750 are Marker A The A function reduces the trace intensity between the Active and the previously Active Markers Power Sweep The RF output power may be ramped up when the sweeper is 1n the swept or swept CW mode by using the POWER SWEEP function See Figure 21 for a gain com pression display using power sweep Save and Recall This function allows the storage and recall of nine complete instrument settings GAIN dB 8 10 12 14 16 18 20 OWER IN dBm D Figure 21 Gain Compression Display Figure 22 outlines the general procedure used in making a scalar transmission and reflec tion measurement The 11692D Dual Directional Coupler is used in the example but if an 11666A Reflectometer Bridge a 85020A B or a 85021 A B Directional Bridge is available it may be used instead of the Cou
72. greater or less than 10 dB or may not change at all The 8350A CW control when being rotated may generate some noise spikes spurious signal is found that appears out of specifications check the fundamental signal amplitude to ensure it is at maximum specified power Then check spurious level by subsituting a known amplitude signal on the spectrum analyzer 3 Adjust the 8350A CW control through the entire range of the RF plug in and check for harmonic and non harmonic spurious signals The specifications for harmonic and non harmonic signals are on the performance test record card step 3 4 Change the spectrum analyzer to each of the next higher frequency bands and repeatithe previous step 4 18 OUTPUT VSWR TEST SPECIFICATION See Performance Test Record Card in section IV of plug in manual for output VSWR specifications DESCRIPTION The RF Output signal is measured using a directional coupler crystal detector and oscilloscope The signal at the oscilloscope contains 1 the incident signal from the oscillator and 2 the reflected signal The reflected signal is developed as follows The incident signal travels down the 20 cm air lines 2 to 18 GHz or 3 to 6 metres of coaxial cable 01 to 2 GHz encounters the open end and is reflected back to the source If the reflected signal at the RF OUTPUT connector encounters a perfect 50 ohm source match no signal is reflected back However the greater the mismatch the gr
73. has been entered REMOTE FUNCTION PROCEDURE Register 109 Store Current Register Resets Stored Register Successive Sweep Selected and Current ALTERNATE Alternate Off Figure 3 9 Storage Registers 2 of 2 31 Operating Information Model 8350A 32 SWEEP SWEEP TRIGGER DESCRIPTION This function Block contains seven keys for control of sweep source and time This block also hasa SWP LED to indicate sweep in progress The SWEEP type keys enable selection of EXT MAN or TIME sweep controls The SWEEP TRIGGER keys enable selection of INTernal LINE EXTernal and SINGLE sources of sweep triggering Lights on keys indicate active function PANEL LAYOUT TRIGGER SWEEP TRIGGER aa SWEEP gt GOO Le GOO 9 FUNCTIONS INDICATORS SWEEP EXTERNAL Enables sweep input via front or rear panel SWP input BNC SWP INPUT 0 to 10 volts to externally tune plug in oscillator SWEEP MANUAL Enable manual control of sweep voltage via frequency inputs Manual frequency is displayed on FREQUENCY TIME display SWEEP TIME Enables internally timed sweep The triggering for TIME may be one of the following sweep trigger modes INT Enables internal sweep triggering free run auto LINE Enables triggering by power line frequency SWEEP TRIGGER EXT Enables external triggering of sweep via rear panel auxiliary connector pin 9 A two volt trigger 20 volts m
74. number 0 9 or the letters through since these are interpreted as possible Micro Learn String data characters Itis suggested that the user exit this mode by using the 0 code as the mode terminator then restore the numeric displays via the CW ST and PL function codes OUTPUT MODE STRING A string of 25 bytes of binary data that describes all of the presently active functions of the 8350A and 83500 Series Plug in This information is not packed thus allowing simple data analysis The information passed indicates only which functions are presently active functions with no numeric values included By determining the decimal value of each byte the user can determine which function is active To determine the actual numeric value of some functions use the Output Interrogated Parameter function The length of the Mode String is fixed independent of the functions selected and the plug in used OUTPUT INTERROGATED PARAMETER The 8350A outputs the present numeric value of the instructed parameter that is to be interrogated Any parameter that has a numeric value associated with it such as Start Frequency Sweep Time etc can be interrrogated The units of the output data are Hz dBm dB or sec implied with the function selected OUTPUT ACTIVE PARAMETER The 8350A outputs the numeric value of the parameter that is presently active ie enabled for value modification from the step keys or data entry The units of the o
75. or power Holding a number key down causes it to repeat Example To enter a START frequency of 1 870 GHz 8 7 GHz sec to enter the equivalent frequency in MHz Backspace Key BK SP Prior to pressing a units key the value entered from the keyboard may be changed via the BK SP key without effecting the current instrument state The backspace key allows the user to alter digits already entered Step UP and Step DOWN keys These keys increment or decrement the active parameter including memory registers by the STEP SIZE or preset amount By holding either key down the 8350A will continue to step Figure 2 Data Entry 1 of 2 Model 8350A Local Operation therefore eliminating the need for the user to repeatedly press the step keys The STEP UP function may be engaged via the remote STEP UP ADVANCE on the rear panel Programming Connector The STEP UP ADVANCE is incremented by supplying contact closure to ground or logical 0 to pin 22 STEP SIZE This key is used to enter a frequency or power increment to be used with the UP or DOWN key The STEP SIZE key is pressed before the quantity is entered A frequency step that is entered is common for START STOP CF CW AF VERNIER OFFSET MARKER and MANUAL SWEEP parameters power step is used for varying POWER LEVEL POWER SWEEP and SLOPE Default values are assigned at power on and instrument preset for step sizes until new values are entered Note
76. output connector allows interface with other HP IB instrument or controllers POS Z BLANK output connector provides positive 5V retrace and bandswitch blanking and nega tive intensity Marker Z axis Modulation signals for external display CNTR TRIG Counter trigger output connector when used with STOP SWEEP with appropriate frequency counter SWP INTFC B to stop the for ward sweep long enough to take a frequency count NEG Z BLANK output connector provides retrace 5 and bandswitch blanking Z axis modulation signals for external displays PEN LIFT output connector provides an open col lector output to the remote penlift coil of an X Y recorder SWEEP OUT IN connector parallels front panel SWEEP OUT IN connector Provides and accepts sweep signal FM INPUT connector passes signal thru to plug in for frequency modulation or phase lock error signal inputs PROGRAMMING CONNECTOR provides digital control of external display functions and sweeper control in Description in out Logic Marker Pulses output TTL Pen Lift Request input Sweep Alternate output TTL Stop Fwd Swp Req input TIL 5 volts output TTL 100 ma Max 7 RF Blanking output TTL 8 RF Blank Request input TIL 9 Ext Trig Input input 10 Pen Lift output 11 Recorder Mute output 12 13 14 Blanking Pulse output 15 Marker Request input 16 Retrace output 17 Alternate Swp En output 18 Stop Swp Request input
77. percent of full band Can be used to drive the X axis on a CRT or X Y recorder SWP Sweep INPUT Used when in EXT SWEEP mode Supplying a dc voltage will tune RF where 0 volts tunes to the lower frequency of the set sweep and 10 volts tunes to the upper frequency The input can be a ramp for a swept output or DC for a CW frequency The display and RF blanking must be off when externally sweeping Figure 6 Display Function Keys Model 8350A Local Operation 05 76808 998 83500 SERIES PLUG IN Power Control POWER LEVEL When pressed the plug in display indicates the RF output power The output power may be varied using the POWER control keyboard or step size keys Note thatthe internal leveling must be on and the unleveled light out for calibrated output power The power is typically calibrated over a 15 dB range 80 dB with plug in Option 002 Step Attenuator SLOPE Compensates for high frequency power losses in external RF cables by increasing the power at higher frequencies This compensation provides a flat RF signal output at the end of a cable or test set Press SLOPE and the display will indicate the dB per GHz of the present sweep of compensation desired Use the POWER control keyboard or step keys to enter the amount of slope Press SLOPE again to remove all compensation POWER SWEEP This function enables the output power to be swept up Th
78. printout rint CW prt PRINT Cy CW frequency CF and AF TIME LEDS on 10 second sweeptime Switch to CF AF Change sweep time to 10 seconds QUTPUT 719 CFST10SsC Remote lamp out Switch to local 1 Typical Statements for the HP 9825 Series Desktop Computer 2 Typical Statements for the HP 9835 9845 and 85 Series Desktop Computers LOCAL 719 Figure 3 4 Remote Operator s Check Model 8350A 3 19 REMOTE OPERATION HEWLETT PACKARD INTERFACE BUS 3 20 The 8350A Sweep Oscillator can be oper ated remotely via the Hewlett Packard Interface Bus HP IB Bus compatibility programming capability and data formats are described in the following paragraphs For complete information on specific program code syntax functions limits etc please see Functional Block Index Table 3 2 3 21 front panel functions except for the LINE switch and Set HP IB Address are program mable through the HP IB Also provided are special HP IB only functions to aid the programmer Coinplete descriptions of all HP IB programmable functions are contained within the functional blocks 3 22 Toverify thatthe Sweep Oscillator s HP IB interface is functional a quick check is provided in Figure 3 4 Remote Operators Check This tests that the 8350A can respond and send to the controller the fundamental HP IB bus messages The following information gives a general de Operat
79. rear panel PROGRAM MING CONNECTOR Furnished 2 29m 7 5 foot power cable with NEMA plug Operating Temperature Range 0 C to 55 C Power 100 120 220 or 240 volts 5 10 50 to 60 Hz Option 400 60 to 400 Hz Approximately 270 volt amps including RF plug in unit depends upon specific RF plug in unit used Weight not including RF plug in unit Net 16 5 kg 36 4 1b Shipping 22 7 kg 50 Ib Dimensions 425 W 133 3 422 mm D 16 75 x 525x 16 6 in General Information 1 7 SPECIFICATIONS 1 8 Listed in Table 1 1 are the specifications for the Model 8350A Sweep Oscillator These speci fications are the performance standards or limits against which the instrument may be tested Only the specifications for the Model 8350A Sweep Oscillator mainframe are given in this manual Refer to the Operating and Service Manual for the specific RF plug in used for complete specifi cations relating to the RF plug in Table 1 2 lists the sweep oscillator supplemental characteristics Supplemental characteristics are not specifica tions but are typical characteristics included as additional information for the user 1 9 SAFETY CONSIDERATIONS 1 10 General 1 11 This product and related documentation must be reviewed for familiarization with safety markings and instructions before operation This product has been manufactured and tested in accordance with international safety standards 1 12 Safety Symbols
80. sections of the manual which should be kept with the instrument for use by the instrument operator 1 5 On the front cover of this manual is a Microfiche part number This number may be used to order 10 by 15 centimeter 4 by 6 inch microfilm transparencies of the Manual Each microfiche contains up to 60 photo duplicates of the manual pages The microfiche package also includes the latest Manual Changes sheet as well as all pertinent Service Notes 1 6 Refer any questions regarding this manual the Manual Changes sheet or the instrument to the nearest HP Sales Service Office Always identify the instrument by model number com plete name and complete serial number in all correspondence Refer to the inside rear cover of this manual for a worldwide listing of HP Sales Service Offices 1 1 General Information 1 2 Model 8350A Table 1 1 Model 8350A Specifications 1 of 2 SPECIFICATIONS 8350A SWEEP OSCILLATOR with RF Plug in installed FREQUENCY CONTROL FUNCTIONS Range Determined by RF plug in unit used Linearity Refer to RF plug in unit specifications START STOP Sweeps Sweeps up from the START frequency to the STOP frequency Range START and STOP parameters are inde pendent fully calibrated and continuously adjustable over the entire frequency range STOP frequency must be greater than or equal to START frequency CF AF Sweep Sweeps symmetricall
81. state A listing of pin configuration and signals on the Programming Connector is given in Figure 2 7 Output signals on the Programming Connector supplement other rear panel output signals such as display and RF blanking X Y recorder penlift and HP Model 8410B and HP Model 5343A interface signals Input signals on the Programming Con nector affect the sweep status display and RF blanking penlift outputs etc 1 8 Model 8350A 1 43 To have a complete operating unit the Model 8350A Sweep Oscillator must be used in conjunction with an RF plug in unit which operates in the desired frequency range The HP Model 83500 Series RF Plug in units havc bcen specifically designed for use with the Model 8350A With the addition of the Model11869A RF Plug in Adapter the HP Model 86200 Series RF Plug ins may also be used with the Model 8350A 1 44 OPTIONS 1 45 Option 001 Nonvolatile Memory 1 46 Option 001 instruments contain a battery pack inserted in the battery holder with a battery hold down clamp and a special A3 Micro processor board With Option 001 installed the Model 8350A has a nonvolatile memory which retains the contents of all instrument state storage registers the current instrument state and the HP IB address When fully charged the batteries will retain a sufficient charge to hold the memory contents for approximately 20 days The batteries are charged within the instrument and a full charge is maintained when
82. that a step size cannot be for sweep time The keyboard and step keys affect the last active function The entered Step Size is not displayed Example To set a 250 MHz step size Press STEP SIZE 2 5 0 MHz ms After this each time the UP or DN key is pressed the active frequency parameter will change by 250 MHz SHIFT key BLUE This key is used to activate the functions coded in blue and some special functions Thelamp in the center of this key is on when the key is active Example Press M2 M3 M4 5 MARKERS ALL OFF Pressing SHIFT OFF turns off all markers The SHIFT key is also used to set the HP IB address Press SHIFT LCL the FREQUENCY TIME display will indicate the present HP IB address number The address may be changed to any value between 0 and 30 by using the keyboard to enter a number and GHz MHz or dBm key as a terminator The 8350A is factory preset for an HP IB address of 19 NOTE Address number 21 is normally reserved for calculator addressing and HP 1B interface functions and should not be used Figure 2 Data Entry 2 of 2 Local Operation Model 8350A G68 v Be 1 0005 9 GO FREQUENCY This section controls the sweep mode and frequency limits START STOP When either the START or STOP key is pressed the sweep oscillator is put in START STOP mode Swept RF output
83. the Remote Control connector of the X Y recorder Fora complete pin assignment listing refer to the Operating Manual for the particular X Y recorder being used Pen lift pin location on X Y recorders 7010B 7015B 3 7035B 18 7004 7034 18 7044 45 47 1 7046 34 21 Local Operation 27 Figure 14 5343A Microwave Frequency Counter 5343A FREQUENCY COUNTER The 5343A Microwave Frequency Counter can be used with the 8350A to measure frequencies in swept mode in addition to normal CW frequency measurements During swept operation the 5343A will stop the 8350A sweep and count a selected frequency parameter such as the START frequency STOP frequency or any frequency markers in the sweep range To accomplish this the 8350A and 5343A communicate via two signal lines Counter Trigger Stop Sweep on the 8350A and Sweep Interface A and B on the 5343A that enable the 8350A to externally trigger the 5343A and then allow the 5343A to stop the sweep long enough to gate and count the selected frequency parameter See Figure 15 for the test set up Measuring CW frequencies When measuring CW frequencies the CNTR TRIG and STOP SWEEP connections are not necessary The 5343A should be in the AUTO mode and the internal square wave modulation on the 8350A must be off Auxiliary Output The auxiliary output of an RF Plug in if available may be used with the 5343A When using the
84. these control lines with definition and function description All lines associated with the Instrument Bus except I OE3 are reverse terminated by 100 ohm resistors to reduce ringing Table 8 20 Instrument Bus Control Signals Line Master Data enable pulse for Instrument Bus Enable line for AS Sweep Generator and A8 HP IB Interface I OE3 I O Enable 3 Enable line for A4 Scaling and Marker PIROME Plug in ROM Enable Enable line for RF Plug in ROM TROUBLESHOOTING Since the A3 Microprocessor controls all functions in the 8350B a component failure on this board assembly generally disables the entire instrument The most likely indications of an A3 Microprocessor component failure are as follows Instrument Preset self test failure Error codes E015 through E006 Front Panel Lock up Some or all the front panel lights are on push buttons produce no response Flashing Lights Front panel lights flash in a random or periodic fashion pushbuttons will not function properly but may have an effect Partial Failure The instrument works most of the time but certain front panel functions do not work Instrument Preset Self Test Begin troubleshooting by initiating the Instrument Preset self test and checking the four LEDs mounted on top of the A3 Microprocessor for an error code When INSTR PRESET is pressed or when ac line power is initially turned on the four LEDs should m
85. to Section V Adjustments of this manual If after the adjustments have been made the instrument combination still fails to meet specifications refer to Section V Adjustments of the Operating and Service Manual for the RF plug in being used Ifa circuit malfunction is suspected refer to trouble shooting procedures in Section VIII Service of this or the RF plug in manual If the instrument does not pass the above electrical tests if the shipment contents are incomplete or if there is mechanical damage or defect notify the nearest Hewlett Packard office If the shipping container is damaged or if the cushioning material shows signs of stress notify the carrier as well as the Hewlett Packard office Keep the shipping materials for carrier s inspection The HP office will arrange for repair or replacement without waiting for claim settlement 2 5 PREPARATION FOR USE 2 6 Power Requirements 2 7 Model 8350A Sweep Oscillator requires a power source of 100 120 220 or 240 Vac 5 to 10 50 to 60 Hz single phase 50 to 400 Hz single phase for Option 400 instruments Power consumption is approximately 270 volt amps depending upon the specific RF plug in unit used 2 8 Line Voltage and Fuse Selection 2 9 Figure 2 1 illustrates the line voltage selec tion card and fuse location in the Power Line Module on the rear panel of the Model 8350A Select the line voltage and fuse as follows a Measure the ac li
86. will become operational When using the 8350A with an HP 8755C Swept Amplitude Analyzer channel 1 displays the current instrument state and channel 2 displays the stored setting provided the 8350A 8755C ALT SWP INTERFACE cable is connected Figure 5 Save n Recall n and ALT n Keys 11 Local Operation 8350 ace Ug mas FREQUENCY DISPLAY FUNCTIONS AMPTD MKR DISPL BLANK RF BLANK Function in effect when lamp in center of key is lit DISPL BLANK ON OFF Blanks the display during the retrace via the POS Z BLANK or NEG Z BLANK outputs RF BLANK ON OFF Blanks turns off the RF power during the retrace Lf 1IMOD ON OFF Activates the internal 27 8 KHz square wave amplitude modulation of the RF output This feature makes the 8350A directly compatible with the HP 8755 Frequency Response Test Set The 8350A may be modified via an internal jumper to provide 1000 Hz square wave amplitude modulation for instruments like the HP 415E SWR Meter refer to the Operating and Service Manual Section 5 SWP Sweep OUTPUT SWP Sweep INPUT BNC connection SWP Sweep OUTPUT Supplies a 0 to 10 Volt signal when 8350A is in MAN or TIME sweep mode OV output is at the start frequency of sweep 10V output is at the stop frequency of sweep In CW mode the output is a dc voltage proportional to the
87. 00 1 000 1 000 1 REFERENCE MAKRER M2 M3 MARKERS ON OFF MI 1 Off 0 COUNTER TRIGGER PARAMETER Start Freq Stop Freq Marker Freq SPECIAL CONDITIONS Non Swept CW On Off On 1 Off 0 Default Step Size On Off Vernier Negative Yes No Yes 1 No 0 Offset Negative Yes No Mkr A Mode On Off Mkr Sweep Mode On Off Counter Trigger On Off Alt Sweep On Off KEYBOARD ASSIGNMENT Start Stop 00000000 00000001 00000010 22250235 00000000 00000001 00000010 00000011 00000100 00000101 00000110 QN tA 50 CW CF AF Vernier Offset Markers Figure 3 17 HP IB Only Functions 6 of 7 Model 8350A Operating Information MODE STRING 2 of 2 Byte Bit Usage e 76543210 tme Dem 10 Cont d 00000111 Step Size 00001000 Sweep Time 00001001 Manual Sweep 00001010 Save Recall Alt 00001011 Hex Entry Address 00001 100 Hex Entry Data 00001101 Key Test 00001110 HP IB Address 01111111 None 01000000 Power Level 01000001 Power Sweep 01000010 130 Slope 11 00000000 ALTERNATE REGISTER 00000001 00000010 00000011 00000100 00000101 00000110 00000111 00001000 00001001 12 00000000 00000000 00000001 00000010 ALC Mode Int Ext Mtr POWER CONTROL CW Filter On Off On 1 Off 0 Power Sweep On Off POWER FUNCTIONS Slope On Off On 1 Off 0 Power Sweep On6Off CRYSTAL MARKER MODES Amplitude Mkr On Off On 1 Off 0 In
88. 10 MHz Crystal Detector Frequency Response 0 01 to 12 4 GHz Maximum Input Power 2100 mW Air Line Extension 2 required Impedance 50 Ohms Frequency Range dc to 12 4 GHz Reflection Coefficient 0 018 0 001 times the frequency in GHz RF Cable Impedance 50 Ohms Length 61 cm 24 in Step Attenuator Frequency Range dc to 12 4 GHz Incremental Attenuation 0 to 70 dB in 10 dB E Calibration Accuracy lt 0 1 dB at all steps HP 8478B HP 5343A HP 778D HP 779D HP 3400A HP 3312A HP 423B HP 11567A HP 11170B HP 8495A Option 890 Model 8350A Model 8350A General Information Attenuator Table 1 4 Recommended Test Equipment 3 of 4 Critical Specifications Recommended Model WM Attenuation 3 dB 0 5 dB HP 8491B Option 003 Frequency Range 0 01 to 12 44 GHz Maximum Input Power gt 20 dBm Attenuation 6 dB 0 5 dB Frequency Range 0 01 to 12 4 GHz Maximum Input Power gt 20 dBm Attenuator HP 8491B Option 006 Attenuation 10 0 5 dB Frequency Range 0 01 to 12 4 GHz Maximum Input Power 24 20 dBm Attenuator HP 8491B Option 010 Attenuation 20 0 5 dB Frequency Range 0 01 to 12 4 GHz Maximum Input Power 24 20 dBm Attenuator HP 8491B Option 020 Adjustable Short Maury Microwave 1953 2 Frequency Range 1 8 to 12 4 GHz Impedance 50 1
89. 151 2456 0160 2155 MJeEU gNSS 2 5 llieli zliEE 0160 2958 filefi z nES 0146 1192 ul4n nisz 19ni uuEt 1901 1950 1901 0050 1911 0050 T3 uod an Mani ort w EJ X ootav wo 9 5 5 3 3 aod Table 6 2 Replaceable Parts Description ASSEMBLY CaFaCITOF F E CrP aHCITOF F oD D CAPACITOR F D C PACITOP F D LT CaPACITOP F HCITOF F LHF ACITOF F IT CHP HCITOP F T CmPHCITOF F el CHPHCITOF F D CHPACITOR F D CePACITOP F CaFACITOF F DP CHFHCITOP F D CHPACITOP F rT CHPHCITOF F gt CAPACITOP F D CAPACITOPF F CAF ACTITOF F iD CAF HCITOF F P CeFHCITOR F gt D CHP eCITOF F D CHPRCITOF F D CHPHCITOP F D 0 ChFHCITOF F D CHPaCITOF F gt CAF ACITOF F T C4PaCITOR F D Te LIODE tUITCHII DIODE SHITCHIM DIODE ITCHI PIOPRE SUITCHII gnuF 75 10 1606 mL 75 11 L6UDC mL LAUDE Th OLUF 81 20 ZePF 5 Zno DC MICA Jerr S ZUIUDC HICH En z t E n 2 7 100 IC 21 20 Lune egPF 5 SNu DC HICA eSPF 200076 WICK 1916
90. 350A controls to SWEEP 100 sec SWEEP SINGLE Sweep START STOP full plug in range 8 Engage INPUT and STORE INPUT keys on storage normalizer Power Meter Leveling NOTE If plug in is multiband allow a small discontinuity typically 0 25 dB at the band switching point s listed on the test card step 9 9 Press 8350A SWEEP TRIGGER SINGLE key to start sweep while observing that the SWP light goes on Observe and record power meter peak to peak meter fluctuations on test record card step 9 Performance Tests Model 8350A PERFORMANCE TESTS 4 14 OUTPUT AMPLITUDE TEST Cont d 10 To store the observed trace in the 8750A SINGLE light off a trigger signal may be needed NOTE System irregularties can be checked by exchanging the thermistor and detector and sweeping again with the storage normalizer in INPUT MEM 11 Set the following controls Plug in ALC MODE RAYS RE Rr n a INT 8350A SWEEP uere 10 msec SWEEP TRIGGER INT SWEEP MODE eva SHIFT CW Storage Normalizer DISPLAY oct det edi em aede INPUT MEM Plug in Connect power meter to plug in OUTPUT turn off Adjust POWER LEVEL control until power meter reads the specified maximum leveled power Reconnect
91. 4 7 TEST RECORD 4 8 Results of the performance test may be tabulated on the Test Record Card at the end of Section IV in the Plug in manual The Test Record Card lists all of the tested specifications and their acceptable limits 4 9 TEST SEQUENCE 4 10 Table 4 2 lists the sequence of the perform ance tests and the major test equipment required for each test The performance tests should be performed in the order listed The performance test for crystal markers and other unique plug in functions are in the plug in manual 4 11 CALIBRATION CYCLE 4 12 The performance tests in this section should be performed in intervals of one year or less for the 8350A For plug in calibration cycle see respective plug in manual NOTE Plug ins with output frequencies greater than 12 4 GHz will require use of the Performance Test in the plug in manual Performance Tests Model 8350A Table 4 1 Operation Verification Program Using The 9825A B Desktop Computer heck Hands on err et red dme HP IB 4n idee AD Verification Ta in Line 3 If L COH hak e Line JB DPST Handshake or mability and i188 MS PST P red p Prosrammabilitw 8 ing 1 Jus 88 H1 AFRET ja RH Schar s3 Linse Read utmput s If Error stp or Read Error sate SH 1 8114 Errors vige RE
92. 5 U7 and U8 for slightly under 5 Vdc Also make sure that pin 1 of U13 or U6 is at approximately 3 6 Vdc Next the Clock Generation block should be checked The Clock Oscillator output TP27 should be a 1077 MHz square wave The AVS TP4 IOS TP10 and DBE lines are driven directly by U16 while the Phase 1 2 and Phase 2 TP1 lines are buffered by Clock Drivers Ql Q2 and Q4 These four clock signals run at approximately 973 kHz completing one cycle for every eleven cycles of the 10 7 MHz clock Typical waveforms can be found in the Circuit Description section Check the other control lines to the microprocessor In normal operation L RES pin 40 L HALT pin 2 L NMI pin 6 or TP8 and VCC pin 8 should all be at 5 0 Vdc If L NMI is low it can be forced back high by grounding 16 If the microprocessor then functions properly troubleshoot the interrupt circuitry In normal operation L IRQ will show periodic interrupts from the Front Panel at roughly 1370 Hz plus occasional End of Sweep interrupts E015 Microprocessor All of the Error Code LEDs turn on if the microprocessor cannot execute the first RAM Self Test This can be caused by one or more of several different failures These include malfunctioning of the microprocessor itself a failure in 1 2 Addresses C000 to FFFF con taining the Self Test software or its enable line or a failure in the Address or Data Busses In most cases the Free Run Test
93. 6 Specialty Connector 25 118 1 18 SWEEP OUT IN BNC 1250 0256 Speciality Connector rear panel 25 P118 1 J9 CNTR TRIG BNC 1250 0256 Specialty Connector 25 P118 1 J10 STOP SWEEP BNC 1250 0256 Specialty Connector 25 118 1 J11 FM INPUT BNC 1250 0256 Specialty Connector 25 P118 1 J12 AM INPUT BNC 1250 0256 Specialty Connector 25 P118 1 J13 PROGRAMMING 25 Pin D Series 1251 0063 ITT Cannon CONNECTOR J14 ALT SWP INTERFACE Audio 3 Pin Connector no HP Part Number DBM 25P Switchcraft TA 3F Refer to Figure 2 6 for HP IB Interface Cable information HP IB Interface connector J4 signals and pin configuration are given in Figure 2 5 A 1219 mm 48 cable assembly with a Switchcraft TA 3F Audio 3 Pin connector on each end is supplied with the Model 8755C Swept Amplitude Analyzer as the Alternate Sweep Interface Cable The complete cable may be ordered separately as HP Part Number 8120 3174 Installation 2 31 Programming Connector 2 32 The Programming Connector J13 on the rear panel of the Model 8350A provides digital control of display functions and sweep oscillator Step Up control Figure 2 7 gives a description of all pins and signals available on the Programming Connector When the Model 8410B 8411A Net work Analyzer is used with the Model 8350 the Model 8410B Source Control Cable HP Part Number 08410 60146 connects the Model 8410B rear panel SOURCE CONTROL and the Model 8350A rea
94. 64 0 00005 Vdc Refer to Figure 5 17 for adjustment location 22 Press AF 1 6 2 4 MHz 23 Adjust A4R18 for a DVM reading of 4 91883 0 00005 Vdc Refer to Figure 5 17 for adjustment location 5 27 Adjustments Model 8350A ADJUSTMENTS MEMINI E 5 20 MARKER DAC ADJUSTMENT REFERENCE A4 Scaling and Marker Assembly DESCRIPTION The 8350A is set without an RF plug in installed for a stop frequency of 10 GHz with a single marker set to 10 GHz also The rear panel POS Z BLANK BNC output high sweep retrace low forward sweep is monitored by a time interval counter and A4R28 MKR is adjusted to set the reference voltage for marker DAC 4012 so that the marker DAC output is calibrated to match the end of the sweep ramp SWEEP OSCILLATOR UNIVERSAL COUNTER TO J5 POS Z BLANK Figure 5 18 Marker DAC Adjustment Setup EQUIPMENT Sweep ttn HP 8350A Universal Counter eee rennet enna HP 5328A PROCEDURE 1 Remove the RF plug in from the sweep oscillator mainframe 2 Set the 8350A LINE switch to ON and allow the sweep oscillator to warm up for 30 minutes 3 Connect the POS Z BLANK BNC output connector on the rear panel of the 8350A to the INPUT A connector on the 5328A Universal Counter and set the 5328A controls as follows FUNCTION 20 0 0 0 ces cope eet ha hh tenir TI SAMPLE eene ehe enn CCW OSC rear
95. 755 Frequency Response Test Set 1 69 The Model 8350A Sweep Oscillator is compatible with the Model 8755 Frequency Response Test Set for broadband swept scalar Model 8350A measurements The Model 8350A provides in ternal 27 8 kHz square wave modulation of the RF output eliminating unnecessary cable connec tions to the Model 8755 or the use of an external modulator The Model 8350A can also producc alternate sweeps through use of the ALT n function which works in conjunction with the channel switching circuits in the Model 8755C This permits Channel 1 on the Model 8755C to respond only to the Model 8350A current state and Channel2 to the alternate state A single cable HP Part Number 8120 3174 connects between the Model 8350A rear panel ALT SWP INTERFACE connector and the Model 8755C front panel ALT SWP INTERFACE connector 1 70 Power Meters and Crystal Detectors 1 71 Depending upon the RF plug in unit used the RF output can be externally leveled using the HP Model 432 Power Meter or negative polarity output crystal detectors Refer to the Operating and Service Manual of the specific RF plug in used for detailed information on leveling systems that may be used with the Model 8350A RF Plug in combination NOTE The Model 435A and 436A Power Meters should not be used in Model 8350A ex ternal leveling systems Table 1 3 Model 8410B Source Control Cable 8410B Source Control Cable 8350A Connector Pin 25 pin D Type M
96. 8 ATTENUATOR CRYSTAL 84918 OPT 010 DETECTOR Connect the equipment listed above as shown in above diagram Figure 3 3 Local Operator s Check 1 of 2 Model 8350A Model 8350A Operating Information LOCAL OPERATOR S CHECKS Cont d CAUTION BEFORE CONNECTING LINE POWER ensure that all devices connected to this instrument are connected to the protective earth ground BEFORE SWITCHING ON THIS INSTRUMENT ensure that the line power plug is connected to a three conductor line power outlet that has a protective earth ground Grounding one conductor of a two conductor outlet is not sufficient NOTE BEFORE SWITCHING ON THIS INSTRUMENT ensure that the power transformer primary is matched to the available line voltage the correct fuse is installed and the safety precautions are taken See Power Requirements Line Voltage Selection Power Cables and associated warnings and cautions in Section II Procedure 1 SetLINE switch to ON position Observe that LEDs above START and STOP buttons are on with the frequency range of installed plug in displayed above them Oscilloscope trace should show detected RF signal output below zero volt reference with no discontinuities in swept trace across band 2 Press CW button Observe LED above CW on and trace is reduced to dotat center of CRT with display at center of plug in frequency range 3 Press button Observe LE
97. A fails one of the self tests an error code is displayed see explanation of error codes Figure 8 8 is a flow diagram showing the tests performed during Instrument Preset Note that the A3 Microprocessor circuits are checked initially then the digital busses are checked Once the digital circuits are verified the Instrument Preset test checks the power supplies and functional operation of the Tuning Voltage Marker and Sweep Ramp circuits Finally the digital interface with the RF Plug in 1s checked Operator Initiated Operator initiated self tests are provided to aid in troubleshooting once a problem is isolated to a particular area Most tests performed during Instrument Preset can also be initiated from the front panel Noerror codes are generated by Operator Initiated self tests Most of these tests are repetitive and provide known conditions for exercising and checking specific circuits Table 8 3 gives a brief explanation of each Operator Initiated self test Error Codes The A3 Microprocessor generates an error code if one of the self tests performed during Instrument Preset fails An error code may be displayed at each of the following locations See Figure 8 9 A3 Microprocessor Error Code LEDs Primary error code indicator and is used for all error codes If different error code indication occurs between different displays the error code indicated by the A3 Microprocessor is correct e SWEEP TRIGGER Annunciators Us
98. Capability The 8350 commu nicates on the bus in both remote and local modes In remote its front panel controls are disabled except the LINE switch and LCL key The 8350A can be addressed to listen or talk When addressed to listen the 8350A will automatically stop talking and respond to the following bus messages Data Trigger Clear Remote Local Local Lockout Clear Lockout Set Local and Abort When addressed to talk the 8350A will automatically stop listening and send one of the following messages Data Require Service or Status Byte 3 47 Displays The REM light is on when the 8350A is in the remote mode The ADRS D lightis on when the 8350A is currently addressed to talk or listen All other displays function the same as in local front panel control 3 48 Local to Remote Change The 8350 switches to remote upon receipt of the two part Remote message The two parts of the Remote message are Remote Enable REN Addressed to Listen MLA Operating Information 3 49 The Sweep Oscillator s output signal and all control settings remain unchanged with the local to remote transition 3 50 Local Mode 3 51 LocalCapability Inlocal the 8350A can send a Require Service message send a Status Byte and respond to the Remote message NOTE The 8350A can respond to all HP IB messages except the Data Message while in local However most of these messages would not normally be used in the local mode 3 52
99. D above CF and AF buttons on that displayed center frequency is at center of plug in frequency range and AF display is equal to frequency span 4 Press button Observe button LED on an blinking and a intensity dot at approximately the center of the trace 5 Press SWEEP sweep getting faster button then press DATA ENTR utton a few times and observe Press DATA ENTRY button a few times and observe sweep getting 6 Press DATA ENTRY and observe FREQUENCY TIME display is 0 100 sec Figure 3 3 Local Operator s Check 2 of 2 Operating Information Model 8350A Visual Indicators REMOTE OPERATOR S CHECK Flowchart HPL Statements BASIC Statements START REMOTE Send REN command to ensure instrument is in remote enable state REMOTE 719 Remote LED on Instrument START STOP condition preset sweep Program sweep oscillator to Instrument Preset wet 719 QUTPUT 719 wet 719 OFFA OUTPUT 719 red 719 4 ENTER 719 85 Print Start and Stop wet 719 OPF2 DUTPUT 719 OPFB E equals i ur piug in frequencies red 71 B ENTER 719 range prt START prt STOP FREQ B PRINT START FREQ FRINT STOP FREG B wrt 719 DUTPUT 719 CW LED on icu red 719 C ENTER 719
100. Figure 4 11 PRESET START 2 GHz s on8350A Set DISPLBLANK off and K on 9 Adjust POWER control on plug in for a maximum output power of 25 millivolts peak trace on oscilloscope display in order to keep crystal in square law output range 10 Select points on trace where V MAX V MIN appear to have greatest separation and calculate V MAX V MIN for each point 11 Convertgreatest V MAX V MIN ratio noted in step 10 into source match SWR using Figure 4 13 on the 0 dB loss line The SWR should be less than noted on the performance test record card step 11 Table 4 4 Loss in Coaxial Cable Attenuation dB 100 ft at Selected Frequency 2 4 3 6 5 2 6 6 8 8 2 3 3 4 6 5 9 0 4 8 7 0 13 0 17 0 6 2 9 2 17 5 23 5 6 2 9 2 17 5 23 5 0 95 1 5 3 2 4 5 9 5 2 4 3 6 5 2 6 6 8 8 16 7 2 1 3 1 5 0 6 5 8 8 17 5 2 3 3 4 5 2 6 5 9 0 17 0 2 1 3 1 5 0 6 5 8 8 16 7 1 5 2008 3 5 4 4 6 0 11 7 0 95 1 5 2 4 3 2 4 5 9 5 0 95 1 5 2 4 3 2 4 5 9 5 0 69 1 12 1 85 3 6 7 7 0 69 1 12 1 85 cma 3 6 7 7 4 8 7 0 10 5 13 0 17 0 32 0 1 5 2 3 3 5 4 4 6 0 11 7 Performance Tests Model 8350A PERFORMANCE TESTS 6 0 n Lo 5 0 1 0 dB LOSS 4 0 VMAX a 2 0 dB LOSS MIN st 3 0 2 9 2 8 27 78 3 0 dB Lose 2 5 2 4 2 3 2 2 4 p dB LOSS 2 1 2 0 1 9 1 8 1 7 1 6 1 5 1 3 1 2 1 0 1 0 1 75 75 SOURCE MATCH
101. Figure 4 8 Note the peak to peak residual FM across the top of the trace and divide it by two to get the peak Record the peak residual FM on the test card step 5 6 If plug in is multiband unit repeat steps 3 4 and 5 at the frequency ies on the test card step 6 PEAK TO PEAK RESIDUAL FM Figure 4 8 Residual FM Display on Spectrum Analyzer With optional Modulation Analyzer 5A Set spectrum analyzer to 1 MHz bandwidth and 0 spanwidth Adjust the spectrum analyzer fine frequency control for maximum amplitude The spectrum analyzer is now being used as a down converter only Set 8901A high pass filter to 50 Hz and low pass filter to 15 kHz Press 8901A AUTOMATIC OPERATION PEAK and PEAK HOLD keys on Modulation Analyzer Check and record the displayed Residual FM on the test card step 5 6A If plug in is a multiband unit repeat steps 3 4 and 5A using the frequency ies on the test card step 6 Model 8350A Performance Tests PERFORMANCE TESTS a e 4 17 SPURIOUS SIGNALS TEST SPECIFICATION See Performance Test Record Card in section IV of plug in manual for harmonic and non harmonic spurious signals specifications DESCRIPTION RF output signal from sweep oscillator is displayed on a spectrum analyzer to verify that harmonic and non harmonic spurious signals are at or below the specified level RF SPECTRUM ANALYZER SWEE OSCILLATOR PLUG IN
102. General Information Model 8350A 3 O00 8 E to 2 o dgooe 8t3 ooo 8350A SWEEP OSCILLATOR 8350A Sweep Oscillator Operation and Service Manual January 1 1980 08350 90001 POWER CABLE POWER CABLE PLUG SUPPLIED DEPENDS ON COUNTRY OF DESTINATION REFER TO SECTION FOR PART NUMBER INFORMATION Figure 1 1 Model 8350 Sweep Oscillator Model 8350A General Information SECTION I GENERAL INFORMATION 1 1 INTRODUCTION 1 2 This Operating and Service Manual con tains information required to install operate test adjust and service the Hewlett Packard Model 8350A Sweep Oscillator Figure 1 1 shows the Model 8350A and power cable 1 3 This manual is divided into eight major sections which provide the following information a SECTION I GENERAL INFORMATION includes a brief description of the instru ment safety considerations specifications supplemental characteristics instrument identification options available accessories available and a list of recommended test equipment b SECTION II INSTALLATION provides information for initial inspection prepar ation for use battery information rack mounting storage and shipment c SECTION III OPERATION consists of three subsections which contain general operating information local operation infor mation non HP IB and remote operation information Programming Notes which provide information on HP IB use of the Model 8350
103. I of this manual J Model 8350A Performance Tests PERFORMANCE TESTS 4 14 OUTPUT AMPLITUDE TEST Cont d 1 Connect equipment as shown in Figure 4 3 Turn on Storage Normalizer and Swept Amplitude Analyzer Adjust GAIN and REFERENCE POSITION controls as per the Amplitude Analyzer manual Adjust Storage Normalizer per its operation section to match the Swept Amplitude Analyzer using the Network Analyzer card 2 Press INSTR PRESET and SHIFT then engage L MOD on the 8350A Set plug in POWER LEVEL display to specified maximum leveled power and ALC mode to MTR 3 Adjust power meter CALIBRATION FACTOR to the value on the thermistor mount corresponding to the frequency displayed on the 8350A Set power meter RANGE switch and adjust plug in EXT MTR ALC CAL for a power meter reading 12 dB below plug in displayed power The 12 dB is due to the following losses Power Splitter 6 dB Attenuator 3 dB and LJ MOD 3 dB 4 Press SELECT CH 1 and BYPASS on storage normalizer 5 Setamplitude analyzer controls as follows VIDEO OFF CHANNEL 1 DISPLAY eeu ch t hd Fx rene hatt 10 VERNIER ON OFFSET 202040222555 n E 00 CHANNEL 2 DISPLAY 2226 95 RAE e ERA buttons out 6 Adjust CH1 REFERENCE LEVEL VERNIER to center trace Change dB DIV 100 25 and center trace again using REFERENCE VERNIER 7 Set 8
104. IZE Program Code Frequency See Plug in 1 MHz Step Size Frequency STEP SIZE Limits P STEP Step Up INCREMENT STEP Step Down DN DECREMENT BACK SPACE Back Space BK Default Reset to default STEP SIZE STEP SIZE Figure 3 11 Data Entry Step Keys Keyboard 2 of 2 35 Operating Information Model 8350A Modulation Blanking DESCRIPTION This function block controls the frequency marker display mode RF power and external CRT control Mainframe frequency markers can be RF amplitude dips or CRT intensity dots via Z axis control The RF power can be turned off during the retrace sweep The CRT display retrace sweep can be blanked The internal squarewave amplitude modulation can be enabled The squarewave frequency is 27 8 KHz standard for proper operation with the HP 8755 Frequency Response Test Set or internally selectable see Section IV for 1 KHz for proper operation with ae d 415 SWR Meter and other instruments The sweep input output connector is also in this i PANEL LAYOUT AMPTD DISPL RF LI MKR BLANK BLANK Mop SWEEP OUTPUT ON OFF SWEEP INPUT FUNCTIONS INDICATORS AMPLITUDE MARKER This function when engaged light on sets the mainframe frequency markers into RF amplitude dips instead of CRT intensity dots via Z axis control DISPLAY BLANKING This function when engaged light on blanks the retrace sweep on CRT displays via
105. Mode selection vernier and offset FREQUENCY TIME Markers and sweep control SAVEn RECALLn ALTn Storage Registers Step Up Advance DISPLAY FUNCTIONS Blanking Modulation and Sweep Out In 83500 SERIES PLUG INS Power signal and crystal markers USE WITH SPECIFIC MEASUREMENT EQUIPMENT HP 8755S Frequency Response Test Set HP 8410B Network Analyzer HP 7010B and other X Y Recorders HP 5343A Frequency Counter APPENDIX 1 Rear panel connector information APPENDIX 2 Use of 86200 series Plug Ins with 11869A Adapter APPENDIX 3 Summary of Sweep Oscillator front panel controls with fold out front panel drawing NOTE If a 86200 series RF Plug in and 11869A Adapter are used the plug in coding on the adapter must be set properly to get the correct frequency display GETTING STARTED When the 8350A is turned on or when the INSTR PRESET key is pressed the front panel of the 8350A is set to the following pre determined state The RF outputis swept over the full frequency range of the plug in at the maximum specified leveled output power minimum sweep time for the RF Plug in installed and the internal square wave amplitude modulation is off Local Operation Model 8350A Example 8350A with 83525A 0 01 8 4 GHz Plug in To change from the INSTR PRESET state to 4 2 to 62 GHz sweep in START STOP mode 0 20 second sweep time 4 5 dBm output power 27 8 KHz square wave modulati
106. N This function block contains the keys to select one of the three desired modes START STOP CW CF AF or a modification ofthe mode VERNIER OFFSET The two displays provide a visual display of the frequencies in the mode selected The rotary control knobs provide a variable control to change the frequency of the function selected PANEL LAYOUT FREQUENCY 00 m QJ Q FUNCTIONS INDICATORS START Enables START STOP mode and allows selection of the lower frequency limit of sweep STOP Enables START STOP mode and allows selection of the upper frequency limit of sweep CW Enables single frequency CW mode and allows selection of the frequency Swept CW Enables CW mode with full SWEEP OUTPUT voltage 0 10 volts CF Enables center frequency delta frequency mode and allows selection of the center frequency AF Enables center frequency delta frequency mode and allows selection of the total frequency span VERNIER Provides high resolution adjustments to values of the effective sweep center and CW frequencies Range is 0 1 percent of plug in frequency band OFFSET Offset RF frequency by entered value START STOP CF AF and CW displays do not indicate the change Light indicates non zero OFFSET value 0 This lamp indicates when a non zero frequency vernier or offset value is in effect To zero the vernier or offset enter 0 MHz Figure 3 6 Frequency Sweep Mode 1 of 3 21
107. ND POSITION CHECK FUSE TO MAKE SURE IT IS OF COR RECT RATING AND TYPE FOR INPUT AC LINE VOLTAGE FUSE RATINGS FOR DIF FERENT LINE VOLTAGES ARE INDICATED BELOW POWER MODULE INSERT CORRECT FUSE IN FUSEHOLDER Figure 2 1 Power Line Module 2 2 Model 8350A e0 L N m Cable HP Part Number 8120 1351 8120 1703 8120 139 8120 0696 8120 169 8120 1692 8120 1348 8120 1398 8120 1754 8120 1378 8120 1521 8120 1676 8120 2104 8120 0698 8120 1957 8120 2956 8120 1860 Table 2 2 AC Power Cables Available Cable Length inches Plug Description Mint Gray Straight BS1363A 90 Mint Gray Straight NZSS198 ASC112 90 Mint Gray Straight CEE7 Y11 90 Mint Gray Straight NEMAS5 1 5P 90 Straight NEMAS 1 5P Straight NEMAS 15P 90 Straight NEMAS 15P Black Black Black Jade Gray Jade Gray Jade Gray Straight SEV1011 1959 24507 Type 12 Straight NEMA6 1 5P Straight DHCK 107 90 Straight CEE22 VI Systems Cabinet use Installation For Use In Country United Kingdom Cyprus Nigeria Rhodesia Singapore Austrailia New Zealand East and West Europe Saudi Arabia Egypt So Africa India unpolarized in many nations United States Canada Japan 100V or 200V Mexico Philippines Taiwan Switzerland United States Canada Denmark Part number shown for plug is industry identifier for plug only Number shown for cable is HP Part Num
108. NMI Low Plug In Non Maskable Interrupt is not used at this time but is connected to the 64 pin Plug in interface connector for possible future use L PINMI must never go low logic low on this line can only be caused by a short on the motherboard a shorted 64 pin Plug in Connector or a failure on the A3 assembly The circuitry that receives L PINMI was designed to operate in the following manner however at this time no valid memory instructions reside in the L PINMI Service Routine Address A logic low on L PINMI will place the 8350B in an undefined state Schmitt trigger NAND gates U4C and U4D shape and buffer the L PINMI Low Plug in Nonmaskable Interrupt control line onto the microprocessor nonmaskable interrupt control input L NMI When L PINMI is active low L NMI is active low causing the microprocessor after the current instruction is executed to jump to the Interrupt Service Routine stored in ROM This interrupt can not be masked so the microprocessor always responds to an active L PINMI L PINMI can be disabled by grounding 16 NMIE Nonmaskable Interrupt Enable This forces U4D pin 13 low causing U4D pin 11 high not active regardless of the state of L PINMI Model 8350A Status Buffer 3 state buffer U20 buffers and inverts the Plug in and marker flags power supply status lines the L TEST control line and all but one of the interrupt requests onto the microprocessor data bus The combination of these lines is call
109. PE goes low and at no other times Check all data lines for adjacent shorts Model 8350A Instrument Bus The Instrument Bus terminations on the A3 Board include four buffers one for data two for addressing and one for control U26 is always enabled and passes six inverted control signals In the Free Run Mode L I OCLK should run at 973 kHz L I OSTB should run at the same rate but in bursts corresponding L IBE going low The others I OEI I OE2 OE3 and PIROME are inverted versions of the signals shown by the Address Decoder Timing Diagram U27 and U29 pass thirteen inverted address lines plus L WRITE to the Instrument Bus when L IBE is low In the Free Run Mode the address lines should show the usual divide by two relationship but only when L IBE is active low L IRD should remain low since the microprocessor only reads during Free Run U25 is a bi directional 3 state buffer also enabled by L IBE The buffer is easily checked during Free Run Remove the A4 A5 and A8 Assemblies from the Motherboard and remove the RF Plug in Connect L A10 TP11 to the data line in question on the Instrument Bus side By triggering off the L IBE line the L A10 signal should be observed on the corresponding test point of the Data Bus when U25 is enabled Note that data is only read in Check all lines to eliminate the possibility of adjacent shorts Model 8350A full frequency range of the RF plug in installed If the 8350
110. Receiving The Trigger Message 3 73 8350A responds to the Group Execute Trigger GET command to the HP IB bus select code and a Selective Device Trigger to the 8350A HP IB address The effect of the GET command is to trigger the sweep if presently in the External Sweep Trigger mode only otherwise no action is taken The response is as if a Data message consisting of the Single Sweep Trigger T4 program code were transmitted 3 74 Receiving The Clear Message 3 75 The 8350A responds to both Device Clear DCL and Selective Device Clear SDC by resetting all HP IB handshake lines to the inactive state The effect is to remove the 8350A from any Talker or Listener control functions The 8350A responds by clearing the Status Byte and the Extended Status Byte 3 76 Receiving The Remote Message 3 77 The Remote message causes the 8350A to switch to remote mode It has two parts 1 remote enable and 2 address to listen The Sweep Oscillator s output and all other controls do not change with the local to remote transition Operating Information 3 78 The REM light turns on only when the 8350A is in remote mode and after receiving its first Data Message The ADRS D light turns on when the 8350A is addressed to talk or listen 3 79 Receiving The Local Message 3 80 The 8350A returns to front panel control when it receives the Local message Its output and all other controls do not change with the remote to lo
111. Remote to Local Change The 8350 returns to local control upon receipt of the Local or Clear Lockout Set Local message It can also be set to local by pressing the front panel LCL key assuming that local lockout is not in effect The Sweep Oscillator s output signal and all control settings remain unchanged with the remote to local transition 3 53 Local Lockout When datatransmission is interrupted which can happen by returning the 8350A to local with the front panel LCL key the data could be lost This would leave the 8350A in an unknown state To prevent this a local lockout is recommended to disable the LCL key Local lockout remains in effect until the 8350A is returned to the local state by either turning the LINE switch off on or by programming the Local Message 3 54 8350A Address Assignment Information 3 55 The 8350A has a primary address that is determined by an internal storage register The register is initialized upon power turn on by reading the address bits A5 through Al from switches located on the 8350A A8 HP IB Assembly Note that these switches are factory preset to decimal 19 Listen address of 3 Talk address of S The 8350A HP IB address can be dynami cally changed from the front panel in local mode by executing the Set HP IB Address function Shift Local The present 8350A HP IB address can be found by pressing the SHIFT followed by the LCL key 15
112. Resolution lt 10 Hz Time Period Mode Frequency Range 220 kHz Resolution lt 50 uS Oscilloscope Probe 1 1 General Purpose Probe HP 10008B Modulation Analyzer May be used in addition to Spectrum HP 8901A Analyzer Frequency Range Must cover auxiliary IF Output frequency of Spectrum Analyzer used Residual FM X10 Hz Power Meter Power Range 20 to 10 dBm HP 432A e No substitution when used for external power meter leveling General Information Table 1 4 Recommended Test Equipment 2 of 4 Critical Specifications Recommended Model CM E Thermistor Sensor Frequency Range 0 01 to 12 4 GHz Maximum SWR lt 1 75 Frequency Counter Frequency Range 0 01 to 12 4 GHz Sensitivity lt 20 dBm Maximum Input Power 20 dBm Frequency Accuracy lt 1 kHz Directional Coupler Frequency Range 0 1 to 2 0 GHz Nominal Coupling gt 20 dB Maximum Coupling Variation lt 1 dB Minimum Directivity gt 32 db Directional Coupler Frequency Range 2 to 12 4 GHz Mean Output Coupling 220 dB Output Coupling Variation lt 1 dB Minimum Directivity 226 dB RMS Voltmeter dB Range 20 to 70 dBm 0 dBm 1 mW into 600 Ohms Frequency Range 10 Hz to 10 MHz Accuracy 5 of full scale Function Generator Frequency Range 0 1 Hz to 10 MHz Output Level 10V p p into 50 Ohms Output Level Flatness lt 3 from 10 Hz to 100 kHz lt 10 from 100 kHz to
113. STEP ATTENUATOR ACCURACY TEST OPTION 002 SPECIFICATION If plug in is Option 002 see Performance Test Record Card in section IV of plug in manual for Attenuator Accuracy specifications DESCRIPTION The plug in RF output is compared to a specially calibrated attenuator and displayed on a spectrum analyzer RF SPECTRUM ANALYZER PLUG IN SWEEP OSCILLATOR il CALIBRATED ATTENUATOR Figure 4 19 Attenuator Accuracy Test Setup EQUIPMENT Plug in Bede deua HP 83500 series Calibrated Step HP 8495A Opt 890 Spectrum HP 8565A PROCEDURE NOTE Frequency may be set to any value listed on Calibration Report within Plug in frequency Use Calibration Report data for frequency of plug in output 1 Connectequipment as shown in Figure 4 19 Press 8350A the frequency and power level shown on the test card step 1 2 Set controls as follows Step Attenuator As shown test card step 2 4 30 Model 8350A Performance Tests PERFORMANCE TESTS 4 23 STEP ATTENUATOR ACCURACY TEST OPTION 002 Cont d Spectrum Analyzer Set all normal settings controls marked with green INPUT ATTEN eb Ad 10 dB REFERENCE LEVEL ore ow EE
114. SWEEP INPUT FREQUENCY METER LOW RANGE FREQUENCY METER HIGH RANGE IF NEEDED o o o c 16 O e gt CRYSTAL DETECTOR FREQUENCY COUNTER Figure 4 2 Alternate Swept Frequency Accuracy Test Setup such as HP 1222A or 1740A Frequency Meters as needed to cover frequency range of plug in 0961042 34 40123 GEHE s ECTS Thelow frequency limit of the Frequency Meters is 0 96 GHz which limits the RF Plug ins with output frequencies lower than 1 GHz to a swept frequency check of 1 00 GHz or using the 5343A HP 536A HP 537A EQUIPMENT Piona PUE cce dd HP 83500 series Crystal 84708 Frequency HP 5340A Any general purpose oscilloscope Model 8350A Performance Tests PERFORMANCE TESTS e 4 13 FREQUENCY RANGE AND ACCURACY TEST Cont d 7A Connect equipment as shown in Figure 4 2 Use Frequency Meter s high and low frequency range of the installed plug in Press 8350A i then set sweep time to 105 msec If start frequency
115. SWR Figure 4 13 Conversion of Oscilloscope Trace to Source Match SWR 4 22 Model 8350A Performance Tests PERFORMANCE TESTS 4 19 RESIDUAL AM SPECIFICATION See Performance Test Record Card in section IV of plug in manual for Residual AM specification DESCRIPTION The RF Output signal from RF Plug in is amplitude modulated with square wave from the 8350A This modulated signal is used to establish a reference on the RMS voltmeter that is 9 dB below actual carrier signal The 9 dB reduction occurs because of voltmeter response to square wave and square law response of crystal detector Modulation is then removed and magnitude of Residual AM component is measured with respect to established reference RMS VOLTMETER SWEEP RF OSCILLATOR PLUG IN CRYSTAL 2 FOOT ATTENUATOR DETECTOR CABLE E EQUIPMENT RF Plugin c a e hr rar AREE HP 83500 series RMS Voltmeler eere ner es HET RERO ERR HP 3400A Crystal HP 423B Refer to PROCEDURE 60 cm 24 in cable Limits bandwidth to approximately 100 2 HP11170B PROCEDURE 1 Connect equipment as shown in Figure 4 14 using a 20 dB attenuator 2 Press engage 1 kHz or 27 8 kHz disengage NOTE A41 dB decrease in the RMS voltmeter indication corresponds to a 50 dB reduction in signal leve
116. Sekine wait dee AE urt UG 161 dap end 3191 Error asie 1 LE Test is Verified iste m ter t ES Model 8350 Performance Tests Paragraph Major Equipment Frequency Counter Table 42 Performance Test Frequency Range and CW Accuracy Frequency Range CW accuracy Swept Frequency Accuracy Marker accuracy Power Meter Frequency Response Test Set Output Amplitude Power Meter Leveling Maximum Leveled Power Power variations Power level accuracy Power Sweep Slope Compensation Frequency Stability Frequency Counter With Line Voltage Directional Coupler WithPower Level Adjustable Short With Time 10 minutes Adjustable AC Line With Load Impedance Transformer Residual FM Spectrum Analyzer At 10 kHz bandwidth Spectrum Analyzer Spurious Signals Harmonic Non Harmonic Output VSWR Directional Coupler Detector Oscillator Air Line RMS Voltmeter Residual AM Spectrum Analyzer Function Generator Frequency Counter Oscilloscope Delay Line Discriminator Power Splitter External FM Deviation Oscillascope Function Generator Delay Line Discriminator FM Response Spectrum Analyzer AM ON OFF Ratio and Square Wave Symmetry Spectrum Analyzer Attenuator Accuracy Option 002 Step At
117. T 0 0 MI 3 0 0 0 M2 0 1 The FREQUENCY TIME display should indicate 01 This sets Digital to Analog Converter DAC A4UIO to 01H 7 Adjust A4R44 CW OFFSET DVM reading of 0 20508 0 00002 Vdc Refer to Figure 5 17 for adjustment location 8 Press BK SP BK SP The FREQUENCY TIME display should indicate FF This sets A4U10 DAC to its maximum level 9 Adjust A4R22 VERNIER fora DVM reading of 0 19492 0 00002 Vdc Refer to Figure 5 17 for adjustment location 10 Press 8 0 The FREQUENCY TIME display should indicate 80 This sets A4U10 DAC to midrange 11 Check to insure that the DVM reading is 0 20000 0 00002 Vdc 12 Press 13 Remove A4 A5 shield cover and adjust A4R27 CW for a DVM reading of 10 2000 0 0001 Vdc Refer to Figure 5 17 for adjustment location AF GENERATION Adjustments NOTE The validity of this adjustment is based in part on the accuracy of the VSW1 input from the Sweep Generator assembly Proper adjustment of the Ab Sweep Generator circuits is necessary before proceeding with this adjustment procedure 5 25 lt e i e 00 qmi o 3 gt i ADJUSTMENTS 4 SCALING AND 5 19 FREQUENCY CONTROL ADJUSTMENTS Cont d MARKER Adjustments meg mie m LS mee mer 9 6 0 O stu O G 59 G 9A n Q amp A4TP11 VTUNE
118. Table 1 1 and Supplemental Infor mation Table 1 2 3 8 Panel Features 3 9 Figure 3 1 Front Panel features provides a reference to a functional block figure number which provides a complete description of each control within the function block 3 10 RearPanelfeatures are described in Figure 3 2 3 11 OPERATOR S CHECKS 3 12 The local operators check Figure 3 3 allows the operator to make a quick check of the main instrument functions prior to use This check assumes that an RF plug in is installed in the Sweep Oscillator and that a 10 dB attenuator oscilloscope and appropriate crystal detector are available If these items are not available the preliminary self test may still be performed 3 13 The remote operator s check Figure 3 4 allows the operator to make a quick check to the main remote functions prior to use This test is shown in program statements for HPL and BASIC and a general flow chart 3 14 OPERATING INSTRUCTIONS 3 15 Located underneath the Sweep Oscillator is a pullout information card which contains information on general operating instructions some remote programming information some plug in usage information 3 16 Fora complete reference of each function refer to the function group index Table 3 2 3 17 LOCAL OPERATION 3 18 The operation of the 8350A Sweep oscil lator in the Local mode is described in the Local Operation handbook and by functional block figures indexed in the t
119. Z axis control RF BLANKING This function when engaged light on blanks turns off the RF power during the retrace sweep LI SQUAREWAVE MODULATION This function when engaged light on enables the internal amplitude modulation squarewave The standard squarewave frequency is 27 8 KHz internally selectable to 1 KHz SWEEP OUTPUT INPUT When Sweep Oscillator is in manual or time sweep mode this connector provides a linear ramp voltage from 0 to 10 volts that is synchronous with RF sweep In external sweep mode connector is input for a sweep ramp from 1 to 10 volts LIMITATIONS CONCERNS 1 Changing frequency of modulation 1 or 27 8 KHz requires removal of a jumper see Adjustment section 2 Plug in frequency markers are controlled from plug in for CRT intensity dots or RF amplitude dips Figure 3 12 Modulation Blanking 1 of 2 36 Model 8350A Operating Information Internal squarewave modulation and a External AM signal can be used simultaneously CRT Z axis control is provided with both positive and negative polarity control for blanking via rear panel POS Z BLANK or NEG Z BLANK Mainframe frequency markers when used in the CRT intensity dot mode are useable with positive polarity Z axis control only LOCAL FUNCTION PROCEDURE Range and Resolution Amplitude Markers Display Blanking RF Blanking Squarewave Modulation REMOTE FUNCTION PROCEDURE Program Code ret oe ness sot See
120. able of contents and Table 3 2 1 Operating Information Model 8350A FRONT PANEL FEATURES POWER Level Control See Figure 3 13 DATA ENTRY See Figure 3 11 FREQUENCY Markers Sweep TIME Marker Transfer See Figure 3 8 Crystal MARKERS 83522A and 83525A See Figure 3 16 FREQUENCY Sweep Modes See Figure 3 6 Storage Registers See Figure 3 9 ALC MODE LINE This switch controls power to Sweep Oscil lator and instal led Plug in INSTRUMENT STATE See Figure 3 7 SWEEP TRIG GER SWEEP See Figure 3 10 Modulation Blanking See Figure 3 12 Pull Out Card Provides brief summary of Sweep Oscillator controls and functions Figure 3 1 Front Panel Features See Figure 3 15 Signal Control See Figure 3 14 Model 8350A Operating Information REAR PANEL FEATURES Plug in connectors as apply 1V GHz Frequency Reference output connector provides approximately 1V DC per GHz of sweep signal output EXT MKR 1V RMS MAX on 83522A and 83525 only input connector allows use of external markers when plug in front panel EXT MARKER FREQ button is engaged SQUAREWAVE INPUT connector provides input connector for external pulse or squarewave modu lation 8755 compatability EXT ALC and RF OUTPUT These connectors re place the corresponding front panel connectors in Option 004 plug ins SERIAL PLATE and Option label HP INTERFACE BUS input
121. adjustment procedure is based in part on the accuracy ofthe 10V REF DAC power supply Proper adjustment of the 10V REF DAC power supply is necessary before proceeding with this adjustment procedure Adjustments nena ADJUSTMENTS 5 15 SWEEP TIME ADJUSTMENTS Cont d 3 Connect the POS Z BLANK BNC output connector on the rear panel ofthe 8350A to the connector on the 5328A Universal Counter and set the 5328A controls as follows FUNCTION oves ben a TI SAMPLE CCW OSC rear panel csse INT ARM ON OFF rear OFF STORAGE ON OFF rear panel ON POWER ON Input Amplifier Control Switch es 4 COMA Channel A 8 4 Channel A Coupling DC Channel A X10 Channel A Trigger LEVEL CW Channel B T Channel B Coupling eee DC Channel B nnn X10 Channel B Trigger LEVEL CW Position the sweep oscillator upright as shown in Figure 5 8 and remove the top cover Set the 5328A FREQUENCY RESOLUTION control to 10 KHz 102 From the CW position adjust Channel A and B trigger LEVELS CCW until just past the po
122. ains information cautions and warnings which must be followed to ensure safe operation and to retain the instrument in safe condition Service and adjustments should be performed only by a skilled person whois aware of the hazard involved Adjustments in this section are performed with power supplied to the instrument while protective covers are removed There are voltages at points in the instru ment which can if contacted cause personal injury Be extremely careful Adjustments should be performed only by a skilled person who is aware of the hazard involved WARNING Capacitors inside the instrument may still be charged even if the instrument has been disconnected from its power supply source NOTE Use a non metallic adjustment tool when ever possible 5 5 EQUIPMENT REQUIRED 5 6 Table 1 4 lists the equipment required for the adjustment procedures If the test equipment recommended is not available other equipment may be used if its performance meets the Critical Specifications listed in Table 1 4 The specific equipment required for each adjustment is refer enced in each procedure 5 7 FACTORY SELECT COMPONENTS 5 8 Table 5 2 contains a list of factory selected components that include the reference desig nation the related performance test the allowable range of values and the basis of selection Nominal values are given for the factory selected components designated by an asterisk on the schemat
123. ale HP Part No 1251 0063 Description L SSRQ Low Stop Sweep Request SYNC TRG High Synchronizing Trigger GND DIG Digital Ground 1 10 HP Part Numher 08410 60146 8410B Connector Pin 14 pin Micro Ribbon Male HP Part No 1251 0142 Wire Color Code t N Model 8350A General Information Table 1 4 Recommended Test Equipment 1 of 4 instrument Critical Specifications Recommended Model Spectrum Analyzer Frequency Range 0 01 to 22 GHz HP 8565A Residual FM X100 Hz Must have auxiliary IF output when used with the HP 8901A Modulation Analyzer Oscilloscope Dual channel HP 1740 X vs Y display mode Sensitivity lt 0 1 uS DIV Horizontal Sweep Rate lt 0 1 uS DIV Display Mainframe Compatible with HP 8755C Swept Ampli 182T 180TR tude Analyzer and HP 8750A Storage Normalizer Swept Amplitude Capable of transmission measurements HP 8755C Analyzer Power Resolution lt 0 25 dB DIV Detector Compatible with Swept Amplitude Analyzer HP 11664A Frequency Range 0 01 to 12 4 GHz Power Range 20 to 10 dBm Power Splitter Frequency Range 0 01 to 12 4 GHz HP 11667A Output Port Tracking lt 0 25 dB Maximum Input Power gt 20 dBm Storage Normalizer Compatible with Display Mainframe and HP 8750A Swept Amplitude Analyzer Digital Voltmeter Accuracy lt 0 005 HP 3455A Input Impedance 210 Universal Counter Frequency Mode HP 5328A Frequency Range 230 kHz Frequency
124. amming Connector Signals and Pin Configuration 2 11 Installation 2 42 Front Handles Option 907 CAUTION When installing front handles and rack mount kits insure that the correct screws specified in the installation figures in this section of the manual are used Use of a screw which is longer than the specified length may result in damage to internal components located behind the screw mounting holes in the instrument 2 43 Instruments with Option 907 contain a Front Handle Kit This kit supplies the necessary hardware and installation instructions for mount ing two front handles on the instrument Instal lation instructions are also given in Figure 2 9 Keep this area clear Model 8350A Additional Option 907 Kits may be ordered as HP Part Number 5061 0089 2 44 Rack Mounting Option 908 2 45 Instruments with Option 908 contain a Rack Mount Kit This kit supplies the necessary hardware and installation instructions for prepar ing the instrument to mount on an equipment rack with 482 6 mm 19 in support spacing In stallation instructions are also given in Figure 2 10 Additional Option 908 Kits may be ordered as HP Part Number 5061 0077 2 46 Rack Mounting with Front Handles Option 909 2 47 Instruments with Option 909 contain a Keep this area clear Figure 2 8 Model 8350A Ventilation Clearances and Airflow 2 12 Model 8350A Installation INSTALLATION INSTRUCTIONS
125. and amplitude to full counterclockwise Adjust function generator amplitude control slowly clockwise while monitoring display on spectrum analyzer Deviation from center line should be symmetrical at first then become non symmetrical as deviation increases 3 Note point at which deviation becomes non symmetrical Record the highest symmetrical observed deviation frequency on the test card step 3 4 Turn 8350A LINE switch to off Remove RF plug in and switch modulation coupling to cross over refer to plug in manual section III Install the RF plug in and turn the 8350A LINE switch to on Then repeat steps 2 and 3 and record the deviation on test card step 4 gt 100 Hz FM Modulation 4 25 Performance Tests 4 26 PERFORMANCE TESTS 4 20 EXTERNAL FREQUENCY MODULATION TEST Cont d 10 11 OSCILLOSCOPE SWEEP RF OSCILLATOR PLUG IN FUNCTION GENERATOR Figure 4 16 gt 100 2 Frequency Modulation Test Setup Set function generator frequency to 1 MHz Set both oscilloscope inputs to 500 Set function generator output amplitude to 0 1 volt p p output Connect equipment as shown in Figure 4 16 with function generator output not connected Adjust CW and CW VERNIER for a delay line discriminator output of 0 volts as observed on oscilloscope Note frequency counter reading on test card step 6 Connect funct
126. ar transmission and reflection measurements requiring up to 60 dB of dynamic range and for absolute power measurement from 50 dBm to 10 dBm The 8350A has the following features designed specifically for use with the 87555 Frequency Response Test Set RF Square wave Modulation By engaging key an internally generated squarewave modulation of the RF output is available thus eliminating the need for external modulating equipment A jumper internal to the 8350A enables the square wave modulation frequency to be changed to 1 KHz see section 5 of the Operating and Service manual for details 15 Local Operation Model 8350A Alternate Sweep Function The ALTn function of the 8350A allows two different frequency and power settings to be swept on successive sweeps The front panel setting and the setting stored in a memory register location n n 1 9 be selected for alternate sweeps The Alternate Sweep Function will not work properly with the 8755A or 8755B See Figure9 fora sweep display of the ALTn function when used to view a bandpass response at different resolutions and offsets 0 25 dB DIV 10 dB DIV Figure 9 Alternate Sweep Function Display Some other features enhancing the convenience and versatility of the 8755 are Marker The MKR A function is useful when using alternate sweep in overlapping different sweep widths The overlapping portion of one of the sweeps can have an incr
127. arameters via the keyboard Output Controls Can control marker dis play mode RF and display blanking and internal square wave modulation of the RF output 10 Sweep Mode Selects External Manual or 11 Timed sweep mode MARKER SWEEP Causes Marker 1 fre quency to temporarily become start of sweep Marker 2 frequency to become stop of sweep Sweep Trigger Determines how sweep will trigger MKR CF Causes center frequency of sweep to be shifted to the frequency of the currently active marker Line switch Turns on off 8350A mainframe and plug in Instrument Preset Selects pre determined instrument state START CF CW AF STOP Sweep mode keys Selects mode of output and display Left frequency Control Adjusts START CW CF VERNIER or OFFSET Left Frequency Display Displays START CW CF VERNIER or OFFSET frequency in GHz or MHz depending on mode selected plus self test error codes Figure 18 Front Panel Controls 27 P O HP Part No 08350 90001 Printed in U S A SERVICE 8350A SWEEP OSCILLATOR IV PERFORMANCE TESTS V ADJUSTMENTS HEWLETT PACKARD Model 8350A Performance Tests SECTION IV PERFORMANCE TESTS 4 1 INTRODUCTION 4 2 The procedures in this section test the electrical performance of the 8350A Sweep Oscillator 83500 series RF Plug in combination with the specifications of the Plug in used as the
128. arker 1 must be less than or equal to Marker2 in frequency if M1 is greater than M2 the values of M1 and M2 are permanently interchanged By varying the active marker 1 or 2 or by turning the START STOP controls the sweep limits can be altered When both M1 and M2 are not on the sweep occurs between the most recent values of M1 and M2 To exit this mode press MKR SWEEP and the lamp over the key will go out Pressing SHIFT MKR SWEEP causes the values of M1 and M2 to become the START STOP frequency values permanently Figure 4 Frequency Time Controls 2 of 3 10 Local Operation Model 8350A MARKER TO CENTER FREQUENCY MKR When this key is pressed the frequency ofthe active marker becomes the center frequency ofthe sweptoutput The frequency span remains unchanged if within the frequency limits ofthe plug in If original frequency span exceeds plug in limits the frequency span will be reduced to retain symmetry MKR A This function allows the frequency difference between any two markers to be displayed and the trace between them intensified if intensity markers are selected 1 Press SHIFT MI the display shows the frequency difference between the currently active marker and the one that was previously active The FREQUENCY TIME control keyboard and step keys can change the active marker value To exit MKR A mode press OFF Example Press M4 and set frequency via DATA ENTRY keyboard o
129. arkers M1 through M5 may be enabled by pressing the marker key corresponding to the marker desired When a marker is activated it is set to its last active frequency unless INSTRUMENT PRESET has been activated in which case the marker will be set to the center of the fullband sweep A marker can be in one of three states ACTIVE Lamp in center of key flashing ON Lamp on OFF Lamp off Only one marker at a time the active marker can have its value altered The five mainframe markers are normally supplied through the positive Z axis blanking pulses connector on the rear panel By pressing the AMPTD MER key the markers may be displayed as amplitude dips on the RF output When a marker is active the keyboard FREQUENCY TIME control and step keys be used to modify its value The value of the active marker in GHz MHz is displayed By pressing OFF the active marker only will be turned off If multiple markers are on the remaining lamps will remain lit although the display will go blank A marker may be initially activated or returned to active state by pressing the corre sponding marker key All markers may be turned off simultaneously by pressing SHIFT OFF Example Press Note M3 lamp flashing other lamps off Press M5 Note M5 lamp flashing M3 lamp on and other lamps off Marker SWEEP In this mode the RF output is swept between markers 1 and M2 The lamp over the key will be on M
130. arkers Crystal Markers Frequency Sweep Modes Frequency Sweep Mode Frequency Markers 8350A Frequency Markers Frequency Markers Plug in Crystal Markers GHz Data Entry HP IB Only Functions HP IB Special Functions Instrument Preset Instrument State Intensity Crystal Markers Crystal Markers Model 8350A Operating Information Table 3 2 Functional Block Index 2 of 2 Intensity Markers 8350A Frequency Markers Internal ALC Internal Sweep Trigger Sweep Sweep Trigger Learn String HP IB Only Functions Level Power Power Control Line Sweep Trigger Sweep Sweep Trigger Local key Instrument State Manual Sweep Sweep Sweep Trigger 5 Frequency Markers Markers Crystal Crystal Markers Marker Delta Frequency Markers Marker Sweep Frequency Markers Marker Center Frequency Frequency Markers Meter ALC Millisecond Data Entry MHz Data Entry Network Analyzer Trigger HP IB Only functions Offset Frequency Sweep Mode Output Active Parameter HP IB Only Functions Power Level Power Control Power Sweep Power Control Recall n Storage Registers Power Control Save n Storage Registers Shift Data Entry Single Sweep Trigger Sweep Sweep Trigger Slope Power Control Slope Cal Power Control Square Wave LT1 Modulation Blanking Modulation Start Sweep Frequency Sweep Mode Step Size Data Entry Stop Sweep Frequency Sweep Mode Time Sweep Frequency Markers UP Step key Data Entry Vernier Frequency Sweep Mode
131. attenuator and power splitter to plug in and turn Adjust VERNIER until trace mid point in frequency sweep lies on the center line This calibrates center line of Amplitude Analyzer for Amplitude Analyzer specified maximum leveled absolute power Power Level Accuracy 12 OWEI EL key on the plug in then via the 8350A Data Entry keys enter the specified maximum leveled output power Press the START key on the 8350A Check and record that the amplitude analyzer peak to peak power variations are within the limits shown on the test record card step 12 Calibrated Range j i i 13 Press the PC C LEVEL key on the plug in then press the 8350A WF key to reduce plug in power r by dB Reduce amplitude analyzer REFERENCE LEVEL switch setting by 1 dB Check and record that peak to peak power variations are within the limits shown on test record card step 13 Repeat this step for the power levels on the test card to verify power level accuracy over the entire range 4 10 TT Model 8350A Performance Tests PERFORMANCE TESTS 4 14 OUTPUT AMPLITUDE TEST Cont d 14 Press the POWER LEVEL key on the plug in then via the 8350A Data Entry keyboard enter the maximum specified output power Switch the REFERENCE LEVEL switch to 00 dBm Maximum Internally Leveled Output Power and Variation 15 Use Power Level control t
132. ax must be supplied to auxiliary connector SINGLE Selects and or triggers or aborts single sweep LIMITATIONS CONCERNS SWEEP TRIGGER controls work only in TIME sweep mode Using the step keys with sweep time forces specific values in a 1 2 5 sequence such as 10ms 20ms 50ms 100ms etc No step value can be set for sweep time When first engaged single sweep is selected ifin a different sweep trigger mode If presently in single sweep this triggers a new sweep Figure 3 10 Sweep Sweep Trigger 1 of 2 Model 8350A Operating Information LOCAL FUNCTION PROCEDURE Data Forms Activate Step Keyboard SWEEP TYPE External SWEEP TRIGGER INT X Internal LINE External Volts Single Activates Values must end with terminator GHz MHz 5 or mS 2 step size may not be set for time 3 Each mode except TIME disables other modes limit for broad band sweeps is higher than 0 01 second Range and Resolution Range Present Sweep Width Resolution 0 01 of present sweep Range 0 01 to 100 sec Resolution 0 001 sec 2 to 5 Volts Input Key and Triggers E os REMOTE FUNCTION PROCEDURE Program Code Le Mat m x GZ x10 Sweep Type Manual SM Frequency m a HZ 901 100 0001 w us second second MS X10 Sweep Trigger i External T3
133. begins at START frequency and ends at STOP frequency The START frequency must be less than or equal to the STOP frequency The vernier and offset can be used to change the effective center frequency of the sweep Left FREQUENCY display is start frequency of sweep right FREQUENCY display is stop frequency Frequencies may be changed in three ways Frequency controls Provides continuous adjustment Clockwise rotation increases frequency Data entry Can enter specific frequency values from the number units keyboard Step up down enter step size in GHz or MHz using DATA ENTRY keyboard section By first pressing the appropriate key START or STOP and then the UP or DOWN key can now increment or decrement the appropriate frequency sweep limit If a step size has not been entered the function will change by the default value when UP or DOWN is pressed CF AF Puts display in mode where swept output is read as a center frequency and frequency sweep width Output is swept from CF AF 2 start frequency to CF AF 2 stop frequency When changing between CF AF and START STOP modes only the method of display changes the swept RF output remains the same When either CF or AF is activated the left display is center frequency CF the right display is delta frequency AF Both the CF and AF can be changed via the appropriate control number units keyboard and step size keys CW W
134. ber for complete cable i ncluding plug E Earth Ground L Line N Neutral Installation 2 13 HP IB Address Selection WARNING The address switch is set with the top cover removed from the Model 8350A and should be set only by a skilled person who is aware of the hazard in volved Prior to setting the HP IB address switch the LINE switch should be set to OFF and the power cord should be dis connected from the ac power source for maximum safety Capacitors inside the instrument may still be charged even when the instrument is disconnected from its ac power source Use caution when setting the address switch to avoid touching assemblies or compon ents within the instrument other than the address switch 2 14 When the Model 8350A is used under remote control with the HP IB the controller on the bus refers to the Model 8350A by an HP IB address The Model 8350A is differentiated from any other instrument on the bus by its own unique address This HP IB address is initially preset in Model 8350A the Model 8350A by a 5 segment address switch 881 located on the HP IB Interface assem bly as shown in Figure 2 2 A diagram of A8SI is given in Figure 2 3 Each of the 5 switches corres ponds to one of the digits of the 5 digit binary equivalent of the address as shown in Table 2 3 851 switch Al corresponds to the Least Signifi cant Bit LSB of the binary address and swit
135. bus when they have been addressed Listeners Devices which receive information sent on the bus when they have been addressed Controllers Devices that can specify thetalker and listener s for an information transfer The controller can be an active controller or a system controller The active controller is defined as the current controlling device on the bus The system controller can take control of the bus even if it is not the active controller Each system can have only one system controller even if several con trollers have system control capability 3 33 HP IB System Messages 3 34 The transfer of information via the HP IB occurs from one device to one or more devices thus consider the information to be a message There are twelve types of messages on the HP IB The following describes each ofthe HP IB System Messages a The Data Message The actual infor mation which is sent from the talkerto one or more listeners on the HP IB The informa tion or data can be numeric or a string of characters b The Trigger Message This causes the listening device s to perform a device dependent action when addressed c Clear Message This causes either the listening device s or all ofthe devices on the bus to return to a predefined device dependent state d The Remote Message This causes the listening device s to switch from local front panel control to remote program control when addressed to listen This m
136. cal transition 3 81 When the 8350A goes to local mode the front panel REM indicator turns off However the ADRS D indicator would still illuminate if the 8350A were addressed 3 82 The local message is the means by which the controller sends the Go To Local GTL bus command The front panel LCL key can also return the 8350A to local mode However pressing the LCL key might interrupt a Data message to the 8350A and this would leave the 8350 in a state unkown to the controller This situation could be avoided by sending the Local Lockout message which disables the LCL key 3 83 Receiving The Local Lockout Message 3 84 After receiving the Local Lockout message the 8350A front panel LCL key is disabled in addition to all the other front panel keys With local lockout in effect the 8350A can be returned to local only by the controller or by turning the 8350A front panel LINE switch off on 3 85 Receiving The Clear Lockout Set Local Message 3 86 8350A responds to the Clear Lockout Set Local message in the same way as to the Local message Hence it returns to local front panel control The 8350A need not be addressed to listen to receive this message 3 87 Sending The Request Service Message 3 88 The 8350A sends a Request Service message RQS whenever one of the following conditions exist and if it has been preprogrammed 17
137. ce a failure in the Address Decoder could cause a RAM error code For example if the error code indicates a failure in U7 or U8 there should at least be a short pulse in L 2 to check the first cell If there is not the problem is probably not in the RAM at all but in the Address Decoder The Free Run Test can be employed to check the Address Decoder outputs appropriate to RAM Also bear in mind that RAM has a power supply distinct from the 5 0 V supplies E010 E009 E008 E007 ROM These codes indicate ROM failures as follows E010 ROM 5 6000 7FFF 010 E009 ROM 4 8000 9FFF U35 E008 ROM 3 A000 BFFF U11 E007 ROM 12 C000 FFFF U9 The ROM Test adds together all 8K or 16K bytes in each ROM ignores the overflow and compares the result against a check sum stored in a single location If the check sum for any ROM doesn t agree the program jumps immediately back to test the first ROM again and does not test the remaining ROMs 30 Model 8350 The error code isolates the problem down to the individual ROM However a failure in the 8K Select section of the Address Decoder could also cause the error so the enabling lines L ROMI 2 through L ROMS should also be checked using the Free Run Test 006 Front Panel Bus This error code usually indicates a failure in the A2 Front Panel Interface Al Front Panel assemblies A description of the test can be found in the service section
138. ch 5 corresponds to the Most Significant Bit The HP IB address can be modified by a front panel SHIFT function 2 15 Thirty one different address codes are available decimal 0 to 30 The Model 8350A is shipped from the factory preset to binary address 10011 decimal 19 as shown in Figure 2 3 In all standard Model 8350A instruments the HP IB address will be read by the processor from the HP IB address switch 851 upon initial power on only This HP IB address will remain in effect until the address is changed by modifying the 851 switch pattern and turning the LINE switch OFF and ON or by resetting the address through the front panel SHIFT LOCAL function The HP IB address can be read directly from the front panel by pressing SHIFT LCL The current HP IB address 15 then displayed in decimal form on the FREQUENCY TIME display If the HP IB 851 SWITCH Figure 2 2 Location of 851 HP IB Address Switch Model 8350A address must be changed from that which is displayed enter the new decimal equivalent of the desired HP IB address and press GHz to termi nate the entry The FREQUENCY TIME display should now display the new HP IB address This address will remain in effect until the Model 8350A LINE switch is turned OFF When the instrument LINE switch is set to ON once again the HP IB address will revert back to the A8SI address switch setting An INSTRUMENT PRESET command will not modify the curre
139. ck to the A3 Board Refer to the Address Decoder and Instrument Bus sections of the Free Run Test description Free Run Test The Free Run Test is used to verify the A3 Microprocessor assembly This test may also be used to verify portions of the microprocessor US itself provided the power supplies power on circuits and clock circuits are functioning properly This mode of testing is useful for checking the Address Decoder the Address and Data Busses and the ROM containing self test program instructions A3UO9 The Free Run Test is initiated by setting the eight sections of SI open and connecting a jumper from L DSA TP9 to GND TP14 This isolates the microprocessor from the Data Bus so that the program codes from ROM during normal operation have no effect Instead the command Clear Register B is continuously delivered to and executed by the microprocessor In this free run mode the microprocessor repetitively cycles through every address location 0000 to FFFF in sequence 31 Model 8350 Address Bus Since the microprocessor increments through all the address locations in binary sequence the fifteen address lines should show a divide by two relationship The 0 line least significant bit toggles at half the rate of the Phase 1 and Phase 2 clocks Al toggles at half the rate of A0 2 at half that and so on to A15 the most significant bit which has a period of approximately 135 ms Check each line for activ
140. ctors The External Sweep Input must be zero volts at start of sweep increasing linearly to 10 volts at the end of sweep Sweep Output Direct coupled sawtooth zero to approximately 10 volts at front and rear panel SWEEP OUTPUT SWEEP INPUT connectors concurrent with swept RF output Zero volts at start of sweep approximately 10 volts at end of sweep regardless of sweep width In CW mode dc output is proportional to the RF plug in unit full band frequency In SHIFT CW mode a 0 to 10 volt ramp is output regardless of CW frequency MODULATION CHARACTERISTICS Internal AM Square wave modulation available at all sweep speeds Factory presetto 27 8 kHz although selectable via internal jumper to 1000 Hz or 27 8 kHz Refer to RF plug in for On Off ratio specifications INSTRUMENT CONTROL Control Knobs Step Keys and Data Entry Keyboard 1 4 instrument parameters whether time frequency or power may be set in three ways The control knobs allow for continuous adjustment of any parameter exact function value can be entered through the Data Entry Keyboard For incrementing or decrementing power or fre quency values the Step Keys Step Up Step Down can be used The step size can be entered by the user orthe pre programmed default values may be used The SHIFT key is used to effect the function written in blue on the front panel INSTRUMENT STATE STORAGE SAVE n RECALL n Up to 9 different front panel
141. d 0 00038 of band 262 144 points across Change Vernier Resolution to read Same as CW CF resolution Page 1 4 Table 1 2 Add to the end of SAVEn RECALLn All Save registers may be write protected locked by pressing SHIFT SAVEn This command makes it impossible to change the contents of the memory registers until they are unlocked by pressing SHIFT RECALLn The locked unlocked status is retained even with ac power off Page 1 5 Table 1 2 Under HP IB Functions Change Frequency Resolution to read Dependent upon Frequency Sweep Mode See Table 1 1 for the resolution of the appropriate Sweep Mode Page 1 6 Paragraph 1 19 Change the second sentence to read The Model 8350A can be used with network analyzer systems such as the HP Model 8756A Scalar Network Analyzer the HP Model 8410C Network Analyzer the HP Model 8755 Frequency Response Test Set and the HP Microwave Link Analyzers to provide a complete measurement system Page 1 7 Paragraph 1 30 Add the following after paragraph 1 30 1 30A Fine Coarse CW Control Knob Resolution 1 30B The CW control knob resolution may be increased from 0 0015 of band 16 384 points across band to 0 00038 of band 262 144 points across band by pressing SHIFT DF To return to coarse control knob resolution press SHIFT CF The resolution of HP IB entries and entries using the data entry keyboard are both 0 00038 of band Due to display resolutio
142. d correctly PROCEDURE 1 Remove the RF plug in from the sweep oscillator mainframe 2 Set the LINE switch to ON and allow the sweep oscillator to warm up for 30 minutes 3 Position the sweep oscillator upright and remove the top cover 4 Short A7TP4 and 7 5 together This removes the hysteresis from comparator A7UI 1 Refer to Figure 5 3 for the location of A7TP4 and 5 5 Replace the top cover and allow the instrument to operate with top cover in place for 5 minutes 6 Press INSTR PRESET SHIFT 0 0 1 0 0 0 M3 Thisenables the hexadecimal data in the Status Buffer at address location 1000H to be displayed on the front panel FREQUENCY TIME LEDs The LED display should now read 1000 00 or 1000 02 7 Adjust A7R58 AIRFLOW BAL until the LED display oscillates between 1000 00 and 1000 02 Refer to Figure 5 3 for A7R58 adjustment location NOTE A7R58 AIRFLOW BAL adjust pot is accessable through the hole in the left support of the RF plug in opening This adjustment MUST be made with the 8350A at normal operating temperature and all covers in place 8 Wait 1 minute after adjustment to insure that the display still oscillates If it does not and has settled at 1000 00 or 1000 02 repeat steps 6 and 7 9 Remove jumper from A7TP4 and 7 5 10 Verify that the display indicates 1000 00 NR RR 5 7 Model 8350A Adjustments ADJUSTMENTS
143. d SWP SWP 5 Fully counterclockwise RANGE Hz Best display 3 Adjust the oscilloscope with GND reference switched in for a trace on center line then reset oscilloscope to 500 input Connect the function generator output to Channel and adjust output for 100 mv peak to peak on CRT Reconnect the equipment as shown in Figure 4 17 Check GND reference on oscilloscope Return oscilloscope to 500 input Adjust CW and CW Vernier control to center trace on CRT 4 Set Oscilloscope Channel A Volts DIV to 005 CAL Adjust the oscilloscope CAL control for a four division discriminator output display on the oscilloscope 5 Vary function generator frequency from 0 1 Hz to 2 MHz Record maximum amplitude deviations of trace on the performance test record card step 5 4 22 AM ON OFF RATIO AND SQUARE WAVE SYMMETRY TEST SPECIFICATION See Performance Test Record Card in section IV of plug in manual for AM on off ratio and square wave symmetry specifications DESCRIPTION The AM ON OFF ratio is checked on the amplitude axis of a video triggered spectrum analyzer display The symmetry is checked by calculating the on off time ratio on the frequency axis Model 8350A Performance Tests PERFORMANCE TESTS 4 22 AM ON OFF RATIO AND SQUARE WAVE SYMMETRY TEST Cont d SPECTRUM ANALYZER SWEEP E RF OSCILLATOR PLUG IN
144. des the interface between the micro processor and the A2 Front Panel Interface The Instrument Bus Buffer circuit provides the interface between the microprocessor and the rest of the instrument Figure 8 24 is a flow chart of the program executed by the microprocessor When the 8350B is powered on or the INSTR PRESET key is pressed the self test routine is executed After completing this routine the microprocessor enters an idle loop The microprocessor continues in the idle loop until there is an interrupt or a status change in the front panel The cause of an interrupt request can be the HP IB Interface RF Plug in sweep retrace or Front Panel 17 Model 8350A 18 SELF TEST PROGRAM FP CHANGE OR INTERRUPT GOTO INTERRUPT PROGRAM UPDATE INSTRUMENT STATE Figure 8 24 8350 Simplified Program Routine 1 of 2 INTERRUPT PLUG IN INTERRUPT RETRACE INTERRUPT INTEGER UPDATE DISPLAY Model 8350A SERVICE SERVICE PLUG IN UPDATE INSTRUMENT STATE SET FLAG IF CHANGED Figure 8 24 85508 Simplified Program Routine 2 of 2 Model 8350A timed interrupt When the microprocessor is interrupted it completes the present instruction before jumping to the interrupt service routine this routine the microprocessor reads the Status Buffer to determine the source of the interrupt The microprocessor then jumps to a service routine to
145. difference of 41 29 percent is approximately equal to 3 dB and a difference of 18 16 percent is approximately equal to 1 5 dB OSCILLOSCOPE SWEEP RF OSCILLATOR PLUG IN FUNCTION GENERATOR 1F OUTPUT DELAY LINE DISCRIMINATOR Figure 4 17 Frequency Response Test Setup EQUIPMENT RF Plug in eee nmt HP 83500 series Any general purpose oscilloscope such HP 1222A or 1740 Function 3312 Delay Line See Figure 1 3 Add a 500 load and BNC Tee to oscilloscope Channel input PROCEDURE and 1 Connect equipment as shown in Figure 4 17 Press 8350 disengage DI C and plug in F 4 27 E X D R m Performance Tests Model 8350A PERFORMANCE TESTS 4 21 FM FREQUENCY RESPONSE TEST Cont d 2 Set controls as follows Oscilloscope p CHAN A VOLIS DIV 0 02 CAL Input Legal dete ees NEA RR E DOR 500 vs CHAN volts DIV 25 RETE 1 Function Generator RANGE HZ erc egos Gena REA ERN SN 100 FREQUENCY Vea Cem Adi ox 10 FUNCTION XD ac Asp OFFSET coq Ute ex exu ad ida ont CAL SYM aora aoaaa daos tace en de SA CAL MODULATION deterret vede dorm Po a
146. ds to the Abort message IFC true by stopping all Talker or Listener functions Table 3 8 Status Byte Information STATUS BYTE 1 SRQ on Change in Extended Status Byte Numeric Parameter Altered to Default Bit Functions not usable with 86200 Series Plug ins and 11869A Adapter 19 Operating Information 3 98 OPERATOR S MAINTENANCE 3 99 Operator s maintenance consists of replac ing defective fuses cleaning the air filter and cleaning the plug in interface connectors These items are discused in the following paragraphs 3 100 Fuses 3 101 There are twelve fuses in the 8350A Only the ac line fuse located at the back of the instrument may be replaced by the Operator The value for the ac fuse is printed on the rear panel of the instrument below the power module The value and HP part number for the ac fuse may be found in Sections II Installation and IV Replaceable Parts WARNING For continued protection against fire hazard replace only with 250 V fuses of the same current rating and type normal blow 3 102 To replace the ac fuse the Line switch should be switched off then the ac line cord removed from the power source and instrument With the line cord removed access may be gained to the fuse compartment The fuse may be removed by pulling the lever inside the fuse compartment The internal fuses should o
147. e 8350A retains the same control settings when switched from remote to local Select HP IB Address Providesa way to see and change the current HP IP address code 0 to 30 The code is displayed in the FREQUENCY TIME display INSTR PRESET The following two steps take place when instrument preset is engaged or the sweep oscillator is switched on Plug in related error E050 to E059 information is found in the plug in manual l A self test of the entire instrument is begun that takes approximately 1 seconds to complete If an error is found the test stops and an error code is displayed Section 8 has a list of error codes and failures After self test the sweep oscillator presets the controls as follows SWEEP MODE START STOP over the full frequency range of the plug in SWEEP TIME fastest allowable for plug in Markers Modulation off Marker frequency values reset to center of band Vernier Offset 0 MHz SAVE RECALL allregisters setto INSTR PRESET value if Opt 001 Non volatile memory values unchanged When using 83500 series plug ins POWER LEVEL maximum leveled value RF CW Filter on ALC MODE INT CRYSTAL MARKERS off 50MHz lamp on Figure 3 7 Instrument State 1 of 2 24 Model 8350A Operating Information REMOTE Sets Sweep Oscillator into remote HP IB operation LIMITATIONS CONCERNS Local key will not function if a Local Lockout has been implemented Allo
148. e 8350A should be set by pressing INS ESET 4 OD Setto 27 8 KHz which will set the front panel instrument state and activate the internal square wave modulation 8350A SWEEP 83500 OSCILLATOR SERIES PLUG IN 182T ooo NNNNE OSCILLOSCOPE mooo O2 EE 2 2 8750A Op aes 47052 BLANK M STORAGE NORMALIZER oooo ooo Onon 0 ALT SWP OUT E RF OUTPUT 2 ES ES ELE SWP INTERFACE NORMALIZER 8755C SWEPT INTERCONNECT AMPLITUDE ANALYZER paaa 11664A 116920 COAXIAL DUAL DIRECTIONAL COUPLER Notes on connections Either the front or rear panel SWEEP OUT IN may be used When in ALTn mode both channels 1 and 2 on 8755 must be on and receiving inputs Turn off channel 1 on the 8755C by releasing the display pushbutton Set the 8350A controls as desired On channel 2 set the function dB DIV and Offset desired for viewing the current sweep setting Set the 8350A controls as desired then store the current 8350A sweep setting in any available memory location Then turn off channel 2 by releasing its display pushbuttons Turn on Channel 1 of the 8755C and set the function dB DIV and Offset as desired Set 8350A controls as desired Turn on channel 2 Press ALTn n and the 8350A will alternate between the two settings on successive sweeps Channel 1 now displays the response due to the current f
149. e CW Control Knob resolution Save Recall memory lock Write protects the contents of all Save Recall registers Display Frequency Multiplier and Offset Allows modification of displayed frequency so the 8350A display will reflect the actual frequencies being produced by an external frequency upconverter or harmonic multiplier Faster Microprocessor operation MANUAL CHANGES FOR MODEL 8350A Changes to be made to the 8350A Operating and Service Manual in order to document the 08350 60099 Modification Kit are described under the following headings GENERAL INFORMATION OPERATION ADJUSTMENTS REPLACEABLE PARTS and SERVICE Change the 8350A Manual as listed here MANUAL CHANGES NOTE Any information regarding Option 001 are applicable to any HP 8350A equipped with a 08350 60099 Modification Kit NOTE With the addition of Battery Pack BT1 and Battery Clamp this modification kit equips the 8350A with non volatile memory Non volatile memory allows the 8350A to retain all control settings in memory when the intrument is turned off The control settings are restored when the instrument is turned on NOTE All references to 83508 the material supplied in this manual supplement are applicable to any 8350A equipped with Modification Kit 08350 60099 Model 8350A GENERAL Page 1 2 Table 1 1 Add a third paragraph to START STOP Sweeps START STOP Resolution Same as DF resolution Change CF Resolution to rea
150. e is true one an SRQ has occurred See Service Request for the conditions causing a Service Request Bit 4 indicates whether a change has occurred in the Extended Status Byte If Bit 4 is REQUEST SERVICE RQS FUNCTION N A arg 7 6 5 DECIMAL VALUE FUNCTION Airflow RF Power Failure Unleveled Failure on ms VALUE Operating Information true then the second status byte should be accessed via the Output Status function to deter mine the cause of the status change other bits indicate the present status of the noted function The bits are true one if and only if the associated function condition is true To select an SRQ fora particular set of circumstances both Status Bytes can be masked with the Service Request Mask function The mask for each byte is determined by summing the decimal values of each selected function condition that is desired The default Service Request Mask Value is 00000000 or decimal 0 See Table 3 8 for decimal values of each Status Byte bit 3 92 Sending The Status Bit Message 3 93 8350A does not respond to the Parallel Poll Enable PPE bus command and thus cannot send a Status Bit message 3 94 Receiving The Pass Control Message 3 95 The 8350A does not have the ability to take or pass control thus it cannot respond to the Pass Control message 3 96 Receiving The Abort Message 3 97 8350A respon
151. e maximum calibrated power sweep range is typically 10 dB Note that when using plug ins with Option 002 Step Attenuator the power cannot be swept across the internal attenuator switch points The procedure for performing a power sweep is 1 Afterselectingthe output frequency sweep range or swept CW mode use the power level to set the starting value for the power sweep Press the POWER SWEEP key the display will now read the dB SWP By using the POWER control data entry keyboard or step keys set the desired sweep range Press the POWER SWEEP key again to turn the power sweep off Figure 7 Plug in Controls 1 of 2 13 Local Operation Model 8350A Signal Control RF ON OFF Turns the RF power on and off CW FILTER ON OFF When on this filters the internal oscillator s tuning voltage to provide a more stable CW or MANUAL SWEEP frequency output During swept operation this filter is always disabled ALC Automatic Level Control Mode INT EXT MTR INT Provides internal leveling of output power at the output connector The 83500 series Plug in must be on INT leveling for calibrated output power EXT This setting is used when leveling with an external crystal diode detector The front panel EXT ALC input accepts negative voltages in the 25 to 250 millivolt range typically MTR Used when leveling output power with an HP 432A B C Power Meter CAL Adjusts the ALC gain so the display can be calibrated by
152. e power RECEPTACLE FOR PRIMARY POWER CORD PC SELECTOR BOARD SHOWN POSITIONED FOR 115 120 VAC POWER LINE OPERATING VOLTAGE APPEARS IN MODULE WINDOW Model 8350A cables The type of power cable plug shipped with the instrument depends upon the country of destination WARNING Before switching on this instrument be sure that only the specified power cable is used The instrument is provided with a three wire power cord which grounds the instrument cabinet This power cord Should only be inserted in a socket outlet provided with a protective earth contact This protective action should not be negated by the use of an extension cord power cable without a protective con ductor ground Grounding one conduc tor of a two conductor outlet is not suf ficient protection 2 12 Theoffset pin ofthethree prong connector is the grounding pin When operating the Model 8350A from a two contact outlet the protective grounding feature may be preserved by using a three prong to two prong adapter USA connec tors only HP Part Number 1251 0048 and connecting the green wire ofthe adapter to ground SELECTION OF OPERATING VOLTAGE SLIDE OPEN POWER MODULE COVER DOOR AND PULL FUSE PULL LEVER TO LEFT TO REMOVE FUSE PULL OUT VOLTAGE SELECTOR PC BOARD POSITION PC BOARD SO THAT VOLTAGE NEAREST ACTUAL LINE VOLTAGE LEVEL WILL APPEAR IN MODULE WINDOW PUSH BOARD BACK INTO ITS SLOT PUSH FUSE PULL LEVER INTO ITS NORMAL RIGHT HA
153. ear panel Special Plug ins Plug ins with Option HXX When using 86200 series Plug ins that have been factory modified for a non standard frequency range a PROM obtained from the factory must be used in the 11869A Adapter The PROM is inserted in the 16 pin socket on the PC board ofthe adapter and is needed for proper interfacing and controlling of a non standard plug in Model 8350A Model 8350A Local Operation m d A Um s GOA GG ouort 20008 900 1 sweer ourevr 6 sweer meur RE A exrimta e o a fo APPENDIX 3 FRONT PANEL CONTROLS SUMMARY Vernier Offset Vernier function offsets sweep ranges CW or CF frequencies 70 lamp lit when non zero offset or vernier present Right Frequency Control Adjusts AF or STOP frequency Right Frequency Display Displays STOP or AF frequency in GHz or MHz MKR A Allows user to display frequency difference between any two markers and intensifies the appropriate portion of the dis play Frequency Time Display Display Marker or manual sweep frequency in GHz or MHz Sweep Time in seconds and HP IB address Markers Controls the five independent mainframe supplied frequency markers Save n Recall n Alt n Can save and recall up to nine different settings Data Entry Keyboard Can enter exact values or step sizes for most sweep p
154. eased intensity The 8750A Storage Normalizer will need to be in BYPASS mode to view Z axis modulation on the oscilloscope Power Sweep The RF output power may be ramped up when the sweeper is in the swept or swept CW mode by using the POWER SWEEP function See Figure 10 fora gain compression display using power sweep Save and Recall This function allows the storage and recall of nine complete instrument settings GAIN dB 2 4 6 8 10 12 14 16 18 20 POWER IN dBm Figure 10 Gain Compression Display 16 Model 8350 Local Operation Figure 11 outlines the general procedure used in making a scalar transmission and reflection measurement The 11692D Dual Directional Coupler is used in the example but if a 11666A Reflectometer Bridge is available it may be used instead of the Coupler and two detectors 87555 Option 002 To keep the following procedure brief the 8750A will not be used switched to BYPASS in the procedure The following anomalies exist when using the 8750A with the 8350A Sweep Oscillator The 8350A DISPL BLANK must be engaged to ensure triggering 8750A updating Intensity markers are changed to amplitude markers In MKR A mode they appear as a level shift over the MKR A range Ifan 8755 channel is switched off the trace goes to the reference line bottom of CRT 17 Local Operation Model 8350A Example l Connect the ipment as shown i in Figure 11 Initially th
155. eater the reflected signal This reflected signal either adds to or subtracts from the incident signal This variation is displayed on the oscilloscope Model 8350A Model 8350A Performance Tests PERFORMANCE TESTS 4 18 OUTPUT VSWR TEST Cont d OSCILLOSCOPE SWEEP OSCILLATOR RF PLUG IN oQgg 7 2 oo ae maa 88888 Ook CRYSTAL DETECTOR DIRECTIONAL COUPLER 0 10 TO 2 0 GHz 500 CABLE 3 to 6 METERS 10 to 20 feet LONG Figure 4 10 Low Frequency Output VSWR Test Setup OSCILLATOR SWEEP RF OSCILLATOR PLUG IN E Y 20 AIRLINE AIRLINE ADAPTER gureUT 1j DIRECTIONAL COUPLER 1 7 0 12 4 GHz CRYSTAL DETECTOR COUPLED Performance Tests Model 8350A PERFORMANCE TESTS 4 18 OUTPUT VSWR TEST Cont d EQUIPMENT RE E Se EE ERAS HP 83500 series Oscilloscope Any general purpose such HP 1222A or 1740 Crystal Detectors s Nora x e b ERR 423B Directional couplers 0 10430 2 GU Pere ehe en da HP 778D I to LO GE S CN Nip iem Edi HP 779D Cable 0 01 to 2 GHz 3 to 6 metres 10 to 20 feet see Table 4 4 2 10 18 os exo HP 11567A 20 cm Air Lines 2 required Adapter APC 7 to
156. ed only for error codes E015 through E006 Provides front panel indication if part of front panel is operational Error code display is identical to display on the A3 Microprocessor If error code is displayed verify the same error code is displayed on the A3 Microprocessor FREQUENCY Display Used for error codes E016 and E005 through E001 Requires that the front panel is operational If error code is displayed verify the same error code 1s displayed on the A3 Microprocessor Troubleshooting With Self Tests Initial troubleshooting should begin by initiating an Instrument Preset self test and checking for error codes This self test is automatically initiated at power on or can be selected by pressing the INSTR PRESET key Depending on the results of the Instrument Preset self test proceed to the troubleshooting hints for either passing or failing this test Front Panel Display Failure Itis possible to have a front panel failure without generating an error code Initiate the Instrument Preset self test and check for any activity from the A3 Micro processorLEDs If the LEDs do notcycleon then off the Instrument Preset was not initiated Check the 5V power supply then refer to the Microprocessor service sheet If the LEDs cycle on then off this indicates that the 8350A has passed the Instrument Preset self test The front panel display problem could be caused by the A Front Panel A2 Front Panel Interface orthe RF Plug in Fron
157. ed the status byte When active low the L SBE Low Status Buffer Enable control line from the Address Decoder enables the status byte onto the data bus L SBE is active low for address locations 1000 through 17FF The microprocessor periodically reads the status byte during program execution to check the status of the two power supply status control lines as well as the Plug in and marker flags If either of the power supply status lines is active low for a certain period the microprocessor writes an error message to the front panel displays The marker flag is monitored during the Instrument Preset and operator initiated self tests The marker flag is active low when the marker circuits on the A4 Scaling and Marker assembly have passed the test routine The Plug in flag is monitored during the program idle loop and when active low indicates the Plug in requires a low priority of service ie front panel update The microprocessor also reads the status byte following an interrupt request The microprocessor uses the status byte to determine the source of the interrupt request Note that L FPIRQ is not included in the status byte If all other interrupt requests are not active the microprocessor assumes L FPIRQ caused the interrupt request The L TEST input is used for front panel troubleshooting and is active low when 20 is grounded If L TEST is active low when the microprocessor reads the status byte the microprocessor jumps to the Fr
158. el Trigger signal must be gt 2 Vdc wider than 0 5 us and not greater than 1 MHz in frequency Single Selects mode and triggers aborts a single sweep Sweep Time Continuously adjustable from 10 ms to 100 seconds Minimum sweep time may be more than 10 ms depending upon the specific RF plug in used and the bandwidth swept Manual Sweep Front panel controls knobs key board and step keys provide continuous manual adjustment frequency between end frequencies set in any of the sweep functions Resolution is 0 1 of selected sweep width 980 points across sweep External Sweep Sweep is controlled by a zero to 10 volt sweep ramp external signal applied to the front or rear panel SWEEP OUTPUT SWEEP INPUT connectors Resulting RF Output fre quency accuracy will be a function of input sweep ramp accuracy and linearity Sweep Output Positive going direct coupled saw tooth at front and rear panel SWEEP OUTPUT SWEEP INPUT connectors concurrent with swept RF output In CW mode dc output is proportional to the RF plug in unit full band frequency Refer to Table 1 2 MODULATION CHARACTERISTICS External AM Refer to RF plug in unit specifications Rear panel BNC connector Internal AM Square wave modulation available at all sweep speeds through front panel control Refer to RF plug in for On Off ratio specifications Refer to Table 1 2 for frequency characteristics External FM Refer to RF plug in unit specif
159. ements The 8756A operates in the RF and microwave frequency ranges depending on the detector used The 8756A utilizes a versatile digitized CRT and employs builtin storage and normalization features The 8756A CRT simul taneously displays swept scalar information a softkey menu channel number mode of operation scale factor and reference level information of selected channels The 8756A is equipped with advanced HP IB interfacing capabilities which allow it to display the 8350 START and STOP frequencies as well as the above mentioned information The 8756A HP IB features also allow the user to control many 8350A functions directly from the 8756A front panel The Model 8350A provides internal 27 8kHz square wave modulation of the RF output thereby eliminating the use of an external modulator OPERATION SECTION OPERATING INFORMATION Replace the OPERATING INFORMATION manual in Section III with the OPERATING INFORMATION manual from this manual supplement SECTION LOCAL OPERATION e Page 1 INTRODUCTION Under USE WITH SPECIFIC MEASUREMENT EQUIPMENT add the following to the top of the list 8756A Scalar Network Analyzer Page 6 and 7 Figure 3 Insert after description CW Coarse Fine Control Knob Resolution CW control knob resolution is coarse when CW mode is activated after an Instrument Preset command To change from coarse control knob resolution 0 001576 of band 16 384 points across band to fine
160. ency and power noted on the test card step 13 On counter rotate the SAMPLE RATE knob clockwise to HOLD press SET OFSMHZ BlueKey then rotate the SAMPLE RATE knob counter clockwise to the normal position on the Frequency Counter 14 Adjustthe adjustable short through its range while observing the frequency counter for the greatest plus and minus frequency change Check and record the sum of the maximum plus and minus frequency change on the test card step 14 15 If the Plug in is a multiband unit the test should be repeated for the other band s by repeating steps 13 and 14 forthe other frequency ies on the Plug in test card Record on test card step 15 Model 8350A Performance Tests PERFORMANCE TESTS E 4 16 RESIDUAL FM TEST SPECIFICATION See Performance Test Record Card in section IV of plug in manual for residual FM specification DESCRIPTION RFoutputsignalis displayed on a spectrum analyzer with the option of direct readings using the modulation analyzer Without the modulation analyzer the residual FM is observed on the storage display by displaying five superimposed traces MODULATION ANALYZER SWEEP SPECTRUM ANALYZER OSCILLATOR RF PLUG IN f 21 4 MHz OUTPUT corno 0000900 8 00000 0 D 1 3097990 20 dB ATTENUATOR LEA Figure 4 7 Residual FM Test Setup EQUIPMENT NOTE The modulation analyzer listed below is not required
161. ent Preset is indicated by yellow LEDs located above the selected operation pushbuttons In this mode the Model 8350A sweeps up from the START frequency to the STOP frequency START and STOP frequencies are indicated on the FREQUENCY LED dis plays START frequency or STOP frequency may then be changed through the use of the data entry controls 1 29 CW Mode 1 30 When CW Continuous Wave mode is selected the instrument is tuned to a single General Information frequency RF Output indicated on the FRE QUENCY LED display CW mode operation is indicated by the yellow LED located above the CW pushbutton CW frequency when enabled may be varied through the use of the data entry controls When the SHIFT CW mode is selected a 0 to 10 volt sweep ramp will be output at the front and rear panel SWEEP OUTPUT SWEEP IN PUT BNC connectors even though the RF frequency is fixed in the CW mode 1 31 CF AF Mode 1 32 The CF AF frequency sweep mode allows the instrument to sweep upward in frequency symmetrically centered about a CF Center Fre quency setting CF AF sweep mode operation is indicated by the yellow LEDs centered above the CF and AF pushbuttons CF and AF frequencies may be individually varied through use of the data entry controls START STOP and CF AF sweep modes may be interchanged without affecting the RF Output When changing between CF AF sweep mode and CW mode the CW frequency and the Center Frequency CF are
162. ent value is out of the present sweep frequency range will be reassigned the value of the present effective center frequency when the FREQUENCY TIME knob is first turned If no markers are presently active when entering MKR A Markers 1 and2 are assumed the active and previously active markers respectively If Marker 1 frequency is higher than Marker2 frequency then these values are permanently interchanged in Marker Sweep mode Start and Stop values are modified to correspond to the new center frequency and old sweep width in Likewise the A Frequency Span and Start Stop may be modified so that the new frequency sweep is within the frequency range of the plug in If no marker is presently active the previously active marker is assumed At power on Marker 1 is assumed to be the active marker If Marker 1 and or Marker2 are noton when entering Marker Sweep mode they are turned on and their previous values used At power on all markers are assigned the value of the effective center frequency of the plug in frequency range If sweep width is out of range when gt is engaged it will automatically scale down the A Frequency to be within plug in frequency range The plug in and markers have the capability of 2 percent frequency overrange if this occurs a flickering of the GHz or MHz indicators will occur Figure 3 8 Frequency Markers Sweep Time Marker Transfer 2 of 4 Operating Information 21
163. entifying a device dependent condition This bit is typically sent by devices in response to a parallel poll operation by a controller k Pass Control Message This trans fers the bus management responsibilities from the active controller to another controller 1 Abort Message The system con troller sends this message to unconditionally assume control of the bus This message terminates all bus communications but does not implement the Clear message This message can also be used by a controller to specify the particular bit and logic level that a device will respond with when a parallel poll operation is performed Thus more than one device can respond on the same bit A summary of the twelve bus messages their related commands and mnemonics are pro vided in Table 3 4 11 i i i i Operating Information Model 8350A HP iB Appli Message cahle Table 3 4 Twelve Bus Messages 1 of 2 Sample Statements Message Type HPL BASIC 9825 9835 9845 85 8350A Response Interface Function Related Comments T6 Input Data I4 5 1 Output Data System Trigger Input data controls all front panel functions except the Line switch plus special HP IB only functions Output data includes information as to present instrument state values of selected functi
164. equivalent 1 33 Frequency Marker Operation 1 34 Five independent continuously variable amplitude or intensity markers are available to note significant points on the frequency sweep Marker selection is indicated by a yellow LED located within each Marker pushbutton Marker frequency is indicated on the FREQUENCY TIME LED display The frequency difference between any two markers can be displayed by the MKRA function A MKR SWEEP function allows a frequency sweep using Marker 1 and Marker 2 as the START STOP frequency limits while maintaining the original START STOP values For greater accuracy marker frequencies can also be counted directly using the HP Model 5343A Microwave Frequency Counter The sweep is momentarily stopped allowing the counter to measure the START STOP or activated marker frequency 1 35 Instrument State Storage 1 36 Up to9 different front panel settings can be stored and recalled in the Model 8350A via the SAVE n n 1 through 9 function The ALT n function causes the RF Output to alternate on successive sweeps between the current front panel setting and the setting stored in the recalled memory location n 1 through 9 This allows the 1 7 General Information Model 8350A to work in conjunction with the HP Model 8755 Frequency Response Test Set to allow two different measurements to be made simul taneously by utilizing two different sweep widths and or power levels 1 37 Modulation Characte
165. er with a numeric value The function reduces the amount of time involved in programming the 8350A numerically related parameters ie CW Frequency and aids in producing faster stepped CW frequency sweeps The default at power on and Instrument Preset is the Display Update On state When in the Display Update Off state the 8350A numeric displays will be blanked FM SENSITIVITY 83500 Series Plug ins Only This selects the External FM Input sensitivity of C20 MHz per volt or 6 MHz per volt This function is normally selected with an internal plug in switch but can be overriden via the HP IB Note that the FM sensitivity is reset to the switch position after an Instrument Preset is executed Thus the user should select the desired sensitivity after every Instrument Preset LIMITATIONS CONCERNS 1 When using the Micro Learn String both Input and Output the 8350A must be in the CW mode and the plug in CW Filter capacitor should be off You must exit the Input Micro Learn String mode with the code only The numeric displays will still be blanked until the appropriate functions are re activated Figure 3 17 HP IB Only Functions 3 of 7 47 Operating Information Model 8350A Learn String and Micro Learn String characters must be retained and re input to the 8350 If the 8350A does not receive the expected number of characters it will undergo an Instrument Preset The valid functions for the Output I
166. es Installation instructions are also given in Figure 2 11 Additional Option 909 Kits may be ordered as HP Part Number 5061 0083 2 48 Battery Operation Option 001 2 49 Instruments with Option 001 contain a battery pack inserted in the battery holder with a battery hold down clamp and a modified A3 Microprocessor board With Option 001 installed the instrument has a nonvolatile memory which retains the contents of all instrument state storage registers the current instrument state and the HP IB address When shipped from the factory the batteries are fully charged The batteries will retain a sufficient charge to hold the memory contents for approximately 20 days from the date at which they were fully charged The batteries are charged within the instrument and a full charge is maintained at all times when the instrument LINE switch remains ON The batteries do not charge when the instrument LINE switch is OFF When fully discharged the batteries will typically take approximately 33 hours to obtain a full charge Allow the instrument to be on for at least 24 hours when new or when the instrument has been turned off for a sufficiently long enough period of time that the batteries might have become discharged to a level where memory contents may have been lost Additional Option 001 Battery Kits may be ordered for the Model 8350A to upgrade a standard instrument to an Option 001 instrument by ordering HP Part Number 08350 60013 T
167. essage remains in effect so that devices subse quently addressed to listen will go into remote operation The Local Message This clears the remote message from listening device s and returns the device s to local front panel control Operating Information f Local Lockout Message This prevents the user of a device from manually inhibiting remote program control g The Clear Lockout Set Local Message This causes all devices on the bus to be removed from local lockout and revert to local This message also clears the remote message for all devices on the bus h The Require Service Message A device can send this message at any time to signify that the device needs some type of interaction with a controller The message is cleared by sending the device s Status Byte message if the device no longer needs service i The Status Byte Message byte that represents the status of a single device on the bus Within this byte the seventh most significant bit bit 6 of bits 0 through 7 indicates whether the device has sent a Require Service message The remaining bits indicate the present operational conditions defined by the device This byte is sent from a talking device in response to a serial poll operation performed by a controller j Status Bit Message A byte that represents the operational conditions of a group of devices on the bus Each device responds on a particular bit of the byte thus id
168. evel to provide an accurate reference voltage for all Digital to Analog Converters DACS in the 8350A mainframe DIGITAL VOLTMETER SWEEP OSCILLATOR MTP7 TOAdPM 999 GND ANLG 10 REF BARON SPECIOSA 2 WIRE Figure 5 6 10V REF DAC Power Supply Adjustment Setup EQUIPMENT Sweep HP 8350A Digital Voltmeter HP 3455A PROCEDURE 1 Remove the RF plug in from the sweep oscillator mainframe 2 Set the LINE switch to ON and allow the sweep oscillator to warm up for 30 minutes 3 Position the sweep oscillator upright as shown in Figure 5 6 and remove the top cover and the 4 5 shield cover 4 Connect the DVM to 4 14 10 REF and A4TP7 GND ANLG as shown in Figure 5 6 5 Adjust 4859 10V REF ADJ fora DVM reading of 10 0000 0 0001 Vdc Refer to Figure 5 7 for location of adjustment 5 11 Model 8350A 5 12 p E s Bu m gt 2 3 o 2 gt cI i I iu e a ul UE 22 O sc 6 gt gt 9 56 o ecu c Y 39 ES E azu 2 o eq es 0 gt vz 50 eRe O gt 24 co a a lt 8 Ry lt a 7 ud 0 85 lt 2 gt x N 5 2 g 3 EZ EA 3 lt 2 1995 E
169. face Cables and their part numbers is given in Figure 2 6 As many as 15 instruments can be connected in parallel on the HP IB Interface Bus To achieve design performance on the bus proper voltage levels and timing relationships must be main tained If the system cable is too long or if the accumulated cable length between instruments is too long the data and control lines cannot be driven properly and the system may fail to perform Therefore the following restrictions must be observed a With two instruments a system the cable length must not exceed 4 meters 12 feet b When more than two instruments are con nected on the bus the cable length to each instrument must not exceed 2 meters 6 feet per unit The total cable length between all units cannot exceed 20 meters 65 feet HP IB Cable 1 m 3 3 ft 2 m 6 6 ft 4 m 132ft 0 5 m 1 6 ft HP 10833A HP 10833B HP 10833C HP 10833D Figure 2 6 HP IB Interface Cables Available 2 8 Model 8350A Installation Table 2 4 Model 8350 Mating Connectors 8350A Connector Mating Connector Industry Identification HP Part Number SWEEP OUTPUT 1251 0256 Specialty Connector SWEEP INPUT 25 P118 1 front panel J4 HP IB INTERFACE BUS 24 Pin Micro Ribbon 1251 0293 Amphenol 57 30240 J5 POS 2 BLANK BNC 1250 0256 Specialty Connector 25 118 1 1250 0256 26 NEG Z BLANK BNC Specialty Connector 25 P118 1 J7 PEN LIFT BNC 1250 025
170. for output amplitude specifications DESCRIPTION A Power Meter is used to check maximum power and power variations in power meter leveling A Swept Amplitude Analyzer is used to check power variations at maximum leveled power internally leveled power level accuracy and power sweep Performance Tests 1 8350 PERFORMANCE TESTS 4 14 OUTPUT AMPLITUDE TEST Cont d SWEPT AMPLITUDE SWEEP OSCILLATOR ANALYZER DISPLAY RF PLUG IN 052 SWEEP OUT IN BERE SENA o 660 SPLITTER Figure 4 3 Output Amplitude Test Setup EQUIPMENT NOTE Storage Normalizer 8750 is not available use a grease pencil to record the detector response on the CRT rir tr ya du Na ius HP 83500 series Power Melet ssa ant at ife Fe an d HP 432A Thermistor Mount Pee eee Te HM Di HP 8478B Oscilloscope edie wha dees es HP 182T Swept Amplitude Analyzer HP 8755C Detector ee au a s HP 11664A Power Splitter ee oan cece baste ERN EA pr cake cess HP 11667A 3 dB HP 8491B Opt 003 2 8750 PROCEDURE NOTE If oscilloscope will not synchronize on CRT it may be due to the MOD frequency being set to 1 kHz To change the frequency to 27 8 kHz referto section VII
171. for those assemblies However it is possible that a failure in one of the Front Panel Bus Buffer U22 or U32 can cause this error code U32 is an inverting buffer that is always enabled therefore the output of each buffer should be the complement of its input U22 is a 3 state bi directional buffer Check the L WRITE 5 and L TP6 lines for activity and ensure that identical data appears on both the input and output sides of the buffer when the L FPE is active low The Free Run Test can be used to check Front Panel Bus problems related to the A3 Microprocessor Refer to the Address Decoder and Front Panel Bus sections of the Free Run Test descripion 005 instrument Bus This error code indicates a problem in the Instrument Bus using the Self Test hardware locaied on the A8 HP IB assembly A full description of the test is contained in the service section for that assembly However the error code could also be produced by faulty Instrument Bus buffers on the Microprocessor U26 is an inverting buffer that is always enabled hence inputs and outputs should be complements of each other U27 and U28 are inverting 3 state buffers When enabled by L IBE outputs should be complements of the inputs 25 is a bi directional 3 state buffer enabled by L and controlled by L WRITE When enabled inputs and outputs should be identical The Free Run Test can again be employed to isolate Instrument Bus errors traced ba
172. h Number Related Assemblies None None None None 5 14 5 16 5 19 5 20 5 14 5 15 5 16 5 17 5 18 5 11 5 12 5 13 5 11 5 12 5 13 Table 5 5 Adjustments 20V 40V and 10V POWER SUPPLY ADJUSTMENTS AIRFLOW DETECTOR ADJUSTMENT 5VB POWER SUPPLY ADJUSTMENT 10V REF DAC POWER SUPPLY ADJUSTMENT SWEEP TIME ADJUSTMENTS MANUAL SWEEP ADJUSTMENT SWEEP RETRACE TIME ADJUSTMENTS 28 8 1 kHz OSCILLATOR ADJUSTMENT FREQUENCY CONTROL ADJUSTMENTS MARKER DAC ADJUSTMENT ADJUSTMENTS 5 11 20 40V AND 10V POWER SUPPLY ADJUSTMENTS Model 8350A Adjustments ADJUSTMENTS 5 11 20V 40V and 10V POWER SUPPLY ADJUSTMENTS Cont d DIGITAL VOLTMETER RF PLUG IN 2 WIRE SWEEP OSCILLATOR Figure 5 1 20V 40V 10V Power Supply Adjustments Setup EQUIPMENT Sweep Oscillator c tt HP 8350A any HP 83500 Series RF Plug in or HP 11869A RF Plug in Adapter Digital Voltmeter DVM ee HP 3455A PROCEDURE 1 Install an HP 83500 Series RF plug in or the HP 11869A RF Plug in Adapter in the HP 8350A mainframe 2 Set LINE switch to ON and allow the sweep oscillator to warm up for 30 minutes 3 Position the sweep oscillator on its side as shown in Figure 5 1 and remove the top and bottom covers 4 Connect the DVM to the bottom of the A9 Motherboard connector A9J2 pin 7 20V RETURN SENSE and A9J2 pin 6 20V SENSE
173. h RAM can store IK by 4 bits two RAMs are combined to form a by 8 bit memory space The two pair of RAMs combine to form a 2K by 8 bit memory space One RAM in each pair U7 and U14 store the low order four bits 20 03 of the data bus and the high order bits 24 07 are stored by the other RAM in each pair U8 and U15 014 and UIS store the first of data and are enabled when control line L RAMI Low RAM Enable 1 is active low L RAMI is active low for address locations 0000 to 03FF U7 and US store the second 1K bytes of data and are enabled when control line L 2 is active low L RAM2 is active low for address locations 0400 to 07FF The logic level of the L WRITE signal for each RAM determines if data is written to the RAM or the data stored is read by the microprocessor When L WRITE is active low the microprocessor writes data into the addressed RAM location When L WRITE is active high the microprocessor reads data from the addressed RAM location All four RAM power supply connections are to which is the battery backup supply Front Panel Bus Buffer Q The Front Panel Bus Buffer circuit provides the interface for the address data and control lines between the microprocessor and the Front Panel Bus The Front Panel Bus is used to transfer data between Front Panel circuits and the A3 Microprocessor Assembly Bi directional buffer U22 is a 3 state device that provides the interface for the eight front pane
174. hen activated causes the 8350A to output a constant frequency The value ofthe CW frequency is displayed on left FREQUENCY display The CW frequency is the same as the center frequency CF of the previous swept range The CW frequency value can be changed using the Figure 3 Frequency Controls 1 of 2 Model 8350A Local Operation control data entry keyboard or step keys In CW mode the SWEEP OUT voltage is equal to percent of full band Pressing SHIFT CW enters a swept CW mode with the SWEEP OUT being a0 to 10 volt ramp that results in the display trace being a flat horizontal line This is often useful when reading values e g dB of attenuation from a CRT screen when ata CW frequency FREQUENCY VERNIER The effective center frequency of any mode CW or swept may be adjusted with high resolution up to 0 05 of the frequency band being used with the vernier Pressing the VERNIER key activates the function and sets the left FREQUENCY display to read the vernier value in MHz 1 40 light is on whenever a frequency vernier or frequency offset is present in any mode After setting vernier to return to the previous mode press the appropriate key e g START CF etc and the display will return to reading the appropriate frequencies and the 7 0 lamp will be lit Frequency vernier can be set by the control data entry keyboard or step keys
175. his Option 001 Battery Kit contains a battery pack a battery pack hold down clamp and a special A3 Microprocessor board All other necessary wiring and hardware con nections have been made at the factory on all standard instruments Refer to Section VI Re placeable Parts in this manual for information and part numbers required to order individual battery packs 2 50 STORAGE AND SHIPMENT 2 51 Environment 2 52 The instrument may be stored or shipped in environments within the following limits 2 18 8350 Temperature 40 C to 75 C Humidity 596 to 95 relative at 0 to 40 Altitude Up to 15240 meters approximately 50 000 feet 2 53 The instrument should also be protected from temperature extremes which may cause condensation in the instrument 2 b4 Packaging 2 55 Original Packaging Containers and materials identical to those used in factory pack aging are available through Hewlett Packard offices complete diagram and listing of pack aging materials used for the Model 8350A is shown in Figure 2 12 Prior to shipping in the factory packaging materials the shipping bars should replace the front handles or rack mount flanges as shown in Figure 2 13 to hold the instrument securely in the packaging material If the instrument is being returned to Hewlett Packard for servicing attach a tag indicating the type of service required return address model number and full se
176. ic diagram and in the replaceable parts list HP Part Numbers for selected values are given in Table 5 3 Check Digit information is given as an ordering convenience 5 9 RELATED ADJUSTMENTS 5 10 Interactive adjustments are noted in the adjustment procedures Table 5 4 indicates by paragraph numbers the adjustments that must be performed if an assembly has been repaired or replaced or if an adjustment has been made on an assembly Table 5 5 lists the adjustment pro cedures included in this section 5 1 Adjustments Model 8350A Table 5 1 Adjustable Components Reference Adjustment Adjustment Designation Name Paragraph Description AF OFFSET Sets low end of band frequency accuracy OFFSET in AF sweep mode Sets frequency accuracy GAIN in AF sweep mode for AF settings 1 8 and 21 64 of RF plug in band Sets frequency accuracy GAIN in AF sweep mode for AF settings lt 1 64 of RF plug in band VERNIER Sets symmetry GAIN of VERNIER control at low end of VERNIER range AF1 Sets high end of band frequency accuracy GAIN in AF sweep mode for AF settings 21 8 of RF plug in band CW Sets frequency accuracy GAIN in CW sweep mode Sets marker frequency accuracy GAIN CW OFFSET Sets symmetry OFFSET of VERNIER at high end of VERNIER range 10V REF Adjusts 10V REF DAC power supply 10 mSEC Sets sweep time accuracy for sweep times lt 1 second 1 SEC Sets s
177. ications Rear panel BNC connector GENERAL SPECIFICATIONS Blanking RF Blanking When enabled RF automatically is turned off during retrace and remains off until the start of next sweep Display Blanking POS Z BLANK direct coupled positive rectangular pulse during retrace and bandswitch points of sweep Negative intensity marker signals are also output through this connector NEG Z BLANK direct coupled negative rectangular pulse during retrace and bandswitch points of sweep Both are rear panel outputs Refer to Table 1 2 Pen Lift Output to control the pen lift function of an X Y recorder Refer to Table 1 2 for maximum sink current rating Counter Trigger CNTR TRIG Output for controlling the external trigger input of the HP 5343A Microwave Frequency Counter Rear panel BNC connector Stop Sweep Input for stopping the progress of a forward sweep Rear panel BNC connector General Information Model 8350A Table 1 2 Model 8350A Supplemental Characteristics 1 of 2 SUPPLEMENTAL CHARACTERISTICS 8350A SWEEP OSCILLATOR with RF Plug in installed INPUT OUTPUT SIGNAL CHARACTERISTICS Frequency Marker Output Rectangular pulse typi cally 5 volts peak available from the POS Z BLANK connector on the rear panel Source impedance is approximately 1000 ohms External Sweep Sweep is controlled by an External Sweep Input signal applied to the front or rear panel SWEEP OUTPUT SWEEP INPUT con ne
178. ing Information scription of the HP IB and defines the terms concepts and messages used in an HP IB system 3 23 For more information about the HP IB refer to any of the following documents IEEE Interface Standard 488 1975 ANSI Interface Standard MC1 1 Improving Measurements in Engineering and Manufacturing HP Part No 5952 0058 Condensed Description of the Hewlett Packard Interface Bus HP Part No 59401 90030 3 24 General HP IB Description 3 25 The HP IB is a parallel bus of 16 active signal lines grouped into three sets according to function to interconnect up to 15 instruments Figure 3 5 is a diagram of the interface connec tions and bus structure Table 3 3 defines the function of each signal line Table 3 3 The Bus Signals Data Input Output Data Valid Not Ready for Data Not Data Accepted Attention Interface Clear Service Request Remote Enable End Or Identify The eight data lines for the byte of data Indicates the data lines have a valid byte of data Indicates that the listening devices are not ready to accept further data Indicates that the listening devices have not completely accepted the present byte of data Enables a device to interpret data on the bus as a controller command command mode or data transfer data mode Initializes the HP IB system to an idle state no activity on the bus Alerts the controller to a need for communication Places in
179. ins the contents of all instrument state storage registers and the HP IB address along with the current instrument state when the ac power is turned off for approximately 20 days Display Blanking Outputs POS Z BLANK Direct coupled rectangular pulse approximately 5 volts during retrace and bandswitch points of sweep Intensity marker signals are also output through this rear panel BNC connector Marker signals are 4 volt pulses with the exception of the active marker which is 8 volts NEG Z BLANK Direct coupled rectangular pulse approximately 5 volts during retrace and bandswitch points of sweep No markers are output from this rear panel BNC connector Pen Lift Output Output to control the pen lift function of an X Y recorder Maximum sink current is approximately 600ma Rear Panel Programming Connector Additional control of and information on the 8350A instrument state is provided via a 25 pin rear panel connector Output signals such as display and RF blanking X Y recorder pen lift HP 8410B and HP 5343A interface signals Input signals affect the sweep status display and RF blanking pen lift outputs etc Refer to Figure 2 7 for a complete listing of signals and voltages on the rear panel Pro gramming Connector 84108 Interface Cable Permits multi octave opera tion of HP 8410B Network Analyzer with the 8350A order HP Part Number 08410 60146 Connects between 8410B rear panel SOURCE CONTROL and 8350A
180. int where both triggering LEDs blink NOTE The setting of the 5328 triggering controls is critical for an accurate time interval measurement Adjust ASR2 10 mSEC ADJ for a counter reading of 10 000 0 020 ms Refer to Figure 5 9 for location of adjustment Press Adjust ASR25 1 SEC ADJ for a counter reading of 1000 5 ms Refer to Figure 5 9 for location of adjustment Model 8350A Model 8350A Adjustments ADJUSTMENTS 5 15 SWEEP TIME ADJUSTMENTS Cont d AB SWEEP GENERATOR 5 ASR2 A5R25 10 mSEC ADJ 1 SEC ADJ NU 2 E Q Rse o 9550 GRI O uo o n 9 5 0 e 9 27 7 goto e 8 Ug 25 9 0 9 C5 E ais 913 g un e a 00000000000000000 i Figure 5 9 Location of Sweep Time Adjustments 5 15 Adjustments M ADJUSTMENTS 5 16 MANUAL SWEEP ADJUSTMENT i 5 16 REFERENCE A4 Scaling and Marker 5 Sweep Generator DESCRIPTION ASR43 MANUAL sweep adjust sets the gain of sweep ramp generator output amplifier ASU3 when operating in a linear mode during MANUAL SWEEP The adjustment is made with the A5 Sweep Generator sweep ramp DAC ASU2 at the high end of its range so that the upper limit of the manual sweep voltage is the same as the 10V clamped level which limits normal sweeps The output is monitored at A4TP11 VTUNE which is the poin
181. ion accuracy for AF sweeps in this range The AF sweep range is narrowed again to 162 4 MHz just below the switch point at 162 5 MHz where the resolution scaling of the A4 AF Generation circuits changes to lt 1 64 band range A4R18 is then adjusted to calibrate bs the resolution accuracy in the narrowest AF sweep range e SWEEP OSCILLATOR DIGITAL VOLTMETER TO A4TP7 GND ANLG TO MTP11 ae VTUNE MMC MEI C wow X FON 2 WIRE Figure 5 16 Frequency Control Adjustments Setup EQUIPMENT 8350 Digital Voltmeter HP 3455A PROCEDURE 1 Remove the RF plug in fron the sweep oscillator mainframe 2 Position the sweep oscillator upright as shown in Figure 5 16 and remove the top cover 3 Setthe LINE switch to ON and allow the sweep oscillator to warm up for 30 minutes 5 24 Model 8350A Adjustments ADJUSTMENTS 5 19 FREQUENCY CONTROL ADJUSTMENTS Cont d VERNIER Calibration NOTE The validity of this adjustment procedure is based in part on the accuracy of the 10V REF DAC power supply Proper adjustment of the 4 10 REF DAC power supply is necessary before proceeding with this adjustment procedure 4 Connect the DVM to A4TP11 VTUNE and A4TP7 GND ANLG 5 Press INSTR PRESET CW 2 0 0 MHz Hz This sets the sweep ramp circuits at the start of sweep 26 Press SHIF
182. ion generator output to 8350 FM INPUT rear panel and adjust oscilloscope for a clear display of the function generator sinewave Increase the function generator output amplitude until the deviation becomes non symmetrical or distorted Use oscilloscope B input to monitor function generator output If the output is offset the test 1s invalid Mark peak of sinewave on oscilloscope with grease pencil Remove function generator output from FM INPUT and adjust CW CW VERNIER to the grease pencil mark Calculate the difference between the present frequency counter reading and the previous reading step 6 Record on the test card step 9 Set the function generator to 2 MHz then 10 MHz repeating steps 6 through 9 for each frequency and record the results on the test card step 10 Change mode of plug in modulation coupling and repeat steps 6 through 10 Record the results on the test card step 11 Model 8350A Model 8350A Performance Tests PERFORMANCE TESTS 6 4 21 FM FREQUENCY RESPONSE TEST SPECIFICATION See Performance Test Record Card in section IV of plug in manual for FM Response specifications DESCRIPTION FM deviation of the RF Plug in is compared to a known voltage reference using a delay line discriminator and the difference is measured with an oscilloscope Since the oscilloscope is calibrated so that four major divisions are equal to 100 percent each minor division is equal to 5 percent A
183. ity Any line locked high or low could be caused by a faulty microprocessor output shorted or opened bus lines or a faulty input at an address line termination If the divide by two relationship between two adjacent lines is not observed these lines may be shorted together Address Decoding the address lines are sequenced through their range the various I O Ports RAMs and ROMs are selected in turn by the Address Decoder circuitry The proper location and duration of these pulses in relation to the 15 line is shown in the Address Decoder Timing Diagram below These can be checked on a dual trace oscilloscpe by using a 20 ms div sweep speed while triggering off the falling edge of the A15 line TP12 has been provided to disable the line controlling the Address Decoder When 12 is connected to Ground TP14 all the enabling outputs from the Address Decoder should go high Data Bus Since every possible I O port and memory location is addressed while the microprocessor is in the free run mode each of the data lines DO through D7 should show some activity TP12 can be connected to GND to disable all ROM RAM and I O outputs In this condition none of the 3 state drivers are enabled and the Data Bus can be driven by an outside source L A10 TP11 is a convenient square wave source while the microprocessor is in the Free Run Test Connect TP12 to TP14 DIG GND and drive each of the data lines DO through D7 in turn at J3
184. ker designated by the talk address The system controller may designate itself as either talker or listener 3 38 Table 3 5 lists all the possible talk and listen addresses on the bus The device address is Comments Semple Statements Statements Interface Message Function Type HPL p 9825 p 9845 85 INS Status The 8350A does not respond to Bit a Paralell Poll Ab Responds by terminating all ort Listener or Talker functions di 7 ABORT TO 7 STATUS 719 A or A S POLL 719 typically set via five binary bits which are the same for both listen and talk addresses with the sixth and seventh bits used to determine when the address is listen bits are 0 1 or talk bits are 1 0 Some controllers distinguish between listen and talk automatically requiring only the 5 bit code equivalent to designate a device 3 39 8350A HP IB MESSAGE RESPONSES 3 40 The 8350A responds to the twelve bus messages as shown in Table 3 4 3 41 8350 Compatibility 3 42 Table 3 6 lists the 8350A Sweep Oscillators HP IB capability which are compatible with IEEE Standard 488 1975 13 Operating Information Model 8350A Table 3 5 Possible HP IP Addresses Characters Address Code Equivalent Talk Binary Decimal Address 54321 NO 00 tA PB UN O NuExXxzdHumHWo uozzzutme 9 mommouou g pee ee ee
185. l A correction factor of 9 dB is added because of the RMS voltmeter response to a square wave and the square law response of the crystal detector _ 4 23 Performance Tests 4 24 PERFORMANCE TESTS 4 19 RESIDUAL AM Cont d 3 4 Enter frequency and power shown on test card step 3 Vary attenuation using 3 dB 6 dB and 10 dB attenuators until reading on RMS voltmeter is 28 dB 3 dB Note voltmeter reading Disengage MOD Change RMS voltmeter range switch to obtain an on scale indication Calculate the difference between this reading and the indication noted in step 4 Add 9 dB to compensate for square law inequities and record this number on the test record card step 5 Engage Lf MOD If plug in is a multiband unit repeat steps 4 and 5 for frequency ies shown on test card step 6 4 20 EXTERNAL FREQUENCY MODULATION TEST SPECIFICATION See Performance Test Record Card in section IV of plug in manual for External FM deviation specifications DESCRIPTION The RF Output is modulated with an external signal at 100 Hz 1 MHz 2 MHz and 10 MHz The 100 Hz deviation is measured directly on a spectrum analyzer The deviation at the higher frequencies is found by using a delay line discriminator to observe an increase in the modulation on an osci
186. l data lines FPDO FPD7 Transfer of data through U22 is enabled when control line L FPE Low Front Panel Enable is active low L FPE is active low for microprocessor addresses 1800 through 1FFF Direction of data flow is determined by the logic state of the microprocessor L WRITE signal This signal is high when reading data from the front panel and is low when writing data to the front panel 3 state buffer U32 drives the five address lines FPA0 FPAA and three control lines FPE L FPRD and L FPSTB associated with the Front Panel Bus U32 is always enabled The front panel uses the address lines to select the source destination of information on the data lines The control lines manage the data flow A more detailed functional description of these lines is provided in the A2 Front Panel Interface circuit description Interrupt Logic and Status Buffer The Interrupt Logic and Status Buffer circuit performs the following functions ORs the following inierrupt request signals onto the microproccssor maskable interrupt request control input L IRQ Low Interrupt Request L PIIRQ Low Plug in Interrupt Request Model 8350A IBIRQ Low Interrupt Request L FPIRQ Low Front Panel Interrupt Request L FPIRQ also goes active low when there is L RTCIRQ Low Retrace Interrupt Request So there is no need to multiplex L RTCIRQ to develop a L IRQ input to the microprocessor Buffer the L
187. lat leveled output power at output of device cable by increasing the output power at higher frequencies UNLEVELED Light Light is on when all or portion of sweep is unleveled POWER Display Provides digital display of Power Level and Power Sweep toatenthofadB and Slope to 0 01 dB The units for power level are dBm for power sweep dB and for slope it is dB GHz Figure 3 13 Power Control 83500 series Plug ins 1 of 2 38 Model 8350A Operating Information LIMITATIONS CONCERNS Power level control is calibrated over a 10 dB range typically 15 dB Power Level range up to 80 dB with plug in Option 001 70 dB Step Attenuator The total combined Slope and Power Sweep range is 15 dB Power Sweep will not cross a Step Attenuator boundary Power Sweep and Slope values may not be negative LOCAL FUNCTION PROCEDURE Range and Keyboard Resolution See plug in Resolution 0 024 dB 1 Values must end with terminator dBm or dB REMOTE FUNCTION PROCEDURE Program Code Cue Rein 25 5 dB DM X1 dBm Power X1 5 dB GHz Figure 3 13 Power Control 83500 series Plug ins 2 of 2 39 Operating Information 40 Signal Control DESCRIPTION This function block controls the signal purity and switches the signal RF off or on The CW Filter when enabled reduces the oscillator tuning voltage noise and hence Residual FM The CW Filter is inacti
188. lloscope until distortion is observed This frequency change is measured on a frequency counter SWEEP RF OSCILLATOR PLUGIN SPECTRUM ANALYZER FUNCTION GENERATOR Figure 4 15 100 Hz External Frequency Modulation Test Setup Model 8350A Model 8350A Performance Tests PERFORMANCE TESTS aaa 4 20 EXTERNAL FREQUENCY MODULATION TEST Cont d EQUIPMENT RE Plug esc yee enews wie ass HP 83500 series Spectrum Analyzer HP 8565A Frequency HP 5343A Function HP 3312A Any general purpose oscilloscope such as HP 1222A or 1740 10 dB HP 8491B Opt 010 Power Splitter 3 tesa sed Roma Rn e IER EE ses es HP 11667 Delay Line See Figure 1 3 Add 500 load and BNC Tee to each oscilloscope input PROCEDURE 100 Hz Modulation 1 Ensure that modulation sensitivity is setto 20 MHz volt and modulation coupling to DC Refer to section III of the plug in manual for information on FM switch position Connect equipment as shown in Figure 4 15 2 Press 8350 INST ESET CW SPL BLANK key Disengage RF plug in CW FILTER key Center fundamental signal on spectrum analyzer CRT display Set function generator frequency to 100 Hz sinewave
189. mal position The counter is now indicating frequency change gt clockwise back with time 7 Wait 10 minutes while observing frequency count for maximum frequency change and record this maximum change on the performance test record card step 7 8 IfthePlug inisa multiband unit repeat steps 6 and7 for the other frequencies shown on the test card Frequency Change With 10 dB Power Level Change 9 Setoutput power and CW frequency as indicated on test record card step 9 4 13 Model 8350A Performance Tests PERFORMANCE TESTS a e 4 15 FREQUENCY STABILITY TEST Cont d 10 Rotate the frequency counter SAMPLE RATE knob to HOLD press OFFSET then rotate the frequency counter SAMPLE RATE knob counter clockwise back to the normal position Reduce the output power to the level shown on the test card 10 dB and record the frequency change on the test card step 10 11 Ifthe Plug in is a multiband unit repeat step 10 for the other frequencies shown on the test card step 11 Frequency Change With 3 1 Load SWR FREQUENCY COUNTER SWEEP OSCILLATOR _ RF PLUG IN OUTPUT DIRECTIONAL COUPLER ATTENUATOR ADJUSTABLE 3dB SHORT OUTPUT Figure 4 6 Frequency Change with 3 1 Load SWR Test Setup ectequipment as shown in Figure 4 6 Press the8350A IN SET key the key 12 13 Enter the 8350A display frequ
190. must be performed to isolate the failure E014 E013 E012 E011 RAM These codes indicate a failure in RAM according to Table 8 21 Model 8350A Table 8 21 RAM Error Codes ee Code Line Hexidecimal Lines The RAM Test checks every bit of every RAM address location for both read and write capability The microprocessor steps through each location reads its contents writes the complement and reads it back These two words are then checked to assure that the complement was indeed written into RAM and read back Finally the onginal contents of the locations are restored U8 and U7 are tested simultaneously U8 contains 00 D3 information and 1 7 contains D4 07 information 015 and 014 are also tested simultaneously 015 contains D0 D3 information and Ul4 contains D4 D7 information The U8 U7 group is tested first If an error occurs the microprocessor determines if the most significant bits D4 D7 or least significant bits 00 03 caused the error and displays the appropriate error code When a RAM failure is detect ed the microprocessor jumps immediately to the beginning of the RAM test and Starts over Error codes E014 through E011 occur if a RAM cell is locked high or low or if the RAM s write capability 1s lost However this error also occurs if the RAM Control section or L WRITE line are malfunctioning It is especally important that RAMI L and the L WRITE be checked for activity sin
191. n offset and returning the displays to the previous mode the 0 LED will be on indicating that an offset is present however the display will remain unchanged Resolution Same as CF Accuracy Refer to RF plug in unit specifi cations Frequency Markers Five frequency markers are independently adjustable and fully calibrated over the entire sweep range Front panel key provides for the selection of either amplitude or intensity markers Resolution 0 4 of selected sweep width 250 points sweep Accuracy Refer to RF plug in unit specifications Marker Output Negative rectangular pulse avail able from the POS Z BLANK connector on the rear panel Refer to Tabie i 2 Model 8350A General Information Table 1 1 Model 8350A Specifications 2 of 2 Marker Sweep RF output is swept between Marker 1 and Marker2 frequency values The Marker and Marker 2 frequency values can be entered as permanent sweep values with the SHIFT key Pressing MKR SWEEP again returns the instru ment to the last START STOP values Marker CF Marker to Center Frequency function causes the CW or Center Frequency CF of the sweep output to equal the frequency of the active marker SWEEP AND TRIGGER MODES Internal Sweep recurs automatically Line Sweep triggered by ac power line frequency External Trigger Sweep is actuated by an external trigger signal applied to pin 9 of the rear panel Programming Connector on the rear pan
192. n a 1 2 5 sequency MANUAL SWEEP MAN FREQUENCY TIME display will read GHz MHz By using the FREQUENCY TIME control step keys or data entry keyboard itis possible to manually sweep the frequency range with the display indicating the present output frequency EXTERNAL SWEEP EXT The 8350A can be swept via an external voltage Apply 0 to 10 volts into sweep output input can use BNC connector on front or rear panel with 0V input corresponding to the lower frequency limit of the sweep range and 10V corresponding to the upper limit DC sweep input voltages will cause CW frequency outputs Markers and blanking outputs are disabled when in external sweep mode SWEEP TRIGGER Controls when the sweep will begin in the timed sweep mode The sweep light SWP is lit when the sweep is occurring INT Sweep triggered internally free running LINE Sweep triggered by power line frequency Figure 4 Frequency Time Controls 1 of 3 Model 8350A Local Operation EXT The sweep can be triggered externally by applying a positive going signal from 0 to2 volts minimum 4 20 volts maximum to Programming Connector pin 9 The trigger signal must be wider than 0 5 microsecond at less than a 1 MHz repetition rate SINGLE This key selects single sweep mode and aborts present sweep when first pressed Subsequent keying will trigger or abort single sweeps at current sweep time MARKERS Any or all of the five m
193. n limitations small changes to CW frequency may not be shown in the CW Frequency display The CW Vernier mode will allow small changes frequency to be displayed Page 1 7 1 8 Paragraph 3 36 Change the last sentence of paragraph 1 36 to read This allows the Model 8350A to work in conjunction with the HP Model 8756A Scalar Network Analyzer or HP Model 8755 Frequency Response Test Set to perform two simultaneous measurements utilizing different sweep widths and or power levels Add the following after paragraph 1 42 1 42A Displayed Frequency Multiplier 1 42B The frequency information of the 8350A front panel display may be modified by entering a numeric multiplication factor with the command n SHIFT M4 The displayed frequency information now reflects the actual RF frequencies produced by an external harmonic multiplier 1 42C Displayed Frequency Offset 1 42D The frequency information on the 8350A front panel may be modified by entering a numeric offset value with the command n SHIFT M5 The displayed frequency information may now reflect the actual RF frequencies produced by an external upconverter Model 8350A Page 1 10 Paragraph 1 69 e Add the following after paragraph 1 69 1 69 Model 8756 Scalar Network Analyzer 1 69B The Model 8350A Sweep Oscillator when equipped with Modification Kit 08350 60099 is compatible with the HP 8756A Scalar Network Analyzer for broadband swept scalar measur
194. nate n function alternates between current state and register selected on successive sweeps PANEL LAYOUT SAVEn RECALL n ALTn FUNCTIONS INDICATORS SAVE Enables current settings modes frequencies etc to be stored in a register Nine registers are available for storage 1 through 9 RECALL Enables a resetting of one of the nine stored register modes When enabled the registers may be incremented with the UP control or decremented with the down control Registers not previously stored will contain the instrument preset settings Alternate Alternates between current state and selected stored register on successive sweeps If used with appropriate HP 8755C current state response is on channel and selected state response is on channel 2 LIMITATIONS CONCERNS Unused registers have instrument preset values stored until new new values are stored The instrument preset function sets all registers to instrument preset settings except in Option 001 instruments which retain stored settings even with AC power off Remote Step Up Advance Programming Connector or Auto Step allows cycling of storage registers Figure 3 9 Storage Registers 1 of 2 Model 8350A M Model 8350 Operating Information LOCAL FUNCTION PROCEDURE Range and Keyboard Resolution Recall Settings RECALL X Integers 1 to 9 i Alternate Sweep X Integers 1 to 9 Settings 1 Step keys activated only after a number
195. ne voltage b Refer to Figure 2 1 At the instrument rear panel power line module select the line voltage 100 120 200 or 220 volts closest to the voltage you measured in step a Note the available line voltage must be within 4 596 or 10 of the line voltage selection as shown in Table 2 1 If it is not you must use an autotransformer between the power source and the Model 8350A Table 2 1 Line Voltage Fuse Selection Measured PC Selector Fuse ac Line Voltage Board Position HP Part Number 40A 90 to 105 volts 2110 0055 100 40A 2110 0055 108 to 126 volts 20A 2110 0002 198 to 231 volts 20A 2110 0002 216 to 252 volts 2 1 Installation Make sure the correct fuse is installed in the fuse holder The required fuse rating for each line voltage is indicated in Table 2 1 and below the power line module on the rear panel of the Model 8350 To prevent damage to the instrument make the correct line voltage and fuse selection before connecting line power to the instrument 2 10 Power Cable 2 11 In accordance with international safety standards this instrument is equipped with a three wire power cable When connected to an appropriate power line outlet this cable grounds the instrument cabinet Table 2 2 shows the styles of plugs available on power cables supplied with HP instruments The HP Part Numbers for the plugs are part numbers for the complet
196. nly be replaced by a qualified service technician 20 Model 8350A WARNING It is important that the following mainte nance procedures be executed to retain the safety features which have been designed into the instrument 3 103 Air Filter 3 104 The cooling fan located on the rear panel has a metal filter attached which will require periodic cleaning Due to the variety of environ mental conditions the interval between cleanings cannot be estimated Error signal E016 indicates reduced air flow through an increase in temper ature in the cooling system When this error is noted on display a clogged filter may be the reason To clean the filter refer to Section 8 of the manual 3 105 3 106 If plug ins are changed frequently and or the interconnectors are dirty the 8350A plug in interconnect connector may require cleaning to avoid voltage losses tune voltage Plug in Interconnect 3 107 Service Tag Information 3 108 If the Sweep Oscillator requires service and the operators maintenance is not sufficient the instrument may be sent as per Section 2 to your local HP service organization Before sending the instrument back fill out and attach one of the blue service tags If a sweep oscillator error code is noticed when a failure occurs note that error code in the failure symptoms special control SEHE section of the tag Model 8350A Operating Information FREQUENCY Sweep Mode DESCRIPTIO
197. nt HP IB address setting 2 16 Option 001 Model 8350A instruments contain a battery supported memory and a special A3 Microprocessor board The battery option allows the instrument memory to retain the assigned HP IB address when the instrument is turned off regardless of the 851 address switch setting Upon initial power on the HP IB address will need to be set to the desired code through the front panel SHIFT LOCAL function The address will be retained as long as the battery is charged to a sufficient level Refer to the Battery Operation Option 001 paragraph in this section of the manual further information on Option 001 instruments 2 17 HP IB address labels are available by toward rear of 8350A Installation ordering HP Part Number 7120 6853 each See Figure 2 4 These labels allow easy reference to the HP IB address of each system component Part No 7120 6853 j Figure 2 4 HP IB Address Label 2 18 11869A Switch Settings for HP 86200 Series RF Plug ins 2 19 The identification switch on the Model 11869 RF Plug in Adapter must be preset when using the adapter with HP 86200 Series RF Plug ins in the Model 8350A The setting of the identification switch is interrogated at power on when the 8350A INSTR PRESET button is pressed or when an HP IB Instrument Preset LOGIC 1 OPEN LOGIC 0 GROUND Figure 2 3 851 Address Switch 2 5 Installation Model 8350A
198. nterrogated Parameter are FA CW CF DF FB VR SHVR MI 2 3 4 5 SHMI SF SM ST PL PS SL and SP The Request Mask byte value is reset only when another value is programmed It is unaffected by Instrument Preset The plug in FM Sensitivity range is reset after an Instrument Preset to the value selected by the internal switch The Output Learn String Output Micro Learn String Output Mode String and Output Status functions send a Data message consisting of a string of 8 bit binary bytes terminated using the bus END command EOI and ATN true with the last byte The Output Interrogated Parameter and Output Active functions send a Data message consisting of a 14 character ASCII string representing the numeric value in exponential form terminated with a Carriage Return Line Feed CR LF Binary Syntax b b EOI Numeric Syntax d dddddE dd CR LF Where the character b indicates an 8 bit binary byte and d indicates a decimal digit 0 through 9 Note thatthe binary output format could have bytes that may be misinterpreted as Carriage Returns and or Line Feeds so the user should defeat the ASCII CR LF as valid character string terminators and rely on the byte count REMOTE FUNCTION PROCEDURE 8350A Output Response Input Display DISPLAY Update UPDATE ON On Off DISPLAY UPDATE OFF e 20 MHz V Sensitivity 6 MHz V Figure 3 17 Only Functions 4 of 7 48
199. o the offset press SHIFT VERNIER 0 MHz OVERRANGE The 8350A will permit frequency sweeps beyond the specified range of the plug in by 2 0 of the plug in bandwidth However plug in performance in the overrange condition is unspecified As a warning of the frequency overrange condition the GHz or MHz annunicator will flicker in the appropriate function display Figure 3 Frequency Controls 2 of 2 Local Operation 8350 1 i FREQUENCY TIME This display will read either GHz MHz or sec depending upon the presently active function and range This section controls five mainframe markers manual sweep and the sweep time The five independent frequency markers be displayed simultaneously as intensified dots on a CRT using the Z axis or amplitude dips on the RF output SWEEP Controls the rate at which the RF output is swept TIME When the TIME key is pressed the output is swept at the user specified or default rate Iftime key is litbut display reads GHz MHz oris blank press TIME key again and display will read seconds The mainframe can allow sweep times from 100 seconds to 0 01 second although the minimum sweep time is dependent on the plug in being used and bandwidth being swept When display reads seconds sweep time can be adjusted with the control knob or data entry keyboard The step keys can be used to adjust the sweep time i
200. o adjust power level such that the minimum power point across the sweep lies exactly on the center line See example on Figure 4 4 The minimum power on the full sweep is then at the specified maximum power Check and record the peak power across the whole band on the test record card step 15 POWER VARIATION _ MAXIMUM LEVELED POWER REFERENCE Figure 4 4 Typical Maximum Leveled Power and Variation 16 Press BYPASS on the storage normalizer Engage the 10 dB DIV button on the amplitude analyzer Power Sweep Check 17 Press START 8350A Press POWER LEVEL on plug in and adjust power control to the value shown on the performance test card step 17 Engage POWER and adjust POWER control clockwise until the UNLEVELED light turns on Turn POWER control counterclockwise until the unleveled light remains off Check the POWER SWEEP display and amplitude analyzer display to verify the amplitude change from beginning to end of sweep is at least the level specified on the test card step 17 4 15 FREQUENCY STABILITY TEST SPECIFICATION See Performance Test Record Card in section IV of the plug in manual used for Frequency Stability specifications DESCRIPTION A frequency counter is used to check frequency change due to line voltage changes time 10 minutes output power level changes and load impedence changes H
201. of the test routine for the failed Model 8350A test The number of L EAC clock pulses generated 15 equal to 15 minus the test number For example if the Front Panel Bus test Test number 6 fails the number of L EAC transitions generated is nine 15 6 As a result the Self Counter outputs represent the binary complement of nine and the LEDs indicate DS1 MSB OFF 052 ON DS3 ON DS4LSB OFF This indication is interpreted as a six E006 If all tests pass the Self Test Routine generates fifteen transitions of L EAC resulting in all of the indicator LEDs being turned off The Self Test Routine may also be initiated by programming the Instrument Preset function through HP IB Operation of the Self Test circuit 15 the same with the following exceptions The microprocessor is programmed to reset instead of using the PWON control line and Self Test Counter U2A is reset only by the L EAR control line Supply Filtering The Supply Filtering circuit filters the supply voltages used by the A3 Microprocessor and provides a protected 5V supply Vccp for RAM The circuit operates in one of two states When ac line power is applied to the 8350B LINE switch in ON position transistors Q5 through Q7 are all biased on Thus Vccp approximately equals 5VF and the battery BT which connects to the circuit at 1 21 5 BAT charges through R18 When the 8350B ON OFF switch is in the OFF position transi
202. omentarily turn on then either an error code should be displayed or the four LEDs should turn off indicating the self test is complete In addition to indicating which Self Test failed the error code provides additional information about the tests that passed Any section of circuitry Model 8350A exercised by a test before the indicated failure code is very probably functioning properly and can be eliminated from further troubleshooting procedures Table 8 2 in the General Troubleshooting section lists error codes A list of the error codes for the A3 Microprocessor follows NOTE In the event of a Front Panel failure the four Front Panel SWEEP TRIGGER annunciators used to indicate errors may display an incorrect error code or none at all Check the four LEDs on the A3 Microprocessor to be certain of the error code Press and hold down the Instrument Preset button to light ALL the LEDs and insure that none are burned out Press Instrument Preset several times to make sure the same error code appears each time No LEDs turn on Self Test not initiated LEDs do not turn on when INSTR PRESET key is pressed Check that the Power Supplies are functioning Check that TP17 is at 5 Vdc and free of excessive digital noise Power for the RAMs is supplied by a special circuit Q5 Q6 and Q7 This circuit recharges the battery and prevents it from discharging through the power supply when the power is off Check pin 18 of the RAMs U14 U1
203. on on RF output 1 Press the key and then rotate the START control clockwise to increase the start frequency until the display above the START key reads 4 200 GHz Rotate the STOP control counterclockwise to decrease the STOP frequency to 6 500 GHz Press the key then turn the FREQUENCY TIME control clockwise to increase th ep time to 0 2 second displayed on the FREQUENCY TIME display key to activate the internal 27 8 KHz square wave modulation lamp in the center of the key will be on Press the EL key then turn the plug in POWER control until the INSTRUMENT PRESET This condition occurs when the power is turned on or when the INSTR PRESET key is pressed INSTR PRESET causes an internal selftest to occur after which the instrument will be setto the preset condition If certain internal errors or failures are detected during the self test or during normal operation of the 8350A they are indicated via error codes in the form Ennn where n 0 9 read from the left FREQUENCY display For a complete description of the error code listing see the Operating and Service Manual Section 8 The error codes are E001 Plug in interface failure Check plug in E002 Sweep voltage DAC Marker voltage DAC failure E003 Tuning voltage DAC Marker voltage DAC failure Figure 1 Instrument Preset Key 1 of 2 Model 8350A Local Operation E004 Power supply failure E005 Instrument inte
204. on contains a index of keys and functions which refer to the figured functional blocks at the end of this subsection Included in this section are descriptions of all front panel controls connectors and indicators operator s checks operating instructions and operator s maintenance 3 3 SAFETY 3 4 Before appplying power refer to SAFETY CONSIDERATIONS in Section I ofthis manual 3 5 Theinformation cautions and warnings in this manual must be followed to ensure safe operation and to keep the insturment safe Before the instrument is switched on all protective earth terminals extension cords auto transformers and devices connected to it should be connected to a protective earth grounded socket Any interruption of the protective earth grounding will cause a potential shock hazard that could result in personal injury Only fuses with the required rated current and specified type should be used Do not use repaired fuses or short circuited fuseholder To do so could cause a shock or fire hazard CAUTION Before the instrument is switched on it must be set to the voltage of the power source or damage to the instrument may result 3 6 OPERATING CHARACTERISTICS 3 7 Table 3 1 briefly summarizes the major operating characteristics of the Sweep Oscillator The table is not intended to be an in depth listing of all operations and ranges For more infor mation on Sweep Oscillator capabilities refer to Specifications
205. on of data transfer to from microprocessor Data Lines Bi directional logic lines used for communicating between the microprocessor and memory or input output devices The Microprocessor uses the Front Panel Bus to read information from the front panel keyboard and Rotary Pulse Generators RPGs and write informa tion to the front panel displays and annunciators The Instrument Bus is used for communicating with the A4 Scaling and Marker A5 Sweep Generator A8 HP IB Interface and the RF Plug in The Clock Generation circuit provides the two phase clock for the micro processor and other timing signals for the remaining circuits on the A3 assembly The microprocessor executes a 40K byte program stored in ROM Read Only Memory Three types of instructions are implemented Read Data Transfer data from ROM RAM or input device to internal registers in microprocessor Write Data Transfer data from internal registers to a specific location in RAM or an output device Process Data Perform arithmetic or logic operations on data loaded in internal registers The microprocessor address lines determine the source destination of micro processor data The Address Decoder circuit decodes the high level bits of the address lines into control lines used to enable data transfers between the microprocessor and specific blocks of memory or other sections of the instrument The Front Panel Bus Buffer circuit provi
206. one Option 907 Front Handles Kit and one Option 908 Rack Mount Kit see descriptions in preceding paragraphs Refer to Section II of this Operating and Service Manual for a detailed description of this kit and instructions for installation 1 56 Option 910 Extra Operating and Service Manual 1 57 The standard instrument is supplied with one Operating and Service Manual Each Option 910 provides one additional Operating and Service Manual To obtain additional Operating and Service Manuals after initial shipment order by manual part number listed on the title page and rear cover of this manual 1 58 ACCESSORIES SUPPLIED 1 59 Figure 1 1 shows the Model 8350A and power cable The power cable supplied depends upon the country of destination Refer to Section II of this manual for HP Part Number infor mation 1 60 EQUIPMENT REQUIRED BUT NOT SUPPLIED 1 61 To have a complete operating sweep oscillator the Model 8350A Sweep Oscillator must have an RF plug in unit installed The HP 83500 Series RF Plug ins have been specifically designed for use with the Model 8350A They provide calibrated output power levels calibrated power sweeps internal leveling and slope control and full HP IB programmability Economical use of the HP 86200 Series RF Plug ins may be untilized with the Model 8350A with the addition of the HP Model 11869A RF Plug in Adapter The Model 11869A mounts at the rear of the Model General Information
207. ons and the instrument status wrt 719 OUTPUT 719 red 719 A trg 719 TRIGGER 719 t T7 SDC Device Clear clr 719 CLEAR 719 System Remote REMOTE 7 Device Remote rem 719 REMOTE 719 System Local LOCAL 7 Device Local lcl 719 LOCAL 719 LOCAL Ilo 7 LOCKOUT 7 lcl 7 LOCAL 7 ENTER 719 A Responds by triggering a sweep if and only if in the single sweep trigger mode GET DTI Device Trigger Clears the instrument status byte and the extended status byte Local Yi Clear Lockout Set Local Removes the 8350A from local front panel control to remote HP IB control All functions remain the same as in local and the keyboard is non responsive except the LOCAL key EN 2 Removes the 8350A from re mote HP IB control to local front panel control func tions remain the same as in the remote state 2 z Functions the same as the remote message except that the entire front panel is disabled including the LOCAL key Removes the 8350A from local lockout and remote HP IB control to local front panel control All functions remain the same as in the remote state afele The 8350A can set the HP IB SRQ Service Request line if one ofthe following instrument conditions exists and has been 45 719 STATUS Require enabled by the Reques
208. ont Panel Bus self test For more details of this test refer to the troubleshooting section for the 2 Front Panel Interface Self Test Error Code Indicator C The Self Test Error Code Indicator circuit provides a pass fail indication for the tests in the Self Test Routine STR The STR is initiated by any of the following actions Cycling the ac line power Pressing the front panel INSTR PRESET key Programming the Instrument Preset function via HP IB Either of the first two actions cause the PWON Power On control line input to go low which resets microprocessor US through U4A and U4B This results in the microprocessor jumping to and executing the Self Test Routine The L RES output of U4A is also buffered through NAND gate U3A and resets the Self Test counter U2A With all of the U2A outputs low LEDs 051 through DS4 are turned on The indicator LEDs are binary weighted 8 4 2 1 with 051 being the Most Significant Bit MSB An LED that is turned on indicates a logical one 1 At the beginning of the Self Test Routine the microprocessor ensures that the Self Test Counter is reset by setting L EAR Low Error Accumulator Reset active low The Self Test Counter remains reset until either a Self Test fails or all tests pass If a test fails the microprocessor executes a set of instructions to increment the Self Test Counter with L EAC Low Error Accumulator Clock The microprocessor then continues execution
209. onto the Instrument Bus When the microprocessor Free Run test 15 run 12 can be grounded to disable the Address Decoder circuit see A3 Troubleshooting at the end of this circuit description The L 10 address line at TP11 is also useful for trouble shooting and can be used to provide a pulsed source for checking shorted data or control lines ROMS P ROMs U9 U10 U11 and U35 store the 40K by 8 bits of program data that is executed by the microprocessor to control the rest of the 8350B and the RF Plug in installed ROMs U10 011 and U35 store 8K bytes of program and has a unique ROM enable line that enables each ROM over an 8K block address space ROM U 9 stores 16 bytes of program information L 2 Enables ROM U9 for address locations C000 through FFFF L Enables ROM U11 for address locations A000 through BFFF 4 Enables ROM 035 for address locations 8000 through 9FFF L ROMS Enables ROM U10 for address locations 6000 through 7FFF Model 8350A RAMs H Data that is generated and or processed during program execution is stored in RAM Random Access Memory U14 U15 U7 and U8 Examples of the types of data stored in RAM are the present state of the front panel the data associated with the nine SAVEn RECALLn front panel settings the data used to control the rest of the 8350B the HP IB address the RF Plug in code etc The total RAM storage capacity is 2K by 8 bits Since eac
210. or whenever the front panel INSTR PRESET key is pressed An active low L RES Low Reset input to microprocessor US resets the microprocessor which initializes program execution at address FFFE The address of the first program instruction is stored at addresses FFFE and FFFF The PWON Power On input from the A6 Rectifier is buffered by Schmitt trigger logic gates U4B and to provide fast rise and fall time of the L RES micro processor input RC combination R14 C30 filters transient noise spikes on the PWON line The Data Bus Enable DBE input must be a logic high to enable the microprocessor to read or write data The microprocessor has two interrupt inputs LNMI Low Non Maskable Interrupt and LIRQ Low Interrupt Request The difference between the two signals is that LIRQ is ignored masked by the microprocessor if an internal flag is cleared but an active low LNMI always requires a response When either interrupt input is active low the microprocessor completes the instruction it is executing then immediately jumps to the Interrupt Service Routine stored in ROM A Free Run Test of the microprocessor can be performed by setting all eight sections of Sl open and grounding TP9 LDSA Low Digital Signature Analysis This Free Run Test isolates the microprocessor from the data bus and forces a CLR B Clear B Accumulator instruction into the microprocessor The result is that the microprocessor increments through its entire add
211. otely The ADRS D LED indicates when data is being transmitted or received over the HP IB Model 8350A General Information Table 1 2 Model 8350 Supplemental Characteristics 2 of 2 REMOTE PROGRAMMING HP IB Instrument Control All front panel controls except the line power switch may be controlled or programmed remotely The 8350A is fully com patible with the HP IB The 8350A has both input and output capability providing complete con trol of the instrument state The HP IB address can be displayed on the front panel and is selectable by the user from 0 to 30 Refer to Table 2 3 for a listing of HP IB address codes HP IB Functions Input Mode Functions All front panel controls except the ac power line switch are pro grammable Functions that require numerical values typically have greater entry resolution than is displayed Several special HP IB functions are provided that are not available from the front panel Frequency Resolution Same as CF AF plus vernier Power Resolution Refer to RF plug in unit specifications Output Mode Functions 8350A can output to a controller an instrument state message that completely describes the present instrument status sweep mode trigger mode etc and can supply the present numerical value of any function sweep time marker frequencies power levels start stop frequencies etc GENERAL Nonvolatile Memory Option 001 Continuous memory that reta
212. plement contains informa tion for correcting errors in the manual To keep this manual as current as possible Hewlett Packard recommends that you periodically request the latest Manual Changes supplement The supplement for this manual is keyed to the manual s print date and part number both of which appear on the title page Complimentary copies of the Manual Changes supplement are available on request from Hewlett Packard 1 18 For information concerning a serial num ber prefix that is not listed on the title page or in the Manual Changes Supplement contact your nearest Hewlett Packard Sales Service Office 1 19 DESCRIPTION 1 20 The Hewlett Packard Model 8350A Sweep Oscillator together with an RF plug in unit forms a complete solid state swept signal source The Model 8350A can be used with network analyzer systems such as the HP Model 8410B Network Analyzer the HP Model 8755 Frequency Response Test Set and the HP Microwave Link Analyzers to provide a complete measurement system 1 21 The front panel of the Model 8350A has been conveniently laid out to optimize the use of instrument operation function blocks Frequency modes sweep modes marker operation storage register control and data entry controls are individually grouped for ease of operation and full control versatility on the Model 8350A Sweep Oscillator Model 8350A 1 22 Upon initial turn on or after the INSTRument PRESET pushbutton is selected
213. pler and two detectors For more information and additional features of the 8756A with the 8350B refer to the Operating Section of the 8756A Operating and Service Manual Model 8350A Example 1 Connect the equipment as shown in the diagram below Initially the 8350B should be set by pressing PRESET on the 8756A The sweep time will be set to 150 ms the 8350 internal square wave modulation and the 3508 INSTR PRESET will be activated 8756A 83508 SWEEP 83500 8756 SCALAR OSCILLATOR SERIES PLUG IN NETWORK ANALYZER INTERFACE 5 0000000 11664 116920 COAXIAL DUAL DIRECTIONAL COUPLER Notes on connections Either the front or rear panel SWEEP OUT IN may be used When in ALTn mode hoth channels 1 and 2 on 8756A must be on and receiving inputs Turn off channel on the 8756A by pressing SHIFT MEAS RATIO Set the 5350 controls as desired On channel 2 set the function dB DIV and Offset desired for view ing the current sweep setting Set the 8350B controls as desired then store the current 8350B sweep setting in available memory location Then turn off channel 2 of the 8756A by pressing the SHIFT MEAS RATIO pushbuttons On Channel of the 8756A set the function dB DIV and Offset as desired Set 8350B controls as desired Turn on channel 2 Press ALTn n and the 8350B will alternate between the two set tings on successive sweeps Channel 1 now displa
214. proximately 0 15 ms Model 8350A Adjustments ADJUSTMENTS 5 18 27 8 1 kHz OSCILLATOR ADJUSTMENT REFERENCE 5 Sweep Generator Assembly DESCRIPTION The internal AM 27 8 1 kHz oscillator frequency is adjusted for optimum center frequency at either 27 8 kHz or 1 kHz A jumper on the A5 Sweep Generator Assembly selects the oscillator frequency which will then be used to modulate the RF Output frequency when SQUARE WAVE MODulation is selected by the front panel Li key SWEEP OSCILLATOR UNIVERSAL COUNTER TO J5 POS 2 BLANK Figure 5 14 27 8 1 kHz Oscillator Adjustment Setup EQUIPMENT sweep HP 8350A Universal HP 5328A 2 dele eU Ede DR wi ed HP 10008B PROCEDURE 1 Remove the RF plug in from the sweep oscillator mainframe 2 Position the sweep oscillator upright as shown in Figure 5 14 and remove the top cover and the A4 AS5 shield cover 3 Set the 5328A controls as follows FUNCTION 229 wee er s aae e dto FREQ A SAMPLE RATE aem ip n n tem SOR CCW OSC reat panels chee a fetes INT ARM ON OFF rear OFF STORAGE ON OBE e ER KR Rp d eme tbe ON POWER ON Input Amplifier Control Switch SEP Channel A SLOPE 5 4 CERE
215. r the Model 8350A Sweep Oscil 2 10 Model 8350A lator must have an RF plug in unit installed To install an HP 86200 Series RF plug in coupled to a Model 11869A RF Plug in Adapter in the Model 8350 refer to Section II Installation in the Model 11869A Operating and Service Manual To install an HP 83500 Series RF plug in unit into the Model 8350A mainframe a Set the Model 8350A mainframe LINE switch to OFF b Remove all connectors and accessories from the front and rear panel connectors to prevent them from being damaged c Position the RF plug in unit latching handle in the fully raised position The latching handle should spring easily into the raised position and be held by spring tension d Insure that the mainframe RF plug in channel is clear align the RF unit in the channel and slide it carefully into place towards the rear of the channel It should slide easily without binding e The drawer latch handle slot will engage with the locking pin just before the RF plug in is fully seated in position f Press the latch handle downward while still pushing in on the RF plug in until the drawer latch is fully closed and the front panel of the RF plug in is aligned with the mainframe front panel 2 40 Bench Operation 2 41 Theinstrument cabinet has plastic feet and a foldaway tilt stand for convenience in bench operation The tilt stand inclines the instrument for ease of operating the front panel controls
216. r Control to 2 GHz Press 2 and set frequency via DATA ENTRY keyboard or Control to 2 4 GHz Press SHIFT A Note Frequency Time display reads difference between Marker 4 and Marker 2 400 MHz Figure 4 Frequency Time Controls 3 of 3 Model 8350A Local Operation OFFSET 2 STRUMENT STAT un AE SAVEn RECALLn ALTn SAVEn RECALLn 8350A is equipped with memory registers which allow up to nine complete front panel settings frequency range markers power level etc to be stored and later recalled Instrument settings are stored in memory locations 1 through 9 by pressing SAVEn and 1 or9 To recall a stored instrument setting press RECALLn and 1 or9 The STEP keys may be used to step through the stored registers The instrument settings stored in memory may be recalled remotely in sequence by using the Step Up Advance on pin 22 of the Programming Connector on the rear panel of the 8350A A contact closure to ground or logic 0 is used to implement this function ALTn ALTn causes the 8350A to alternate between the current instrument state and the setting stored in memory location n where n 1 9 on successive sweeps When the 8350A is in this mode the lamp will be on and the SAVEn and RECALLn keys disabled To exit from the ALTn mode press the key again the lamp wil turn off and the SAVEn RECALLn keys
217. r panel PROGRAMMING CON NECTOR Additionally the sweep oscillator RF plugin 1V GHz output connects to the Model 8410B rear panel FREQ REF INPUT to insure that the Model 8410B phase locks with the sweep oscillator properly when sweeping octave or multi octave bands The Model 8410B Source Control Cable connector pins and signals are illustrated in Table 1 3 of this manual 2 33 Operating Environment 2 34 Temperature The instrument may be operated in temperatures from 0 C to 55 2 35 Humidity The instrument may be operated in environments with humidity from 596 to 80 relative at 25 C to 40 However the instrument should also be protected from temper ature extremes which cause condensation within the instrument 2 36 Altitude The instrument may be operated at altitudes up to 4572 meters approxi mately 15 000 feet 2 37 Cooling Clearances for ventilation should be atleast 10 cm 4 inches at the rearofthe cabinet and 7 6 cm 3 inches at the sides The clearances provided by the plastic feet in bench stacking and the filler strips in rack mounting are adequate for the top and bottom cabinet surfaces diagram illustrating the path for cooling airflow generated by the rear panel fan is given in Figure 2 8 Insure that the air intake and exhaust venting holes are notobstructed within the limits shown in Figure 2 8 2 38 RF Plug in Installation 2 39 To operate as a completely functional sweep oscillato
218. re both developed from the L RAM output of U23 pin 15 and further decoding of the A10 address line 10 is used to generate L 2 Both signals are gated with IOS Input Output Strobe and PWON Power On control lines through NAND gates UI9A and U19B Because both RAM enable lines are gated with IOS they are only allowed to be active during a data transfer Gating with the PWON control line prevents random data from being written into RAM when the line power is turned off e is developed through decoding of L 2 024 pin 9 and L ROM 1 U24 pin 7 control lines with NAND gate U3C and inverter U18B If either of these lines is active low L 1 2 goes active low When AVS Address Valid Strobe and VMA Valid Memory Address are active high U24 is enabled to decode address lines A13 through 15 and enable address space in 8K blocks U23 is is enabled when AVS and VMA are active high and both A14 and AIS are low first 16K of address space U23 decodes address lines 11 through A13 to enable address space in 2K blocks Two other control lines generated by the Address decoder are L IBE Low Instrument Buffer Enable and II OS Instrument Input Output Strobe L IBE is active low whenever the microprocessor communicates on the Instrument Bus Addresses 2000H through 5FFFH and enables the address and data buffers in the Instrument Bus Buffer The II OS control line is a gated I OS signal that 1s used to strobe data
219. requency Accuracy 6 Check frequency accuracy by setting the CW frequency on the 8350A and recording the frequency observed on the frequency counter at the three points on each band as shown on the test card step 6 Follow the sequence of frequencies on the test card to avoid band crossover problems Swept Frequency Accuracy lt Press 8350A 7 Press frequency counter RESET SWP M Light on Blue Key 11 INSTR PRESET and set sweep time to 105 msec 8 Press8350A START SHIFT then M2 Check and record the frequency counter reading on the test card step 8 9 Press 8350A STOP SHIFT then M2 Check and record the frequency counter reading on the test card step 9 10 For multiband plug ins repeat steps 8 and 9 using the start and stop frequencies on test card step 10 Performance Tests PERFORMANCE TESTS 4 13 FREQUENCY RANGE AND ACCURACY TEST Cont d Frequency Marker Accuracy 11 Press 8350A and set sweep time to 105 msec Model 8350A 12 Setthe8350A frequency markers to the frequencies listed and record the frequency counter readings on the test card step 12 13 Formultiband plug ins set the start and stop frequencies on the test card step 13 and repeat the previous step with the markers set as shown on the test card step 13 Alternate Swept Frequency and Marker Accuracy Test OSCILLOSCOPE SWEEP OSCILLATOR RF PLUG IN SWEEP f OUTPUT OUTPUT
220. ress field generating signatures at various nodes of the A3 Assembly Refer to Microprocessor Troubleshooting for more detailed information on the Free Run Test Model 8350A 97 payee Address Decoder The Address Decoder decodes the high level address bits 10 15 into control lines that enable data transfers between the microprocessor and specific blocks of memory or other sections of the instrument Each section that communicates with the microprocessor is given a specific block of address space Table 8 19 lists the address space allocation for the system Table 8 19 Microprocessor Address Space Allocation Amount Address Space AS Sweep Gen 2000 27FF 2K A8 HP IB LI OEI Low Enable 1 2800 2FFF RF Plug in L I OE2 Low I O Enable 2 3000 3 7FF A4 Scaling and Marker LI OE3 Low I O Enable 3 Contro Line Low RAM Enabie 2 3800 3FFF Self Test Counter L EAR Low Error Annunc Reset ROM Enable C000 FFFF L ROMI 2 Low ROM 1 2 each of these cases the L IBE Low Instrument Buffer Enable control line is also true enabling the address and data buffers of the instrument bus buffer to be active Model 8350A Most of the control line outputs listed in Table 8 19 are generated directly by 3 to 8 decoders U23 and U24 However additional decoding is provided to generate the following control lines RAMI and L a
221. rface bus failure 006 Front panel bus failure E007 ROM failure E008 E009 E010 E011 RAM failure E012 E013 E014 E015 Microprocessor failure E016 Insufficient cooling Check fan If the self test completes without errors the ent presets to SWEEP MODE START STOP over full frequency range of plug in SWEEP TIME fastest allowable for plug in MARKERS off MODULATION off SWEEP TRIGGER SWEEP INT TIME VERNIER OFFSET 0 MHz DISPLAY BLANKING on SAVE RECALL Initial power on sets all memory locations to INSTR PRESET state ifc using 8350A Option 001 Non Volatile Memory or if instrument is already the memory values remain unchanged when INSTR PRESET is pressed ALL OTHER FUNCTIONS off When using 83500 series Plug ins POWER LEVEL maximum specified leveled value RF and CW FILTER on ALC MODE INT CRYSTAL MARKERS off 83522A 83525A only ALL OTHER FUNCTIONS off Figure 1 Instrument Preset Key 2 of 2 Local Operation Model 8350A OOO SWEEP TRIGGER SWEEP RF LIT 25 56558 1658 DATA ENTRY This section contains the numeric keyboard terminators i e GHz seconds dBm step size up down backspace and shift keys In addition to using the appropriate control a function value can be set to an exact value or incremented by a specific amount via the keyboard Number unit keys These keys are used to enter values of frequency time
222. rial number located on rear panel serial plate Mark the container FRAGILE to assure careful handling In any corres pondence refer to the instrument by model number and full serial number 2 56 Other Packaging The following general instructions should be used for repack aging with commercially available packaging materials a Wrap the instrument in heavy paper or plastic If shipping to a Hewlett Packard Office or Service Center attach a tag indi cating the type of service required return address model number and full serial number b Use a strong shipping container Use enough shock absorbing material around all sides of the instrument to provide a firm cushion and to prevent movement inside the container Protect the control panel with cardboard d Seal the shipping container securely e Mark the shipping container FRAGILE to assure careful handling f any correspondence refer to the instru ment by model number and full serial number ATIO FO Wg Jy IQ 8350A a er o e e ra 1 cc 8350A SWEEP OSCILLATOR Copyright HEWLETT PACKARD COMPANY 1980 1400 FOUNTAIN GROVE PARKWAY SANTA ROSA CALIFORNIA 95404 MANUAL PART NO 08350 90001 Microfiche Part No 08350 90002 Printed AUGUST 1980 U HEWLETT PACKARD Model 8350A Operating Information SECTION 111 OPERATING INFORMATION 3 1 INTRODUCTION 3 2 Thissubsecti
223. ristics 1 38 Model 8350 is capable of internally square wave modulating the RF Output at a 27 8 kHz or kHz selected by an internal jumper modulation frequency as controlled by the front panel Square Wave Modulation pushbutton The RF Output may also be Amplitude or Frequency modulated by an external source via the Model 8350A Sweep Oscillator rear panel inputs 1 39 Remote Programming 1 1 40 All front panel controls except the line power switch may be controlled or programmed remotely via the rear panel HP IB interface connector The Model 8350A can also output to a controller an instrument state message that com pletely describes the current instrument status sweep mode trigger mode etc and can supply the present numerical value of any function sweep time marker frequencies power levels START STOP frequencies etc 1 41 Other Features 1 42 The Model 8350A also provides RF output blanking during sweep retrace and rear panel positive and negative polarity display blanking outputs for retrace and bandswitching points of sweep A rear panel PEN LIFT output generates a pulse which is coincident in time with the end points of the sweep A COUNTER TRIGGER output and STOP SWEEP inputare also available on the rear panel to interface with the HP Model 5343A Microwave Frequency Counter A 25 pin rear panel Programming Connector provides additional control of and information on the Model 8350A instrument
224. ront panel setting while channel 2 displays the response to the setting stored in memory location n The front panel controls of the 8350A are enabled and the current sweep setting may be altered if necessary Figure 11 Typical Test Setup Using 87555 18 Model 8350A Local Operation Figure 12 8410B Network Analyzer 8410B NETWORK ANALYZER The 8350A is compatible with the 8410B Network Analyzer systems and accessories The Source Control Cable HP P N 08410 60146 synchronizes the two instruments to provide continuous multi octave coaxial magnitude and phase measurement capability from 110 MHz to 18 GHz with 65 dB dynamic range The frequency markers can be displayed in polar format as intensity dots Z axis Frequency markers derived from crystal oscillators allow frequency measure ments to be made with an accuracy of five parts per million Waveguide measurements between 18 and 265 GHz can be made with the K8747A Reflection Transmission Test Unit which is designed for use with the 8410B This test system utilizes two 8350A Sweep Oscillators and 83570A 18 to 26 5 GHz RF Plug ins One sweeper is used as a local oscillator while the second is used to sweep the desired frequency range See Figure 13 for an example measurement set up using the 8410B with a single 8350A and 83500 series Plug in The 8410B FREQ RANGE should be set to AUTO In addition the sweep time on the 8350A should be slow enough and or sweep range narro
225. s Hence any combination of intensity or amplitude markers will work Intensity markers obtainable using the positive polarity Z axis output only 3 Maximum drive level of External Marker Input is 10 dBm 4 Plug in markers can be intensity and amplitude variety simultaneously LOCAL FUNCTION PROCEDURE Range and On Off Knob Step Keyboard Resolution w tx _ x wwe Px mn fx P Amplitude Markers Intensity Markers REMOTE FUNCTION PROCEDURE bee TER External Input Amplitude MKR On CAI Amplitude MKR Off Intensity MKR On Intensity MKR Off CIO 1 Mode disables the previous mode INTENS MKR Crystal Marker Frequency Crystal Marker Figure 3 16 Crystal Marker Frequency 83500 series plug ins 2 of 2 44 Model 8350A Operating Information HP IB ONLY FUNCTIONS DESCRIPTION This section describes functions which are only accessible via the HP IB These functions allow the HP IB user to learn about the present instrument state setup the instrument state and enable some special functions to improve HP IB operation DESIGNED B SYSTEMS FUNCTIONS INPUT OUTPUT LEARN STRING A string of 90 bytes of binary data that completely describes the present instrument state does not include the storage registers of the 8350A and 83500 Series Pl
226. se for a counter reading of 500 100 us This sets the width of the 8 volt marker pulse as shown in Figure 5 20 Refer to Figure 5 19 for adjustment location FORWARD RETRACE ae POSITIVE BLANKING NEGATIVE MARKER Figure 5 20 Marker DAC Adjustment Waveform 5 30 HEWLETT PACKARD 0 HP Part No 08350 90001 MANUAL SUPPLEMENT 8350A SWEEP OSCILLATOR Modification Kit 08350 60099 for 8350B firmware update USE THIS SUPPLEMENT WIT MANUAL PART NUMBER 08350 90001 HEWLETT c PRINTED JANUARY 1981 PACKARD 34 pages plus 1 foldout Model 8350 GENERAL INFORMATION INTRODUCTION This manual supplement describes the difference between a factory equipped 8350A Sweep Oscillator and an 8350A Sweep Oscillator equipped with Modification Kit 08350 60099 In addition this supplement describes changes to the 8350A Operating and Service Manual 08350 90001 necessary to document the addition of the 08350 60099 Modification DESCRIPTION The 08350 60099 Modification Kit allows the HP 8350A Sweep Oscillator to be fully compatible with the HP 8756A Scalar Network Analyzer Other features are listed below Non volatile memory Increased resolution in CW mode CW resolution is 0 00038 of band This resolution isavailable via Control Knob RPG Data Entry Keyboard HP IB Interface or direct control of the CW DAC Digital to Analog Converter with Hex Entry commands Coarse or fin
227. seconds Figure 3 10 Sweep Sweep Trigger 2 of 2 33 Operating Information Model 8350A DATA ENTRY Step Keys Keyboard DESCRIPTION This function block contains the step key function numeric entry keyboard and terminators which allow modification of many ofthe values of functions This function block has a back key which works like a erase or rubout of the last entry Also in this function block is a shift key blue which enables shift key functions PANEL LAYOUT DATA ENTRY FUNCTIONS INDICATORS STEP SIZE This function allows the setting of the frequency or power level step size step up This function increments the presently active parameter value by the appro priate step size step down This function decrements the presently active parameter value by the appropriate step size 0 9 Numeric digits sign and decimal point useable to input data for active function BACK SPACE This function performs a character back space or rubout to erase the last digit entered on the present numeric entry Function enabled only when entering a number and units terminator have not been entered GHz s Units terminator for Gigahertz frequency data or seconds time data MHz ms Units terminator for Megahertz frequency data or millisecond time data dBm dB Units terminator for dbm or dB power data SHIFT blue ke
228. set logical 1 then this condition is enabled for RQS generation If the bit value is cleared logical 0 then the bit is ignored The Request Mask value ranges from decimal 0 to 255 where the decimal value can be determined by summing the decimal values of each Status Byte bitto be enabled the user need not select the RQS bit The default at power on is a Request Mask byte of 00000000 or decimal 0 The Request Mask is reset to the default value at power on only and is not affected by an Instrument Preset NETWORK ANALYZER TRIGGER 8410B This causes an external trigger pulse to be generated for the HP 8410B Microwave Network Analyzer to re phase lock on the present RF signal This is used to insure proper HP IB operation in stepped CW frequency sweeps to guarantee that the 8410B is phase locked at the proper RF frequency after CW settling RESET SWEEP This aborts the present single sweep that is in progress and resets the sweep so that itcan be triggered again This function is enabled only if the 8350A is in the Single Sweep Trigger mode and has the same effect as programming a single sweep trigger T4 TAKE SWEEP This triggers a single sweep This function is enabled only if the 8350A is in the Single Sweep Trigger mode and has the same effect as programming a single Sweep trigger 4 DISPLAY UPDATE ON OFF This selects whether or not the 8350A updates its numeric displays upon further programming of any paramet
229. stal frequency combs of 1MHz usable below 1GHz 10 MHz 50 MHz an external frequency may be input to the rear panel External Marker input The crystal frequency markers can be displayed independent of the mainframe frequency markers in their CRT intensity dot via Z axis control and or RF amplitude dips PANEL LAYOUT MARKER FREQ MHz EXT 1 10 50 lt 1GHz AMPTD INTENS MKR MKR MKR OO FUNCTIONS INDICATORS 1 MHz CRYSTAL Selects light on a crystal frequency comb of markers at harmonics of 1 MHz 10 MHz CRYSTAL Selects light on a crystal frequency comb of markers at harmonics of 10 MHz 50 MHz CRYSTAL Selects light on a crystal frequency comb of markers at harmonics of 50 MHz EXTERNAL FREQUENCY Selects frequency markers at the RF frequencies that are input to the rear panel External Marker input to the rear panel External Marker input Allowable RF power range at input is 10 dBm minimum to 10 dBm maximum INTENSITY MARKER Sets the marker display mode to CRT intensity dots via Z axis control AMPLITUDE MARKER Sets the marker display mode to RF amplitude dips EXTERNAL MARKER INPUT Rear panel input for external frequency marker Maximum drive range 10 to 10 dBm Figure 3 16 Crystal Marker Frequency 83500 series plug ins 1 of 2 43 Operating Information Model 8350A LIMITATIONS CONCERNS l Plug in markers display modes are independent of the 8350A mainframe marker
230. stors Q5 through Q7 are all turned off and the source for the supply is BTI Thus the RAM is kept active when line power is disconnected During the transition between battery backup and internal power for the RAM Q5 through Q7 ensure that does not drop below the battery voltage Instrument Bus Buffer The Instrument Bus Buffer circuit interfaces the microprocessor address data and control lines onto the Instrument Bus which is the main communication bus for the rest of the 8350B except for the front panel circuits U25 is a 3 state bi directional buffer that provides the interface for the eight instrument data lines 100 107 Transfer of data through U25 is enabled when L IBE Low Instrument Bus Enable is active low Addresses 2000 through SFFF Direction of data flow is determined by the logic state of the microprocessor L WRITE control output Low Wnite High Read 3 state buffers 027 and U29 drive the thirteen address lines L 1 0 through L IA12 and the L IRD Low Instrument Bus Read control line associated with the Instrument Bus The logic state of the address lines determine the source destination of the data transfer and the logic state of L IRD determines direction of data flow at the addressed device U27 and U29 are enabled by the L IBE control line Model 8350A 3 state buffer U26 drives the remaining control lines associated with the Instrument bus and is always enabled Table 8 20 lists
231. struments under remote program control Indicates last data transmission during a data transfer sequence used with ATN to poll devices for their status Operating Information Checking device to request service etc Concepts DEVICE A and control e g calculator DEVICE B Able to talk and listen DEVICEC e g tape reader 10 3 26 Eight signal lines form the first set and termed data lines The data lines carry coded messages which reperesent addresses program data measurements and status bytes The same data lines are used for input and output messages in bit parallel byte serial form Normally a seven bit ASCII code represents each piece byte of data leaving the eighth bit available for parity 3 27 Data transfer is controlled by means of an interlocked handshake technique which per mits data transfer asynchronously at the rate of the slowest device participating in that particular conversation The three data byte transfer control lines which implement the handshake DAV NRFD NDAC form the second set of lines 3 28 The remaining five general interface management lines form the third set and are used in such ways as activating all the connected devices at once clearing the interface allowing a 3 29 Definition of HP IB Terms and Able to talk listen Only able to listen e g signal generator DEVICE D Only able to talk
232. sweep 5343A Set to AUTO SWP M and set desired frequency resolution Set the rear panel ACQ TIME switch to MED or FAST 8350A Select the frequency parameter to be measured by pressing the appropriate key START STOP or any marker Mn where n 1 5 and then press SHIFT M2 If the sweep setting is changed or it is desired to exit this mode disable the 5343A by pressing SHIFT M3 on the 8350A front panel Example To measure the START frequency 1 Connect equipment as shown Figure 15 Set the 5343A to AUTO SWP M and set desired frequency resolution Press the 8350A temporarily stop the sweep resolution Local Operation 23 Local Operation Model 8350A APPENDIX 1 REAR PANEL CONNECTIONS For a diagram of the rear panel see Figure 16 POS Z BLANK Positive Z axis blanking signal Supplies a rectangular pulse of approximately 5 into 2500 ohms during the retrace and bandswitch points of the RF output Also supplies a 5V 8 volts for active marker pulse when the RF is coincident with a marker frequency if intensity markers are selected NEG Z BLANK Negative Z axis blanking signal Supplies a negative rectangular pulse 5V into 2500 ohms during the retrace and bandswitch points of the RF output PEN LIFT Output to control the pen lift function of an X Y recorder Maximum pen up level is 40V and maximum pen down sink current is 500 mA at 0 7V SWEEP OUT IN Wired in parallel
233. synchroni zation between 8350A and 8410B HP Part No 08410 60146 20 Model 8350A Local Operation X Y RECORDERS The 8350A is equipped with outputs for controlling X Y analog recorders Some of the HP X Y recorders that may be used with the 8350A are 7010B 7015B 7035B 7004 7034 7044 7045 7046 7047 The available required signals for proper operation with X Y recorder X INPUT Typically SWEEP IN OUT Supplied by BNC connector on front or rear panel Y INPUT Y axis voltage On 8755S Frequency Response Test Set this would be AUX for channel 1 or AUX B for channel 2 For 8410B systems the 8412A display provides amplitude and phase outputs PEN LIFT Signal line for controlling remote pen up down Pen up is open contact or 5 volts Pen down current sink is contact closure to ground or 0 volt Supplied by BNC connector on rear panel or pin 10 on 8350A Programming Connector RECORDER SERVO MUTE 7044 7045 7047 only Control line that mutes the power to the recorder servos for 100 ms at bandswitch when using multi band plug ins or designated points Pin 1 on the 8350A Programming Connector PEN LIFT REQUEST Allows a liftto be initiated by remote control independent of the present pen lift status Pin 3 on the 8350A Programming Connector INVERSE PEN LIFT Inverse function of Pen Lift pin 23 on 8350A Programming Connector The pen lift control line is assigned to a pin on
234. szu o 9 989 0 G e1u 0 OR Tono 58 si houng mewo ET 6 5 8 O Q 5 5 212 Q 8549 6 009 8100 O Pius o 0 Le Feed se G 5152 E S a7 E0 i gt zu ac Y NE 5 age B 5sz2 9 B G isu O Figure 5 2 Location of 201 40V and 10V Power Supply Adjustments 5 6 Model 8350A Adjustments ADJUSTMENTS a MM M 5 12 AIRFLOW DETECTOR ADJUSTMENT REFERENCE A7 Regulator DESCRIPTION The Airflow Detection circuit senses the internal air flow generated by fan and flags the Microprocessor if the airflow is restricted The instrument is allowed to warm up to operating temperature and A7R53 is jumpered by a short to remove the hysteresis from comparator A7R58 is then adjusted until the inputs are balanced which will then cause A7U11 output LPST LOW POWER SUPPLY TEMPERATURE to oscillate LPST is monitored by the A3 Microprocessor and the state ofthe Airflow Detection circuitis sentto the Status Buffer at hexadecimallocation 1000H A Hexadecimal Data Read command M3 is entered which then displays the current Status Buffer state on the FREQUENCY TIME LEDs When the display LEDs oscillate between 00H and 02H indicating LPST is oscillating A7R58 is adjuste
235. t Mask if bit 6 A 719 A IF Service value Testable conditions in 1 gto BIT A 6 1 clude parameter value altered SRQ THEN Srq syntax error end of sweep power failure and RF un leveled 12 Model 8350A Operating Information Table 3 4 The Twelve Bus Messages 2 of 2 8350A Related Response HP iB Appli Message cable Responds to a Serial Poll with one 8 bit byte with the seventh most significant bit bit 6 of bits 0 through 7 set if the 8350A is Requesting Service Status Yes Bit 2 indicates a status change SPE Byte has occurred that can be de SPD tected only by analyzing the extended status byte which is accessible with the Output Status function only P The 8350A does not have the ass 1 No ability to take or pass control Contro of the HP IB 3 35 HP IB Addressing 3 36 Certain messages require that a specific talker and listener be designated Each instrument on the bus has its own distinctive listen and or talk address which distinguishes it from other devices Devices can be listen only talk only and both talker and listener 3 37 Addressing usually takes the form of universal unlisten command device talk address device s listen address es The universal un listen command removes all listeners from the bus thereby allowing only the listener s desig nated by the device s listen address es to receive information The information is sent by the tal
236. t Paneloperation is verified if the front panel displays are operational without the RF Plug in Service 8 17 Service Model 8350A installed Check front panel operation as follows Remove RF plug in Initiate Instrument Preset Error code E001 should be displayed Press START key The 8350A front panel displays should indicate a start stop frequency sweep of 0 MHz to 10 000 GHz Fail Instrument Preset Refer to Table 8 5 for a list of error codes and troubleshooting hints Table 8 8 3504 Error Codes Operator Initiated Troubleshooting Hints Test Function Tested E016 Airflow None Check fan filter 15 clean and clear of obstructions E015 Microprocessor None Refer to A3 Microprocessor and A3A1 PROM board service sheets Troubleshoot using the Free Run test E011 014 RAM SHIFT 07 Refer to A3 Microprocessor service sheet Check RAM power supply and address decoding E007 010 SHIFT 06 Refer to A3A1 PROM board service sheet Check A3A I inter connections with A3 Microprocessor Check address decoding and power supply Troubleshoot using the Free Run test Front Panel Bus SHIFT 08 Trouble may be either the A2 Front Panel Interface or the A3 Microprocessor Refer to the A2 Front Panel Interface service sheet for troubleshooting information Instrument Bus SHIFT 09 Shorted or open Instrument bus lines Isolate to assembly by re moving RF Plugan 4 Marker and Scaling 5 Sweep Gen erator and disconnec
237. t at which the reference sweep voltage is sent to the RF plug in SWEEP OSCILLATOR DIGITAL VOLTMETER TO 4 7 waru IEEE REPE GND ANLG d VTUNE gt ewe WOW 2 WIRE Figure 5 10 Manual Sweep Adjustment Setup EQUIPMENT Sweep Oscillator c HP 8350A Digital Voltmeter DVM see HP 3455A PROCEDURE 1 Remove the RF plug in from the sweep oscillator mainframe 2 Setthe LINE switch to ON and allow the sweep oscillator to warm up for 30 minutes 3 Position the sweep oscillator upright as shown in Figure 5 10 and remove the top cover NOTE The validity of this adjustment procedure is based in part on the accuracy of the sweep time adjustments Proper adjustment of the forward sweep times is necessary before proceeding with this adjustment procedure 4 Connect the DVM to 4 11 VTUNE and A4TP7 GND ANLG 5 Press INSTR PRESET 6 Press SHIFT 0 0 MI 20 1 GHz 9 The FREQUENCY TIME display should indicate C9 This sets the control line outputs from ASUS to the A5 Sweep Generator circuits for a manual sweep condition Model 8350A Adjustments ADJUSTMENTS Model 8350A Ab SWEEP GENERATOR 4 a lt 225 acr a o lt o A4TP11 VTUNE A4 A4TP7 GND ANLG Man Weg wee mee LS me mer Q u 6 5 g Lua amp Ses G 9u E1 O 6 95 0 65
238. tensity Mkr On Off CRYSTAL MARKER FREQUENCY 1 MHz 10 MHz 50 MHz Ext Freq FM INPUT SENSITIVITY 20 MHz V 6 MHz V NOT DEFINED 000000 1 0000001 15 000000 1 0000001 000000 1 0000001 00000000 00000001 00000010 00000011 00000000 00000001 00000000 00000000 00000000 00000000 00000000 00000000 00000000 END OF MODE STRING Figure 3 17 HP IB Only Functions 7 of 7 51 52 HP Part No 08350 90001 Printed in U S A LOCAL PERATION 8350A SWEEP OSCILLATOR MARKER FREQ ER pm ee HEWLETT PACKARD 8350A SWEEP OSCILLATOR Copyright HEWLETT PACKARD COMPANY 1980 1400 FOUNTAIN GROVE PARKWAY SANTA ROSA CALIFORNIA 95404 MANUAL PART NO 08350 90001 Microfiche Part No 08350 90002 Printed AUGUST 1980 LA Packar Model 8350A Local Operation LOCAL OPERATION INTRODUCTION This Local Operation handbook provides information on the local use non HP IB of the 8350A Sweep Oscillator with 83500 series Plug ins Throughout this handbook are blocks of example procedures on implementing some of the information The front panel controls are divided into function groups These groups and and other information topics are arranged in the following sequence GETTING STARTED Brief example of control usage INSTRUMENT PRESET Error codes and preset conditions DATA ENTRY Numeric step units and shift keys FREQUENCY
239. tenuator Performance Tests Model 8350A PERFORMANCE TESTS e 4 13 FREQUENCY RANGE AND ACCURACY TEST SPECIFICATION See Performance Test Record Card in section IV of the plug in manual for frequency range and accuracy specifications DESCRIPTION A frequency counter is used to check frequency range and accuracy in the CW mode The frequency counter is also used to check swept frequency accuracy and markers in the START STOP mode FREQUENCY COUNTER AO eas SWP INTFC A j SWP INTFC B SWEEP OSCILLATOR RF PLUG IN CNTR TRIG STOP SWEEP 500 MHz TO 27 GHz ADAPTER 20 dB ATTENUATOR Figure 4 1 Frequency Range and CW Accuracy Test Setup EQUIPMENT E PR sii HP 83500 series Frequency Counter esee hate HP 5343A 20 dB 8491B Option 020 Adapters Type N male to APC 3 5 female Adapters SHEER REI Type N male to BNC male If another counter is used the swept frequency measurements will require the use of additional testequipment This equipment is listed in the Alternate Swept Frequency Test at the end of this paragraph PROCEDURE NOTE Plug ins having a FREQ CAL adjustment on the front panel require performing the FREQ CAL procedure in section 3 of the plug in manual prior to performance of this test 1 Connect equipment as shown in Figure 4 1
240. ters maximum can be expressed in expo nential decimal or integer form Acceptible numeric formats are referenced in further sections by the following format syntax Exponential 4 44 Decimal d g d g Integer d q Single Digit d Binary String b b Binary Byte b 16 Model 835 0A Where the character d indicates a leading or trailing zero a space or a numeric digit 0 through 9 The Characters indicate a variable number of the previous characters The character b indicates an 8 bit binary byte Numeric values that are not binary in nature are scaled by the appropriate units terminator 3 62 Units Terminator These are 2 character codes that terminate and scale the associated numeric value Frequency values can be entered in GHz MHz kHz or Hz Sweep time values can be entered in Seconds or milliseconds Power values can be entered in dBm or dB If a units terminator is not passed the 8350A assumes the numeric value is in the fundamental units of Hz or Seconds 3 63 End Of String Message EOS This can be the ASCII character Line Feed LF decimal 10 the bus END command EOI and ATN true or another function code string NOTE The HP IB program code syntax typically mirrors that of the local front panel keystroke sequence 3 64 Valid Characters The alpha program codes can be either upper or lower case since the 8350A can accept either type Spaces unnecessary signs
241. tes the five main timing signals The clock oscillator output provides the time base for the state machine operation Eleven consecutive address locations of U12 contain data that define the state of the five timing signals over eleven clock oscillator cycles For each address the lower four bits of data are the logic state of the PROM 01 PROM 02 DBE and AVS signals The four higher data bits address the PROM for the next clock oscillator cycle PROM A0 PROM PROM A2 and IOS IOS is also used by the Address Decoder and Instrument Bus circuits 016 latches and buffers the 012 outputs during each clock oscillator cycle Clock Drivers Clock drivers Q1 Q3 and Q2 Q4 invert and buffer the PROM 01 and PROM 02 to provide the microprocessor US with its two phase clock signals 01 and 02 The drivers are identical so only the circuit for 01 is explained If the PROM 01 input is a logic low Q1 is on and is turned off this causes a high 01 output nominally 5 When PROM 01 changes state to a logic high Q1 is turned off and is turned on this causes 01 to go low nominally 0 2V RC combinations R3 C10 and R54 C37 at the base of Q1 and Q3 ensure fast desaturation of the transistor base emitter junction when the transistor is turned off Without this RC combination the switching speed of each transistor would be much slower Model 8350A Microprocessor D The Microprocessor circuit executes the program stored in ROM to
242. the instrument LINE switch is ON 1 47 An Option 001 Battery Kit may be ordered for standard Model 8350A Sweep Oscillators to upgrade them to Option 001 capability by ordering HP Part Number 08350 60013 This kit contains a battery pack a battery pack hold down clamp and a special A3 Microprocessor board All other necessary wiring and hardware connec tions have been made at the factory on all standard instruments 1 48 Option 400 400 Hz AC Power Operation 1 49 Thestandard Model 8350A requires that the power line frequency be 50 to 60 Hz Option 400 allows the instrument to operate with a 400 Hz ac power line frequency 1 50 Option 907 Front Handles Kit 1 51 Option 907 HP Part Number 5061 0089 contains a pair of front handles and the necessary hardware for mounting the handles to the Model 8350A Refer to Section II of this Operating and Service Manual for a detailed description of this kit and instructions for installation N Model 8350A 1 52 Option 908 Rack Mount Kit 1 53 Option 908 HP Part Number 5061 0077 contains a pair of flanges and the necessary hardware to mount the Model 8350A in an equipment rack with 482 6 mm 19 inches hori zontal spacing Refer to Section II of this Oper ating and Service Manual for a detatiled descrip tion of this kit and instructions for installation 1 54 Option 909 Rack Mount Front Handles Kit 1 55 Option 909 HP Part Number 5061 0083 contains
243. the instrument automatically goes through an internal self check routine to verify proper instru ment operation If certain errors or failures are detected during the self test or in normal operation they are indicated via error codes displayed on the far left digital display An INSTRument PRESET condition is then set which automatically presets the sweep oscillator to full RF plug in band sweep operation 1 23 Accurate High Resolution Data Entry 1 24 Accurate high resolution digital displays indicate all major function values Function values may be set by activating the appropriate pushbutton and using the corresponding knob step keys or data entry keyboard to enter the desired values 1 25 Sweep and Trigger Modes 1 26 The sweep may be triggered INTernally through ac power LINE frequency EXTernally or in SINGLE sweep operation SWEEP TIME is continuously variable from 10 ms to 100 seconds Minimum sweep time may be greater than 10 ms depending upon the specific RF plug in used and the bandwidth being swept A MANual SWEEP function allows the data entry controls to provide continuous manual adjustment of frequency between the end frequencies set in any of the sweep functions A direct coupled sawtooth sweep ramp zero to approximately 10 volts is available through both front and rear panel SWEEP OUTPUT SWEEP INPUT BNC connectors 1 27 START STOP Mode 1 28 TheSTART STOP frequency sweep mode selected upon Instrum
244. this mode the 8350A numeric displays are blanked and the Micro Learn String bytes are used to pre load the appropriate internal DAC s For proper operation the 8350A must be in the CW mode and the plug in CW Filter capacitor should be off Since the Micro Learn String overrides the present values of the 8350A when it is input do not program any functions while in this mode Ifa function is programmed one of two things may occur 1 the 8350A may exit the Input Micro Learn String mode with the previous sweeper settings restored or 2 the 8350A may interpret the program codes as another Micro Learn String and cause the instrument to enter a non predicatable state The only function that is valid for execution while the Micro Learn String is in effect is the Network Analyzer Trigger function To output the Micro Learn String 1 program the desired CW frequency 2 program the OX code then 3 read the 8 byte string To input the Micro Learn String program the IX code and the 8 byte string When the user desires to exit the Input Micro Learn String mode and return to the normal mode of operation the user must exit properly When in the Input Micro Learn String mode the 8350A accepts the input program code bytes in a special binary entry mode The mode is exited by programming Figure 3 17 HP IB Only Functions 1 of 7 2 45 Operating Information Model 8350A the8350A with a function code that does not start with a
245. ting RF Plug in interface cable W4 trom the 8350A Motherboard If E005 still occurs refer to the A8 HP IB service sheet for further troubleshooting Power Supplies Check power supply LEDs on the A7 Regulator to determine faulty power supply Cycle power on and off with the RF plug in removed to determine if the problem is caused by the 8350A or the RF Plug in Check appropriate fuses TV Marker SHIFT 10 Trouble is probably with the A4 Scaling and Marker assembly Refer to the A4 service sheet for further troubleshooting Sweep Marker SHIFT 11 Marker circuit was verified in previous test Check VRAMP output from 5 Sweep Generator Ramp should go from to about 4 2V in 3 steps If VRAMP 1s verified refer to A4 Scaling and Marker service sheet If VRAMP 15 not verified refer to AS Sweep Generator service sheet RF Plug in Bus SHIFT 12 Open Instrument Bus between 8350A and RF Plug in Digital Interface assembly Ensure RF Plug in is installed and making good contact Check RF Plug in interface cables Check RF Plug in cables are making good contact Refer to RT Plug in Digital Interface service sheet for further troubleshooting If 11869A Adapter is installed refer to Adapter Al Logic service sheet for further troubleshooting
246. ual supplement at the end of the LOCAL OPERATION manual ADJUSTMENTS Page 5 4 Table 5 4 Delete reference to assembly A3AI REPLACEABLE PARTS Page 6 8 through 6 10 Table 6 2 Substitute the attached Microprocessor Board Assembly Replaceable Parts List Page 6 10 and 6 11 Table 6 2 Delete all references to A3Al PROM Assembly Page 6 14 Table 6 2 Add ASCRI14 HP Part Number 1901 0954 CD6 QTY 1 DIODE CUR RGLTR 1N5285 270uA DO 7 28480 1901 0954 Change ASCR to HP Part Number 1906 0268 5 QTY 1 D 2 GP 30V 20mA 71 28480 1906 0268 Page 6 15 Table 6 2 Delete ASR23 Page 6 16 Table 6 2 Delete ASR72 Page 6 17 Table 6 2 Delete 5 14 Page 6 21 Table 6 2 Change A8U6 HP and Mfr Part Number to 1820 2748 CD8 SERVICE Page 8 1 Table 8 1 Delete all references to 1 Assembly Page 8 28 and 8 41 Front Panel Interrupt Timer and Interrupt Control Delete reference to A3TP29 and replace with L IBIRQ A3P2 33 Delete reference to A3TP31 and replace with A3P2 20 Model 8350 Page 8 44 through 8 56 A3 MICROPROCESSOR CIRCUIT DESCRIPTION Replace the A3 MICROPROCESSOR CIRCUIT DESCRIPTION with the A3 MICROPROCESSOR CIRCUIT DESCRIPTION from this manual supplement Page 8 57 and 8 58 Replace Figures 8 25 through 8 29 with Figures 8 25 through 8 29 from this manual supplement Delete A3A1 PROM BOARD CIRCUIT DESCRIPTION including Table 8 23 and Figure 8 30 Page 8
247. ug in This information is packed and encoded for minimal storage require ments thereby making data analysis difficult If data analysis is necessary use the Output Mode String and Output Interrogated Parameter functions instead When output from the 8350A and stored in an ASCII character data string the Learn String can later be input to the 8350A to restore that instrument state The length of the Learn String is fixed independent of the functions selected and the plug in used The Output Learn String function learns the present sweeper settings only To learn the storage register settings sequentially recall each storage register then learn the present sweeper settings Likewise to restore the storage registers input the learn string for the appropriate storage register then save the present sweeper settings in the proper register INPUT OUTPUT MICRO LEARN STRING A string of 8 bytes of binary data that completely describes the present CW Frequency Vernier Sweep Output voltage and Power Level of the 8350A and 83500 Series Plug in This information is packed and encoded for minimal storage requirements thereby making data analysis difficult When output from the 8350A and stored in an ASCII character data string the Micro Learn String can later be input to the 8350A to restore the instrument state for rapid CW frequency programming The length of the Micro Learn String is fixed independent of the functions selected and the plug in used In
248. utput data are Hz dBm dB or sec implied with the function selected OUTPUT STATUS The 8350A outputs 2 sequential bytes 8 bits wide that indicate the present instrument status The first status byte is equivalent to the Status Byte of the Serial Poll the Status Byte Message the second status byte is the Extended Status Byte which provides additional information See the Status Byte Information table for a description of each Status Byte Status Byte values are cleared upon execution of a Serial Poll the Status Byte Message Device Clear the Clear Message and or Instrument Preset function command Status Byte Information Table STATUS BYTE 1 e Ieee a DECIMAL VALUE FUNCTION REQUEST SRQ on SRQ on SERVICE Change in Numeric 605 Extended Parameter Status Byte Altered to Default Value EXTENDED STATUS BYTE 72 E DECIMAL VALUE FUNCTION Airflow RF Power Self Test Failure Unleveled Failure on Failed Bit Functions not usable with 86200 Series Plug ins and 11869A Adapter Figure 3 17 HP IB Only Functions 2 of 7 46 Model 8350A Operating Information SERVICE REQUEST MASK This determines which bits within the 8350A Status Byte byte 1 can cause the 8350A to send a Request Service RQS Message to the HP IB controller The Request Mask is a one 8 bitbyte value where with each bit position corresponds to thesame bit position as in the 8350A Status Byte If in the Request Mask byte a bit is
249. ve in sweep modes PANEL LAYOUT ON OFF FUNCTIONS INDICATORS RF ON OFF This function switches RF power on light on or off 230dB attenuation CW FILTER ON OFF This function enables light on or disables the oscillator tune voltage filter when in CW or manual sweep modes only LIMITATIONS CONCERNS 1 CW filter not enabled during sweeps LOCAL FUNCTION PROCEDURE REMOTE FUNCTION PROCEDURE Mod ENS Code ode mene Roslin Power Power Off RFO Filter On EH CW Filter Filter Off Figure 3 14 Signal Control 83500 series plug ins Model 8350A Model 8350A Operating Information ALC MODE DESCRIPTION This functional block controls all Automatic Leveling Control ALC functions of the output power Several modes of ALC can be selected these are Internal External via a Crystal Detector or external via a Power Meter PANEL LAYOUT ALC MODE INT EXT MTR OUTPUT INPUT CAL A EXT MTR acc FUNCTIONS INDICATORS INTERNAL ALC This selects the internal crystal detector coupler for leveling the output power at the front panel output connector EXTERNAL ALC This selects the external crystal detector for leveling with the detector output applied to the front panel External ALC BNC input connector METER ALC This selects the external power meter for leveling with the power meter output applied to the front panel External ALC input connector EXT MTR ALC INPUT
250. w enough to insure phase locking over entire sweep range 19 Local Operation Model 8350A 8412A 84108 PHASE MAGNITUDE 8350A SWEEP 83500 NETWORK ANALYZER DISPLAY OSCILLATOR SERIES PLUG IN FREQ REF 052 BLANK BLANK NEGZ BLANK Swe IN OUT SOURCE CONTROL 1 e 84 INPUT 8411A HARMONIC 418 8414A FREQUENCY AUXILIARY POWER SUPPLY POLAR DISPLA CONVERTER Y BLANKING 8743A REFLECTION TRANSMISSION TEST SET UNKNOWN RETURN Figure 13 8350 Connections to 8410 Notes on connections FREQ REF output of the 83500 or 86200 series Plug ins provides a 1 volt per GHz output so that the 8410B may synchronize with the sweep The8410B display units 8412A 8414A require that the NEG Z BLANK from the 8350A be used as the blanking signal 9 POS Z BLANK from the 8350A line contains the Z axis markers This line connects to the MARKERS input on the 8414A Polar Display and to the Z AXIS input on the 8412A Phase Magnitude Display SWEEP OUT IN outputs a 0 to 10 volt signal in proportion to the swept or CW frequency output corresponds to the lower frequency sweep limit 10V to the upper Swept RF output causes a ramp voltage out CW output causes a dc voltage out This connection is necessary only when using 8412A Phase Magnitude Display 8350A 8410B SOURCE CONTROL CABLE Provides handshake lines for
251. wable HP IB addresses are from 0 thru 30 However the value 21 is typically reserved for the controller and should be avoided The HP IB address set remains in effect until line power is turned off At power turn on the internal HP IB address switches are read and used as the address unless 8350A Option 001 is used If Option 001 is used the address will remain unchanged If an instrument problem occurs Section 8 of the manual contains some operator initiated tests These tests may isolate problems to enable service via blue tag to repair them faster LOCAL FUNCTION PROCEDURE Range and On Off Resolution Select HP IB Address Instrument Preset Address entered only after pressing the GHz MHz or dBm keys REMOTE FUNCTION PROCEDURE Use HP IB Command Select 3 Address Not Available Instrument Instrument Preset Preset Command Figure 3 7 Instrument State 2 of 2 25 Operating Information 26 FREQUENCY Markers Sweep TIME Marker Transfer DESCRIPTION The frequency marker functions consist of up to five independent and contiuously variable frequency markers The Marker A function displays the difference frequency between any two markers CF sets the effective sweep center frequency CF equal to the active marker frequency MARKER SWEEP initiates exits sweep between Marker 1 and Marker2 After exit sweep returns to original sweep limits
252. weep time accuracy for sweep times from 1 second to 100 seconds MANUAL Sets sweep ramp accuracy in MANual sweep mode SQUARE WAVE Sets internal AM 27 8 1 kHz oscillator frequency accuracy 20 Adjusts 20V REG power supply 10V Adjusts 10 REG power supply 40V Adjusts 40V REG power supply AIRFLOW BAL Adjusts airflow detection circuit temperature threshold Table 5 2 Factory Select Components Reference Adjustment Allowahle Basis of Selection Designator Paragraph Range of Values not critical Selected to set the retrace time for a 10 ms sweep to insure repetitive sweeps on LINE SWEEP TRIGGER not critical Selected to set the output voltage level of the 5 power supply under a no load condition Model 8350A Adjustments Table 5 3 HP Part Numbers of Standard Value Replacement Components RANGE 10 to 464K Ohms TYPE Fixed Film WATTAGE 125 at 125 C TOLERANCE 1 0 Val Value Value 0757 0443 0757 0444 0757 0289 0698 3156 0757 0447 0698 3136 0698 3157 0698 3442 0698 3132 0698 3443 0698 3444 0698 3445 0698 3446 0698 3447 2 0698 0082 7 0757 0199 01570597 0 0757 0416 7 0698 3158 0757 0379 1 0757 0417 8 0698 3159 5 0698 3427 0 0757 0418 9 0698 3449 6 0698 3428 1 0757 0419 0 0698 3160 8 0757 0382 6 0757 0420 3 0757 0123 3 0757 0294 9 0757 0421 4 0698 3161 9 0698 3429 2 0757 0422 5 0698 3450 9 0698 3430 5 0757 0280 3 0698 3162 0
253. witch which must be preset prior to operation in Internal square wave modulation is selected by the Model 8350A This is a multiple switch with the front panel J MOD pushbutton Modu individual switches that correspond to various RF 2 6 e Model 8350A LNDAC LSRO LATN SHIELD HP IB CONNECTOR J4 as viewed from rear of instrument 10105 10106 10107 10108 LREN 0 TWISTED PAIR WITH 6 0 TWISTED PAIR WITH 7 0 TWISTED PAIR WITH 8 0 TWISTED PAIR WITH 9 P 0 TWISTED PAIR WITH 10 Ss P O TWISTED PAIR WITH 11 SIGNAL GROUND CONNECTED TO EARTH GROUND HP 1B Logic Levels True low State lt 0 8 Vdc False high State gt 2 4 Vdc MNEMONICS TABLE L DIO thru 8 L EOI L IFC L NDAC L NRFD L REN L SRQ LOW Attention control line LOW Data Valid Control line LOW Data Input Output lines LOW End Or Identify control line LOW Interface Clear control line LOW Data Not Accepted control line LOW Not Ready For Data control line LOW Remote Enable control line LOW Service Request control line Figure 2 5 Connector Signals and Pin Configuration Installation GROUNDED NEAR TERMINATION OF OTHER WIRE OF TWISTED PAIR Installation plug in functions such as FM sensitivity selection FM input coupling selection direct coupled or cross over RF power level at instrument power on and Option 002 Step Attenuator operation Refer to the Operating and Service
254. with a jumper from TP11 Check each line at one of the Data Bus terminations e g U22 or U25 for the L 10 signal Also check all other data lines for adjacent shorts Front Panel Bus The Front Panel bus is controlled by two buffers on the A3 Board U32 is a uni directional inverting buffer that is always enabled to pass five address lines and three control signals In the Free Run Mode the addresses cycle in binary sequence so the divide by two sequence should be observed continuously 0 through FPA4 FPE should show occasional bursts of activity being an inverted version of L FPE shown in the Address Decoder Timing Diagram L FPRD should remain in the low read state and L FPSTB should strobe at roughly 973 kHz 022 is a bi directional 3 state buffer passing 8 bits of data In the Free Run Mode this buffer is periodically enabled by L FPE to read in data Refer to the Address Decoder Timing Diagram Data is never written since L WRITE stays high The buffers can be easily tested by using L A10 TP11 as an artificial source of data during Free Run Pull the A2 Board out of the Motherboard to disconnect its data drivers Connect TP11 to one of the Front Panel data lines FPDO FPD7 the extender board pins are convenient Trigger the oscillo scope off L FPE and observe the corresponding data line on the micro processor side using the Data Bus test pins The L 10 signal should pass through the buffer only when L F
255. with sweep out in BNC connector on front panel See Display Functions Control group for a description CNTR TRIG Counter Trigger HP 5343A Frequency Counter only Output for controlling the external trigger input of the HP 5343A frequency counter STOP SWEEP Input for stopping the progress of a forward sweep When input is 0 to 0 8 volt sweep is stopped RF outputis a constant CW frequency Sweep continues when input voltage returns to greater than 2 volts or open circuit Usable with the 5343A Frequency Counter and CNTR TRIG to select and measure frequency points along the sweep FM INPUT Input for frequency modulation or phase lock error signal for the plug in This o input is passed through to the plug in and processed by the plug in only See plug in specifications for frequency deviation and sensitivity AM INPUT Input for external amplitude modulation of the plug in This input is passed through to the plug in See plug in specifications for amplitude input range ALT SWP INTERFACE Connects via cable HP Part No 8120 3174 to 8755C to provide Alternate Sweep function PROGRAMMING CONNECTOR See Figure 16 for pin designation 24 Model 8350A PROGRAMMING CONNECTOR Local Operation 95 eid s Arm Programming Connector Marker Pulse Pen Lift Request Sweep Alternate Stop Fwd Sweep Request 5 Volt 100 ma MAX RF Blanking RF Blank Request Ext Trigger Input
256. y This function enables the shift functions that are labeled in blue on the front panel or required key code in remote HP IB LIMITATIONS CONCERNS 1 Step size not settable for sweep time It is a 1 2 5 data progression like 10 msec 20 msec 50 msec 100msec etc 2 No visable data display for step size values 3 Step size entry is differentiated via units terminator ie frequency or power step 4 Allnumericentries are not input entered until the appropriate units terminator is entered 5 Auto Step via depressing up or down key causes the active parameter to be stepped as long as the key is depressed 6 The dBm dB key will be a default value of Hz or sec Figure 3 11 Data Entry Step Keys Keyboard 1 of 2 34 Model 8350A Operating Information 7 Negative numeric data must be entered with negative sign first 8 Blank and unnecessary negative signs are ignored by the sweep oscillator 9 Some shift functions are not labeled on the front panel References Shift Function section 10 Shift key indicator on until a correct shift function key stroke is entered 11 The default Step Size values are 0 1 of the present AF for frequency parameters 1 dB for power parameters LOCAL FUNCTION PROCEDURE Range and Resolution STEP SIZE Frequency Frequency Parameter See plug in aren frequency limits Resolution STEP SIZE Power jl See plug in power limits Resolution Reset to default STEP S
257. y upward in frequency centered on the CF Center Fre quency setting AF Frequency width of sweep Continuously adjustable from zero to 100 of frequency range START STOP and CF AF modes can be interchanged without affecting RF output AF Accuracy Refer to RF plug in unit specifi cations CF Accuracy Refer to RF plug in unit specifica tions CF Resolution 0 02496 4096 points across band AF Resolution 0 196 of full band 1024 points across band 0 01296 of full band for 1 8 band or less 8192 points across band 0 001596 of full band for 1 64 band or less 16 384 points across band Display Resolution 5 digits maximum CW Operation Single frequency RF output When changing between CF AF and CW mode the CW frequency and the Center Frequency CF are equivalent CW Accuracy Refer to RF plug in unit specifi cations CW Resolution Same as CF Vernier Adjusts CW frequency of swept range up to 0 05 of RF plug in band being swept The vernier adds its value to the appropriate fre quency parameter and then resets to zero when the adjustment exceeds 0 05 for continuous adjustment The 740 LED is on whenever a vernier adjustment value is present Vernier Resolution 4 ppm 64 points between each CW point 262 144 points across band Offset Allows the CW frequency or center frequency of swept range to be offset by any amount up to the full range of the RF plug in After entering a
258. ys the response due to the current front panel setting while channel 2 displays the response to the setting stored in memory location n The front panel controls of the 8350B are enabled and the current sweep setting may be altered if necessary Figure 22 Typical Test Setup Using 8756A 9 10 Model 8350A 5VF U25A L SFSRQ 5VF U25B R55 10k P1 34 0UT 3 4 y ALT 5VF PI 33 0UT 5 SWEEP RAMP GENERATOR MANUAL 10 MS 999MS SEC 100 L EX SWP INT LAMP DBPE L CLAMP DISABLE L RESET L SNGL L ABORT L SFSRQ P O Figure 8 43 1 of 2 A5 Sweep Generator Schematic Diagram Block D Replacement A 11 12 Model 8350 10 C46 REF FL 01 Figure 8 43 1 of 2 A5 Sweep Generator Schematic Diagram Block D Replacement B TPI5 P O Figure 8 43 1 of 2 AS Sweep Generator Schematic Diagram Block E 13 14 Reference Designation ul 2 2 nil HiCe nic HIL nibll niCie 3013 HC El nical 3 24 Hales HP Part Number 0161 2214 4181 2214 8180 1229 0161 2155 0164 2208 0161 2106 0160 2158 0 0 1141 1192 lil4U ti1 2 16 3456 4151 2456 Uleli 4naa 1 Ule zUES 0160 2055 151 2055 0150 2055 0160 2155 01 0 2055 2 55 5 55 1 0 2055 16 2055

8350A Sweep Oscillator Operation and Service Manual

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