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HP 8711A Service Manual

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1. How to Remove the Receiver Assembly 9 III A6 POWER SUPPLY ees s n n How to Remove the Power Supply Assembly eeeeeee A7 DISPLAY ASSEMBLY How to Remove the Display Assembly 0 cece eee cece III A8 FLOPPY DISK DRIVE How to Remove the Disk Drive CABINET AND MISCELLANEOUS PARTS esses nnn POST REPAIR PROCEDURES HP 8711A Contents 7 3 7 3 7 4 7 5 7 6 7 8 7 8 7 10 7 11 7 11 7 12 7 13 7 14 7 14 7 15 7 17 Overview and Preventive Maintenance INTRODUCTION This Service Manual is a complete guide to servicing the HP 8711 RF network analyzer It is part of a manual set which includes operating and programming inf
2. 3 30 Step 2 Updating or Restoring Firmware 3 31 Step 3 Installing Correction Constants from Disk eee cece cece ence eee e teens 3 31 Step 4 Loading Correction Constants from Disk leues 3 31 ii Contents HP 8711A TROUBLESHOOTING 8711A SYSTEM TROUBLESHOOTING eene hh menn 4 1 General Notes sa a LO RE ITE Dees E MET 4 1 Initial Observations lt gt Dude wee e e esie ERSTER 4 1 Operator s Check en pna gO SA eR Tee 4 2 TROUBLESHOOTING PERIPHERAL PROBLEMS 0 20 0 00 enhn 4 2 DIN Keyboard seeker hara Ree E rr Sled re rmt m Eme metre 4 2 RS 232 Printers and Plotters cece cee cee 4 2 Centronics Printers and Plotters 22 ee cee cee hh 4 3 HP IB Systems 0 cee cece cece eee eee HH hehe nn 4 3 HP IB Problems with Printers or Plotters 2 2 2 ccc cece cece eee 4 3 HP IB Problems with Disk Drives 0 cece cece ce cect hh Hh nn 4 3 General Checks for HP IB Systems e eee II 4 4 TROUBLESHOOTING THE ANALYZER 0 0 cece ence mem nnn 4 5 General Notes eese arr nur bee ve en PE mter era Se RT Ee RS Saks 4 5 TROUBLESHOOT
3. MHZ 50 T Overview and Preventive Maintenance 1 3 Figure 1 2 HP 8711A Service Test Equipment 2 of 2 Recommended Model 2 Instrument Required Critical Specifications or HP Part Number P Power Splitters 50 ohm Freq 300 kHz to 1 3 GHz HP 11667A Tracking between outputs lt 0 15dB Input SWR s 1 15 Equivalent output SWR 1 10 Freq 300 kHzto 1 3 GHz HP 11850D1 Tracking between outputs s 0 2 dB Equivalent output match 30 dB Input port match 20 dB Nominal insertion loss lt 8 dB Type N Cables 50 ohm 2 Retum loss 24 dB 8120 4781 75 ohm Retum loss 24 dB 8120 2408 BNC cables 50 ohm 8120 1839 75 ohm 5063 0061 175 MHz Bandpass Filter Passband in the range of 0955 0598 300 kHz to 1 3 GHz included with HP8711 Adapters Type N m BNC f 2 required 50 ohm 1250 1476 1250 0780 1250 1535 Type N m N m 1250 0778 1250 1475 Type N MN _ 85036 60014 p o 85036B BNC m N f 1250 0077 kit Sve ny ENT Dual Output DC Power Supply 2 independent supplies 10V 1 Needed only for instruments with option 1EC 75 ohm 2 Use Column O Operator s Check P Performance Tests A Adjustments T Troubleshooting AT 1 4 Overview and Preventive Maintenance Performance Tests This chapter contains manual and automated procedures that show you how
4. HP 8711A Network Analyzer Power Meter Minimum Loss Pad Type N Adaptor Cables i Minimum Loss Pad 75ohm Power Sensor Lr TA m Attenuator b For 75 ohm Systems Figure 2 11 Initial Setup for Dynamic Accuracy 2 36 Performance Tests Connect the equipment as shown in Figure 2 11 and press on the analyzer If you haven t already done so load the automated performance tests software as described in Loading and Running the Test Software located earlier in this chapter Press the cursor keys to move the arrow pointer to the dynamic accuracy test and press Press any key to continue to the power sensor cal factors menu Move the arrow pointer to the device you will use to input the power sensor calibration factors Press Read disk can only be selected if you are using a sensor for which you ve already saved a calibration factor table If you selected Read Disk another menu appears that allows you to choose the serial number of a power sensor that has an available calibration table Move the arrow pointer to your choice and press The program returns you to the power sensor calibration factors menu If you selected Keyboard Entry Edit a list of calibration frequencies are displayed on the controller screen Press and enter the calibration factor for the frequency at the top of the list The calibration factors are taken from the label on your power sensor
5. Power 13 dBm max min Power 47 0 dBm max min Power z 0 dBm max min Power 20 dBm 0 12 dB max min Power 60 dBm max Power Hole Check Pass Fail Pass Fail Power 10 dBm Power 60 dBm Broadband Frequency Response Typical Response Maximum value Minimum value 1 Using equipment and procedures documented in this manual Assumes 20 dB attenuator used in compression test had data measured on an HP 8753 system with full 2 port calibration 2 62 Performance Tests 750 STANDARD HP 87114 Test Record 3 of 4 Number Report Number Test Minimum Measured Maximum Measurement Test Description Specification Specification Uncertainty Frequency Range and Frequencies 300 kHz 299 9985 kHz 1 MHz 0 999995 MHz 5 MHz 4 999975 MHz 10 MHz 9 999950 MHz 50 MHz 49 99975 MHz 100 MHz 99 99950 MHz 500 MHz 499 9975 MHz 1000 MHz 999 9950 MHz 1300 MHz 1299 9935 MHz 0 0015 kHz 0 000002 MHz 0 000007 MHz 0 000011 MHz 0 000064 MHz 0 000127 MHz 0 000632 MHz 0 001260 MHz 0 001586 MHz 300 0015 kHz 1 000005 MHz 5 000025 MHz 10 000050 MHz 50 00025 MHz 100 0005 MHz 500 0025 MHz 1000 0050 MHz 1300 0065 MHz Dynamic Range Compression 7 dBm Noise Floor Narrowband Mode 300 kHz to 5 MHz 5 MHz to 1 3 GHz Broadb
6. Tests front panel control processor Replace CPU board or check U136 U138 Floppy Disk controller FAILED Error number num Floppy Disk Controller Error Tests controller chip accesses registers writes commands and verifies response Replace CPU or check U140 Troubleshooting 4 11 Table 4 1 HP 8711 Self Tests 4 of 4 Applicable Error amp Nn HP IB Interface Error HP IB test FAILED Data bit error on these bits followed by list RS 232 Interface Tests HP IB interface writes to chip and verifies response Test not DIN Keyboard Interface done if anything connected to HP IB 23 Centronics Interface Replace CPU board or check U9 U10 U34 Errors RS 232 interface test FAILED Bus error Cannot access Data bit error on these bits fol lowed by list Tests RS 232 DUART chip accesses registers on chip checks for clock input Replace CPU board or check clock U4 DUART chip 05 Errors 8042 DIN Keyboard test FAILED Problem with DIN Keyboard Power Supply Check Fuse Tests DIN keyboard control processor Replace CPU board or check clock Y53 processor U13 Errors Centronics port test FAILED Strobe bit error Printer reset bit error Printer select bit error Test writes to and reads back 3 printer control output lines Replace CPU board or check U2 U3 U35 Higher numbered tests are not run during po
7. UPPERIower case characters are used to indicate the short form upper case of a given mnemonic The remaining lower case letters are the rest of the long form mnemonic Either the short form or the long form may be used Softkey SCPI Commands This section lists the service menu keys in the order they appear on the menu map See Figures 5 1 and 5 2 Each softkey is shown with its corresponding short form SCPI command Some SCPI commands not correspond directly to a softkey These are listed in the alphabetical command summary following this list which also lists the long form of each SCPI command Keystrokes SCPI Command _ TEST SEL num TEST SEL num TEST STAT RUN Meas Cal Options Menu SENS 1 2 CORR STAT lt ON 1 OFF 0 gt Update Com Costes S DIAG CCON STOR DISK DIAG CCON STOR EEPR aah eee ee eis eee DIAG CCON LOAD 5 14 Service Key Menus Alphabetical 5 Command Summary This section contains the service related HP IB mnemonics recognized by the HP 8711A with a short descrip tion of each All commands have a query form unless specified in the Form column as command only or query only To change a command into a query add a 27 The Form column also gives the parameter type returned by the instrument in response to a query NR1 inte gers NR2 floating point numbers with explicit decimal point and NR3 floating point number
8. Check switch setting on S2 All switches should be open up except for switch 1 if bank contains 256KB SIMMs switch 2 if bank 0 con tains 1 MB SIMMs or switch 3 if bank 0 contains 4 MB SIMMs Use of 4 256K SIMM DRAMs is not supported If problem persists replace CPU or check the following Control circuitry U31 U38 Data buffers U76 U77 Address MUX 050 U74 075 340x0 GSP Processor Performs a test of the TMS 34010 system processor Tests the video 7 GSP Video Tests the video circuitry the video Tests the video circuitry number not used Test number not used because test status LED powers up with this as default An 8 on the LED indicates the 68020 was unable to power up and execute basic instructions DSP SRAM Replace CPU or check SRAM chips U79 and U94 and chips U73 U41 U85 U93 U60 and U89 E 320C25 DSP Processor Test not implemented 68020 amp 320C25 Test not implemented Communication Errors same as for test 4 Checks program SRAM used by the digital signal processor Typical memory size about 32768 bytes 4 10 Troubleshooting Table 4 1 HP 8711 Self Tests 3 of 4 Aspice E Rote Errors Reference clock not toggling Non volatile SRAM Unable to gain control of DSP bus Cannot perform backplane bus tests Access error wrote lt num gt
9. 3 Ifyouare NOT going to make any more adjustments finish with the procedure titled To Permanently Store CCs in the Analyzer part of Storing and Recalling CCS at the end of this chapter 4 If you ARE going to make more adjustments save the correction constant data that you ve generated so far Insert a formatted disk into the internal disk drive Press This creates a file or writes over an existing file with the name data 3 24 Adjustments R FREQUENCY RESPONSE CORRECTION ADJUSTMENT This procedure shows you how to correct for frequency response errors in R measurements If you press the key during this adjustment the analyzer will abort the test Recommended Model or Part Number Equipment 50 ohm std 75 ohm opt 1EC Type N m Termination HP p n 00909 60009 HP p n 00909 60019 1 Connect a termination included in the HP 85032B E or 85036B E calibration kit to the REFLECTION port 2 Press SYSTEM The analyzer displays a message and presets when the test is complete 3 Ifyouare NOT going to make any more adjustments finish with the procedure titled To Permanently Store in the Analyzer part of Storing and Recalling CCS at the end of this chapter gt 4 Ifyou ARE going to make more adjustments save the correction constant data th Insert a formatted disk into the internal disk drive Press 2 This creates a file or writes over an exis
10. 8 2 S 8 3 26 Adjustments Controller Disk Drive Thinkjet Printer HP 8711A Switch Driver Function Power Meter Network Analyzer optional Generator Adapter BNC m to N f to Type N m Power Power Sensor Divider N f to yen Gables Figure 3 10 Setup for B Amplitude Correction with 50 ohm Equipment Controller Disk Drive Thinkjet Printer Power Meter N f HP 8711A Ad BNC m to N f Power Splitter Power Minimum Loss Pad 500 Type N Cables Sensor use with 8481D Sensor Only Figure 3 11 Setup for B Amplitude Correction with 75 ohm Equipment Adjustments 3 27 1 Connect the equipment as shown in Figure 3 10 or Figure 3 11 depending on the impedance of the HP 8711 you are adjusting Do not connect the power sensor to the divider or splitter since you will calibrate the the power meter during the adjustment 2 Refer to the procedure in Loading and Running the Test Software in the Performance Tests chapter to load and run the performance test adjustment software Choose 1 when asked to select which device you want to test 3 Select PERFORMANCE amp ADJUSTMENT TESTS from the main menu displayed on the controller screen 4 The program asks you to input some information if a data file does not exist for your analyzer Follow the prompts to enter the information data file does exist t
11. Incorrect Data Check adapters cables and test port connectors for damage Gage the test port connectors Make sure that the cables between the source and receiver boards are properly connected Perform the following receiver corrections found in the Adjustments section of this manual as indicated by where the data problems occur If the problem is in both narrowband and broadband mode refer to the Adjust ments section to determine the proper order for performing the tests Narrowband mode problems Switched Gain Correction B Amplitude Correction Transmission Correction Reflection Correction Broadband mode problems Switched Gain Correction External Detector Correction R Amplitude Correction R Frequency Response Correction B Amplitude Correction 4 16 Troubleshooting If data seems to drift check Press SYSTEM OPTIONS The marker value should be less cable between the reflection and transmission ports Press The marker value should be less than 12 dB If these are bad replace the receiver assembly Test port cable can also cause drift 5 dB Remove the load and connect a through If data is okay with just a through cable connected after preset but bad in an application check for the following Verify that you are looking at the expected measurement especially check Data vs memory or data memory display Channel 1 vs channel 2 data trace Channel 1 vs channel 2 y axis lab
12. Performance Tests section of this manual It is a simple test ofthe analyzer s measurement capability If the test passes and peripherals are not involved duplicate the operat ing conditions under which the system failed and refer to Troubleshooting the Analyzer if the problem reap pears Troubleshooting Peripheral Problems DIN Keyboard If a DIN keyboard interface test failure was reported during power up there may be a problem with the 5V power supply for the DIN keyboard Disconnect the keyboard remove the CPU board and check the 5V fuse next to the DIN connector If necessary replace it with the spare fuse provided Verify that the keyboard is connected properly Make sure that the keyboard is compatible with the HP 8711 The analyzer should work with HP DIN keyboards that are U S English versions and most but not all IBM PC AT compatible keyboards Refer to Installing the HP 8711 in the Operating and Programming manual for a part number of keyboard that definitely works with the HP 8711 Connect the keyboard to a computer or another analyzer to see if it is functioning or try using a different board If the keyboard works with other instruments replace the CPU board RS 232 Printers and Plotters If an RS 232 interface problem was reported during power up with no peripheral connected there may be a problem with the RS 232 DUART chip U5 or its 3 6864 MHz clock U4 Replace the CPU board or refer to th
13. cece cece ene eran e eher 4 19 HP8711A OVERALL BLOCK DIAGRAM cece hh hh hn 4 20 SERVICE KEY MENUS INTRODUCTION VET RT E ed ee POUR nase Aa E Tara 5 1 INTERNAL DIAGNOSTICS AND ADJUSTMENTS SUMMARY 5 1 INSTRUMENT SETTINGS MENU 8 eee hh nnn 5 2 TESTS AND ADJUSTMENTS MENU 0 0 eee enhn hh nnn 5 2 SELE TESIS 4 9 de wie etel Er E DERUS Sate hie lee RAE ME Que ates 5 2 ADJUSTMENTS 1 pere Or he UE T ab sae ares cate Sea e Regn les 5 4 HP 8711A Contents iii SERVICE MODES SUMMARY ssselllsssslss he m hh nn 5 5 INSTRUMENT INFO a e coe gS et eai deg eiie dn 5 6 SERVICE UTILITIES MENU Cic FETA RS TERRA HIR UA Hg daa V FARE 5 6 MORE SVC UTILITIES MENU 0 cece ccc cee cece nett hn es hr nnn 5 7 MEAS CAL OPTIONS MENU 0 ence ete n ehh enn 5 7 VIEW ARRAY MASTER MENU VIEW ARRAY INTERPOL MENU eeeseeeee eee ner eee enn 5 8 UPDATE CORR CONST MENU secs ce ccc eee hehe heat nnn 5 8 ANALOG BUS MENU ee s Ubi ur EVEN ae A MIA 5 9 ANALOG BUS NODES veda que cerise esses ade veis e derer ras ee Ee 5 9 MISCELLANEOUS SERVICE FUNCTIONS 2 0c ccc eee e eee eee 5 11 Clearing Nonvolatile Memory SRAM cc cece eect ete nee hne 5 11 Correction Constant
14. 1 Set power to 10 dBm for 1 3 GHz measurement 2 With an HP 8481D power sensor Figure 2 18 Power Range and Flatness Worst Case Values FOR 502 OPTION uma p poo AREER 948m LLL ee ee ee Ze 20 dBm Performance Tests 2 51 Figure 2 19 Broadband Frequency Response FOR 500 OPTION Frequency Frequency a b d MHz Marker Power Meter Marker Power Meter gt Ba b c d Value Reading Value Reading j 2 52 Performance Tests CALCULATION WORKSHEET FOR 759 STANDARD INSTRUMENTS Figure 2 16 Dynamic Range Compression Test Narrowband a b 5 Attenuation Value dB Input Level 7 dBm Frequen enuation Valu UM 9 Measured Value dB ERES Figure 2 17 Power Range and Flatness Test FOR 750 STANDARD Nominal Measured Power at CW Frequencies Power 1 Set power to 10 dBm for 1 3 GHz measurement Figure 2 18 Power Range and Flatness Worst Case Values FOR 750 STANDARD Performance Tests 2 53 Figure 2 19 Broadband Frequency Response FOR 752 STANDARD Frequency ELT Frequency NE C MHz Marker Paws Meter Marker TS Meter Du c d Value Reading Value Reading 2 54 Performance Tests CALCULATION WORKSHEET FOR 750 OPTION 1E1 INSTRUMENTS Figure 2 16 Dynamic Range Compression Test Narrowband b c Input Level 7 dBm a Attenuation Value dB Co lon 20 mpressio gt 0 Meas
15. Centronics If this is incorrect enter the correct information Refer to the HP 8711 Operating and Programming manual for more details on hardcopy options If everything seems okay but you still can t print or plot remove the CPU board and check jumper J45 near the HP IB and parallel connectors at the rear of the board Make sure the jumper is in the RUN position instead of TEST Try to make a print or plot from another instrument or a computer to confirm that the printer plotter is working If it is replace the CPU board HP IB Systems If an HP IB interface problem is indicated during power up with nothing connected to the HP IB port there may be a problem with the HP IB controller chip U9 or the interface chips U10 U34 Replace the CPU board or refer to the HP 8711A Schematic Package available separately to troubleshoot further Check the analyzer s functions with a known working peripheral such as a plotter printer or disk drive Press E to allow the analyzer to control the peripheral Check the HP IB address on the perip yzer to recognize this address by doing the following 2 HP IB Problems with Printers Plotters For HP IB printers or plotters press and select the appropriate HP IB device The currently selected device is shown on m first line ofthe display and for HP IB devices the HP IB address is shown on the second line To change the address press and enter t
16. Digital Group Problems 4 7 Disk Drives 4 3 Front Panel Problems 4 13 HP IB Systems 4 3 Incorrect Data Problems 4 16 Peripheral Problems 4 2 Phase Lock Problems 4 13 Power Supply Problems 4 5 Random Noise Trace 4 16 Receiver Problems 4 15 RS 232 Printers and Plotters 4 2 Source Group Problems 4 13 Source Power Problems 4 14 Spurious Signals 4 14 Spurs 4 16 the Analyzer 4 5 with Self Tests 4 9 Troubleshooting the 8711 System 4 1 U Update Corr Const Menu 5 8 Upgrade Kits ID 7 16 HP 8711A Verifying Instrument Performance 2 1 Verifying Performance with Automated Tests 2 22 Verifying Performance with Manual Tests 2 9 View Array Interpol 5 8 View Array Master 5 8 View Array Menu 5 8 HP 8711A Index iii
17. N reference ckt bd assy new 08711 60003 Frac N reference ckt bd assy R E 08711 69003 J6 external reference input jack BNC 1250 1842 Hex nut for BNC jack not shown 2950 0054 Washer for BNC jack not shown 2190 0068 10 mm machine screw 0515 0374 35 mm machine screw 0515 1038 J2 to J15 8 5 in cable 8120 2587 J4 to J8 8 5 in cable 8120 2587 J7 to J17 8 5 in cable 8120 2587 J18 to J18 SH 12 in cable 8120 2586 Shield frac N top 08711 20020 Shield frac N bottom 08711 20021 Shield frac N VCO top 03325 40602 Shield frac N VCO spacer plate 03325 40601 Frac N output SMB 1250 1512 10 MHz reference output SMB 1250 1512 Commercially available Note Item 1 consists of two circuit boards Do not take them apart They must be ordered together g with the above part number a o Figure 7 3 A3 Frac N Reference Assembly Replaceable Parts 7 6 Replaceable Parts How to Remove the Frac N Reference Assembly Disconnect the power cord Ext Ref Input Remove the front panel details are in Figure 7 1B on page 7 3 Disconnect if present the cable from the external refer ence input on the rear panel Remove the nut and washer from the BNC connector Disconnect the two cables from the front of the assembly Withdraw the assembly from its cavity Replaceable Parts 7 7 A4 SOURCE ASSEMBLY A4 source assembly new source assemb
18. Press or a Move the arrow pointer to the next calibration factor entry and repeat the action in the paragraph above for the remaining calibration factors Press when you finish entering all the calibration factors to store the calibration factor data to disk Enter the last five digits of the power sensor serial number and press If you DO NOT want the data stored to disk press Press any key to continue to the attenuation calibration factors menu Move the arrow pointer to the device you will use to input the attenuation calibration factors and press Read disk can only be selected if you are using an attenuator for which you ve already saved a calibration factor table If youselected Read Disk another menu appearsthat allows you to choose the serial number of an attenua tor that has an available calibration table Move the arrow pointer to your choice and pres The program returns you to the attenuator calibration factors menu Performance Tests 2 37 ed Keyboard Entry Edit a list of attenuation values are displayed on the controller screen and enter the calibration factor for the attenuation value at the top of the list The calibration en from the calibration certificate data Press Move the arrow pointer to the next calibration factor entry and repeat the action in the paragraph above for the remaining calibration factors b Press store the calibration factor data
19. Storing and Recalling Correction Constants to make a copy of the correction constants so you can quickly restore the adjustment data if you replace the CPU board or update firmware Adjustments 3 1 When you are performing the adjustment procedures you should store the correction constants to a disk file periodically This allows you to restore data quickly in case you need to switch off the analyzer power before completing the adjustments 3 2 Adjustments FRACTIONAL N VCO ADJUSTMENT This procedure shows you how to adjust the frequency of the fractional N VCO on the A3 frac N reference assembly Caution Place the analyzer on an anti static mat and wear a connecting wrist strap when making this adjustment Recommended Model or Part Number NENNEN 50 ohm std 75 ohm opt 1EC Service extender board part of service kit part of service kit 08711 60010 08711 60010 Digial volmeter any 1 Switch off the instrument power Remove the front panel by following these steps and referring to Figure 3 1 a Remove the trim strip from the handles b Remove the four 10 torx screws attaching each handle to the instrument c Pull the analyzer toward you to extend about two inches over the table top d Grasp and pull the front panel with two hands one on the top middle of the panel and the other on the bottom middle of the panel Disconnect the front panel ribbon cable e Remove the two 15 torx screws attach
20. Typical Bandpass Filter Measurement Plots To check analyzer operation in reflection mode 6 Press to put the analyzer in a mode to measure the reflection of a filter 7 Press eE Compare the displayed measurement to the plot shown in Figure 2 3b to measure the filter If the Analyzer Fails the Test Refer to the Troubleshooting chapter in this manual 2 8 Performance Tests VERIFYING PERFORMANCE WITH MANUAL TESTS This section contains procedures that show you how to check the performance of the HP 8711 using the follow ing manual tests frequency range and accuracy e dynamic range e power range and flatness Performance Test Worksheet and Record A calculation worksheet and performance test record are provided for you to calculate test results and record values The worksheet and test record are located at the end of this chapter Performance Tests 2 9 2 1 FREQUENCY RANGE AND ACCURACY PERFORMANCE TEST Use this procedure to test the analyzer s frequency accuracy over its entire frequency range The specifications the instrument performance is tested against are listed below Frequency range specification 300 kHz to 1300 MHz frequency accuracy Frequency accuracy specification lt 5 ppm 25 C 5 C To set up the equipment The list below shows the equipment you use in this test You can use any equipment that meets the critical speci fications listed in the table of service test e
21. nector or receiver assembly Clean all the connectors and repeat the test Using a different calibration kit perform the Reflection Correction Adjustment procedure in the Adjust ments chapter If you use the same calibration devices to do both the adjustment and this test you will only be making a repeatability measurement Performance Tests 2 47 CALCULATION WORKSHEET FOR 50 STANDARD INSTRUMENTS Figure 2 16 Dynamic Range Compression Test Narrowband Input Leve 10 dBm Measured Value dB compresa n Figure 2 17 Power Range and Flatness Test FOR 502 STANDARD 1 Set power to 13 dBm for 1 3 GHz measurement Figure 2 18 Power Range and Flatness Worst Case Values FOR 502 STANDARD Eee 6dim J WELL OMM eee eee oe a oe tee dee Performance Tests 2 49 Figure 2 19 Broadband Frequency Response FOR 502 STANDARD Frequency omm omm DERE Preduency a b c d MHz Marker Power Meter Marker Power Meter og c d Value Reading Value Reading an eee 2 50 Performance Tests CALCULATION WORKSHEET FOR 509 OPTION 1E1 INSTRUMENTS Figure 2 16 Dynamic Range Compression Test Narrowband b c Input Level 10 dBm Measured Value dB di gt 0 Figure 2 17 Power Range and Flatness Test FOR 500 OPTION
22. of an external source This external source signal is then measured by the B input The measured value is the average of all the points in the trace The typical power accuracy for 10 to 1300 MHz is graphed below Maximum Error dB Power dBm To set up the equipment Thelistbelow shows the equipment used in this test You can use any equipment that meets the critical specifica tions listed in the table of service test equipment in chapter 1 However the procedure is based on the recom mended model or part number Warm up time is 1 hour Performance Tests 2 41 Recommended Model or HP Part Number 50 Ohm std 75 Ohm opt 1EC 9000 series 200 300 9000 series 200 300 08711 10009 08711 10009 8116A 8116A HOA 118500 437 438 S483A 11708A p o 8481 8496A G opt 001 H17 8496A G opt 001 H17 713A 10833A 1250 1475 1250 1528 1250 0077 1250 0077 1250 1472 9122C D 9122C D Equipment HP BASIC controller with BASIC 5 0 or higher Test software Signal generator Power divider 75 ohm power splitter Power meter Power sensor 5 High sensitivity power sensor 50 MEZ reference attenuator Minimum loss pad 30 MHz bandpass filter 75 ohm termination Step Attenuator 100 dB Attenuator switch driver optional IB cables 3 or 4 Type N cables 2 Adapter type N m type N m BNC m to N f type N f type N f Disk drive ThinkJet
23. to normalize the trace on channel 2 then put channel 2 into hold mode 4 Removethe cable Connect a termination load to the REFLECTION port and a short to the TRANSMIS SION port 5 Press GaN SORE the sweep to finish then press 6 Press to 5 MHz in the test record 7 Repeatsteps 5 and 6 for channel 2 recording the results for 5 MHz to 1 3 GHz in the performance test record Note to see the entire trace of channel two press Sca when the four sweeps are completed 8 Reconnect the through cable between the two ports of the analyzer again Repeat until four sweeps are completed to find the peak noise value Write the marker value for 300 kHz 9 Press This sets up channel 1 to measure B with a narrow system bandwidth 10 Press EAL to turn off automatic detector zeroing and normalize the 11 Remove the cable Connect a termination to the REFLECTION port and a short to the TRANSMISSION port 12 Press to take and average 64 sweeps then press MENU Wait for 30 seconds for the analyzer 2 14 Performance Tests find the peak noise value Write the marker value on the test re 13 Press WARER cord If the Analyzer Fails the Test If the analyzer fails the test suspect the receiver assembly Refer to the Switched Gain Correction and B Amplitude Correction procedures in the Adjustments chapter If the analyzer still fails the test re
24. typical value is 30 degrees Celsius when a detector is con nected If no detector is connected the typical value is around 0 Y Det Temperature degrees Celsius Y detector temperature ITEMPY on the receiver schematic A typical value is 30 degrees Celsius when a detector is con nected If no detector is connected the typical value is around 0 degrees Celsius Offset used for the B chopper on the receiver board BOFFSET on the schematic The voltage varies depending on the value of the B DAC which can be changed using the more service uti lities menu Typical values are 12 to 12 volts Offset used for the R chopper on the receiver board ROFFSET on the schematic The voltage varies depending on the value of the R DAC which can be changed using the more service uti lities menu Typical values are 12 to 12 volts p B Detector Temp Temperature of B internal detector on the receiver board BTEMP on the schematic Typical values are 20 to 60 degrees Celsius this will depend on the ambient temperature EE 5 on CPU 5V power supply on the CPU board Normal values 4 5 to 5 5 volts 12V Flash Voltage 12V Vpp supply for writing to the flash EPROM on the CPU board This voltage is normally OFF so the ABUS value should be less than 2 5V The on voltage level is checked dur ing the power up tests and an error message is displayed if the level is incorrect Temperature se
25. CISPR 11 class EN50082 1 2 1991 EC 801 2 1991 4kV CD 8kV AD JEC 801 3 1984 3V m 26 500 MHz IEC 801 4 1988 500V Santa Rosa 6 8 92 y Location Date Dixon Browder Quality Manager HP 8711A RF NETWORK ANALYZER CONTENTS OVERVIEW AND PREVENTIVE MAINTENANCE Line Fuse Replacement 0 cece cece eee creer n ehh SERVICE TEST EQUIPMENT ccc cece cece cece cence e n n nnn nn PERFORMANCE TESTS VERIFYING INSTRUMENT PERFORMANCE 0 2 0 cece cece enne When to Perform the Operator s Check 0 0 0 0 cece ence cece III When to Perform the Manual Performance When to Perform the Automated Performance Tests 0 cece cece cee e ete eeneeee Performance Test Notes 2 22 2 2 eee ee ee ee nee ee eet 9I If the Analyzer Fails a Test 0 0 0 c ce ccc cece ence cnet e eee ter nnn Recommended Test Equipment 06 cece cen nn nnn Analyzer Calibration Cycle 0 0 0 ccc cece cect c cece eee ence erence HP 8711A SYSTEM SPECIFICATIONS 0 cece eee ee eter cece ee he n OPERATOR S CHECK isco UVP eye eR MSE ENT To check analyzer operation in transmission mode To check analyzer operation in reflection mode 0c eee eee cent cence eee If the Analyzer Fails the Test 0 0 0 ccc ccc cece cece tnl VERIFYING PERFORMANCE WITH MA
26. CONFIGURATION MENU This menu contains three columns two of which are visible on the screen Use the cursor control keys left right up down to select different parts of this menu DO NOT EDIT COLUMN 1 2 28 Performance Tests 2 Ifnecessary change the printer or power meter model number IF you are using and HP 436A power meter type HP436A with no spaces The other four device models listed must remain unchanged for the tests to run Press to view column three This selection allows you to input the actual HP IB hardware addresses of the equipment you will use in the performance tests Each instrument address is assumed to be the recommended default address for the instrument with an HP IB select code of 7 If necessary change the address on the instrument s to match the factory selected defaults However if this is not possible use this menu to edit the program s addresses to match your equipment When you exit this menu the changes you make are stored to file DEV CONFG and are in effect the next time you run the program The file DEV_CONFG lists the instruments required for all the tests 5 Press to return to the HP 8711 performance test main menu To Run the Performance Tests Program 1 With the arrow at PERFORMANCE amp ADJUSTMENT TESTS press Enter or RETURN enter the performance test menu The program checks the analyzer s serial number and the serial number of the TEST DATA file if it exist
27. EXAMPLE Your system includes HP 9133H disk drive at HP IB address 700 floppy drive is unit 1 hard disk is unit 0 The hard disk can be configured as one large volume or several To copy a file from the master program disk in the floppy drive to volume 3 of the hard disk the copy com mand syntax would be COPY PERFTEST 700 1 TO PERFTEST 700 0 3 To Copy from Flexible Disk to Flexible Disk 1 Insert the master disk into one drive and the initialized working disk into the other drive 2 Type COPY sourcemsus TO destinationmsus where sourcemsus is the msus of the drive containing the disk you want to copy and destinationmsus is the msus of the drive containing the initialized working disk EXAMPLE Your system includes HP 9122D dual disk drive at address 700 master program disk in the left drive working disk in the right drive The copy command syntax would be COPY 700 0 TO 700 1 2 26 Performance Tests LOADING AND RUNNING THE TEST SOFTWARE The following procedures show you how to load the performance test software and interact with the program You must have the system connected via HP IB with the corresponding addresses To Load the Test Software 1 Set the msus mass storage unit specifier to the address of the drive containing the working copy of the program disk by typing MSI XXX X then press For example Your system mass storage is an HP 91
28. Flatness 2 16 Printing Test Results 2 30 Recommended Test Equipment 2 2 Running Automated Tests 2 29 Spurious Signals 2 31 System Directivity and Port Match 2 45 Port Match and System Directivity Performance Test 2 45 Power Source Correction Adjustment 3 18 Power Accuracy Performance Test 2 41 Power Holes 2 18 Power Range 2 17 Power Range and Flatness Performance Test 2 16 Index ii Power Supply 7 11 How to Remove 7 11 Parts ID 7 11 Theory of Operation 6 2 Preventive Maintenance 1 2 Printer 2 22 Printers Compatible 2 23 Printing Performance Test Results 2 30 Program Disk 2 27 R R Correction Adjustment 3 2 R Chan DAC 5 7 R Freq Response 5 8 R Frequency Response Correction Adjustment 3 25 Rebuilt Parts 7 1 Rebuilt Exchange Assemblies 7 1 Receiver Assembly 7 9 How to Remove 7 10 Parts iD 7 9 Theory of Operation 6 6 Receiver Characteristics 2 4 Recession of Center Conductor 1 2 Recommended Test Equipment 2 2 Recover from an Error 2 29 Reflection Correction Adjustment 3 23 Restore Data Disp 5 8 RF Connectors How to Check 1 2 RF Output Power 2 4 Run the Performance Tests Program 2 29 Running Software 2 27 S Sample 5 9 SCPI Command Summary 5 15 SCPI Commands 5 14 SCPI Syntax 5 14 Select Adjustment 5 2 Select Node 5 9 Select Self Test 5 2 Self Tests 5 2 Self Tests for Troubleshoo
29. Printer gt 2 42 Performance Tests Controller Disk Drive Thinkjet Printer D en HP 8711A Function Network Analyzer Switch Driver Generator Power Meter Adapter Type N f to Type N f a For 50 Q Systems Controller Thinkjet Printer a Function Switch Driver Generator optional Power Meter ee HP 8711A Network Analyzer Adapter BNC m to N f 500 Type N Cables Minimum Fad b For 75 Q Systems Sensor Only Figure 2 13 Setup for Absolute Power Accuracy Performance Tests 2 43 1 Connectthe equipment in one of the configurations shown in Figure 2 13 depending on the impedance of the HP 8711 that you are testing Do not connect the power sensor to the power divider or splitter yet since the power meter will be calibrated during the procedure 2 If you haven t already done so load the test software by following the procedure in Loading and Running the Test Software located earlier in this chapter 3 Select Absolute Power Accuracy from the performance tests main menu 4 The program will ask for the cal factors at 30 MHz for each power sensor Notice that these are NOT the reference cal factors for the sensors which are at 5 0 MHz You will be asked for these values later 5 Follow the program s instructions to complete the test If the Analyzer Fails the Test Since the absolute power accuracy
30. Remove the four screws along the rear edge of the display enclosure Lift open the CRT access panel and disconnect the two wire cable from the power supply Withdraw the power supply from the housing Replaceable Parts 7 11 A7 DISPLAY ASSEMBLY 000000000000 8959898280999 9808 50 96 9 o 9 090 060 0800595 0908550009 E 9095590 Display assembly CRT PC bd assembly display enclosure new CRT assembly CRT and PC bd assy Display enclosure Fuse for replacement part of item 1 Display enclosure cover for replacement part of item 1 Line switch intensity adjustment intensity knob Commercially available Figure 7 7 Display Assembly Replaceable Parts 7 12 Replaceable Parts How to Remove the Display Assembly Disconnect the power cord Remove the two screws from the rear panel Remove the two screws from the bottom cover of the instrument Remove the front panel details are in Figure 7 1B on page 7 3 Withdraw the enclosure 2 or 3 inches from its cavity Disconnect the ribbon cable from the jack behind the top of the CRT item B Figure 7 7 on page 7 12 Withdraw the enclosure completely from its cavity NOTE The rear panel end of the enclosure is heavy Don t let it slip as it comes out Note The CRT itself and its PC bd assembly are a matched pair and must be replaced together y To replace the power switch or brightness control remove the disp
31. SUPPLY PS PROBLEMS Check the Rear Panel LEDs Turn the instrument power on Check the condition of the two LEDs visible through the hole in the rear panel to the right of the AC power plug Green LED on amp red LED off normal condition Continue with Measure Power Supply Voltages to con firm that the power supplies are okay Neither LED on check the line fuse located in a holder above the AC power jack and replace it with the spare provided if necessary Check the AC power line If there are still no LEDs on replace the power supply Green LED red LED on steadily fan off check the line voltage selector switch located below the AC power jack If it is correct remove the PS display assembly and make sure that the cable from the on standby switch to the power supply assembly is connected see Figure 7 7 Troubleshooting 4 5 With the PS display assembly outside the analyzer plug it in and turn on the power Fan still off check the 4 green PS LEDs visible from the right side of the display enclosure as viewed from the front If the LEDs are on the fan is probably broken Replace the PS assembly Green LED on red LED on steadily fanon goto Measure Power Supply Voltages Note that it is normal for both the green and red LEDs to be on when the power switch is in STANDBY but not when the switch is ON Green LED on red LED blinking the powersupply is in shutdown Remove the PS display from analyzer pl
32. Similarly the Receiver LO output is generated by the RF2 signal mixing with the sweeping Source LO resulting in a signal that is offset from the Source RF output by the receiver IF 6 4 Theory of Operation 29629 Figure 6 2 Simplified Source Block Diagram Power level control of the source RF output is achieved by using a coupler detector on the source RF output signal which controls a modulator on the RF1 signal Digital correction is applied to the RF2 signal to control the receiver LO power level Both power levels can be adjusted by running the appropriate service tests See the Adjustments section of this manual for more details The source also has a dither mode for spur avoidance When dither is on the RF1 frequency changes from 2340 MHz to 2304 MEZ and the RF2 frequency changes to 2304 MHz IF to maintain the 27 778 kHz offset between these two signals Because of these changes the mixing products from the two source mixers will be at different frequencies resulting in spurs that have shifted in frequency when compared to the dither off state This is used in two ways The user can select under the Source key which causes the analyzer to shift the RF1 and RF2 frequencies to the dither on values for all subsequent sweeps until dither is turned off again This is useful if the user is only interested in narrow frequency span and switching dither on success fully moves a spur out of the span of
33. and firmware revision Boot ROM version Instrument serial number Installed options System impedance Installed memory DRAM SERVICE UTILITIES MENU This menu allows manual control of several sections of the source and receiver boards This can be a helpful tool in troubleshooting these circuits 5 6 Service Key Menus Allows the user to have manual control over the IF gain amplifiers in the receiver Overrides the settings of the other IF gain keys This is helpful for troubleshooting problems with the receiver board s IF gain amplifiers In AUTO mode the instrument autoranges the IF amplifiers to achieve optimal signal noise at ADC In manual mode the user sets the gain stages on or off using the following keys Only active when has enabled manual control The low IF gain does not have gain The circuit has a step attenuator which is normally on and it is switched off when gain is needed This key allows the user to turn tbe low IF gain on or off by switching the attenuation off or on respectively Only active when has enabled manual control Allows user to turn the high IF gain amplifier circuit on or off When IF gain is being controlled automatically the high IF gain is not used for narrowband measurements Note The receiver can be compressed if high powers are applied with the switched gain set to on Theswitched gain cal removes offsets between the different gain states so the trace level should not be
34. and yet receive enough power to turn on the LEDs If the LEDs are on remove the CPU board remove rear panel screws first Remove the sh eld from the 68020 CPU in the center of the CPU board and make sure it is properly seated in its socket Then reinstall the CPU board making sure to push it all the way in so that it connects properly with the backplane If there is still no beep at turn on and CPU LED continues to display an 8 replace the CPU 056 or the entire CPU board Disk drive light does go on make sure the power 3 wire cable and ribbon cable are connected from the disk drive to the CPU board Check the cables The problem can be either a bad disk drive or bad drive circuit ry on the CPU If an error message appears during power up about a floppy disk controller error replace the CPU Otherwise replace the disk drive NoCRT display adjust the front panel intensity knob clockwise to increase the brightness Remove the dis play and check the ribbon cable connection to the CPU board If the problem persists check the output from the Video Out BNC on the rear panel with an oscilloscope Check for activity in this signal The frequency and magnitude may vary Video Out signal bad the video circuitry is probably bad Replace the CPU or go to the Detailed Trou bleshooting section to confirm the problem Video Out signal good tbe problem is most likely either the display assembly or the ribbon cable
35. cece cee cee ee ehh tn 6 4 A4 SOUIC arresa Ve a X RARE AA e meae e e NUS S n A Us TRATEN ers 6 4 RECEIVER THEORY dss Sisal gale ee dis gums rale tes Wie wines hie Viele d La Ree aa 6 6 REPLACEABLE PARTS INTRODUCTION ducite nis dae eR eee ee get merge e i vida ag 7 1 TOOLS REQUIRED rry ole di bere ne D RE owiehe IS 7 1 HOW TO ORDER PARTS deuina ern rr ERE eer male ele i e ee 7 1 Save Money by Ordering R E Rebuilt Exchange Assemblies 7 1 Save Time by Calling 800 227 8164 2 2 00 eee 7 2 MAJOR ASSEMBLIES Rain s erp sities eat ele drei ob ave b s 7 2 iv Contents HP 8711A 1 FRONT PANEL ASSEMBLY 2 0 cece cece II How to Remove the Front Panel Assembly n A2 CPU ASSEMBLY How to Remove the CPU 5 Inn FRAC N REFERENCE ASSEMBLY 0 cece cece cece nnn How to Remove the Frac N Reference Assembly eese A4 SOURCE ASSEMBLY How to Remove the Source Assembly e cent ence een e een ee eees AS RECEIVER ASSEMBLY Rewer
36. data disk BASIC and the required binaries must be loaded and running to initialize a disk See To Load the Operating System and Binaries 1 Inserta write enabled blank disk into the disk drive In the write enabled state the sliding tab covers the hole Then type INITIALIZE msus Where msus mass storage unit specifier is the address of the drive containing the disk to be initialized The initialization process takes approximately 60 seconds for each disk Performance Tests 2 25 To Copy to a Hard Disk or High Density Flexible Disk To copy the master performance disk to a storage medium of a larger size you will have to perform a file by file copy instead of copying the entire volume at once To perform a file copy follow the instructions below After typing each command from the keyboard press Or to execute the command 1 Insert the master program disk into the drive and look at a directory listing by typing msus Where msus is the msus of the drive containing the master program disk 2 Ifyouare copying to a flexible disk insert the initialized working disk into the second drive Type COPY filename master msus TO filename destination msus Where master msus is the msus of the disk drive containing the master performance disk and destination msus is the msus of the flexible or hard disk drive containing the working storage media 3 Perform step 2 for each file on the master program disk
37. dedicated processors on the CPU assembly When the analyzer is the system controller in an HP IB system it also controls peripheral devices through the HP IB interface The TMS 320C25 digital signal processor DSP receives the digital data from the 5 receiver board and per forms data processing functions such as digital filtering averaging and applying error correction It has some dedicated SRAM for running its firmware and it also uses some shared DRAM and SRAM which is used to transfer data with the CPU The TMS 34010 graphics system processor GSP is responsible for converting data from the CPU into video signals to drive the A7 display assembly It also produces an external video output which is accessible from the rear panel A number of processors on the CPU assembly allow the analyzer to interface with the outside world The front panel processor handles inputs from the front panel keyboard and RPG The floppy disk controller controls the internal floppy disk drive The DIN keyboard interface allows a user to connect an external keyboard which is very useful when writing programs with IBASIC The Centronics and RS 232 interfaces allow the analyzer to control printers and plotters with a parallel or serial interface The HP IB interface allows the HP 8711 to be a system controller or talker listener on an HP IB bus In addition there are two TTL outputs user bit and limit test pass fail bit that can be accessed by the user There is a
38. deteriorates significantly you may wish to repeat the adjustment 11 If you do not need to repeat the API and 100 kHz spurs adjustment remove the extender board and reas semble the instrument 3 8 Adjustments FREQUENCY ACCURACY ADJUSTMENT In this procedure you adjust the frequency accuracy of the analyzer s source by adjusting the 10 MHz internal reference clock Recommended Model or Part Number m type NG 10 ENG 1250 0789 1 Connect the equipment as shown in Figure 3 6 HP 8711A Notwork Analyzer Frequency Counter BNC Input For 75 2 Analyzers only Minimum Loss Pad BNC Cable Figure 3 6 Setup for Frequency Accuracy Adjustment 2 Set the frequency counter input switches to the 10 Hz 500 MHz and 50 ohm positions 3 On the analyzer press If the frequency counter reading is 500 MHz 2500 Hz you do not need to make this adjustment However you can still make this adjustment to im prove the frequency accuracy 4 proceed with the adjustment disconnect the frequency counter and adapter s from the RF OUT connector Adjustments 3 9 5 Remove the handles and front panel by following these steps and referring to Figure 3 7 a Remove the trim strip from the handles b Remove the screws attaching each handle to the instrument C Pull the analyzer toward you to extend about two inches over the table top d Grasp and pull the front panel with two hands one on the to
39. external reference has not been selected by pressing the key and making sure that is displayed Replace the frac N reference board or refer to Detailed Trouble shooting to continue Verify Frac N Output setthe analyzer to the CW frequencies in the table below and check the fractional N output at A3J1 connector on the left Source Frequency Frac N Frequency 300 kHz 36 567 MBz 100 MHz 38 125 MBz 500 MHz 44 375 MHz 1 3 GHz 56 875 MHz e Frac N output OK replace source board Frac N output not OK press ww and make sure dither is OFF since the frequencies will be different for dither ON Remove the frac N reference assembly and check all cables Perform the Fraction al N VCO Adjustment see the Adjustments section of this manual If problem persists replace the frac N reference assembly Source Power Problems Perform the LO Power Correction and Source Power Correction procedures in the Adjustments section of this manual Measure the RF output signal directly out of the source board at A4J4 to verify problems above 0 dBm Note that if the analyzer has a step attenuator the power output from A4J4 will be offset since the ad justments were done with the attenuator in the signal path If the output is correct when measured directly from A4J4 go to Receiver troubleshooting Otherwise replace the source assembly Spurious Signals Perform the Spurious Signals test procedure in the
40. includes a monochrome 20 8 cm 9 inch CRT and a matching driver board Video signals are produced by the A2 CPU assembly and sent to the A7 assembly for display on the CRT An intensity adjustment is accessible from the front panel A8 Floppy Disk Drive The A8 floppy disk drive is referred to by the analyzer as the internal disk It accepts double density or high density 3 5 inch floppy disks It can read from or write to either LIF or DOS format disks The Save Recall menus of the HP 8711 can only format disks in DOS format However you can use an external controller or IBASIC option 1C2 to format disks in LIF format if desired SOURCE THEORY The source group consists of the fractional N reference assembly and the A4 source assembly A3 Fractional N Reference The A3 assembly consists of two boards connected together The reference board generates the various reference signals used in the analyzer while the fractional N frac N board generates a 30 to 60 MHz synthesized signal for use in the A4 source assembly The reference board uses either the internal 10 MHz crystal oscillator or an external 10 MHz reference signal to generate three reference signals The 100 kHz signal is used in the fractional N VCO phase lock loop The 10 MHz signal is used by the A4 source assembly A 5 MHz signal goes to the backplane where it is routed to the AZ CPU and AS receiver assemblies for use in signal processing The fractional N board is the s
41. output power is subtracted from the change in B input level for each frequency to determine the frequency response Broadband frequency response typical characteristic 0 5 dB opt 1 Minimumiospod THE 15 olm terminan 1 Zero and calibrate the power meter Set the cal factor to the correct value for 30 MHz 2 Connect the equipment as shown in the figure below HP 8711A HP 8711A Opt 1EC Network Analyzer Network Analyzer Minimum Loss Pad 50 ohm Cable 75 ohm Cable Cable P Power Powor Spite a 50 Q HP 8711 b 75 8711 Figure 2 6 Setup for Broadband Frequency Response Test 2 20 Performance Tests 10 11 12 On the analyzer press to make a B measurement at 30 MHz Press Power 50 ohm analyzer press Enter Adjust the power level with the front panel knob for a power meter reading of 0 dBm 0 2 dB 75 ohm analyzer press 7 ENTER Adjust the power level with the front panel knob for a power meter reading of 6 5 dBm 0 2 dB Press the button on the power meter on an HP 436A to make future power measurements relative to this level On the analyzer press car On the analyzer press Record the marker value in column a of Figure 2 19 on the calculation worksheet Enter the correct cal factor on the power meter for this frequency Record the power met
42. panel ribbon cable e Remove the two 15 torx screws attaching the handle plate on the right side Adjustments 3 5 Frac N board Front panel assembly ribbon cable Handle plate screws on each handle Trim strip screws and handles on each handle Figure 3 3 Removing the Handles and Front Panel 3 To setup the service extender board for adjusting the frac N board follow these steps a Remove the backplane cover from the rear panel of the analyzer by lifting up on the tab and sliding the cover toward the power cord receptacle b Attach the service extender board by reversing step a with the lower extender board c Place an antistatic mat on top of the analyzer d Remove the two SMB cables from the frac N reference assembly Remove the nut on the rear panel EXT REF BNC connector Use the handle to pull the board assembly out of the analyzer Attach the frac N reference assembly back plane connector to the upper extender board f Reconnect the SMB cables 4 Connect the equipment as shown in Figure 3 4 3 6 Adjustments Controller Thinkjet Printer p i5 Address 701 Spectrum Analyzer Disk Drive CQODUD ooooo oo 0000 co rc2D000 LL 9 Ou HP IB Address 700 Fo Eee HP 8711A Network Analyzer eL HP IB Address 716 tle Min Loss Pad for 759 8711 Figure 3 4 Setup f
43. read lt num gt right shift lt num gt Source board Failed self test Receiver board Failed self test Test reads version numbers from frac N ref source and receiver boards Checks for 5 MHz clock from frac N reference board Make sure all boards are pushed in and making good contact with backplane Check 10 MHz output from A3J3 If not found see Troubleshooting Source Group Problems Replace CPU or check U21 U22 Errors SRAM battery test FAILED Saved states lost SRAM battery test ERROR Cannot access SRAM Tests integrity of battery backed SRAM detects loss of power to SRAM Writes reads pattern to part of SRAM Remove CPU board and check battery BT1 replace if needed Re place CPU board or check U124 controller U83 SRAM and U125 voltage regulator Digital IF Control Test not implemented CPU Support Circuitry Errors 68901 MFP chip test FAILED Stuck interrupt Tests 68901 Multi Function Peripheral chip and interrupt circuitry Replace CPU board or check U133 Errors CPU 45V supply is out of range Vpp Flash Supply is out of range Tests analog bus ADC on CPU board Replace CPU or check power supplies U109 voltage regulator for Vpp 17 Real Time Clock Test not implemented 18 Front Panel Interface Error Front panel keyboard FAILED Command write timeout Read input timeout Clear input buffer failed Echo byte test failed 16 Analog Bus
44. splitter If the analyzer displays an error message and aborts the adjustment the calibration data from test 103 is probably bad 10 Follow the prompts to complete the adjustment 3 28 Adjustments Storing and Recalling Correction Constants Note To update firmware or correction constants you must erase both first Therefore you MUST have a firmware disk available to update correction constants because you cannot make a firmware disk yourself The figure below illustrates the flow of CCs in the analyzer Lood CC from Disk Store CC 5 to Disk Disk Permanent Slow RAM Not Permanent In Use Install CC from Disk Power Up Power Down EPROM SRAM Permanent Semi Permanent Erase Small 59650 Figure 3 12 Correction Constants Flow by Keystroke and Cycling Power To Permanently Store CCs in the Analyzer Typically you have just completed the last service adjustment The CCs are now in RAM volatile memory To permanently store all of the CCs in EPROM non volatile perform and check step 1 below Storing Correction Constants to Disk step 2 below Updating or Restoring Firmware step 3 below Installing Correction Constants To Temporarily Store CCs to Disk for Later Recall Perform the following step step 1 below Storing Correction Constants to Disk To Recall CCs from Disk Perform the following step step 4 below Loading Correct
45. the frac N reference assembly 4 12 Troubleshooting Other Power Up Problems The power up sequence can also go wrong if there is problem with the SRAM These problems can have many symptoms since the symptom will depend on where the instrument was in its power up sequence when the bad data was encountered Try clearing the SRAM see previous section for instructions If the problem persists the DRAM is probably bad and the CPU board needs to be replaced Front Panel Problems If the front panel keyboard is not responding properly remove the front panel and make sure the ribbon cable is properly connected between the FP and the CPU Inspect the keypad and the PC board Replace it if it s defective The RPG can be replaced separately If everything else is okay replace the CPU board TROUBLESHOOTING SOURCE GROUP PROBLEMS This group includes the fractional N reference and source boards Main problems likely to be these Phase lock lost e Power output problems e Source spurs Output power check connect a power meter oscilloscope or spectrum analyzer to the reflection port Set analyzer to CW frequency of 300 kHz Change power level and see if output power changes correctly Repeat at a couple more frequencies e g 1 MHz and 50 MHz No source output or noisy 20 dB trace the source may be disconnected from the receiver Check the cable connections between the source and receiver torque to 8 in Ibs If the pr
46. the Device Configuration 2 cece eee ce 0 2 28 To Run the Performance Tests Program 0 cece eee e eee eect nen 2 29 To Recover from an III 2 29 PRINTING PERFORMANCE TEST RESULTS 0 000 c cece eee eee teen eee nnn 2 30 2 5 SPURIOUS SIGNALS AUTOMATED PERFORMANCE TEST 2 31 set up the equipment cece HH Hh 2 31 2 6 DYNAMIC ACCURACY AUTOMATED PERFORMANCE TEST 2 34 2 7 ABSOLUTE POWER ACCURACY AUTOMATED PERFORMANCE TEST 2 41 2 8 SYSTEM DIRECTIVITY AND PORT MATCH AUTOMATED PERFORMANCE TEST 2 45 ADJUSTMENTS ADJUSTMENT DESCRIPTION cece eee eee hh hh nnn 3 1 FIRMWARE ADJUSTMENTS 0c cece cece ce cece cece eee eee hh en 3 1 FRACTIONAL N VCO ADJUSTMENT 0 cece cece enhn n 3 3 FRACTIONAL N SPUR ADJUSTMENT 0 2 eee cece cect cece cence hh hn n 3 5 FREQUENCY ACCURACY ADJUSTMENT ce cece een Hm ene 3 9 SET SERIAL NUMBER ADJUSTMENT 00 cece cece eee ehh n em nnn 3 11 In Case OF Difficulty 2 ret rtr rer bia har Sele ese 3 12 LO POWER CORRECTION ADJUSTMENT 0 0 ee e He e hr nnn 3 13 SWITCHED GAIN CORRECTION ADJUSTMENT esee 3 14 EXTERNAL DETECTOR CORRECTION ADJUSTMENT cece nnne 3 16 AUX IN CORRECTION ADJUSTMENT 2 2 22 0 e eee I nn 3 17 SO
47. you already have an HP 8496A G calibration can be obtained from Hewlett Packard s Loveland Instrument Division Standards Laboratory Hewlett Packard Company Loveland Instrument Division Standards Laboratory 815 14th Street S W Loveland CO 80537 The specifications the instrument performance is tested against are listed below Dynamic accuracy specification is the receiver s accuracy versus input power level Accuracy linear 20 LOG 1 Accuracy dB 186 RF 16 2B 48 30 6B 70 80 Measurement Level dB from REF To set up the equipment The list below shows the equipment used in this test You can use any equipment that meets the critical specifica tions listed in the table of service test equipment in chapter 1 However the procedure is based on the recom mended model or part number Warm up time is 1 hour Note For 75 ohm systems minimum loss attenuators adapters and 75 ohm cables are required 2 34 Performance Tests some opt TO with BASIC 5 0 or higher Adapter ype N type N 8536 8014 Maimmlssps _____ H8288 O b ad 00709 60009 Performance Tests 2 35 Thinkjet Printer Controtier Disk Drive HP 8711A Network Analyzer everday Power Meter 0000 Step Attenuator Power Splitter a For 50 Ohm Systems Thinkjet Printer Controller Disk Drive
48. 0 volts A value higher than about 11 5V may indicate a saturated op amp Output of integrator in the source LO loop LO_INT on the schematic Voltage decreases as source frequency increases normal values are 2 0 to 10 0 volts VCO tuning voltage for the RF2 phase lock loop on the source board OFFSET TUNE on the schematic Value varies with the source frequency setting Normal values are 6 to 10 volts A value higher than about 11 5V may indicate a saturated op amp RF 1 Tune Bl ell 3 ud Output Amp Temp 2 5 Shows the temperature at the output amplifier on the source board OUTPUT AMP TEMP on the schematic Normal val ues are 30 to 45 degrees Celsius Service Key Menus 5 9 ALC log amp output on the source board ALC LOG on the schematic Value depends on the source power level Normal values are 1 75 to 0 5 volts Voltage to ALC PIN modulator on the source board This value increases as the source power increases Normal values range from 3 0 to 10 5 volts ELCHE NN ALC Log ALC PIN 5 on RCVR 45V power supply on the receiver board Normal values are 4 5 to 5 5 volts 15V on RCVR 15V power supply on the receiver board Normal values are 13 5 to 16 5 volts 15V on RCVR 15V power supply on the receiver board Normal values are 16 5 to 13 5 volts X Det Temperature X detector temperature ITEMPX on the receiver schematic
49. 00007 MHz 0 000011 MHz 0 000064 MHz 0 000127 MHz 0 000632 MHz 0 001260 MHz 0 001586 MHz 300 0015 kHz 1 000005 MHz 5 000025 MHz 10 000050 MHz 50 00025 MHz 100 0005 MHz 500 0025 MHz 1000 0050 MHz 1300 0065 MHz Dynamic Range Compression At 7 dBm Noise Floor Narrowband Mode 300 kHz to 5 MHz 5 MHz to 1 3 GHz Broadband Mode 10 MHz to 1 3 GHz 1 Usingthe equipment and procedures documented in this manual Assumes 20 dB attenuator used in compression test had data measured on an HP 8753 system with full 2 port calibration Performance Tests 2 65 75Q OPTION 1E1 Test Record 4 of 4 Serial Number Report Number Test Minimum Measured Maximum Measurement Test Description cpecilcaton specication Power Range and Flatness 0 5 dB 1 Using the equipment and procedures documented in this manual Assumes 20 dB attenuator used in compression test had data measured on an HP 8753 system with full 2 port calibration Power 10 dBm max min Power 6 0 dBm max min Power 0 dBm max min Power 20 dBm max min Power 60 dBm max min Power Hole Check Power 7 dBm Power 60 dBm Broadband Frequency Response Typical Response Maximum value Minimum value 2 66 Performance Tests Adjustments This chapter contains procedures that show you how to adj
50. 2 GSP shield MP3 bottom strip 08711 20054 GSP shield MP3 cover 08711 20055 DSP shield MP2 bottom strip 08711 20056 DSP shield MP2 cover 08711 20057 CPU shield MP4 bottom strip 08711 20058 CPU shield MP4 cover 08711 20059 DRAM standard instrument 256 Kbyte 1818 4268 DRAM option 1C2 instrument 1 Mbyte 1818 5337 BNC jacks 1250 1842 Fuse DIN interface 3A 125V 2110 0332 Display ribbon cable assy 8120 5526 Front panel ribbon cable assy 8120 5527 Floppy disk drive ribbon cable assy 8120 5528 Battery 3 0V 1420 0338 CPU front shield assembly 08711 60032 CPU rear shield assembly 08711 60031 Commercially available Figure 7 2 A2 CPU Assembly Replaceable Parts se eon NANA 7 4 Replaceable Parts How to Remove the CPU Assembly Disconnect the power cord Disconnect any cables from these connectors in the top row of the rear panel user TTL output limit test TTL output ext trig in out HP IB parallel port RS 232 DIN keyboard and video out Remove the front panel details are in Figure 7 1B on page 7 3 Remove the display assembly details follow Figure 7 7 on page 7 12 Remove the floppy disk drive details follow Figure 7 8 on page 7 14 Withdraw the CPU assembly from its cavity To reinstall the CPU assembly first make sure the 3 wire disk drive cable assembly is connected to it Replaceable Parts 7 5 A3 FRAC N REFERENCE ASSEMBLY Frac
51. 22 dual disk drive Insert the program disk into the left drive and type MSI 700 0 then press This command sets the current msus to drive 0 of the mass storage device at HP IB address 700 Load the performance test program by typing LOAD then press During the initialization process the program searches for the files MS CONFG and DEV_CONFG at the current MSUS If these files are not present an error is reported and you will be given an opportunity to create them The test software also contains programs for testing the HP 86200A and 86201A RF detectors so you are asked to choose what device you want to test Type 1 then press to select the HP 8711 The first menu you see is the HP 8711 performance test main menu shown below 1 PERFORMANCE amp ADJUSTMENT TESTS REPORT GENERATOR EDIT MASS STORAGE EDIT DEVICE CONFIGURATION To Edit Mass Storage You do not need to enter this menu if you are using the default setup or you have already modified this portion of the program and haven t reconfigured the system The default setup is shown below disk drive is HP 9122 program disk in unit 0 data disk in unit 1 In the main menu press the down arrow twice and S tect key once to select EDIT MASS STORAGE This menu allows you to establish in which drive the program and data files will reside VOLUME LABEL MSUS SRM DIRECTORY PATH DATA DISK 700 1 PROGRAM DISK 700 0 Performance Te
52. 8A 437B 436A 438A 437B Powrsmo 82A Low level power sensor 8481D opt H70 8481D opt H70 for option 1E1 only w reference attenuator w reference attenuator Minimum Loss Pad 11852B for opt 1EC amp 1E1 2 16 Performance Tests 2 3 HP 8711A Network Analyzer Power Meter Figure 2 5 Power Range and Accuracy Test Setup Zero and calibrate the power meter For 50 ohm analyzers use an HP 8482A power sensor For 75 ohm analyzers use an HP 8483A power sensor Connect the power sensor to the REFLECTION port as shown in Figure 2 5 Press on the analyzer To check the power range and flatness The main procedure is written for standard 50 ohm instruments Refer to the specifications table at the beginning of this test procedure for the power ranges of the other instrument options The calculation worksheet and test record list the power levels tested for all of the instrument options For all instruments 1 Press to set the power to 416 dBm The power level setting is for astandard 50 ohm HP 8711 Locate the Figure 2 17 that applies to your instru ment option located at the end of this chapter Set the analyzer power to the first nominal power level listed in Figure 2 17 Press Set the power meter to the correct cal factor for the analyzer frequency to set the CW frequency to 300 kHz Write the measured value in Figure 2 17 Repeat steps 2 and 3 for the remaining frequencies listed i
53. B cable HP 10833B 4 0 meter HP IB cable HP 10833C 0 5 meter 1 cable 108330 High frequency probe HP 85024A 50 ohm RF scalar detector HP 86200A Replaceable Parts 7 15 50 ohm RF bridge HP 86205A 75 ohm RF scalar detector HP 86201A 75 ohm RF bridge HP 86207A UPGRADE KITS Attenuator opt 1E1 upgrade kit 08711 60060 IBASIC opt 122 upgrade kit 08711 60061 Firmware kit 08711 60063 or HP 86226A SERVICE TOOLS Service tool kit 08711 60010 DOCUMENTATION HP 8711 operating amp service manual set 08711 90106 HP 8711 operating manual 08711 90107 HP 8711 service manual 08711 90108 HP 8711 schematic package 08711 90004 HP 8711 IBASIC manual set 08711 90112 7 16 Replaceable Parts POST REPAIR PROCEDURES Post Repair Procedures Replaced Assembly Adjustments Verification Tests A1 Front Panel Operator s Check A2 4 Set Serial Number Power Range and Flatness Re load correction constant file from Broadband Frequency Response disk Dynamic Accuracy OR Absolute Power Accuracy Set Serial Number System Directivity and Port Match LO Power Correction Aux Input Correction Switched Gain Correction External Detector Correction Source Power Correction B Amplitude Correction Transmission B R Correction Reflection One Port Correction R Amplitude Correction R Frequency Response Correction B Amplitude Correction CPU Frac N Reference Frequency A
54. Checksum Failure in bank Checksum Table is Blank ROM may be blank Unexpected ROM Id at number Bad ROM count in Checksum table Bad ROM size in Checksum table This tests checksum of boot ROM chip Replace CPU board or U82 Main ROM Checksum Errors Same as for test 2 This tests checksum of main flash EPROM Reload firmware from floppy disk If test still fails replace the CPU board or check the EPROM chips U51 U54 and U78 to 081 Troubleshooting 4 9 Table 4 1 HP 8711 Self Tests 2 of 4 Error Messages amp Note Bus error SIMM DRAM At address num write num read num RAM bit errors num RAM refresh errors num Test checks size of main DRAM writes reads test patterns Check reported size of DRAM on power up display Memory size should be about 1 MB typically 1040384 to 1048576 bytes Replace CPU board or check the following DRAM control circuitry U38 U41 DRAM data interface chips U69 U84 DRAM address MUX 037 058 059 086 U88 DRAM chips U61 U68 Errors Test checks size of SIMM DRAM writes reads test patterns Check reported size of SIMM DRAM on power up display Size varies de pending on options Standard Approx 0 5 MB typically 524288 bytes IBASIC opt 1C2 2 0 to 2 5 MB Make sure SIMMs are installed properly they must be installed in pairs and larger size ones should be in bank 0 same as for test 4
55. DIGITAL GROUP confirm video circuitry problems remove the CPU and place it on top of an antistatic mat on top of the analyzer Use service extender board to turn it on while it is outside the analyzer Turn the analyzer on and make sure the green Video On LED next to the display ribbon cable connector is on Check these signals HSYNC signal at TP12 24 1 kHz TTL signal VSYNC signal at TP13 60 Hz TTL signal If either of these is not normal replace the CPU board To check the DSP digital signal processor locate J32 on the CPU board an 8x3 jumper just above the DSP shield Put the jumper in the TEST position as shown on the board This replaces the 5 MHz clock from the frac N with a 5 MHz clock derived from the DSP s 40 MHz clock and provides fake data to replace the receiv er s ADC data The instrument should power up normally and display a trace with random noise data centered around 0 dB e Trace as described above the DSP circuitry is OK Check the frac N reference for a problem with the 5 MHz clock Check the receiver board for ADC problems Trace not as described above Check for the DSP s 40 MHz clock signal at TP17 If this isn t present replace Y3 Otherwise the problem is most likely in the DSP chip U97 or control circuitry SOURCE GROUP To troubleshoot the 10 MHz referencesignal if a service extender board is available put the frac N reference board on the extender Verify power
56. Errata Title amp Document Type HP 8711A RF Network Analyzer Service Manual Manual Part Number 08711 90108 Revision Date 1993 07 01 HP References in this Manual This manual may contain references to HP or Hewlett Packard Please note that Hewlett Packard s former test and measurement semiconductor products and chemical analysis businesses are now part of Agilent Technologies We have made no changes to this manual copy The HP XXXX referred to in this document is now the Agilent XXXX For example model number HP8648A is now model number Agilent 8648A About this Manual We ve added this manual to the Agilent website in an effort to help you support your product This manual provides the best information we could find It may be incomplete or contain dated information and the scan quality may not be ideal If we find a better copy in the future we will add it to the Agilent website Support for Your Product Agilent no longer sells or supports this product You will find any other available product information on the Agilent Test amp Measurement website www tm agilent com Search for the model number of this product and the resulting product page will guide you to any available information Our service centers may be able to perform calibration if no repair parts are needed but no other support from Agilent is available Agilent Technologies HP 8711A RF NETWORK ANALYZER SERVICE MANUAL SERIAL NUMBERS This m
57. Error occurs while firmware is being loaded before 2 beeps are heard reload firmware from disk by in serting the firmware disk into the internal disk drive and turning the instrument power on Press at the load firmware query The process will take a few minutes Watch the CRT for information during the loading procedure If the instrument locks up during or after the firmware loading try clearing the SRAM turn off power to the analyzer then turn it back on While the analyzer is going through its self tests Main and SIMM DRAM tests or shortly afterwards press PRESET few times When the analyzer pauses after performing the CPU main self tests it displays a query about zeroing the non volatile SRAM Note the caution message Press to zero the SRAM Reload the firmware from disk again 4 8 Troubleshooting A self test fails the analyzer indicates the number of the first failed self test in two ways 1 An error message appears on the CRT 2 Test Status LEDs display a number code corresponding to the number of the failed test Test status LEDs include one red LED one green LED and 7 segment LED which displays the digits 0 through 9 The red and green LEDs are located to the left of the 7 segment LED when viewed from the rear panel Test status LEDs code Red LED and 7 segment LED on test numbers 1 through 9 Green LED and 7 segment LED on tests 10 through 19 Only green LED on all self tests passed Table 4 1 lis
58. Frequencies 300 kHz 299 9985 kHz 1 MHz 0 999995 MHz 5 MHz 4 999975 MHz 10 MHz 9 999950 MHz 50 MHz 49 99975 MHz 100 MHz 99 99950 MHz 500 MHz 499 9975 MHz 1000 MHz 999 9950 MHz 1300 MHz 1299 9935 MHz 300 0015 kHz 1 000005 MHz 5 000025 MHz 10 000050 MHz 50 00025 MHz 100 0005 MHz 500 0025 MHz 1000 0050 MHz 1300 0065 MHz 0 0015 kHz 0 000002 MHz 0 000007 MHz 0 000011 MHz 0 000064 MHz 0 000127 MHz 0 000632 MHz 0 001260 MHz 0 001586 MHz Dynamic Range Compression 10 dBm Noise Floor Narrowband Mode 300 kHz to 5 MHz 5 MHz to 1 3 GHz Broadband Mode 10 MHz to 1 3 GHz 1 Using the equipment and procedures documented in this manual Assumes 20 dB attenuator used in compression test had data measured on an HP 8753 system with full 2 port calibration Performance Tests 2 59 502 STANDARD HP 8711A Test Record 4 of 4 Serial Number Report Number Test Minimum Measured Maximum Measurement Test Description speeioation speciation Power Range and Flatness Power 16 dBm max min Power 7 0 dBm max min Power 0 dBm max Power Hole Check Power 13 dBm Power z 0 dBm Broadband Frequency Response Typical Response Maximum value Minimum value 0 5 dB Pass Fail Pass Fail 1 Using the equipment and procedures documented in this manual Assumes 20 dB attenuator use
59. ING POWER SUPPLY PS PROBLEMS 4 5 Check the Rear Panel LEDs cece 0 eee hh hh hn 4 5 Measure Power Supply Voltages sees I 4 6 Remove Assemblies cece cece cece cece cece ehh he hh tht 4 7 TROUBLESHOOTING DIGITAL GROUP PROBLEMS 4 7 Error During Power up 0 2 0 ee eee cece ee ee cee ehm hn nnn 4 8 Front Panel Problems Pe Se eee ee ole ee eee sed 4 13 TROUBLESHOOTING SOURCE GROUP PROBLEMS 4 13 Phase Lock Problems Rie ee a Ew eR RI SSA 4 13 Source Power Problems cece ee een mh htt 4 14 Spurious Signals o o eee eee ee eee eee eter ee ee A 4 14 TROUBLESHOOTING RECEIVER PROBLEMS 0c cece cece cence teen teenies 4 15 Trac at 200dB soe Renee ba ane SOLUM ESI eats Fee ORE 4 15 Random Noise Trace _____ e e a S Rer 4 16 Spurs in the Data Trace 2 eee eee cee II Inh 4 16 incorect Data RR IRAM A torn de scene ee a fran 4 16 Receiver Power Problems 3 eee e eee hn tnn 4 17 DETAILED TROUBLESHOOTING 0 cc cece cece mh hrs 4 18 Digital Group cc cee reece een hn mI he ttn 4 18 Source Group 0 ccc cece cece eet eee eee hh hh nnn 4 18 Receiver Group 0
60. If you are using HP BASIC from an external controller enter OUTPUT 716 DIAG SNUM XXXXXXXXXX and press On the analyzer press This assumes that the HP 8711 is at address of 16 and the HP IB is at 7 If not either use the analyzer s actual address or change the analyzer s address to 16 If you are using IBASIC Press SYSTEM OPTIONS If you have a DIN keyboard enter the following 10 OUTPUT 800 DIAG SNUM XXXXXXXXXX and press 20 END and press If you don t have DIN keyboard use the front panel knob and Character of the commands above Press 3 Press to verify that you correctly installed the serial number The serial number is displayed in the dialogue box Adjustments 3 11 In Case of Difficulty If the analyzer displays an error message that tells you the serial number has the wrong format check the rear panel serial number tag again and verify that you have the correct serial number If the analyzer displays an error message that tells you Serial number already set that means a serial number is already installed on that CPU board Contact your nearest HP service center for instructions 3 12 Adjustments LO POWER CORRECTION ADJUSTMENT This procedure shows you how to set the DAC digital to analog converter that controls the LO power level By setting the LO power you are optimizing the mixer performance for spurs versus stability minimal drift The anal
61. NUAL TESTS Performance Test Worksheet and Record ccc cece cee cee ence renee ences 2 1 FREQUENCY RANGE AND ACCURACY PERFORMANCE TEST If the Analyzer Fails the Test cece erence nee eee trt 2 2 DYNAMIC RANGE PERFORMANCE TEST cece eee cece eee e eee t eee nene If the Analyzer Fails the Test 0 0 0 cc cece cc ccc ccc cece tree eee e hm nnn 2 3 POWER RANGE AND FLATNESS PERFORMANCE TEST If the Analyzer Fails the Test 2 4 BROADBAND FREQUENCY RESPONSE PERFORMANCE TEST If the Instrument Fails the Test 2 cc ce hh mnn VERIFYING PERFORMANCE WITH AUTOMATED TESTS SETTING UP AN AUTOMATED SYSTEM 20 cece eee e eee 39999999931 System Hardware Requirements cece ere cee cece III System Software Requirements cece eee cece eee eet III BACKING UP THE SOFTWARE PROGRAM eee cece cece eee eee nent nnn HP 8711A Contents 1 1 1 1 1 2 1 2 1 2 1 2 1 3 2 1 2 2 2 2 2 2 2 2 2 2 2 3 2 4 2 7 2 7 2 8 2 8 2 9 2 9 2 10 2 12 2 13 2 15 2 16 2 19 2 20 2 21 2 22 2 22 2 22 2 23 2 25 LOADING AND RUNNING THE TEST SOFTWARE 2 27 TO Edit Mass Storage Rl p due Te a ioe eae rue 2 27 To Edit
62. OT going to make the frac N spur adjustment reassemble the analyzer 3 4 Adjustments FRACTIONAL N SPUR ADJUSTMENT This adjustment minimizes the spurs caused by the analog phase interpolators APIs on the frac N board An external controller sets the source output frequencies on the HP 8711 and sets up the spectrum analyzer to mea sure the spur Then you adjust potentiometers to minimize the spur __ EO W BASIC 5 0 or higher 200 300 200 300 Test sofware Test port cable 8120 4781 8120 4781 Service extender board p o service kit p o service kit 08711 60010 08711 60010 Note Before performing this adjustment Check the voltage at A3TP11 as described in the previous adjustment fractional N VCO adjust ment steps 3 through 5 and adjust as required 1 If you already have the frac N board assembly out of the analyzer and attached to the service board extender continue with step 4 If not continue with the next step 2 Switch off the instrument power Remove the front panel by following these steps and referring to Figure 3 3 a Remove the trim strip from the handles b Remove the four 10 torx screws attaching each handle to the instrument c Pull the analyzer toward you to extend about two inches over the table top d Grasp and pull the front panel with two hands one on the top middle of the panel and the other on the bottom middle of the panel Disconnect the front
63. Performance Tests section of this manual If the test fails perform the LO Power Correction and Fractional N Spur Adjustment procedures in the Adjustments sec tion of the manual then run the Spurious Signals test again Check RF at A4J4 connect a spectrum analyzer to the source RF output at A4JA Set the 8711 to a series of CW frequencies e g 10 MHz 500 MHz 1 GHz and use the SA to check for harmonics and other spurs The specification for harmonics is lt 20 dBc below 1 MHz and lt 30 dBc above 1 MHz Non harmonic spurious signals are not specified but typical values are the same as for harmonics Connect the spectrum analyzer to the receiver LO output at A4J1 and repeat If everything meets the specifications go to the Troubleshooting Re ceiver Problems section Spurs in source output only replace the source assembly Spurs in receiver output only replace the source assembly Spurs in source and receiver outputs the problem may be due to spurs in the 10 MHz or frac N inputs to the source Fractional N spurs are not specified so use the Fractional N Spur Adjustment to improve the spur performance but do not replace the frac N board unless these spurs cause the HP 8711 to fail its harmonics specifications 4 14 Troubleshooting Check 10 MHz at A3J3 use oscilloscope Look for a 2V 10 MHz pulse A spectrum analyzer should be used only if a blocking capacitor is also used since the 10 MHz outp
64. Printer HP 8711A Network Analyzer HP IB Address 701 HP IB Address 700 Load Open Short Figure 2 14 Setup for System Directivity Test Set up the equipment as shown in Figure 2 14 Load the test software by following the procedure in Loading and Running the Test Software located earli er in this chapter Select Directivity and Port Match from the performance tests main menu Make a reflection measurement calibration by following the prompts on the analyzer screen Connect the type N cable to the REFLECTION port Follow the prompts to perform another reflection cal ibration at the end of the cable using the female cal kit devices 2 46 Performance Tests 6 When prompted connect the type N cable between the REFLECTION and TRANSMISSION ports as shown in Figure 2 15 The analyzer measures the transmission port match and then stores the test data to a disk Controller Disk Drive ThinkJet Printer HP 8711A Network Analyzer Figure 2 15 Setup for Measuring a Thru Cable 7 Toprint the test results ina test record format refer to the procedure in Printing Performance Test Results located earlier in this section If the Analyzer Fails the Test If the analyzer fails the test examine the connectors of the analyzer test ports cables and calibration kit devices Directivity problems are most likely caused by a faulty default calibration standard load device test port con
65. Procedures 0 2 ee eee een 5 11 Upgrading Firmware 5 4 rer error re cab eee Neuen a 5 12 Making a Current Correction Constants Disk 1 5 12 UPGRADING THE FIRMWARE cc ccc cece cece cee cence eee een ean 5 12 HP IB COMMAND REFERENCE FOR SERVICE 0 cece ces e cece eee e eee n 5 14 Syntax Summary ee rb serere sri pe ees d sre pha E M e beens 5 14 Softkey SCPI Commands 2 cece cece eee ee ee Ine 5 14 Alphabetical SCPI Command Summary 0 cee cece cece cece cece 5 15 THEORY OF OPERATION INTRODUCTION ea ieee Rec eater et ne ge ere s prete Pe 6 1 SYSTEM THEORY Preces xe save ices e E 6 1 ANALYZER FUNCTIONAL GROUPS ccc e cece cece eene m n n nn 6 2 POWER SUPPLY THEORY Sis aegis lod Seve aoe elec eve eed dud 6 2 DIGITAL CONTROL THEORY aie ede bed cin esr I hn RE ELE wale ER VS 6 3 A1 Front Panel 5 22 5 IR TAG ed SSeS e nene Mv wer ERE S 6 3 2 CPU se pete eee See Shas ease Rede 6 3 AT Display E NUN S Y A e See e YN Wee 6 4 AB Floppy Disk Drive lvl e e E re e RR eer wis tere Ex ETE 6 4 SOURCE THEORY ene Ii EP I E Uer sr rere des Kom bs gid Ma oes 6 4 Fractional N Reference 2
66. STMENTS MENU Allows the user to select a diagnostic self test Tests may be selected by entering the number of the test with the keypad or using the RPG or up down arrow keys to scroll through the list of tests The num ber description and test status of the currently selected test are shown Possible test status notations are PASSED FAILED and NOT DONE See Self tests for a listing of all the tests and their descriptions If any test fails refer to Chapter 4 Troubleshooting in this manual Some tests are run during power up and the results of these tests will be displayed when the test is selected These tests cannot be executed from this menu Allows the user to select an adjustment test Tests are listed in the order that they should be performed The one exception to this rule is that adjustment number 110 should be performed before perform ing adjustment number 109 To select a test use the numeric keypad to enter the test number or use the RPG or up down arrow keys to scroll through the list The number description and test status of the currently selected test are shown Possible test status notations are PASSED FAILED and NOT DONE See Adjust ments for a listing of the adjustments and their descriptions Executes the selected test if that test is currently implemented This stops any test that is currently running Goes back to the main service menu SELF TE
67. STS Internal tests in the HP 8711A are divided into two categories self tests and adjustment tests Self tests are diagnostic tests which can be used in troubleshooting the analyzer Only the ones marked with an asterisk below are executed during the power up sequence The pass fail status of these tests can be checked by scrolling through the list of self tests Also if any test fails during power up the number of the first test to fail will be displayed on the Test Results LED which is visible from the rear panel The other tests run only when selected from the service menus Note There are two LEDs to the left of the seven segment Test Results LED on the rear panel of the HP 8711A The red LED is on for self tests 1 through 9 and the green LED is on for tests 10 through 19 1f all tests pass the green LED will be on and the red LED and the seven seg ment LED will be off Test Name Executes internal tests of 68020 main CPU Checks all registers 1 680x0 Processor Checks logic math shift rotate and bit manipulation instructions Boot ROM Checksum Checksum of boot ROM to verify boot ROM firmware code Main ROM Checksum Checksum of flash EPROM to check main firmware Test runs during power up 5 2 Service Key Menus 4 Main DRAM Writes a series of test patterns to the main DRAM and reads them back Checks size of main DRAM 5 SIMM DRAM Tests SIMM DRAM by writing to the DRAM and then rea
68. To Permanently Store CCs in the Analyzer part of Storing and Recalling CCS at the end of this chapter 4 Ifyou ARE going to make more adjustments save the correction constant data th Insert a formatted disk into the internal disk drive Press This creates a file or writes over an existing file with the name CC_data Adjustments 3 23 R AMPLITUDE CORRECTION ADJUSTMENT This procedure shows you how to generate correction constants to improve absolute power accuracy in R mea surements Frequency effects are corrected in R Frequency Response Correction Test 109 key during this adjustment the analyzer will abort the test R Recommended Model or Part Number Equipment 50 ohm std 75 ohm opt 1EC Caution You must run adjustment tests 103 ext det corr and 104 source power before running the R amplitude correction adjustment 1 Connect a termination included in the HP 85032B E or 85036B E calibration kit to the REFLECTION port At the beginning of the test the analyzer is measuring low power levels that are below the displayed range The message data periodically appears in the upper left of the screen when the analyzer is making mea surements The analyzer also displays a message and then presets when the test is complete 2 Press If the analyzer displays an error message and aborts the adjustment the calibration data from tests 103 and 104 are probably bad
69. URCE POWER ALC CORRECTION ADJUSTMENT 3 18 In o Difficulty rrr rer ertet eger Bb vies ove Ere 3 20 B AMPLITUDE CORRECTION ADJUSTMENT ccc cece cect cece ce ener tet eenee 3 21 TRANSMISSION B R CORRECTION ADJUSTMENT 3 22 REFLECTION ONE PORT CORRECTION ADJUSTMENT 3 23 R AMPLITUDE CORRECTION ADJUSTMENT 0 cece cece e e nnn 3 24 R FREQUENCY RESPONSE CORRECTION ADJUSTMENT 3 25 B AMPLITUDE CORRECTION ADJUSTMENT 0 000 cece ect e nnn 3 26 STORING AND RECALLING CORRECTION CONSTANTS 3 29 To Permanently Store CCs in the Analyzer 0 cc cee cee cece 3 29 To Temporarily Store CCs to Disk for Later Recall 3 29 To Recall CCs from Disk Gare rr I ER TR ER Gis gin E VS e dones 3 29 To Restore Previous CCs after Replacing the 2 CPU Board 3 30 To Replace Suspected Incorrect cc cece cee cc cc 3 30 To Archive Current CCs to Disk ce cece te teen een 3 30 If ROM Appears to be Blank Message is Displayed at 3 30 If Warning No Correction Constants Installed Is Displayed at Power UP 3 30 Step 1 Storing Correction Constants to
70. Write pass or fail on the test record located at the end of this chapter to set the analyzer sweep range for a start frequency to set the analyzer sweep time to 300 seconds 5 minutes If any points fail enter the power meter cal factor for that point and check again 7 Repeat steps 3 through 6 for the second power level listed on the test record For 50 ohm option 1E1 use an HP 8481D option H70 power sensor for the 60 dBm setting For 75 ohm option 1E1 put an HP 11852B minimum loss pad between the REFLECTION port and the HP 8481D option H70 power sensor If the Analyzer Fails the Test If the analyzer fails the test check that the power meter and power sensor are operating to specification Also inspect all connectors for damage Refer to Source Power Correction in the Adjustments chapter If the analyzer still fails the test refer to the Troubleshooting chapter Performance Tests 2 19 2 4 BROADBAND FREQUENCY RESPONSE PERFORMANCE TEST Use this procedure to check the frequency response of the broadband B power input There are no warranted specifications for this characteristic but typical values are provided The frequency response combined with the absolute power accuracy determines the total power accuracy of the B input In this test areference power level is set ata CW frequency of 30 MHz The B input is normalized to this level Then the CW frequency is changed and the change in
71. able A4J4 to A5 cable Backplane cover not shown Figure 7 1A Major Assemblies and Cables 7 2 Replaceable Parts A1 FRONT PANEL ASSEMBLY Front panel assembly Keyboard assembly 3 10 machine screw Probe power socket part of dress panel RPG rotary pulse generator assembly Knob for RPG Fuse for power probe socket 0 75A 125V Labe HP 8711A Label front dress Front handle nut plate not shown M4x10 machine screws for handles M3x6 machine screws for nut plato Commercially available Figure 7 1B Front Panel Assembly Replaceable Parts 08711 60001 08711 60101 0515 0374 08711 60037 HANH Aaa How to Remove the Front Panel Assembly Disconnect the power cord Remove the front handles trim strip first Pull the center top of the front panel up slightly and pull the center bottom down slightly to release the two catches Then pull the front panel away from the cabinet several inches Disconnect the ribbon cable from the circuit board If you need to remove one of the assemblies inside the analyzer remove the metal front handle nut plates 2 To remove the RPG knob pull it off its splined shaft To remove the RPG disconnect the five wire cable from J2 Remove the knob hex nut and washer Note The probe power fuses are in sockets g Replaceable Parts 7 3 A2 CPU ASSEMBLY A2 CPU assembly new 08711 60002 A2 CPU assembly R E 08711 6900
72. ace Displaysthe narrowband transmission frequency response cal array as a memory trace Displays the broadband R frequency response cal array as a memory trace Presets the instrument Goes back to the meas cal options menu UPDATE CORR CONST MENU For a description of when and how to use these keys refer to Storing and Recalling Correction Constants in Chapter 3 Adjustments Loads permanent copy of CC data from disk to EPROM This key combines the functions Displays a banner which describes the keys of this menu This copies the contents of the correction constant file named data from the internal floppy disk drive into RAM The user cannot select an alternate disk drive It allows the user to copy a partially modified set of data into RAM and then continue with the rest of the adjustments 5 8 Service Key Menus At power up correction constants are copied from the flash EPROM to a RAM buffer Any changes to the CCS are made to the buffer only Pressing this key creates a disk file named data that con tains the correction constants from the buffer This file is always written to the internal disk drive regardless of the disk drive selected using the save recall functions The file will be written over any existing file with the same name This alters the nonvolatile correction constants stored in the analyzer The flash EPROM must be cleared first via firmware update If not the user i
73. ake more adjustments save the correction constant data that you ve generated so far insert a formatted disk into the internal disk drive Press 2 This creates a file or writes over an existing file with the name CC data Adjustments 3 17 SOURCE POWER ALC CORRECTION ADJUSTMENT In this procedure the analyzer creates a table of values that corrects the source output power over different fre quencies and power levels The HP 8711 reads values from a power meter to determine the actual source output level An HP 437B or HP 438A with firmware revision 3 0 or greater power meter is required for this test Other power meters will not be controlled correctly by the analyzer If your HP 8711 has a step attenuator installed option 1E1 you need an HP 8481D option H70 power sensor for part of the adjustment procedure The option H70 has 100 kHz to 4 GHz frequency range This adjustment takes approximately five to ten minutes to run depending on the installed options Jf you press the key during this adjustment the analyzer will abort the test Recommended Model or Part Number Equipment 50 ohm std 75 ohm opt 1EC 7 EP 578A for opt 1E1 instruments only _______ _______ A 5 HP 8711A Network Analyzer Attenuator or Min Loss Pad Powor Sensor Figure 3 9 Setup for Source Power Correction Note Before you begin this ad
74. and Mode 10 MHz to 1 3 GHz 1 Usingthe equipment and procedures documented in this manual Assumes 20 dB attenuator used in compression test had data measured on an HP 8753 system with full 2 port calibration Performance Tests 2 63 752 STANDARD HP 8711A Test Record 4 of 4 Serial Number Report Number Test Minimum Measured Maximum Measurement Test Description _ specification Specification Uncertainty Power Range and Flatness 0 5 dB Pass Fail Pass Fail 1 Using the equipment and procedures documented in this manual Assumes 20 dB attenuator used in compression test had data measured on an HP 8753 system with full 2 port calibration Power 13 dBm max Power 6 0 dBm max Power 0 dBm max Power Hole Check Power 10 dBm Power 0 dBm Broadband Frequency Response Typical Response Maximum value Minimum value 2 64 Performance Tests 750 OPTION 1E1 HP 8711A Test Record 3 of 4 Serial Number Report Number Date Test Minimum Measured Maximum Measurement Test Description Specification Specification Uncertainty 2 1 Frequency Range and Accuracy Frequencies 300 kHz 299 9985 kHz 1 MHz 0 999995 MHz 5 MHz 4 999975 MHz 10 MHz 9 999950 MHz 50 MHz 49 99975 MHz 100 MHz 99 99950 MHz 500 MHz 499 9975 MHz 1000 MHz 999 9950 MHz 1300 MHz 1299 9935 MHz 0 0015 kHz 0 000002 MHz 0 0
75. anual applies directly to any HP 8711A network analyzer with the serial prefix 3325A Copyright HEWLETT PACKARD COMPANY 1992 1400 FOUNTAINGROVE PARKWAY SANTA ROSA CA 95403 U S A MANUAL PART NO 08711 90108 Printed JULY 1993 U HEWLETT PACKARD CERTIFICATION Hewlett Packard Company certifies that this product met its published specifications at the time of shipment from the factory Hewlett Packard further certifies that its calibration measurements are traceable to the United States Na tional Institute of Standards and Technology NIST formerly NBS to the extent allowed by the Institute s calibration facility and to the calibration facilities of other International Standards Organization members WARRANTY This Hewlett Packard system product is warranted against defects in materials and workmanship for a period corre sponding to the individual warranty periods of its component products Computer and computer peripherals are war ranted for a period of 90 days Instruments are warranted for a period of one year During the warranty period Hewlett Packard Company will at its option either repair or replace products which prove to be defective Warranty service for products installed by HP and certain other products designated by HP will be performed at Buy er s facility at no charge within HP service travel areas Outside HP service travel areas warranty service will be per formed at Buyer s facility only upon HP s pri
76. ardware Requirements 2 22 Hotline for Parts 7 2 How to Clear SRAM 5 11 How to Order Parts 7 1 HP IB Command Reference 5 14 IF Gain Auto 5 7 IF Gain AUTO man 5 7 IF Gain Hi on OFF 5 7 IF Gain Lo ON off 5 7 Initialize a Disk 2 25 Installed Options to See on Screen 5 6 Instrument Info 5 6 Internal Diagnostics 5 1 L Language Extensions 2 24 Line Fuse 7 11 LO Power Adjust 5 7 Index i LO Power Correction Adjustment 3 13 Load CC from Disk 5 8 Load the Operating System and Binaries 2 24 Loading and Running the Test Software 2 27 Major Assemblies 7 2 Manual Performance Tests When to Perform 2 2 Mass Storage 2 27 Maximum Input Level 2 4 Meas Cal ON off 5 7 Meas Cal Options Menu 5 7 Miscellaneous Parts 7 15 More Svc Utilities 5 7 More Svc Utilities Menu 5 7 N Narrowband Response 5 8 Noise Floor 2 14 Operating Characteristics 2 5 Operating System and Binaries 2 24 Operator s Check 2 7 When to Perform 2 2 Organization of Service Manual 1 1 P Parts Hotline 7 2 Parts ID 7 8 Parts How to Order 7 1 Parts How to Remove 7 1 Performance Tests 2 1 Absolute Power Accuracy 2 41 Automated 2 22 Broadband Frequency Response 2 20 Dynamic Accuracy 2 34 Dynamic Range 2 13 Failures 2 2 Frequency Range and Accuracy 2 10 Manual Tests 2 9 Operator s Check 2 7 Power Range and
77. at you ve generated so far atted disk into the internal disk drive Press This creates a file or writes over an existing file with the name data Adjustments 3 13 SWITCHED GAIN CORRECTION ADJUSTMENT In this procedure the HP 8711 sets the gain for each analyzer input The HP 8711 can apply different gains to the R A and B input signals to make sure that the signal is in the correct range for proper ADC analog to digital converter operation If you press the key during this adjustment the analyzer will abort the test Caution Place the analyzer onan anti static mat and wear a connecting wrist strap when making this adjustment Fito UehmentiE __ pn 8120 4761 SEF pn 8120 2408 Cable HP p n 08360 20105 HP p n 08360 20105 SMA m SMA m 1 Remove the handles and front panel a Remove the trim strip on the side of the handles b Remove the screws that attach the handles to the analyzer frame c Pull the analyzer toward you to extend about two inches over the tabletop d Grasp and pull the front panel with two hands one on the top middle of the panel and the other on the bottom middle of the panel You can disconnect the front panel ribbon cable to move the front panel out of the way but you need to reconnect it later so you can press the necessary softkeys for the test 2 Press 3 Disconnect the SMA cable between the source A4J4 and receiver 5 3 on t
78. ber and firmware revision TEST SELect num Select the adjustment or self test to execute TEST STATe lt string gt Select the state of the active adjustment or self test Choose from RUNI CONTinue STOP Query response will be NULLIPAUS DONE oo ne yr NR1 zero indicates no failures found Any other character indicates a failure Service Key Menus 5 15 Theory of Operation INTRODUCTION Theory of Operation begins with a general description of the operation of a network analyzer system This is followed by more detailed operating theory for the HP 8711 in particular divided into functional groups The operation of each group is described briefly to the assembly level only Detailed component level circuit theory is not provided here Simplified block diagrams illustrate the operation of each functional group A more detailed overall block dia gram is provided at the end of the Troubleshooting section SYSTEM THEORY Anetwork analyzer system consists of a source signal separation devices a receiver and a display The HP 8711 integrates a synthesized RF source with built in couplers for signal separation a combination narrowband and broadband receiver and a display Figure 6 1 shows a simplified system block diagram for the HP 8711 In the HP 8711 the A3 fractional N reference and A4 source assemblies provide the synthesized RF source output The 5 receiver assembly separates the signals into re
79. ccessories for the HP 8711 The tests do require you to interact with the program and are best described as semi automated This section is organized as follows e Setting up an automated system e backing up the software program e loading and running the test software e printing performance test results e spurious signals automated performance test dynamic accuracy automated performance test absolute power accuracy automated performance test e system directivity and port match automated performance test SETTING UP AN AUTOMATED SYSTEM System Hardware Requirements Controllers You can use HP 9000 series 200 300 controllers except model 226 to run the performance tests Disk Drive and Printer The automated tests require a disk drive for mass storage and a printer The software is formatted double sided and provided on a 3 5 inch floppy disk There are many compatible disk drives The following drives are recommended in Figure 2 7 as a convenience only most double sided HP drives will work The required measurement instrumentation is listed in the test procedure Figure 2 7 Compatible Disk Drives To record test results you must have a printer The printer generates a hardcopy of all automated test results and are output in test record format Some compatible printers are listed in Figure 2 8 2 22 Performance Tests HP 2225A ThinkJet HP 2671G 2673A Thermal Printer HP 9876A The
80. ccuracy Adjustment Frequency Range and Accuracy Test Fractional N VCO Adjustment Spurious Signals Test Fractional N Spur Adjustment A4 Source LO Power Correction Power Range and Fiatness Source Power Correction Spurious Signals Test Receiver AS LO Power Correction Dynamic Range Test Switched Gain Correction Power Range and Flatness Aux Input Correction Broadband Frequency Response External Detector Correction Dynamic Accuracy Test Source Power Correction Spurious Signals Test B Amplitude Correction Absolute Power Accuracy Test Transmission B R Correction Reflection One Port Correction R Amplitude Correction R Frequency Response Correction B Amplitude Correction System Directivity and Port Match Aa Power Supp __________ AT Dini Check nsi A8 Floppy Disk Drive Functional test write and read a file to disk Replaceable Parts 7 17 A Absolute Power Accuracy Automated Performance Test 2 41 Accessories ID 7 15 Adjustment Description 3 1 Adjustments 3 1 B Amplitude Correction 3 21 B Amplitude Correction 3 26 External Detector Correction 3 16 Firmware 3 1 Fractional N Spur 3 5 Fractional N VCO 3 3 Frequency Accuracy 3 9 LO Power Correction 3 13 R Amplitude Correction 3 24 R Frequency Response Correction Adjustment 3 25 Reflection Correction 3 23 Set Serial Number 3 11 Source Power C
81. changed when the gain is turned on Goes to the more service utilities menu which allows the user to manually control the ALC DAC step attenuator LO power and the autozero DACS for the R and B inputs Goes back to the service menu MORE SVC UTILITIES MENU Allows manual adjustment of the Automatic Level Control ALC DAC which controls the source output RF out connector power level Disables the ALC power calibration until a power level is en tered using the Power menu Allows manual control of the step attenuator if one is installed gt duit Allows manual adjustment of the DAC which controls the LO output power The LO power is used by the receiver board Allows manual adjustment of the DAC used to set the offset for the R and X channel chopper used in zeroing the R detector Analog bus node 14 can be used to check the voltage output of the DAC Range 0 4095 The number 2048 corresponds to near zero offset Allows manual adjustment of the DAC used to set the offset for the B and Y channel chopper used in zeroing the B detector Analog bus node 13 can be used to check the voltage output of the DAC Range 0 4095 The number 2048 corresponds to near zero offset Goes back to the service utilities menu MEAS CAL OPTIONS MENU The HP 8711 uses array of calibration data to improve the measurements made by the hardware This menuallow the user to disable the calibration and view
82. cold solder joints Initial Observations Prepare the analyzer for observation by performing these steps 1 Disconnect all accessories and peripherals 2 Remove the disk if any from the internal disk drive 3 Connect a cable between RF OUT and RF IN the reflection and transmission ports Turn on the analyzer and watch for the proper turn on sequence 1 Disk drive light goes on briefly and a beep is audible from the CPU 2 The CRT lists the boot ROM self tests being performed 3 Disk drive light goes on Firmware loads from ROM The analyzer beeps twice when this is done 4 The CRT displays the status of the main self tests 5 During the next 5 seconds these messages appear on CRT Initializing Calculating correction coefficients Troubleshooting 4 1 6 The graticule is displayed along with information on the model number firmware revision and installed options Press PRESET The display should show a transmission trace a flat line at 0 dB If not make sure the cable be tween the RF OUT and RF IN ports is good If the analyzer does not turn on check the AC line power Make sure that the line voltage selector below AC power plug is set correctly Check the fuse If the analyzer does not go through the steps above or if any error messages appear or if the problem persists refer to Troubleshooting the Analyzer following Operator s Check Perform the Operator s Check procedure in the
83. d in compression test had data measured on an HP 8753 system with full 2 port calibration 2 60 Performance Tests 502 OPTION HP 87114 Test Record 3 of 4 SerialNumber Number SerialNumber RepotNumber Number Test d Measured Maximum Measurement Test Description Minimum Maximum Frequency Range and Accuracy Frequencies 300 kHz 299 9985 kHz 300 0015 kHz 0 0015 kHz 1 MHz 0 999995 MHz 1 000005 MHz 0 000002 MHz 5 MHz 4 999975 MHz 5 000025 MHz 0 000007 MHz 10 MHz 9 999950 MHz 10 000050 MHz 0 000011 MHz 50 MHz 49 99975 MHz 50 00025 MHz 2 0 000064 MHz 100 MHz 99 99950 MHz 100 0005 MHz 0 000127 MHz 500 MHz 499 9975 MHz 500 0025 MHz 0 000632 MHz 1000 MHz 999 9950 MHz 1000 0050 MHz 0 001260 MHz 1300 MHz 1300 0065 MHz 0 001586 MHz Dynamic Range Compression 10 dBm Noise Floor Narrowband Mode 300 kHz to 5 MHz 5 MHz to 1 3 GHz Broadband Mode 10 MHz to 1 3 GHz 1 Using the equipment and procedures documented in this manual Assumes 20 dB attenuator used in compression test had data measured on an HP 8753 system with full 2 port calibration Performance Tests 2 61 502 OPTION HP 87114 Test Record 4 of 4 Serlal Number Report Number Test Minimum Measured Maximum Measurement Test Description Specification Specification Uncertainty Power Range and Flatness 0 5 dB
84. ding the data back Checks size of SIMM DRAM 340x0 GSP Processor Performs a test of the TMS 34010 graphics system processor Tests the display video RAM 7 GSP Video Tests the video circuitry Not used This test number is not used because the test status LED powers up with the number 8 as the default If there is a problem with the 320C25 Program SRAM Checks the program SRAM used by the TMS 320C25 digital signal processor 68020 CPU this 8 will remain displayed on the LED 10 320C25 DSP Processor Tests the TMS 320C25 digital signal processor 11 68020 amp 320C25 Not implemented Communication 12 Backplane Bus Tests the ability of the 68020 to access the other boards through the backplane assembly 13 Non volatile SRAM Tests the integrity of the contents of battery backed SRAM Detects loss of power to the SRAM 14 Digital IF Control Not implemented 15 CPU Support Circuitry Tests various circuits that are required for the main processor 68020 to operate Tests 68901 MFP chip timers interrupts Attempts to clear and disable all interrupts Tests each interrupt signal to the 68020 to make sure that none of them are asserted 16 Analog Bus Tests the analog bus control circuitry and 5 and EPROM Vpp on the CPU board 17 Real Time Clock Tests the real time clock and tries to access registers on the chip 18 Front Panel Interface Tests the front panel control processor Tr
85. e HP 8711 Schematic Package available separately to troubleshoot further Make sure the printer or plotter has power turned on paper pens pinch wheels down and so forth Plotters should not be in VIE ify that the RS 232 device has been selected as the hardcopy device by press ing HARDCOPY The first line on the CRT shows the current device selection The second line shows the baud rate parity andshake information If any of this is incorrect enter the correct information Refer to the printer or plotter manual for proper parameters Refer to the HP 8711 Operating and Programming manual for more details on hardcopy options Try to make a print or plot from another instrument or a computer to confirm that the printer plotter is working If it is replace the CPU board 4 2 Troubleshooting Centronics Printers and Plotters If a Centronics interface problem is indicated during power up with no peripheral connected there may be a problem with the Centronics control chips U2 U3 U35 Replace the CPU board or refer to the HP 8711 Schematic Package available separately to troubleshoot further Make sure the printer or plotter has power turned on paper pens pinch wheels down and so forth Plotters should not be in VIEW mode Verify that the Centronics device has been selected as the hardcopy device by pressing wampcoev The first line on the CRT shows the current device selection The second line should say
86. e data trace around 0 dB replace the CPU Random Noise Trace If the trace displays rand k the cable connections between the source and receiver and tighten if necessary Press CHANT W nooba ditoal 9 and observe R input trace on the CRT Press with the reflection port open and observe the trace Pr with a through cable connected between the reflection and transmission ports Observe the trace If all three show noise floor traces noise at or below 80 dB the receiver LO is probably bad Verify receiver LO output from sourceat A4J1 settheanalyzer to any CW frequency The receiver LO signal should be 27 778 kHz away from the CW source RF frequency If this signal is not present or if the frequency is significantly wrong replace the source board Note that the fractional N and 10 MHz inputs to the source board are assumed to be okay because the RF OUT signal is okay If the receiver LO signal is okay replace the receiver board Spurs in the Data Trace This section addresses repeatable or predictable spurs and jumps in the data trace rather than random noise Use a spectrum analyzer or power meter to check the output of the source at the reflection port to see if the spurs are in the RF output signal If they are go back to Source Group Troubleshooting Perform the Switched Gain Correction adjustment in the Adjustments section of this manual If the prob lem persists replace the receiver board
87. e parts are noted with an asterisk To order the part use the part num ber listed state the quantity desired and address the order to the nearest Hewlett Packard office To save money or time read the following paragraphs To order parts not listed include the instrument model number complete instrument serial number description and function of the part and quantity desired Save Money by Ordering R E Rebuilt Exchange Assemblies If you need to replace an assembly and would like to save money consider a R E rebuilt exchange assembly These factory repaired tested assemblies are available on a trade in basis They meet all factory specifications required of a new assembly They are designated R E in the following parts lists Replaceable Parts 7 1 Save Time by Calling 800 227 8164 To order parts as fast as possible call the above number Monday through Friday 6am to 5pm PST You will contact HP parts specialists with direct on line access to the parts listed in this manual Four day delivery is standard one day hotline delivery is available for an additional charge Outside of the United States contact your nearest HP office MAJOR ASSEMBLIES behind behind A2 A6 HP Part Numbor Qty Front panel assembly removed CPU assembly Frac N reference assembly Source assembly Receiver assembly Power supply CRT assembly Floppy disk drive A4J1 to A5 cable A4J2 to A3J1 cable A4J3 to c
88. each test procedure for suggestions and references to resolve analyzer operation problems Recommended Test Equipment The recommended test equipment for performance tests is listed at the beginning of each test procedure Other equipment can be used if it meets the critical specifications listed in thetable of service test equipment in chapter 1 However the procedure is based on the recommended model or part number Note The listed 75 ohm equipment is only required for an HP 8711 with option 1EC 75 ohm 9 impedance 2 2 Performance Tests Analyzer Calibration Cycle Analyzer calibration consists of performing the Operator s Check and all of the performance tests This should be done at least once per year If spurious signal levels are not critical for the analyzer applications used you can perform a limited calibration by omitting the spurious signals test This eliminates the need of a spectrum analyzer for calibration Performance Tests 2 3 HP 8711A SYSTEM SPECIFICATIONS Specifications describe the Instrument s warranted performance over the temperature range of 25 5 C Broadband mode characteristics apply from 10 to 1300 MHz Narrowband mode characteristics apply from 300 kHz to 1300 MHz Source Characteristics Frequency Range 300 kHz to 1300 MHz Resolution 1Hz Accuracy synthesized 5ppm RF output power Leveled range Standard to 16 dBm 1000 MHz 0 to 13 dBm 1000 MHz Option 1EC 75 oh
89. ect a DIN keyboard Displays feedback on detected key presses HP IB Port Prompts user to disconnect HP IB cable Tests HP IB hardware Prompts user to connect a printer and then sends characters to the port 3 Test TTL Pass Fail Bit Prompts user to disconnect cable and then tests the hardware Test Prompts user to ground the bit and then tests the hardware 34 Test TTL User Bit Test Prompts user to disconnect cable and then tests the hardware Prompts user to ground the bit and then tests the hardware ADJUSTMENTS Adjustment tests generate correction constants CCs which compensate for the hardware performance of the analyzer Correction constants are stored in flash EPROM along with the firmware The data is copied to RAM during power up Running an adjustment test modifies the data in RAM but it does not alter the data in EPROM store the new CCs into EPROM you need to store the CCS to disk clear the EPROM by reloading the firmware recall the CCs from disk back into the RAM and then store the CCs into EPROM EE Centronics Port Prompts user to connect a printer and then sends characters to the port Refer to Chapter 3 Adjustments for details on how to perform these tests ms me m 10 Set Serial Number Not implemented serial numbers can only be set over HP IB 100 i 101 LO Power Sets a DAC that varies the receiver LO output from the source This ensures that the receiver mixers are getti
90. els when both channels are on Rel vs Abs y axis scale System bandwidth Narrowband vs broadband mode Make sure the span is not too narrow This may cause interpolation errors with the default or full band calibra tions Perform a user defined calibration at the desired frequency range Receiver Power Problems Check all cables and cable connections on the receiver board tighten if necessary If the problem is caused by a power hole try moving the cables and see if the power hole moves or disappears If it does you probably have a bad cable If the analyzer has a step attenuator and the problem is in the 0 dBm range only replace the step attenuator assembly Otherwise replace the receiver board Troubleshooting 4 17 Detailed Troubleshooting This section provides more detailed troubleshooting procedures for use in confirming problems or isolating fail ures to either functional blocks on the board or to the component level Many of the procedures require a service extender board part of the HP 8711 service took kit Half of the extender attaches to the backplane while the ribbon cables and second half of the extender allow you to plug a board into the backplane while it is on top of the analyzer Be sure to use an antistatic mat on top of the analyzer to prevent the board from shorting on the analyzer s cabinet Refer to the HP 8711 Schematic Package for component location diagrams schematics and parts lists
91. enuator M3x8 screws for step atn PCB 15 with step atten 08711 60105 08711 69105 08711 60070 08711 69070 08711 60038 1250 1842 2950 0054 2190 0068 08711 20027 08711 20026 08711 20040 08711 20033 08711 20032 08711 20034 08711 60051 08711 60053 8120 5524 08714 20036 08711 20085 0515 0372 Commercially available A5 receiver assy includes items 9 and 7 Reuse all other associated parts Figure 7 5 5 Receiver Assembly Replaceable Parts Replaceable Parts 7 9 How to Remove the Receiver Assembly Disconnect the power cord Disconnect any cables from the EXT DET X INPUT EXT DET Y INPUT and AUX INPUT rear panel BNC connectors Remove nuts and washers from BNC connectors Remove screw on bottom of instrument Remove the front panel details are in Figure 7 1B on page 7 3 Remove cables between A4 source and AS receiver board assemblies Withdraw the assembly from its cavity 7 10 Replaceable Parts A6 POWER SUPPLY inside power supply assembly new power supply assembly R E M3x8 machine screw Fuse 250V time lag Fan part of A6 assembly Commercially available Figure 7 6 A6 Power Supply Assembly Replaceable Parts How to Remove the Power Supply Assembly Disconnect the power cord Remove the front panel details are in Figure 7 1B on page 7 3 Remove the display enclosure details follow Figure 7 7 on page 7 12
92. er indicates that it detects a firmware disk and is about to install the new firmware Press BEGIN Step 3 Installing Correction Constants from Disk Note Note this step automatically recalls CCs from disk and stores the CCs in EPROM a Insert the correction constants disk into the internal disk drive b Press c When the CCs have been installed from disk cycle power Step 4 Loading Correction Constants from Disk a Insert the correction constants disk into the internal disk drive b Press srsrewornons into RAM the analyzer loads the CCs from disk Adjustments 3 31 Troubleshooting HP 8711A System Troubleshooting Start here to troubleshoot problems with the HP 8711 The goal of this section is to differentiate between HP 8711 system problems caused by the analyzer and problems caused by its peripherals General Notes 1 ALWAYS turn the instrument power off before removing or installing an assembly 2 If you need to disassemble the instrument be sure to work at an antistatic workstation and use a grounded wrist strap to prevent damage from electrostatic discharge ESD 3 For disassembly procedures see the Replaceable Parts chapter of this manual Some parts in the instru ment have sharp edges Work carefully to avoid injury 4 Before replacing an assembly inspect the board for obvious easy to fix defects Examples include bent pins on ICs no solder in holes around the edges of shields and
93. er reading in column b of Figure 2 19 on the calculation worksheet Repeat steps 7 and 8 for the other frequencies listed in Figure 2 19 Exchange the power sensor and cable connections to the power splitter Repeat steps 3 through 9 Record the marker readings in column c and power meter readings in column d on the calculation worksheet The receiver s frequency response is the average of the variations measured with each configuration Calcu late the value for each frequency using 0 5 a b c d and record the result in column e Record the maximum and minimum values of column on the test record card If the Instrument Fails the Test Check the power sensor power divider splitter and cable There is no adjustment for this characteristic Failures that are close to the typical values are acceptable Howev er if the measured values differ greatly from the typical values there may be a problem with the receiver board Refer to the Troubleshooting chapter of this manual Performance Tests 2 21 VERIFYING PERFORMANCE WITH AUTOMATED TESTS Software Revision A 01 00 This section of the performance tests contains instructions and setup diagrams for automated tests Automated tests require an HP 9000 series 200 300 desktop computer associated peripherals and the HP 8711 Perfor mance Test and Adjustment Programs disk This disk also contains performance test software for the HP 86200A and 85201A RF detectors which are a
94. er the input power configuration instructions provided in this manual If this product is to be energized via an autotransformer make sure the common terminal is connected to the neutral grounded side of the mains supply Any servicing adjustment maintenance or repair ofthis product must be performed only by qualified personnel SERVICING Adjustments described in this manual may be performed with power supplied to the product while protective covers are removed Energy available at many points may if contacted result in personal injury Capacitors inside this product may still be charged even when disconnected from their power source To avoid a fire hazard only fuses with the required current rating and of the specified type normal blow time delay etc are to be used for replacement Acoustic Noise Emission Geraeuschemission LpA 70 dB LpA 70 dB Operator position am Arbeitsplatz Normal operation normaler Betrieb per ISO 7779 nach DIN 45635 t 19 DECLARATION OF CONFORMITY according to ISO IEC Guide 22 and EN 45014 Manufacturer s Name Hewlett Packard Company Manufacturer s Address Network Measurements Division 1400 Fountaingrove Parkway Santa Rosa Califomia 95403 U S A declares that the product Product Name RF Network Analyzer Model Number HP 8711A Product Options All options conforms to the following Product Specifications Safety IEC 1010 EMC EN55011 Class A
95. fer to the Troubleshooting chapter Performance Tests 2 15 2 3 POWER RANGE AND FLATNESS PERFORMANCE TEST Use this procedure to test the power level range and flatness of the analyzer source You step the source over a series of CW frequencies at three different power levels Then you use the minimum and maximum specified power limits as two of these power levels to test the power range At each power level you determine the flatness from the peak to peak variation in power over the frequency range Since this test only checks a few points across the frequency range you also make a slow sweep to check for power holes The specifications the instru ment performance is tested against are listed below Power range specifications awe 88 eR Rae _ Sade ELIT Werin terii oenn EECC Ao H0dBm OwHOd _ Power flatness specifications standard 1 0 dB 2 dB peak to peak option 1EC 759 1 5 dB 3 dB peak to peak option 1E1 step attenuator for 500 and 759 2 0 dB 4 dB peak to peak To set up the equipment The list below shows the equipment you use in this test You can use any equipment that meets the critical speci fications listed in the table of service test equipment in chapter 1 However the procedure is based on the rec ommended models Warm up time is 1 hour Recommended Model or HP Part Number _______________ O oO 436A 43
96. ference reflected and transmitted signals These inputs are processed as either narrowband or broadband signals Then they are multiplexed into ADCS analog to digital converters where they are converted into digital signals The digital data is processed by the A2 CPU assembly and sent to the A7 display Theory of Operation 6 1 Be Reference Source x X Transmitted RF Out RF In Device Under Test Figure 6 1 Simplified HP 8711 System Block Diagram ANALYZER FUNCTIONAL GROUPS Each functional group consists of one or more assemblies that perform one of the basic instrument functions These groups are the power supply digital control source and receiver POWER SUPPLY THEORY The power supply group consists of the A6 power supply assembly This switching power supply provides regu lated DC voltages to power all assemblies in the analyzer through a connection to the backplane The backplane serves as a motherboard to provide power data and control signal connections to the various assemblies A voltage selector switch accessible at the rear panel adapts the analyzer to local line voltages of approximately 115V or 230V Refer to Installing the HP 8711 in the Operating and Programming manual for line voltage tolerances and other power considerations The power supply has a standby state instead of an off state when the AC power is connected In standby the assembly provides a 13V supply which is used to power t
97. fication check the time base accuracy of the counter If the Analyzer Fails the Test If the analyzer fails by a large margin at all frequencies especially if the deviation increases with frequency the master time base probably needs adjustment Refer to Frequency Accuracy Adjustment and Fractional N VCO Adjustment in the Adjustments chapter If the analyzer still fails the test refer to the Troubleshooting chapter 2 12 Performance Tests 2 2 DYNAMIC RANGE PERFORMANCE TEST Dynamic range is the difference between the receiver s maximum specified input level and the receiver s noise floor This test has two parts In the first part you check compression in narrowband mode to verify the receiver s accuracy at high input levels Broadband compression is tested in the Absolute Power Accuracy Performance Test In the second part you measure the receiver noise floor The specifications are listed below Standard 50 Q Opt 75Q Compression Narrowband 0 8 dB compression at 10 dBm 0 8 dB compression at 7 dBm Noise Floor Narrowband 300 kHz to 5 MHz 5 MHz to 1 3 GHz Broadband 47 dBm lt 77 dBm 47 dBm To set up the equipment The list below shows the equipment you use in this test You can use any equipment that meets the critical speci fications listed in the table of service test equipment in chapter 1 However the procedure is based on the rec om
98. he HP 8481D excluding the 30 dB attenuator to the REFLECTION port For 75 ohm option 1EC instruments Connect an HP 11852B minimum loss pad to the REFLECTION port before connecting the power sensor to complete the adjustment 10 For all instruments When the test is done disconnect the power sensor and press Then press 11 If you are NOT going to make any more adjustments continue with procedure titled To Permanently Store CCs in the Analyzer part of Storing and Recalling CCs at the end of this chapter 12 If you ARE going to make more adjustments save the correction constant data that you ve generated so far Insert a formatted disk into the internal disk drive Press SYSTEM OPTIONS This creates a file or writes over an existing file with the name CC_data Adjustments 3 19 In Case of Difficulty If the system locks up or the power meter does not respond to the analyzer make sure the HP IB cable is correct ly connected and the HP IB address on the power meter is set to 13 If a log error occurs on the power meter during the low power adjustment and the test stops you will need to do the test again Turn off the HP 8711 and preset the power meter If you did not store the correction constants to disk before starting this adjustment you need to repeat all of the adjustments done up to this point then repeat the source power correction If you did save the correction constants t
99. he correct value from 1 to 30 Note that the default HP IB address recognized by the HP 8711 for both printers and plotters is 5 but the factory default address of printer is 1 Make sure the printer or plotter has power turned on paper pens pinch wheels down and so forth Plotters should not be in VIEW mode Press o doa print or plot Ifthe result is nota copy of the display as selected by suspect HP IB problems in the analyzer HP IB Problems with Disk Drives For disk drives press SAVE RECALL S4 volume numbers Default values for all three zero and set the correct address disk unit and disk to select the external disk drive The second line should begin with EXT to store a file to the disk If this is not succesful suspect HP IB problems in the Troubleshooting 4 3 General Checks for HP IB Systems Make sure the controller is compatible HP 9000 series 200 300 with HP IB and I O binaries loaded Some PCs with GP IB interface cards may also be compatible Make sure the controller is using the proper select code and addresses Besure HP IB cable length limits are not exceeded See Installing the HP 8711 in the Operating and Program ming manual Refer to the HP IB Programming chapter of the Operating and Programming manual to troubleshoot pro gramming problems Replace the CPU board or referto the HP 8711 Schematic Package to troubleshoot further if the analyzer appear
100. he far right 4 Connect a 30 dB attenuator and another SMA cable between the source A4J4 and receiver A573 as shown in Figure 3 8 3 14 Adjustments 10 11 12 Type N Cable Figure 3 8 Setup for Switched Gain Correction Connect a type N cable between the REFLECTION and TRANSMISSION ports as shown in Figure 3 8 top softkey The analyzer adjusts switched gain for the B and R inputs When the prompt appears in the dialogue box disconnect the type N cable between the REFLECTION and TRANSMISSION ports Press top softkey The analyzer adjusts switched gain for the A input If the analyzer fails the adjustment test resulting in a warning message check the cable setup and rerun the test After the test is done remove the 30 dB attenuator and put the original SMA cable back The analyzer presets after the test is done Reassembie the front panel and handles If youare NOT going to make any more adjustments finish with the procedure titled To Permanently Store CCs in the Analyzer part of Storing and Recalling CCs at the end of this chapter If you ARE going to make more adjustments save the correction constant data that you ve generated Insert a formatted disk into the internal disk drive Press This creates a file or writes over an existing file with the name data Adjustments 3 15 EXTERNAL DETECTOR CORRECTION ADJUSTMENT This procedure shows you ho
101. he non volatile SRAM on the CPU board A battery provides power to the non volatile SRAM when the instrument is disconnected from AC power The power supply turns on when the on standby switch is grounded In the on state the power supply provides the following supplies to the instrument 5V 15 5V 15 5V and 12V Two diagnostic LEDs are visible from the rear panel The green LED is on in normal operation It is off when the line power is absent or set too low or if the line fuse has blown The red LED is on in standby but off during normal operation It will blink to indicate a power supply shutdown Refer to the Troubleshooting section for more details 6 2 Theory of Operation DIGITAL CONTROL THEORY This group includes the A1 front panel A2 CPU A7 display and A8 floppy disk drive assemblies A1 Front Panel The A1 front panel assembly allows the user to control the analyzer It includes a keyboard and RPG knob A probe power jack that supplies 15V and 12 6V is available for use with RF probes and other accessories Fuses for these supplies are on the back of the A1 front panel PC board A2 CPU The A2 CPU assembly provides most of the control interface and data processing functions in the analyzer It contains several microprocessors and many different types of memory as shown on the HP 8711 overall block diagram The main CPU is an MC 68020 microprocessor It is the master controller for the analyzer including the other
102. he program asks if you want to change the report header includes information on the technician s name date of test temperature and humidity conditions Follow the prompts to update this information if necessary 5 Using the cursor keys move the arrow pointer to B Amplitude Adjustment and press 6 Enter the calibration factor at 30 MHz for the two power sensors you are using for the adjustment 7 Choose the power meter input port where you connected the power sensor and press A if you have an HP 438A 8 Connect the HP 8481D power sensor and the 30 dB reference attenuator part of the HP 8481D shipment to the POWER REF port on the power meter and press any key to continue Follow the prompts to zero and calibrate the power meter 9 Connect the power sensor to the power divider or minimum loss pad for 75 2 systems excluding the 30 dB reference attenuator and press any key to continue The controller uses the power meter to set HP 8711 power levels accurately then signals the analyzer when the level is correct The analyzer then reads the power measured and calculates the appropriate correction constants The power level being set and the power level error of each iteration is displayed on the controller Screen The HP 8481D power sensor is used at low power levels At higher power levels the program prompts you to connect either an HP 8482A or HP 84834 For 75 ohm systems remove the minimum loss pad from the power
103. iary input correction Corrects for offset and gain of the aux input ciruitry aux input circuitry SERVICE MODES SUMMARY Theservice modes menus are shown in Figure 5 2 and described in the following paragraphs The service modes Service Key Menus 5 5 Service Utilities More Svc Utilities ALC DAC Set Attenuator IF Goin AUTO mon IF Goin Lo on OFF IF Goin Hi on OFF LO Power Adjust Re Chan DAC Be Chan DAC SYSTEM OPTION _ interno Diognostics on Adjustments Tests ond Adjustmts instrument Info Service Utilities Meus Col Options Update Corr Const Analog Bus More Svc Utilities Prior Menu IBASIC Prior Menu Service Functions HP 1B Meas Cal Options View Array Moster Operating Porameters System Config ON off Detect Co ON off Directivty Source Motch Prior Menu Tracking Service View Arroy Moster Narrowbond Response View Arroy Interpol Re Freq Response Analog Bus Select Node Sampie Prior Menu Prior Menu Update Corr Const View Array Interpol Instali CC From Disk Directivty Source Motch Help Messogs Trocking Prior Menu Norrowbond Response Lood CC From Disk Store CC To Disk Store CC To Eprom Re Freq Response Prior Menu Prior Menu 50640 Figure 5 2 Service Functions Menus INSTRUMENT INFO Displays a window with the following information Instrument model
104. ies and miscellaneous parts part num bers and ordering information It also contains part removal procedures e 8 Instrument History contains backdating information required to make this manual compatible with earlier shipment configurations of the instrument Overview and Preventive Maintenance 1 1 PREVENTIVE MAINTENANCE Preventive maintenance consists of two tasks It should be performed at least every six months more often if the instrument is used daily on a production line or in a harsh environment Clean the CRT Use a soft cloth and if necessary a mild cleaning solution HP part number 8500 2163 is one such solution Check the RF Front Panel Connectors Visually inspect the front panel connectors The most important connectors are those to which the DUT is con nected typically the RF cable end or the RF IN connector All connectors should be clean and the center pins centered The fingers of female connectors should be unbroken and uniform in appearance If you are unsure whether the connectors are good gage the RF IN and RF OUT connectors to confirm that their dimensions are correct Mating plane Max 0 207 in Min 0 204 in Figure 1 1 Maximum and Minimum Recession of Center Conductor Line Fuse Replacement The line fuse does NOT need to be replaced periodically only when it fails The line module on the rear panel contains a spare fuse To order additional fuses use the part number listed on the rear panel a
105. ies to access registers on the chip 19 Floppy Disk Controller Tests the floppy disk controller chip Tries to access registers on the chip Writes commands to the chip and verifies correct response Also steps the floppy disk drive s head from track O to 9 and back to 0 to test the ability to find track 0 HP IB Interface Tests the HP IB interface circuitry Tries to access registers on the chip Writes commands to the chip and verifies correct response 21 RS 232 Interface Tests the RS 232 DUART chip Tries to access registers on the chip Checks for missing clock input to the chip DIN Keyboard Interface Tests the DIN keyboard control processor Tries to access registers on the chip Centronics Interface Tests the Centronics interface circuitry Writes to three main printer control output lines and reads them back Test runs during power up Service Key Menus 5 3 24 Front Panel Key 3 Prompts user to press any keys and displays information on the key pressed Press PREsET three times to exit 25 Erase Non Volatile Tests all locations of battery backed SRAM by writing zeroes SRAM This erases existing data Source PLL Lock Not implemented X External Detector ID Not implemented Y External Detector ID Not implemented 27 28 29 RS 232 Port Prompts user to connect a printer or terminal and then sends characters to the port 30 31 32 3 DIN Keyboard Port Prompts user to conn
106. in scientific notation refer to different types of numeric data CHAR character data and STRING string data enclosed in quotes are also used to describe response types These parameter types are described in the Parameter Types section of the HP IB Command Reference in the HP 8711A Operating and Programming Manual ___ Fem Dempim DIAGnostic CCONstants LOAD Load correction constants from internal disk drive DIAGoostic CCONstants STORe DISK Command Store correction constant data to a file named CC_data on the internal disk drive DIAGnostic CCONstants STORe EEPRom Command Store correction constant data from the RAM buffer into flash EPROM DIAGnostic CPU MEMory 0 1 Write a 16 bit data value to 68020 address Query returns an addr num data num integer with the 16 bit value at the selected address DIAGnostic SNUMber lt string gt G Store a serial number into memory The string must be 10 characters long The query form returns the current serial number IDN Query G OPT Query Return a string identifying the installed options in the form STRING E1 1C2 SENSe 1 2 CORRection STATe NR1 Turn measurement calibration on off ON 1JOFHo TEST RESult Query Query the result of the selected adjustment or self test Response CHAR will be NULLIPASS FAIL 1 CHAR Return a string that uniquely identifies the analyzer including model number serial num
107. ing the handle plate on the ritght side Frac N board Front panel assembly ribbon cable Handle plate screws Trim sti on each handle SONS d handles on each handle Figure 3 1 Removing the Handles and Front Panel Adjustments 3 3 2 setup the service extender board for adjusting the frac N board follow these steps Remove the backplane cover from the rear panel of the analyzer by lifting up on the tab and sliding the Cover toward the power cord receptacle b Attach the service extender board by reversing step a with the lower extender board assembly C Place an antistatic mat on top of the analyzer d Remove the two SMB cables from the frac N reference assembly Remove the nut on the rear panel EXT REF BNC connector Use the handle to pull the board assembly out of the analyzer Attach the frac N reference assembly back plane connector to the upper extender board f Reconnect the SMB cables 3 Switch on the analyzer power Press 4 Measure the voltage at TP11 on the frac N board see Figure 3 2 for the location VCO ADJ TP11 L162 Figure 3 2 TP11 and L162 for Frac N VCO Adjustment 5 Use anonconductive tool to adjust L162 see Figure 3 2 until TP11 reads 1 17 0 03 volts Remove the adjustment tool and check that the voltage doesn t change 6 If you ARE going to make the frac N spur adjustment continue to that procedure without changing the equipment setup If you ARE N
108. ing the power supply to shut down This may be caused by the other boards having bad contact with the backplane Give each board a push to make sure it is all the way in If the problem persists remove the assemblies one at a time and note which one is the cause of the shutdown Refer to the Replaceable Parts chapter of this manual for disassembly instructions Note It s possible for the flexible metal fingers or a backplane connector pin to break off and cause g a short so check for loose pieces of metal Suggested order for board removal easiest to hardest A1 front panel e A7 display remove the ribbon cable while it s outside the analyzer reinstall and see if the power supply is still shut down If A7 appears to be causing shutdown open the display enclosure cover see Figure 7 7 in Replaceable Parts and make sure the PC board is firmly seated e disk drive frac N reference 4 source e AS receiver 2 TROUBLESHOOTING DIGITAL GROUP PROBLEMS This group includes the CPU display disk drive and front panel The frac N reference assembly is also needed to provide a 5 MHz reference for the digital signal processor DSP on the CPU board Remove the disk if any from the internal disk drive Turn on the analyzer and watch for the proper turn on sequence 1 Disk drive light goes on briefly and a beep is audible from the CPU 2 The CRT lists the boot ROM self tests being
109. interest The user can also select In this case the analyzer will approach a known spur frequency switch dither on until it sweeps past the spur then switch dither off again until it gets to the next spur This method is more suitable for wider frequency spans but it slows down the sweep because of the need to turn dither on and off Theory of Operation 6 5 RECEIVER THEORY The AS receiver assembly is responsible for separating and measuring the RF signals and converting these sig nals into digital data for further processing by the A2 CPU Figure 6 3 shows a simplified block diagram of the receiver assembly Step Attenuator Opt wey p X R A 2 Xx puting from M es E D Transmission B External Detector iv LI iy Figure 6 3 Simplified Receiver Block Diagram The source RF output from the A4 source assembly is input into the receiver The signal passes through an op tional step attenuator then through two directional couplers The first coupler measures the source output signal and uses this as a reference R input The source output signal travels the through arm of the second coupler which is used in reflection measurements to sample the signal reflected from the REFLECTION test port This reflected signal is referred to as the A input The source output signal then goes out the REFLECTION port propagates through the device under test and enters the
110. ion Constants from Disk Adjustments 3 29 To Restore Previous CCs after Replacing the A2 CPU Board Perform and check step 2 below skip this step if A2 was supplied with firmware already installed Set Serial Number Adjustment earlier in this chapter step 3 below Installing Correction Constants To Replace Suspected Incorrect CCs Perform and check step 2 below Updating or Restoring Firmware step 3 below Installing Correction Constants To Archive Current CCs to Disk Perform and check cycle power to clear any temporary CCs in RAM Step 1 below Storing Correction Constants to Disk If ROM Appears to be Blank Message is Displayed at Power up Perform and check step 2 below Updating or Restoring Firmware step 3 below Installing Correction Constants from Disk If Warning No Correction Constants Installed Is Displayed at Power UP Perform and check step 3 below Installing Correction Constants from Disk Step 1 Storing Correction Constants to Disk a Insert a formatted disk into the internal disk drive Note Do not use the correction constants disk shipped with the analyzer unless you are certain that the data on it is no longer needed b Press a file named CC data The instrument writes or overwrites 3 30 Adjustments Step 2 Updating or Restoring Firmware a Insert the firmware disk and cycle power the analyz
111. is not a warranted specification failures where the measured value exceeds the typical values by a small amount are acceptable The performance may be improved by performing the B Amplitude Correction see the Adjustments section of this manual If the power accuracy is much worse than typical and it cannot be adjusted there may be a problem with the receiver Refer to the Troubleshooting section of this manual 2 44 Performance Tests 2 8 SYSTEM DIRECTIVITY AND PORT MATCH AUTOMATED PERFORMANCE TEST Directivity is a measure of a system s ability to separate the incident and reflected signals You can examine directivity by measuring a calibration kit load The load has a much better return loss than the system s receiver does so any power detected from this measurement is assumed to be due to directivity error Port match indicates the impedance match of the test port You can determine transmission port match by making areflection measurement when a cable is connected between the reflection and transmission ports You can de termine source match at the reflection port from reflection measurements of an open short and load The HP 8711 specifications for system directivity and port match apply after you have done a reflection calibra tion The performance of an error corrected system depends primarily on the quality of the calibration standards connector repeatability system dynamic accuracy and system noise and stability Since er
112. justment you should store a copy of the correction constants in a disk file for later retrieval if you haven t done so already Refer to the procedure in Storing and Recal ling Correction Constants 3 18 Adjustments 1 Switch on the power meter and let it warm up for at least five minutes 2 Connect an HP IB cable between the HP 8711 and the power meter Set the HP IB address of the power meter to 13 Disconnect any controller that may be on the HP IB bus 3 Connect the HP 8482A power sensor to the power meter If you are using an HP 438A connect the input to the A port Zero and calibrate the power meter using the instructions in the power meter manual 4 Press REET eme 5 When prompted connect the 10 dB attenuator and power sensor to the REFLECTION port For 75 ohm instruments use the minimum loss pad instead of the attenuator Press directly to the REFLECTION port Press 7 If your instrument DOES NOT have a step attenuator go to step 10 8 Forallinstruments with a step attenuator option 1E1 When prompted disconnect the HP 8482A pow er sensor from the power meter and connect the HP 8481D option H70 Preset the power meter Connect the calibrated HP 11708A 30 dB attenuator part of the IMPORTANT HP 8481D sensor shipment to the POWER REF output of the power meter Connect the HP 8481D option H70 to the HP 11708A then zero and calibrate the power sensor 9 For 50 ohm instruments Connect t
113. lay enclosure from the instrument Hold the switch cover item 4 Figure 7 7 by the top and bottom edges push back slightly to release the tabs and rotate outward and toward the back to remove Both switches and cables must be replaced as a unit Replaceable Parts 7 13 A8 FLOPPY DISK DRIVE Floppy disk drive inc sheet metal Bracket mounting to disk drive Disk drive 3 wire cable not shown Screws for sheet metal not shown Figure 7 8 Floppy Disk Drive Replaceable Parts How to Remove the Disk Drive Assembly Disconnect the power cord Remove the front panel details follow Figure 7 1B on page 7 3 Press up on the middle tab item A Figure 7 8 on page 7 14 on the underside of the drive to release the drive Withdraw the drive from the cavity just enough to disconnect the 3 wire cable and the ribbon cable at the drive Toreplace the disk drive assembly if the 3 wire cable disconnects from the A1 assembly within the cabinet rath er than the disk drive follow these tips Stand the analyzer up on its rear panel after disconnecting cables as required Straighten the 3 wire cable Maneuver the cable jack into position above the socket on the A1 assembly Note the orientation of the jack Use a long flat blade screwdriver to press the jack into its socket As an alternative remove the display enclosure and the A1 CPU assembly 7 14 Replaceable Parts CABINET AND MISCELLANEOUS PARTS CABINET PARTS Power c
114. lso an external trigger input for sweep control The firmware for the analyzer is stored in two places A boot ROM contains low level firmware that allows the analyzer to run some power on self tests and perform functions such as loading firmware from a floppy disk The main firmware which includes the analyzer s operating system and additional self tests is stored in EPROMs along with the correction constant data for the instrument Both the boot ROM and the main 5 are flash EPROMs They can be erased and reprogrammed without removing the CPU assembly from the ana lyzer However erasing the EPROMs for a firmware update also erases the correction constant data so it is nec essary to have a copy of this data on disk for retrieval after the update The non volatile SRAM is used to store instrument state and peripheral state settings It is also used as a RAM disk by the save recall functions which refer to the non volatile SRAM as internal memory This non volatile SRAM is powered by 13V supply when the analyzer is in standby and by a battery when the AC power is disconnected The CPUassembly also contains SIMM DRAM The amount of SIMM DRAM installed in a particular HP 8711 depends on the instrument s option configuration This SIMM DRAM is used in addition to the main DRAM for normal operation of the CPU More SIMM DRAM is required for instruments with IBASIC option 1C2 Theory of Operation 6 3 A7 Display The A7 display
115. lter and compare the results to typical plots To set up the equipment The list below shows the equipment you use to check the operation of the analyzer 1 2 759hm ptiEO _ Ass p C Note The filter listed was shipped with your HP 8711 but any other filter can be used if its passband is between 300 kHz and 1 3 GHz However if another filter is used the typical plots given will not apply HP 8711A Notwork Analyzer s EE 8 B88 p 9 Figure 2 2 Equipment Setup for Checking Instrument Operation Connect the equipment as shown in Figure 2 2 Press on the analyzer To check analyzer operation in transmission mode 3 Press to put the analyzer in a mode to measure the transmission of a filter Performance Tests 2 7 4 Press to set the analyzer for a center frequency of 177 MHz and a span of 300 MHz 5 Press 5 to measure the filter Note if you are not using the filter supplied with the instrument your displayed measurement may look different Compare the displayed measurement to the plot shown in Figure 2 3a Chan 1 Transmisaion Log Mag 20 0 dB Ref 60 00 dB P chan 1 Reflection Log Mag 5 0 dB Ref 0 00 dB Chan 2 0ff ELT cuu i RS 4 AVI BEP ES Center 177 000 MHz Span 300 000 MHz Center 177 00 MHz Span 300 00 MHz a Transmission Measurement b Reflection Measurement Figure 2 3
116. ly R E J1 receiver LO SMA connector J2 frac N input SMB connector JS 10 MHz reference input SMB connector Rear shield top Rear shield bottom Rear shield gasket MS3Sx12 machine screws Commercially available Ao Figure 7 4 Source Assembly Replaceable Parts How to Remove the Source Assembly Disconnect the power cord Remove backplane cover by pressing upwards on tab at top see disassembly label Remove rear panel screw Remove the front panel details are in Figure 7 1B on page 7 3 Disconnect the four cables from the front of the source assembly Withdraw the source assembly from its cavity 7 8 Replaceable Parts A5 RECEIVER ASSEMBLY 5 50 ohm receiver assembly new A5 50 ohm receiver assembly R E A5 75 ohm receiver assembly new A5 75 ohm receiver assembly R E Test port assy connectors and bracket Aux input BNC connector Hex nut for BNC connector Washer for BNC connector Square shield top Square shield bottom Square shield gasket RF IN connector to J4 cable assy Not used J2 to RF OUT cable PARTS SPECIFIC TO INSTRUMENTS WITHOUT STEP ATTENUATOR Source RF to JS cable assy not shown PARTS SPECIFIC TO INSTRUMENTS WITH OPTIONAL STEP ATTENUATOR Step attenuator assy inc atm amp PCB Step attn PCB part of item 11 Step attenuator ribbon cable assy JS to step attenuator cable assy Step atin to front panel cable assy Screws to fasten step att
117. m 0 to 13 dBm lt 1000 MHz 0 to 10 dBm gt 1000 MHz Option 1E1 60 dB step attenuator reduces maximum RF output power by 3 dB Power Flatness test port Standard 1 0 dB Option 1EC 75 ohm 1 5 dB Option 1E1 step attenuator 2 0 dB Option 1EC with 1E1 2 0 dB Signal purity Harmonics lt 20 dBc lt 1 MHz lt 30 dBc 1 MHz Receiver Characteristics Dynamic range Standard Narrowband mode gt 60 dB 10 to lt 50 dBm lt 5MHz gt 90 dB 10 to lt 80 dBm gt 5 MHz Broadband mode gt 66 dB 16 dBm to 50 dBm Option 1EC 75 ohm Narrowband mode gt 54 dB 7 to 47 dBm x 5 MHz gt 84 dB 47 to 77 dBm 5 MHz Broadband mode gt 63 dB 16 dBm to 47 dBm Maximum input level Narrowband mode 10 dBm 0 8 dB compression Broadband mode 16 dBm 0 55 dB compression Test Set Characteristics Reflection Measurements Test Port Match 20 dB System Directivity 40 dB Dynamic Accuracy Narrowband Dynamic accuracy is the receiver s accuracy versus input power level 16 RE Heasureumant Level dB from REF lt gt 399 45 1 Reouracy dB Figure 2 1 HP 8711 Specifications and Supplemental Operating Characteristics 1 of 2 2 4 Performance Tests SUPPLEMENTAL OPERATING CHARACTERISTICS Supplemental operating characteristics are typical but non warranted performance characteristics They are repre sentative of most instruments but not
118. maintenance agreements and other customer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are provided at the back of this manual BP24A 2 SAFETY CONSIDERATIONS GENERAL This product and related documentation must be reviewed for familiarization with safety markings and instructions before operation This product has been designed and tested in accordance with international standards SAFETY SYMBOLS instruction manual symbol the product will be marked with this symbol when it is necessary to refer to the instruction manual refer to Table of Contents Indicates hazardous voltages Indicates earth ground terminal The WARNING sign denotes a hazard It calls attention to a procedure practice or the like which if not correctly performed or adheredto could result in personal injury Do not proceed beyond a WARNING sign until the indicated conditions are fully understood and met The CAUTION sign denotes hazard It calis attention to an operating procedure practice orthelike which if not correctly performed or adhered to could result in damage to or destruction of part or all of the product Do not proceed beyond a CAUTION sign until the indicated conditions are fully understood and met BEFORE APPLYING POWER Verify that the product is configured to match the available main power source p
119. mended models Warm up time is 1 hour im 2 Ohm opt _ Recommended Model or HP Part Number 1 Attenuator must have calibration data report for frequencies measured To obtain attenuator calibration data send attenuator to a calibration lab To Measure Compression 1 Enter the data values for the calibrated 20 dB attenuator as POSITIVE numbers in column a of Figure 2 16 Data at frequencies other than those listed in the table may be substituted providing they are a good selection of data points over the full frequency span of the HP 8711 If you do use data for other frequencies that are not listed write the actual frequencies for the data in Figure 2 16 Performance Tests 2 13 2 Connecta thru cable between the REFLECTION and TRANSMISSION ports of the analyzer For 50Q analyzers press For 75Q analyzers press Co 3 Connectthe attenuator between the two ports of the analyzer Press and enter the first frequency listed in Figure 2 16 Record the marker reading in column b of Figure 2 16 4 Enter the next frequency listed in Figure 2 16 and record the marker reading in column b Repeat for frequencies listed 5 Calculate the values for column c by adding the values of a and b Record the worst case value of col umn c in the Performance Test Record To Measure Noise Floor 1 Connecta thru cable between the REFLECTION and TRANSMISSION ports of the analyzer
120. ment that meets the critical specifica tions listed in the table of service test equipment in chapter 1 However the procedure is based on the recom mended model or part number Warm up time is 1 hour i ooe with BASIC 5 0 or higher _ Tinker ner _________ Performance Tests 2 31 Controlloer Disk Drive Spectrum Analyzer EL EX ThinkJet Printer n EHE HP IB Address 700 HP IB Address 701 HP 8711A Network Analyzer 0 Minimum Loss Pad for 750 analyzers only Li Figure 2 10 Signal Purity Test Setup 1 Connect the equipment as shown in Figure 2 10 2 Press on the analyzer To check the spurious signals 1 If you haven t already done so load the test software by following the procedure in Loading and Running the Test Software located earlier in this section 2 Select Spurious Signals from the performance tests main menu 3 Select ALL TESTS press and then any key to continue As the software program runs the test results are saved in the controller RAM for a print out 4 When the tests are completed the PASS FAIL results are displayed on the controller screen 5 Press to return to the performance tests menu 6 If you are not going to make anymore performance tests print the test results to either the screen or t
121. n Figure 2 17 Note some instruments output less than 13 dBm at 1 3 GHZ see Figure 2 18 Write the maximum and minimum power values on the calculation worksheet in Figure 2 18 Calculate the test result by subtracting the minimum value from the maximum value Write the maximum and minimum values and the test result on the test record Performance Tests 2 17 5 Repeat steps 1 through 4 for the power level settings through 0 dBm in Figure 2 17 If your analyzer does NOT have option 1E1 step attenuator continue with To check power holes later in this procedure If your analyzer DOES have option 1E1 continue with either the 50 or 75 ohm step below For 50 ohm Instruments with Step Attenuators option 1 1 6 Removethe HP 8482A power sensor and replace it with an HP 8481D option H70 Zero and calibrate the power meter Calibrate the power sensor with the 30 dB reference attenuator connected to the power meter Set the power level of the anlyzer to 20 dBm Connect the sensor directly to the analyzer do not use the reference attenu ator 7 Repeat steps 1 through 4 for power level settings of 20 dBm and 60 dBm For 75 ohm Instruments with Step Attenuators option 1E1 8 Repeat steps 1 through 4 at a power level setting of 20 dBm 9 Remove the HP 8483A power sensor and replace it with an HP 8481D Zero and calibrate the the power meter Calibrate the power sensor with the 30 dB reference attenuator connected to the po
122. nd in Figure 7 6 of the Replaceable Parts chapter of this manual 1 2 Overview and Preventive Maintenance SERVICE TEST EQUIPMENT Figure 1 2 HP 8711A Service Test Equipment 1 of 2 U AT Spectrum Frequency Counter Freq 300 kHz to1 3 GHz HP 5342A Accuracy 1 ppm Power Sensors 50 ohm Freq 300 kHzto 1 3 GHz Power range 30 to 20 dBm Freq 300 kHz 1 3 GHz Power range 30 to 20 dBm Impedance 755 required for option 1EC instruments only Freq 300 kHz to 1 3 GHz HP 8481D option H70 Power range 70 to 20 dBm with 11708A M 7 calibration data at 30 MHz FuwionGewmo _____ _______ ______ RA PA 20 dB Type N Attenuator Need calibration data at 6 or HP 8491A option 020 more frequencies from 300 kHz to 1 3 GHz Impedance 75 ohms 0955 0670 30 dB SMA Attenuator SWR 1 2 HP 8493A option 030 Attenuator accuracy 1 0 dB P 30 MHz Bandpass Filter Center frequency 30 MHz 9135 0475 75 ohm Low power 3 dB BW lt 5 MHz 70 dB rejection below 20 MHz and above 40 MHz 10 dB Type N Attenuator SWR 1 2 HP 8491A option 010 Power Divider SWR 1 25 HP 11636A PAT Output tracking between arms 0 4 dB Max input power 30 dBm
123. necessarily tested in each They can be used in applying the instrument Broadband mode characteristics apply from 10to 1300 MHz Narrowband mode characteristics apply from 300 kHz to 1300 MHz Source Supplemental Characteristics System Accuracy Frequency Transmission accuracy Aging lt 3 ppm 1st year 1 ppm year thereafter Drift With temperature 0 to 55 C 5 ppm With 1096 change in line voltage 1 Hz With 3 1 load SWR 1Hz External reference Input 10 MHz BNC 2 5 dBm required Signal Purity Non Harmonic Spurlous gt 50 kHz from carrier lt 20 dBc 1 MHz lt 30 dBc gt 1 MHz lt 50 kHz from carrier lt 25 dBc 300 kHz to 1300 MHz Phase noise 70 dBc Hz at 10 kHz offset Residual AM 50 dBc in 100 kHz bandwidth Residual FM 1 5 kHz 30 Hz to 15 kHz post detection bandwidth Sweep time at maximum system bandwidth y eb E Unoertatnt Reflection accuracy Uncertainty CHinear 4 1 Reflection Coefficient Das Sweep Time Absolute power accuracy broadband 51 50 ms Total power accuracy absolute power 101 60 ms accuracy frequency response 0 5 dB 201 70 ms 401 110 ms 801 210 ms 1601 400 ms Maximum Error dB Receiver Supplemental Characteristics Input damage level 20 dBm 25 VDC Noise reduction techniques Averaging system bandwidth reduction Test Set Characteristics System Directivity with default calibrati
124. ng the correct 103 i power level PT Sets the low and high gain corrections for the receiver which are needed for accuracy at low input power levels 5 4 Service Key Menus The external X and Y detectors convert the detected power level into a voltage for the HP 8711 receiver In this adjustment known voltages are applied to the detector input ports The ana lyzer then generates correction constants for the receiver to use in interpreting the detector voltage level me Cmams _______ 104 ALC Correction Source power correction Generates power correction arrays for both the ALC and step attenuator if installed 105 B Ch Abs B amplitude correction Corrects B narrowband input so that it reads 0 dBm properly 106 B R Vector Transmission correction Performs transmission cal to correct B R to read 0 dB 107 One Port Reflection correction Performs one port cal to correct for nar rowband reflection A R measurements 108 R Scalar Pow R amplitude correction Generates absolute power lookup table for the R input at 30 MHz B amplitude correction Generates absolute power correction table for the broadband B input at 30 MHz The B input pow er is varied from 54 to 18 dBm in 2 dB steps for this test An external controller is required to run this test R frequency response correction Generates frequency re sponse correction for the broadband R input Auxill
125. nsor on CPU board CPU TEMP on the sche matic Typical values are 30 to 60 degrees Celsius this will depend partly on the ambient temperature CPU Temp 5 10 Service Key Menus MISCELLANEOUS SERVICE FUNCTIONS Clearing Nonvolatile Memory SRAM This is also referred to as zeroing the nonvolatile SRAM because the procedure causes the analyzer to write zeroes into the nonvolatile SRAM locations in memory Note that this will erase any files saved to internal memory RAM disk To clear the memory turn on the HP 8711 While the instrument is running through its self tests press the key a few times The analyzer will finish the main CPU tests then pause with a message asking if the user wants to zero the SRAM Press the key to clear the memory Press softkey 8 bottom softkey if you want to continue without clearing the memory Correction Constant Procedures Refer to Storing and Recalling Correction Constants in Chapter 3 Adjustments to perform these tasks store correction constants to disk or EPROM To load correction constants to RAM from disk Service Key Menus 5 11 Upgrading Firmware upgrade your analyzer s firmware you need two disks a firmware disk a correction constant CC disk Both disks are necessary because Correction constants are stored in EPROM with firmware The old firmware must be erased before the new firmware is stored and EPROM can onl
126. o a printer Refer to Printing Performance Test Results earlier in this section 2 32 Performance Tests If the Analyzer Fails the Test If the analyzer fails the test suspect the fractional N reference assembly or the source assembly Non harmonic spur performance is not a warranted specification so failures are acceptable where the measured value exceeds the typical values by a small amount Spur performance may be improved by performing the Fractional N VCO Adjustment and Fractional N Spur Adjustment If the harmonic test fails or the non harmonic spurs are much worse than typical refer to the Troubleshooting chapter Performance Tests 2 33 2 6 DYNAMIC ACCURACY AUTOMATED PERFORMANCE TEST Use this procedure to test the receiver s ability to measure signals as they vary in amplitude over the specified dynamic range The power is varied from 10 to 80 dBm by inserting a step attenuator with known attenuation values in the receiver path At the beginning of the test a reference is set at 20 dBm This provides a repeatabil ity check when the 20 dBm input level is actually tested Since the receiver performance is being measured against the step attenuator the actual attenuation values must be known You can obtain an HP 8496A G with calibrated data at 30 MHz by ordering the HP 8496A G option H17 This attenuator also meets requirements for use in performance tests for the HP 8752 and 8753 network analyzers If
127. o disk recall the correction constants data from disk as described in Storing and Recalling Correction Constants then go back to step 1 to repeat this test 3 20 Adjustments B AMPLITUDE CORRECTION ADJUSTMENT This procedure shows you how to correct the B narrowband input so that it displays a flat O dB trace with an input of 0 dBm from the analyzer s internal source key during this adjustment the analyzer will abort the test Recommended Model or Part Number Equipment If you press the 1 50 ohm std 75 ohm opt 1EC Type N cable HP p n 8120 4781 HP p n 8120 2408 1 Connect a cable from the REFLECTION port to the TRANSMISSION port 2 Press svsrewoenows The analyzer averages a number of sweeps together taking about two minutes to com plete 3 Ifyouare NOT goingto make any more adjustments continue with procedure titled To Permanently Store CCs in the Analyzer part of Storing and Recalling CCs at the end of this chapter 4 Ifyou ARE goingto make adjustments save the correction constant data that you ve generated so far insert i i e internal disk drive Press SYSTEM OPTIONS i This creates a file or writes over an existing file with the name Adjustments 3 21 TRANSMISSION B R CORRECTION ADJUSTMENT This procedure shows you how to perform a transmission response calibration to correct for frequency response in narrowband B R measurements key during this adju
128. oblem persists go to Phase Lock Problems below Signal not steady i e appears unlocked or if the frequency doesn t change properly go to Phase Lock Problems If the signal appears okay but the power levels are incorrect go to Power Problems If spur prob lems are suspected go to Spurious Signals Otherwise proceed to the Receiver Troubleshooting Phase Lock Problems There are 3 phase lock loops on the source board RF1 RF2 and source LO As you can see from the overall block diagram the source LO is mixed with the RF1 signal to produce the source RF output It is also mixed with the RF2 signal to produce the receiver LO output Since both the RF1 and RF2 loops use the 10 MHz reference signal from the A3 frac N reference board verify that signal first Verify 10 MHz Reference remove the handles and front panel Connect an oscilloscope or frequency counter to A3J3 connector on the right to measure the 10 MHz output from the frac N reference board Note The 10 MHz signal is DC coupled although the DC offset is small A blocking capacitor is rec a ommended if you want to use a spectrum analyzer The signal should measure 10 MHz 50 Hz Signal correct continue with Verify Frac N Output below Troubleshooting 4 13 Signal present but not accurate perform the Frequency Accuracy Adjustment procedure in the Adjust ments section of this manual Nosignal found verify that
129. ocedure titled To Permanently Store CCs in the Analyzer part of Storing and Recalling CCs at the end of this chapter 9 9 Ifyou ARE going to make more adjustments save the correction constant data th Insert a formatted disk into the internal disk drive Press This creates a file or writes over an existing file with the CC data gt generated so far 3 16 Adjustments AUX IN CORRECTION ADJUSTMENT Firmware rev 2 00 and above This procedure shows you how to generate correction constants for the Aux Input The procedure measures two voltages to compute the offset and gain of the aux input circuitry key during this adjustment the analyzer stops the test Equipment Recommended Model or Part Number DC power supply Any Voltmeter Any BNC cable Any Adapter BNC m to clip leads Any 2 Connect the BNC cable to the aux input on the rear panel of the analyzer 3 Connect clip leads to BNC cable and apply a short by connecting the two clip leads together and press 4 At the prompt connect the clip leads to 10V power supply observe polarity 5 Monitor the power supply voltage with the voltmeter adjust it to 10V 0 005V press 6 Ifyouare NOT going to make any more adjustments finish with the procedure titled To Permanently Store CCs in the Analyzer part of Storing and Recalling Correction Constants at the end of this chapter 7 Ifyou ARE going to m
130. on 30 dB System Directivity with user calibration 40 dB Transmission Measurements gt 1 MHz Transmission Port Match 20 dB Reflection Port Match 14 dB Figure 2 1 HP 8711 Specifications and Supplemental Operating Characteristics 2 of 3 Performance Tests 2 5 Aux Input Characteristics Calibrated range 10V Accuracy 396 of reading 20 mV Damage Level 14 VDC when instrument is operating 1 These characteristics apply for an environmental temperature of 25 5 C with less than 1 deviation from the calibration temperature at a narrow system bandwidth with spur avoidance activated Reflection test characteristics apply at reflection test ports after a user defined reflection calibration 2 These measurement uncertainty curves utilize an RSS model for the contributions of random errors such as noise typical connector repeatabilities and a worst case model for the contributions of dynamic accuracy and residual systematic errors 3 The graphs shown for transmission measurements assume a well matched device and do not include errors due to device reflection effects 4 The graph for measurement uncertainty applies to a one port device Figure 2 1 HP 8711 Specifications and Supplemental Operating Characteristics 2 of 2 2 6 Performance Tests OPERATOR S CHECK Usethis procedure for an operational check of the analyzer You make transmission and reflection measurements on a bandpass fi
131. or Frac N Spur Adjustments Load and run the test software by following the procedure in Loading and Running the Test Software in the Performance Tests chapter of this manual Select Fractional N Adjustments from the performance tests main menu The program asks if you want to use the default test frequencies e Ifyoureply Y the program tests the fractional N VCO frequencies of 37 MHz 45 MHz and 56 MHz This is suitable in most cases e Ifyou reply you can enter any three frequencies between 30 MHz and 60 MHz This allows you to test specific frequencies where you may have found problems during the spurious signals adjustment For each API adjustment the program shows spurs three times once for each frac N VCO frequency To minimize the spur adjust the potentiometer shown in Figure 3 5 Adjustments 3 7 100 kHz API2 R107 R76 R74 R88 Figure 3 5 and 100 kHz Adjustments 9 After the API adjustment the program prompts you to adjust for the 100 kHz spur at a single frequency The controller displays a message telling you the adjustment is completed 10 Insert the frac N board back into the analyzer don t reassemble the instrument completely yet Run the API and 100 kHz spurs test part of the Spurious Signal performance test The spur performance of the fractional N board may change significantly when you reinstall the assembly in the analyzer If the perfor mance
132. or agreement and Buyer shall pay HP s round trip travel expenses In ail other areas products must be returned to a service facility designated by HP For products retumed to HP for warranty service Buyer shall prepay shipping charges to HP and HP shall pay ship ping charges to return the product to Buyer However Buyer shall pay all shipping charges duties and taxes for products returned to HP from another country HP warrants that its software and firmware designated by HP for use with an instrument will execute its programming instructions when properly installed on that instrument HP does not warrant that the operation of the instrument or software or firmware will be uninterrupted or error free LIMITATION OF WARRANTY The foregoing warranty shall not apply to defects resulting from improper or inadequate maintenance by Buyer Buyer supplied software or interfacing unauthorized modification or misuse operation outside of the environmental specifications for the product or improper site preparation or maintenance NO OTHER WARRANTY IS EXPRESSED OR IMPLIED HP SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OR MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE EXCLUSIVE REMEDIES THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES HP SHALL NOT BE LI ABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ASSISTANCE Product
133. ord varies by country consult your CE Front handle one two per instrument 5062 3800 Front handle trim 5001 0540 Screws for front handles 0515 0982 Foot requires foot pad below 08711 40005 Foot pad rubber for use with foot above 0403 0424 RFI spring strip 16 in cut as required 8160 0775 Rear panel connectors see appropriate board Backplane cover Disassembly label on bottom of instrument Rear pane label Cabinet color French Gray Fuse power supply See Fig 7 6 SOFTWARE Performance test program 08711 10009 IB example programs disks 08711 60016 Example programs disk LIF format part of 08711 60016 08711 10003 Example programs disk DOS format part of 08711 60016 08711 10005 IBASIC Example programs disk 08711 10006 ACCESSORIES 50 ohm 3 5 mm calibration kit HP 85033C opt 001 50 ohm type N calibration kit HP 85032B E 50 ohm 3 5 mm accessory kit HP 11878A 50 ohm type N accessory kit HP 11853A 50 ohm BNC accessory kit HP 11854A 50 ohm type N to TNC adapter kit HP 86212A 50 to 75 ohm minimum loss pad HP 11852B 75 ohm type N calibration kit HP 85036B E 75 ohm type N accessory kit HP 11855A 75 ohm type N to 75 ohm BNC assy kit 3 HP 11856A 75 ohm type N to type F adapter kit HP 86211A 24 inch BNC test port cable 50 ohm HP 8120 1839 50 ohm type N test port cable HP 8120 4781 75 ohm type N test port cable HP 8120 2408 1 0 meter HP IB cable HP 10833A 2 0 meter HP I
134. ormation This manual contains information required to maintain test troubleshoot and repair the analyzer The rest of this section consists of three main parts description of how this manual is organized preventive maintenance instructions and equipment and its critical specifications required to monitor or adjust the instrument ORGANIZATION OF SERVICE MANUAL Tabs divide the major sections of this manual The tab titles in italics and contents follow 1 Overview and Preventive Maintenance is described above 2 Performance Tests are step by step procedures that verify certain individual performance specifications of the analyzer 3 Adjustments provides instructions for adjustment and alignment of the instrument after repair or replace ment of an assembly Some of the adjustments are semi automated procedures for altering correction constants non mechanical adjustments 4 Troubleshooting contains an operator s check service procedures to identify bad assemblies and an over all block diagram 5 Service Key Menus documents the instrument functions accessed from the softkey These func tions include test adjustment control troubleshooting routines and upgrading firmware e Theory of Operation explains the overall operation of the instrument the division into functional groups and the operation of each group 7Replaceable Parts provides illustrations of the replaceable assembl
135. orrection 3 18 Switched Gain Correction 3 14 Transmission Correction 3 22 Adjustments Summary of 5 4 ALC DAC 5 7 Amplitude B Correction Adjustment S 21 Analog Bus Menu 5 9 Analog Bus Nodes 5 9 Analyzer Calibration Cycle 2 3 Automated Performance Tests 2 22 When to Perform 2 2 Automated System Addresses 2 24 Automated System Connections 2 23 Automated System Setup 2 22 Automated Test Software Loading and Running 2 27 AUX in Correction Adjustment 3 17 B Amplitude Correction Adjustment 3 21 B Amplitude Correction Adjustment 8 26 B Chan DAC 5 7 Backing Up the Software Program 2 25 BASIC Operating System 2 23 Binaries and Drivers 2 23 Broadband Frequency Response Performance Test 2 20 C Cabinet Parts ID 7 15 Calculation Worksheet for 50 ohm Option 1E1 Instruments 2 51 HP 8711A INDEX for 50 ohm Standard Instruments 2 49 for 75 ohm Option 1E1 Instruments 2 55 for 75 ohm Standard Instruments 2 53 Calibration Cycle 2 3 Clearing Nonvolatile Memory SRAM 5 11 Compatible Disk Drives 2 22 Compatible Printers 2 23 Compression 2 13 Controllers 2 22 Copy from Flexible Disk to Flexible Disk 2 26 Copy to a Hard Disk 2 26 Copy to a High Density Flexible Disk 2 26 Correction Constants How to Update 5 8 CPU Assembly 7 4 How to Remove 7 5 Parts ID 7 4 Theory of Operation 6 3 CRT Cleaning 1 2 D Data Disk 2 27 De
136. p middle of the panel and the other on the bottom middle of the panel Disconnect the front panel ribbon cable Frac N board Front panel assembly ribbon cable Handle plate screws on each handle Hodie handles on each handle Figure 3 7 Removing the Handles and Front Panel 6 Reconnect the frequency counter and adapter s to the RF OUT connector 7 To obtain a counter reading of 500 MHz 2500 Hz or better adjust R1 on the frac N reference assembly accessible through a hole in shield between J1 and J3 8 Reassemble the analyzer 3 10 Adjustments SET SERIAL NUMBER ADJUSTMENT This procedure shows you how to store the analyzer s serial number in the CPU EPROM You should perform this procedure whenever you replace the CPU board You can only perform this procedure over HP IB so an HP BASIC controller either external or IBASIC is required Note Where XXXXXXXXXX appears below replace those characters with the serial number of your analyzer but maintain the leading and following apostrophes both are ASCII character 39 For example if the serial number of your analyzer is 1234456789 the HP BASIC line of code would be OUPUT 716 DIAG SNUM 1234A56789 1 Write down the 10 character serial number exactly as shown on the analyzer rear panel label 2 Use one of the following BASIC commands to set the serial number Replace the XXXXXXXXXX in the command with your analyzer s serial number
137. performed 3 Disk drive light goes on Firmware loads from ROM The analyzer beeps twice when this is done 4 The CRT displays the status of the main self tests 5 During the next 5 seconds the messages appear on the CRT Initializing Calculating correction coefficients 6 The graticule is displayed along with information on the model number firmware revision and installed options Troubleshooting 4 7 If the analyzer follows this sequence with no error messages and no front panel or disk drive problems continue with the Troubleshooting Source Group Problems section Find the description of the first problem that occurred and follow the procedure below Error During Power up No at turn on but CRT display normal the problem is probably in the sound generator or speaker on the CPU board Check the sound generator chip U143 and the speaker LS1 or replace the CPU board No beep at turn on and no CRT display the problem is most likely one of two conditions 1 No power to CPU board no CPU LEDs on 2 CPU chip not plugged into its socket CPU LEDs will be on Look through the Test Results hole on the rear panel to see if LEDs are on If no LEDs are on push the CPU board all the way into the backplane connector to make a good connection You will need to remove the PS dis play assembly to do this Note that it is also possible for the board to have a bad or intermittent backplane con nection
138. pressing Refer to Figures 5 1 and 5 2 for the service key menu maps Also included in this chapter are miscellaneous service functions and HP IB commands Procedures to clear nonvolatile memory SRAM and to load firmware are included in the Miscellaneous Service Functions sec tion Equivalent HP IB commands for some of the service menu keystrokes are found in the HP IB Command Reference for Service section INTERNAL DIAGNOSTICS AND ADJUSTMENTS SUMMARY The internal diagnostics menus are shown in Figure 5 1 and are described in the following paragraphs The internal diagnostics key i This key is accessed by pressing 2 SYSTEM OPTION IBASIC HP IB Service Test and Adjustments Diognostics Adjustments Select Sel f Test Select Adjustment Execute Test Tests ond Adjustmts Instrument Info Service Utilities Mecs Options instrument Settings System Config Service Service Functions Updote Corr Const Anolog Bus Stop Test Prior Menu Prior Menu sdB3Jo Figure 5 1 Internal Diagnostics and Adjustments Menu Service Key Menus 5 1 INSTRUMENT SETTINGS MENU This is not one of the service key menus but appears here as a reminder that it can provide information useful for servicing the analyzer This menu is documented in the operating manual see 1 in Chapter 7 Reference or 2 look up any of the individual instrument settings keys in Reference TESTS AND ADJU
139. quipment in chapter 1 However the procedure is based on the rec ommended model or part number Warm up time is 1 hour Om nt TEC MhmmimsRd B 2 10 Performance Tests HP 8711A Network Analyzer Frequency Counter BNC Input For 7562 Analyzers only Minimum Loss Pad e m Adapter Type N m to BNC f a Setup for Frequencies 500 MHz HP 8711A Network Analyzer Frequency Counter Type N Input For 755 Analyzers only Minimum Loss Pad b Setup for Frequencies 500 MHz Figure 2 4 Frequency Range and Accuracy Test Setups 1 Connect the equipment as shown in Figure 2 4a 2 Setthe frequency counter input switches to the 10 Hz 500 MHz and 50 ohm positions 3 Press on the analyzer To check frequency range and accuracy 4 Press to set a CW frequency of 300 kHz Write the frequency counter reading on the test record located at the end of this chapter Performance Tests 2 11 5 Repeat the previous step for the frequencies through 100 MHz listed on the test record The upper and lower specification limits and the measurement uncertainties are listed for each frequency 6 Connect the equipment as shown in Figure 2 4b 7 Setthe frequency counter input switch to the 500 MHz 18 GHz position 8 Repeat step 4 for the remaining frequencies listed on the test record If any frequency measured is close to the specification limits either in or out of speci
140. receiver again at the TRANSMISSION or RF IN port The signal from this port is the B input The R A and B inputs can be processed in one of two ways For narrowband measurements the RF input signal is downconverted to a lower IF frequency of 27 778 kHz using mixers These mixers are driven by the Receiver LO signal from the A4 source assembly After the signal is downconverted it is amplified filtered and sent to the analog to digital converters ADCs 6 6 Theory of Operation For broadband measurements the RF input is converted to a DC signal with a diode detector This DC signal is chopped at a 27 778 kHz rate and then sampled at a rate of 55 5 kHz This signal is then amplified filtered and sent to the ADCs The HP 8711 has two internal diode detectors B and R The A input does not have a broadband detector The analyzer can also use one or two external broadband detectors These detectors convert the measured RF signal into DC signals which are referred to as the X and Y inputs The DC inputs are multiplexed into the same choppers used for the B and R detectors the B and Y inputs share a chopper and so do R and X The signal then follows the same path as the one used for the internal broadband detection There is also a rear panel connector for an auxiliary input This input displays DC or low frequency AC signals from 10 to 10 volts The analyzer uses adjustment tests to generate correction constant data for all of the in
141. rmal Line Printer Figure 2 8 Compatible Printers Step Attenuator Some of the automated tests use a coaxial step attenuator It can be either of these HP 8496A manual HP 8496G programmable use with HP 11713A attenuator driver as part of an automated system System Software Requirements BASIC Operating System The performance tests software requires HP BASIC versions 5 0 or higher Binaries and Drivers The software also requires several binaries code modules of computation and I O capa bilities The required binaries language extensions and drivers are listed in the To Load the Operating System and Binaries procedure located later in this section To Connect the Automated System 1 Make the connections as shown in Figure 2 9 Controller Disk Drivo ThinkJet Printer HP 8711A Network Analyzer HP IB Address 701 Address 700 HP IB Cables HP IB Address 716 Figure 2 9 Automated System Connections Performance Tests 2 23 2 Check that all the HP IB addresses of the instruments are set as shown below HP IB Address Analyzer Spectrum Analyze 1 Pine Sid If you want a different address for any of the instruments other than those shown above refer to the procedure in To Edit the Device Configuration located later in this section To Load the Operating System and Binaries 1 Insert the BASIC system disk into the disk drive and switch on
142. rom the performance tests main menu use the cursor keys to position the arrow to REPORT GENERATOR and pres To print the test results choose one of the following If you want the results of all the tests printed use the cursor key to position the arrow to Print All and press If you only want the results of one test printed position the arrow to Select One and press Move the arrow to the test you want printed results of and press Use the cursor keys to choose PRINTER or CRT if you want the results displayed on the screen Press The program generates the test results and displays them in a performance test record format 2 30 Performance Tests 2 5 SPURIOUS SIGNALS AUTOMATED PERFORMANCE TEST In this procedure a spectrum analyzer measures the harmonics and other spurious signals that may appear in the analyzer source output spectrum To measure a harmonic of the fundamental frequency the analyzer is tuned to the fundamental frequency a power measurement is made for reference and then the spectrum analyzer is tuned to the harmonic or spur and a measurement is made The specifications and typical values the instrument performance is tested against are listed below Harmonics specification 300 kHz to 1 MHz 20 dBc 1 MEZ to 1 3 GHz 30 dBc Non harmonic spurious typical characteristic 30 dBc To set up the equipment Thelist below shows the equipment used in this test You can use any equip
143. ror correction is a mathematical function verifying the calibration kit and these system characteristics is sufficient to ensure that the corrected directivity and port match specifications are met Note that the performance of the uncorrected hardware does not affect the accuracy of the corrected system although it will affect the stability You should have your calibration kit s recertified at least once a year to verify that they still meet their specifica tions System dynamic accuracy and noise floor are tested as part of the performance tests No other test is re quired or provided to verify the user corrected directivity and port match The analyzer also has a default calibration available This test checks the performance of the instrument with the default correction on This is a non warranted supplemental characteristic it is not a specification System directivity typical characteristic 30 dB default correction Port match typical characteristics 20 dB Transmission Port 14 dB Reflection Port To set up the equipment The list below shows the equipment used in this test The HP 85032B for 50 ohm analyzers or the HP 85036B for 75 ohm systems must be used Warm up time is 1 hour Performance Tests 2 45 Recommended Model or HP Part Number P80 it 750hm pt with BASIC 5 0 or higher IB cables 2 Disk drive 9122C D 9122C D mrasa Ios EIC Controller Disk Drive ThinkJet
144. s If the serial numbers match the program allows you to edit the report header information date your name report number temperature and humidity If the serial numbers not match the program erases any existing TEST DATA file and sets up anew one It allows you to edit the report header information Move the arrow pointer to the test you want to run by pressingthe arrow keys The tests appear in the recom mended sequence Press Youcanrerun tests as many times as necessary without repeating all of the previous menus However results from the previous run will be overwritten To Recover from an Error If an error is detected it is reportedto the user with an explanation of the error and the name of the subprogram that detected the error The error message screen also provides one or more softkeys 1 2 Press the Press the softkey to return you to the most recent major menu The program may respond slowly especially if the analyzer is making a slow sweep Be patient softkey to repeat the routine which just detected the error Use this key when for example an HP IB cable is missing and a device does not respond to the controller Connect the cable and press Performance Tests 2 29 PRINTING PERFORMANCE TEST RESULTS The program allows you to generate the test results in test record format The test results can be displayed on the analyzer screen or output to a printer 1 F
145. s to have an HP IB problem 4 4 Troubleshooting Troubleshooting the Analyzer Use these procedures if you have read the 8711A System Troubleshooting section and you think the prob lem is in the analyzer These procedures verify each of the main functional groups in sequence to determine which board is faulty The functional groups are power supply digital control source and receiver Descriptions of these groups are provided in Theory of Operation The procedure in the following pages must be performed in the order presented Do not skip sections unless you are instructed to do so GENERAL NOTES 1 ALWAYS tum the instrument power off before removing or installing an assembly 2 If you need to disassemble the instrument be sure to work at an antistatic workstation and use a grounded wrist strap to prevent damage from electrostatic discharge ESD 3 For disassembly procedures see the Replaceable Parts chapter of this manual Some parts in the instru ment have sharp edges Work carefully to avoid injury 4 Before replacing an assembly inspect the board for obvious easy to fix defects Examples include bent pins on ICs no solder in holes around the edges of shields and cold solder joints 5 Toconfirm the problem or troubleshoot further refer to the Detailed Troubleshooting section of this chap ter or the HP 8711 Schematic Package available separately for more information TROUBLESHOOTING POWER
146. s told to store the CCs to disk and update the firmware first If the flash EPROM is clear the correction constant data is transferred from the buffer into the EPROM To update or load firmware refer to Loading Firmware later in this chapter Note This copies al the adjustment data If an adjustment test has not been done the default values are put in EPROM and the only way to replace them with real adjustment data is to do the adjust reload the firmware Goes back to the service menu ANALOG BUS MENU The HP 8711 has an analog bus that can be used to troubleshoot hardware problems on some of the boards in the instrument This is done by sampling analog bus nodes which provide measurements at selected points on the boards Nominal values for each node are provided in the following table Allows the user to select an analog bus node to be measured The currently selected node de scription and number are displayed A node may be selected by using the keypad to enter the number or by using the RPG or up down arrows to scroll through the list Triggers a data measurement of the selected analog bus node Goes back to the service menu ANALOG BUS NODES 1 47 Volts 47V power supply on the source board 47A on the schemat ic Normal value 44V to 50V VCO tuning voltage for the RF1 phase lock loop on the source board RF1_TUNE on the schematic Value varies with the source frequency setting Normal values are 6 to 1
147. stment the analyzer will abort the test If you press the Recommended Model or Part Number Equipment 50 ohm std 75 ohm opt 1EC Type N cable p n 8120 4781 HP p n 8120 2408 1 Connect a cable from the REFLECTION port to the TRANSMISSION port 2 Press The analyzer uses averaging for completing the test 3 Ifyouare NOT going to make any more adjustments finish with the procedure titled To Permanently Store CCs in the Analyzer part of Storing and Recalling CCS at the end of this chapter 4 Ifyou ARE going to make adjustments save the correction constant data that you ve generated so far insert a formatted disk into the internal disk drive Press E This creates a file or writes over an existing file with the name 3 22 Adjustments REFLECTION ONE PORT CORRECTION ADJUSTMENT This procedure shows you how to correct for errors in reflection measurements You measure an open short and load with the HP 8711 to perform a one port reflection calibration key during this adjustment the analyzer will abort the test Recommended Model or Part Number Equipment 50 ohm std 75 ohm opt 1EC HP 85032B E HP 85036B E 1 Press euor 2 Connectthe male calibration kit devices to the REFLECTION port when prompted on the analyzer screen after each device is connected 3 Ifyouare NOT going to make any more adjustments finish with the procedure titled
148. sts 2 27 2 Type the msus of the mass storage medium on which the calibration data will be stored For example your system consists of HP 9836A and HP 9122D dual disk drive HP IB address 700 program disk in unit 0 of HP 9122D 5 25 inch floppy for calibration data storage HP 9836A internal drive for calibration data disk You would modify the DATA DISK MSUS column to read INTERNAL 4 0 The changes you make to the mass storage menu are re stored into file MS_CONFG and are in effect the next time the program is run You won t need to re edit this menu each time the program is run as long as the system configuration remains the same 3 If you are using an SRM system press gt A third column should appear on the screen entitled SRM DIRECTORY PATH This column must contain the directory path for the volume label and the MSUS column must contain the remote MSUS MOTE 4 Press to exit this column after editing 5 Press when you are finished editing the mass storage menu The program returns to the HP 8711 performance test main menu To Edit the Device Configuration You do not need to enter this menu if you are using the default setup or you have already modified the addresses and haven t reconfigured the system The default address are shown below Device Me 7 FONCTION GENERATOR meus ae 701 713 716 718 28 712 1 Press the down arrow and the key to select DEVICE
149. supplies 5V at TP1 and TP2 e Check for the internal 10 MHz signal at TP7 and US pin 8 If this is not found replace the frac N reference board or US the 10 MHz clock 4 18 Troubleshooting Check TP8fora 10 MHz signal If this is present Q1 is most likely bad Replace the frac N reference board or refer to the HP 8711 Schematic Package to troubleshoot further To troubleshoot frac N board the fractional N board is also used in the HP 3325A Refer to the HP 3325A Operating and Service Manual HP part number 03325 90002 for more detailed troubleshooting in formation RECEIVER GROUP To confirm an ADC problem when is at 200 dB check for activity at the following pins on the receiver s backplane connector Pin Number Signal C27 ADC_DAT1 A27 CLK1 C26 DAT2 A26 ADC CLK2 If these signals are not present replace the receiver assembly or refer to the HP 8711 Schematic Package for details Troubleshooting 4 19 Service Key Menus INTRODUCTION This chapter describes the functions of the service key menus These menus are used to test verify adjust con trol and troubleshoot the instrument They are divided into two groups internal diagnostics and adjustment and service functions Internal diagnostics and adjustments include self tests and adjustment tests The service functions allow you to put the instrument into states to help with troubleshooting Theservice menu is accessed by
150. tect Cal ON off 5 8 Detector External Correction Adjustment 3 16 Device Configuration 2 28 Digital Control Theory 6 3 Directivity 5 8 Disk Data 2 27 Program 2 27 Disk Drive 2 22 Disk Drives Compatible 2 22 Disk Initializing 2 25 Display Assembly 7 12 How to Remove 7 13 Parts ID 7 12 Theory of Operation 6 4 Documentation Part Numbers 7 16 Drivers 2 24 Dynamic Accuracy 2 4 Dynamic Accuracy Automated Performance Test 2 34 Dynamic Range 2 4 Dynamic Range Performance Test 2 13 E Edit Mass Storage 2 27 Edit the Device Configuration 2 28 Exchange Parts 7 1 Execute Test 5 2 HP 8711A RF Network Analyzer External Detector Correction Adjustment 16 F Firmware Adjustments 3 1 Firmware Revision to See on Screen 5 6 Flatness 2 17 Floppy Disk Drive 7 14 How to Remove 7 14 Parts ID 7 14 Theory of Operation 6 4 N Reference Assembly 7 6 How to Remove 7 7 Parts ID 7 6 Theory of Operation 6 4 Fractional N Spur Adjustment 3 5 Fractional N VCO Adjustment 3 3 Frequency 2 5 Frequency Accuracy Adjustment 3 9 Frequency Range and Accuracy Performance Test 2 10 Front Panel Assembly 7 3 How to Remove 7 3 Parts ID 7 3 Front Panel Removal 3 3 Front Panel Theory of Operation 6 3 Fuse Probe Power Rating 7 3 Fuse Rating 7 11 G Gain Switched Correction Adjustment 3 14 H H
151. ternal narrowband and broadband inputs For the external detectors the correction constants are stored in an EEPROM in the detector This data can be read by the receiver to correct data for the X and Y inputs There are two 16 bit ADCS on the receiver assembly The two ADCS are multiplexed between the various nar rowband broadband internal external signals The ADCS require a 2 5 MHz clock signal from the CPU board They convert the 27 778 kHz signal into digital data which is then sent to the digital signal processor DSP on the A2 CPU board Theory of Operation 6 7 Replaceable Parts INTRODUCTION Use this chapter to order replaceable parts and remove and reinstall those parts installation procedures are the reverse of the removal procedures For component level repair refer to the schematic package see the docu mentation parts list In keeping with the assembly level repair strategy of the instrument this chapter docu ments the following major assemblies cabinet parts miscellaneous parts RF shields documentation post repair procedures Warning Parts of this instrument have sharp edges Work carefully to avoid injury TOOLS REQUIRED Torxdriver sizes 10 and 15 5 8 in wrench for BNC nuts 5 16 in wrench 5 16 in nut driver for CRT nuts HOW TO ORDER PARTS Refer to the following parts lists to identify the part and its part number All of the part numbers listed are HP part numbers but commercially availabl
152. the calibration data arrays Determines whether cal arrays are used in processing data user performed cals and the default factory cal This includes transmission reflection and frequency response cal arrays both broadband and narrowband This function provides a way to examine the uncorrected perfor mance of the hardware in the instrument Service Key Menus 5 7 Allows the user to turn off the power cal for both the internal and external broadband detec tors Selects the master uninterpolated cal arrays from the master to be displayed These are arrays om n the currently active calibration default full band or user defined Leads to the view array master menu Selects the interpolated cal arrays from the master to be displayed These are the cal arrays n y active calibration default full band or user defined Leads to the view array interpol menu Goes back to the main service menu VIEW ARRAY MASTER MENU VIEW ARRAY INTERPOL MENU These keys allow you to view the actual calibration data arrays that are currently in use The arrays are copied into a memory trace for easy analysis This allows you to scale them and use markers to read out actual values Note All calibrations 801 points Displays the directivity cal array as a memory trace Displays the source match cal array as a memory trace Displays the tracking narrowband frequency response for reflection cal array as a memory tr
153. the computer power This loads the BASIC operating system into the controller 2 On the controller type LIST BIN press or to execute the command All binaries currently contained in memory are listed on the screen Compare the binaries listed on the screen to those listed below Language Extension CS80 HPIB or CRTB depends on CRT 3 of the required binaries are missing insert the Drivers disk provided with the system into the disk drive Load the Configure program by typing LOAD CONFIGURE press to start the program By following the prompts this program lets you select the necessary binary modules and loads them In Case of Difficulty Refer to the HP BASIC user s documentation for more comprehensive instructions on loading the operating system and binaries 2 24 Performance Tests BACKING UP THE SOFTWARE PROGRAM To protect the performance tests program make a working copy of the program disk You should maintain the master program disk in a write protected mode to keep it from being written to or initialized destroyed Copy the master program disk using the instructions below and then use the working copy to perform the tests If the working copy is damaged or lost the master is always available To Initialize a Disk A blank disk must be initialized before it can be copied to You should initialize two disks one to use as the working copy of the program disk and one to use as the
154. time you want to quickly confirm that the analyzer is performing correctly When to Perform the Manual Performance Tests Perform these tests to check the analyzer against its specification or typical values in these areas frequency range and accuracy dynamic range power range flatness e broadband frequency response When to Perform the Automated Performance Tests Perform these tests with a controller to check the analyzer against its specifications or typical values in these areas spurious signals dynamic accuracy absolute power accuracy system directivity and port match Performance Test Notes The tests can be used for incoming inspection preventative maintenance troubleshooting and calibration The tests should also be done following repairs verifying that the problem has been fixed Refer to the Post Repair Procedures figure in the Replaceable Parts chapter for a listing of the tests to do when replacing a particular assembly The tests be done in any order However Operator s Check should be done first since this test could indicate an instrument failure before doing the performance tests The specifications and supplemental operating characteristics are listed in Figure 2 1 and individually at the beginning of each test All the performance tests can be completed in about 3 hours not including instrument warm up time of one hour If the Analyzer Fails a Test Refer to the final paragraph of
155. ting 4 9 Serial Number Adjustment 3 11 Serial Number to See on Screen 5 6 Service Key Menus 5 1 Service Manual Organization of 1 1 Service Modes 5 5 Service Test Equipment 1 3 Service Tools Part Numbers 7 16 Service Utilities Menu 5 6 Set Attenuator 5 7 Set Serial Number Adjustment 3 11 Setting Up An Automated System 2 22 Signal Purity 2 5 Signal Purity Test Setup 2 32 Software Backup 2 25 Copy from Flexible Disk to Flexible Disk 2 26 Copy to a Hard Disk 2 26 Copy to a High Density Flexible Disk 2 26 Error Recovery 2 29 Loading and Running 2 27 Requirements 2 23 Software Part Numbers 7 15 Source Assembly 7 8 How to Remove 7 8 Theory of Operation 6 4 Source Characteristics 2 4 Source Match 5 8 Source Power Correction Adjustment 3 18 Specifications 2 4 Spurious Signals Automated Performance Test 2 31 Spurs How They re Avoided 6 5 Stop Test 5 2 Store CC to Disk 5 9 Store CC to EPROM 5 9 Sweep Time 2 5 Switched Gain Correction Adjustment 3 14 System Accuracy 2 5 System Addresses Automated 2 24 System Directivity and Port Match Automated Performance Test 2 45 System Theory 6 1 T Test Equipment 1 3 Test Record 2 57 Test Set Characteristics 2 4 Test Software 2 27 Tests and Adjustments Menu 5 2 Tracking 5 8 Transmission Correction Adjustment 8 22 Troubleshooting Centronics Printers and Plotters 4 3 Detailed 4 18
156. ting file with the name CC data Adjustments 3 25 B AMPLITUDE CORRECTION ADJUSTMENT This procedure shows you how to increase the absolute power accuracy in B measurements First the HP 8711 sets up a 30 MHz signal and applies power levels of 54 dBm to 18 dBm in 2 dB steps to the B input Then the analyzer compares the measured value to the nominal value and generates a correction table To perform this procedure you need an HP BASIC controller The controller uses the power meter to accurately set the level of an external source and signals the HP 8711 when the level is correct This external source signal is then measured by the B input If you press the key during this adjustment the analyzer will abort the test Caution You must run adjustment test 103 ext det corr before running the B amplitude correction e adjustment Recommended Model or Part Number Equipment 50 ohm std 75 ohm opt 1EC HP BASIC controller with HP 9000 series 200 300 HP 9000 series 200 300 BASIC 5 0 or higher HF pn 0871 1000 HP SIGA HP 636A perm HP 437B or 438A HP 437B or 438A HP 8483A High sensitivity power sensor HP 8481D opt H70 HP 8481D opt H70 50 reference attenuator HP 11708A farse Attenuator Switch driver HP 11713A HP 11713A optional HP 10833A HP pin 8120 4781 HP pin 1250 1475 BP pin 1250 0077 HP p n 1250 1472 oe z gt
157. to confirm that an HP 8711 network analyzer is performing to its specifications The chapter is organized as indicated below Verifying Instrument Performance When to Perform the Operator s Check When to Perform the Manual Performance Tests When to Perform the Automated Performance Tests Performance Test Notes If the Analyzer Fails a Test Recommended Test Equipment Analyzer Calibration Cycle HP 8711A Specifications Operator s Check Verifying Performance with Manual Tests Performance Test Worksheet and Record 2 1 Frequency Range and Accuracy Performance Test 2 2 Dynamic Range Performance Test 2 3 Power Range and Flatness Performance Test 2 4 Broadband Frequency Response Verifying Performance with Automated Tests Setting up an Automated System Backing up the Software Program Loading the Software Printing Performance Test Results 2 5 Spurious Signals Automated Performance Test 2 6 Dynamic Accuracy Performance Test 2 7 Absolute Power Accuracy Performance Test 2 8 System Directivity and Port Match Automated Performance Test Calculation Worksheet for HP 8711 Performance Tests Performance Test Record VERIFYING INSTRUMENT PERFORMANCE This chapter contains three types of procedures to confirm an HP 8711 is performing correctly operator s check e manual performance tests e automated performance tests Performance Tests 2 1 When to Perform the Operator s Check Use this operational check for incoming inspection or any
158. to disk Enter the last five digits of the attenuator serial number and press If you DO NOT want the data stored to disk press 11 Follow the prompts on the controller screen 12 Connect the power sensor to the attenuator and press any key to continue 13 Make the connections as shown in Figure 2 12 and press any key to continue 2 38 Performance Tests Controller Disk Drive Thinkjot Printor HP 8711A Network Analyzer grin ad Power Meter a For 50 Ohm Systems Controllor HP 8711A Disk Drive Network Analyzer Thinkjet Printer Minimum Loss Pad Power Step Attenuator b For 75 Ohm Systems Figure 2 12 Measurement Setup for Dynamic Accuracy Test Performance Tests 2 39 14 When the test is done the program returns you to the performance test menu 15 If you are not going to make anymore performance tests print the test results to either the screen or to a printer Refer to Printing Performance Test Results located earlier in this chapter If the Analyzer Fails the Test HP 8496G Causes Dynamic Accuracy Failure Symptom and Cause The analyzer fails the dynamicaccuracy performance test when an HP 8496G programmable attentuator is used The programmable attenuator has four attenuation sections two of them 40 dB sections This can lead to mea surement ambiguities at attenuation settings that use just one of the 40 dB attenuators The following table sum mari
159. ts are installed 4 Insert the correction constants disk 5 12 Service Key Menus to load the correction constants into 5 Press asme RAM Note With some firmware revisions you may see a warning message indicating that the CC just loaded were made with a different firmware revisio rform one or more additional adjustments Press SYSTEM OPTIONS Spaca estand Adiueiments Select Adii Cycle through the adjust ments note any that are NOT DONE Perform these before proceeding with the next step Note that adjust ment 100 will always indicate NOT DONE and should not be performed When done cycle the power in order for the new correction constants to take effect Service Key Menus 5 13 HP IB COMMAND REFERENCE FOR SERVICE Some of the service menu keystrokes have equivalent remote HP IB commands The HP 8711 uses the SCPI programming language For more information about SCPI and HP IB refer to the HP IB Programming sec tion of the Operating and Programming manual Service related SCPI commands are listed in two sections be low Syntax Summary The following conventions are used when SCPI commands are being described e Angle brackets lt gt are used to enclose required parameters within a command or query The definition of the variable is usually explained in the accompanying text e Square brackets are used to enclose implied or optional parameters within a command or query
160. ts the power up self tests by number with a description of the error messages and troubleshooting information Some of the troubleshooting hints may require the use of a service extender board or the HP 8711 Schematic Package Reference designators for main ICs e g U32 are noted on the PC boards Note that replac ing the defective board is always an option you need not troubleshoot to a more detailed level Check the Test Status LEDs then locate that test number in the table to determine what to do For test numbers above 19 the name of the test is usually in the failure message so look for the test name in the table Refer to the Service Key Menus section of this manual for detailed descriptions of each test Note that not all error messages are listed in the table Many error messages describe the problem clearly and require no further explanation so they are not included in this manual Table 4 1 HP 8711 Self Tests 1 of 4 1 Some error messages are only partially reproduced because the remainder of the mes sage is specific to the error e g provides address at which the failure occurred 2 lt num gt indicates either an address or a value These may be in decimal or hexadecimal notation Applicable Error Messages amp Notes Errors begin with CPU TEST FAIL Remove CPU board make sure U56 is seated its socket If test still fails replace CPU board or U56 BootROM Checksum Errors Bad checksum table at ROM
161. ug it in and turn on the power Red LED still blinking replace the PS Red LED now off go to Remove Assemblies the supply was loaded down by another assembly Measure Power Supply Voltages Remove the backplane cover from the rear panel Figure 4 1 shows the pinouts for J1 There are 4 main supplies each with its own return plus the standby voltage which powers the nonvolatile SRAM on the CPU board Mea sure the voltages with a voltmeter values should be within 5 of nominal 1 9 12V O lo 12vrin 5 5V O J1 LPwr Fail POWER SUPPLY O noconnection 15 75 15V 8 15 Figure 4 1 Power Supply Connector Voltages not correct remove the PS display assembly plug in the AC power and turn it on Check the four PS LEDs visible from the right side of the display enclosure as viewed from the front One or more LEDs off replace the PS All LEDs on reseat the PS display assembly making sure there s a good connection to the rear panel Measure the voltages again If the problem persists check connectors on PS and on backplane board Voltages correct but probe power problem remove the front panel and check the fuses on the back of the front panel PC board Continue with the Troubleshooting Digital Group Problems section 4 6 Troubleshooting Remove Assemblies You re here because one of the assemblies is caus
162. ured Value dB at 7 dBm Figure 2 17 Power Range and Flatness Test FOR 75Q OPTION 1E1 1 Set power to 7 dBm for 1 3 GHz measurement 2 HP 8483A sensor reading 3 HP 8481D power sensor reading 4 HP 8481D power sensor reading 5 HP 8481D power sensor reading Corrected for HP 11852B loss Performance Tests 2 55 Figure 2 18 Power Range and Flatness Worst Case Values FOR 759 OPTION aa en EL e ee ee ee pe 20 dBm Figure 2 19 Broadband Frequency Response FOR 752 OPTION Frequency First Setup Second Setup Y a b d e MHz Marker Power Meter Marker Power Meter 9 5 a b c d Value Reading Value Reading RENE DECUS 2 56 Performance Tests Test Facility Model Serial Number Options Calibration Constants Revision Special Notes HP 87114 Test Record 1 of 4 Report Number Date Customer Tested by Ambient temperature Relative humidity Line frequency Hz nominal HP 8711A Test Record 2 of 4 Report Number Date Test Equipment Used Model Number Trace Number Cal Due Date Performance Tests 2 57 502 STANDARD HP 8711A Test Record 3 of 4 Serial Number Number Serial Number _______ Number Test De Measurement 7 Specification Specification Uncertainty 2 1 Frequency Range and Accuracy
163. ust the HP 8711 You need an external controller for running three of the adjustments but the remaining adjustments are accessed through the analyzer s service me nus Refer to Post Repair Procedures in the Replaceable Parts chapter to determine what adjustment procedures you need to do when a particular part has been replaced You should perform the adjustment procedures in the order given Adjustment Description Fractional N VCO Adjustment Fractional N Spur Adjustment Requires controller Frequency Accuracy Adjustment Serial Number Requires controller LO Power Correction Switched Gain Correction External Detector Corection Aux Input Correction Source Power ALC Correction B Amplitude Correction Transmission B R Correction Reflection One Port Correction R Amplitude Correction R Frequency Response Correction B Amplitude Correction Requires controller Storing and Recalling Correction Constants Firmware Adjustments When you switch on the analyzer power the HP 8711 copies the current correction constants from the CPU EPROM into a RAM buffer When you run adjustment tests the analyzer generates correction constants and saves them to the RAM buffer only they are erased if the power isswitched off To transfer the newly generated correction constants from the RAM to the EPROM perform the Storing and Recalling Correction Constants procedure in this chapter You can also use the procedure in
164. ut is DC coupled If the 10 MHz signal has spurs replace the frac N reference board Otherwise replace the source TROUBLESHOOTING RECEIVER PROBLEMS Connect a cable between the reflection and transmission ports then press PRESET The display should show a flat trace at about 0 dB Press The display should resemble Figure 4 3 below although the exact pattern and magnitude of the ripples will depend on the cable being used gt Chan 1 Reflection Log Mag 10 0 dB Ref 0 00 dB Figure 4 2 Reflection Measurement with Through Cable Receiver troubleshooting is organized by these symptoms Trace at 200 dB Random Noise Trace e Spurs in Data Trace e Incorrect Data e Power Problems Trace at 200 dB A flat trace at 200 dB indicates that the DSP is getting no data or zero data Make sure that the receiver and CPU boards are making proper connections to the backplane The problem is most likely either in the ADCs on the receiver board or the DSP circuitry on the CPU board Test the DSP circuitry locate J32 an 8x3 jumper just above the DSP shield Put the jumper in the TEST position as shown on the board This replaces the receiver s ADC clock and data signals with a clock signal and fake data generated on the CPU board The instrument should power up normally Observe the CRT e Random noise data trace around 0 dB replace the receiver or go to Detailed Troubleshooting Troubleshooting 4 15 No random nois
165. w to generate correction constants for the receiver to make external detector or internal broadband measurements Perform this test whether or not you plan to use external detectors The exter nal detectors HP 86200A and HP 86201A convert the detected power level into voltages These voltages are then routed to the receiver through the X and Y external detector inputs on the rear panel of the HP 8711 If you press the key during this adjustment the analyzer will abort the test Voltmeter 1 Press SYSTEM OPTIONS 2 Attach the detector adapter to the X detector input and connect the wires together This supplies zero volts between pins D red connector V and C black connector the detector con nector 7 Press 3 When the prompt is displayed in the dialogue box disconnect the adapter wires 4 Use the voltmeter to set one of the DC power supplies to 0 5 volts and the other DC power supply to 40 5 volts 5 Apply the 0 5V to pin D red connector and the 0 5V to pin C black connector Connect ground to pin K green connector 6 When the measurements are done disconnect the adapter from the power supply 7 Move the detector adapter to the Y detector input Repeat steps 2 through 6 If the analyzer fails the adjustment test resulting in a warning message check the connections and voltages and rerun the test 8 If youare NOT going to make any more adjustments finish with the pr
166. wer meter When you connect the sensor to the analyzer do not use the reference attenuator 10 Connectthe HP 11852B minimum loss pad between the analyzer REFLECTION port and the power sensor 11 Repeat steps 2 through 4 again but DO NOT record the maximum and minimum values in Figure 2 18 or the test record Subtract the 8481D readings from the HP 8483A readings to determine the loss of the HP 11852B 12 Press to set the analyzer power to 60 dBm 13 Repeat steps 2 through 4 Addthe HP 11852B loss to each HP 8481D reading to obtain the corrected power values for each frequency Write the corrected minimum and maximum power values and the test result in Figure 2 18 and the test record To check power holes 1 Connect the equipment as shown in Figure 2 5 Fora 50 ohm HP 8711 use an HP 8482A power sensor Fora 75 ohm HP 8711 use an HP 8483A power sensor to set the analyzer frequency to 650 MHz 2 18 Performance Tests 3 Fora standard 50 ohm HP 8711 press to set the power to 416 dBm Set the analyzer power to the first power level listed for your instrument option under Power Hole Check on the test record 4 Setareference power level on the power meter Press for an HP 436A Press for an HP 438A 5 Press of 300 kHz and a stop frequency of 1300 MHz 6 Press 5E Read the power levels displayed on the power meter for the 5 minute sweep and verify that all points are within a 2 dB limit
167. wer up Error Occurs During DSP Initialization or Calculating Coefficients Clear the nonvolatile SRAM turnoff power to the analyzer then tum it back on While the analyzer is going through its self tests Main and SIMM DRAM tests or shortly afterwards press the key a few times The analyzer will pause after performing the CPU main self tests and ask if you want to zero the nonvolatile SRAM Note the caution message Press to do so Continue if the error persists 5 MHz reference signal the DSP requires this signal from the frac N reference assembly for proper opera tion This signal is routed on the backplane board Make sure that the frac N reference assembly is pushed all the way in and making good contact with the backplane Measure the 5 MHz signal at 6 24 on the backplane board with a scope If the signal is present remove the CPU board and the shield over the DSP chip on the right side of the board Make sure that the TMS 320C25 microprocessor is properly seated in its socket If the prob lem persists refer to Detailed Troubleshooting to check the DSP or replace the CPU board No 5 MHzsignal on backplane check the reference board If an external reference signal is used make sure it s a 10 MHz reference with a level of at least 5 dBm If the internal 10 MHz reference is being used check the output at A3J3 to verify that the crystal oscillator is working If the 10 MHz signal is not present replace
168. y be erased all at once not partially A firmware disk is shipped with each HP 8711 New firmware disks are released periodically as improvements are made You should always keep at least one copy of firmware in a safe place because you cannot create a firmware disk yourself See Replaceable Parts chapter 7 for the HP part number of the firmware disk You can use the correction constants disk shipped with the analyzer if 1 no parts have been replaced in the instrument and 2 no adjustments have been made If however changes have been made you must use a disk with the current correction constants If such a disk is not available follow the procedure below to make a current correction constants disk Making a Current Correction Constants Disk Optional Note for details on storing and recalling correction constants see Storing and Recalling Correction Constants at the end of chapter 3 Adjustments 1 Insert a formatted disk into the internal disk drive If needed format the disk with the file utilities menu under Seve mem 2 Press 3 Remove the correction constants disk Upgrading the Firmware 1 Insertthe firmware disk and cycle power the analyzer indicates that it detects a firmware disk and is about to install the new firmware 2 Press hen prompted the firmware takes about 5 minutes to load 3 Remove the firmware disk and cycle the power again the analyzer indicates that no correction constan
169. ynthesizer for the source The 30 to 60 MHz frac N VCO output is used for phase locking the source LO signal which in turn is used to generate the source RF output A4 Source The source assembly provides two output signals One signal which covers the 0 3 to 1300 MHz range is the main source RF output signal It goesto the receiver board and through an optional step attenuator before it gets to the RF OUT REFLECTION port on the front panel The other signal serves as the internal receiver LO for downconverting narrowband signals The two signals are independently phase locked and they are separated from one another by the receiver IF intermediate frequency of 27 778 kHz These two signals are generated from 3 phase locked VCOs as shown in Figure 6 2 In normal operation the RF1 VCO is phase locked to a 1 MHz reference signal to produce a stationary 2340 MHz signal The 1 MHz Signal is derived from the 10 MHz output of the frac N reference assembly Similarly the RF2 VCO is also phase locked to the 1 MHz reference to produce a stationary signal that is offset from RF1 by the receiver IF of 27 778 kHz The Source LO VCO supplies the LO drive for the two source mixers It covers a 2340 3 to 3640 MHz range It is phase locked to fractional N sweeping synthesizer A3 As this phase lock loop sweeps the main Source RF output is generated as the mixing product of the 2340 MHz RF1 signal and the sweeping 2340 3 to 3640 MHz Source LO signal
170. yzer measures the narrowband B input at a CW frequency of 1 0 GHz with the LO power DAC at its maximum value Then you reduce the DAC value until the trace level drops 0 2 dB If you press the key during this adjustment the analyzer will abort the test Recommended HP Part Number be ees 50 ohm std 75 ohm opt 1EC 1 Connect a cable from the REFLECTION port to the TRANSMISSION port 2 Press seemucenom The analyzer autoscales the display to 0 1 dB division It s normal for the trace to show some noise up to 1 division peak to peak At the start of the adjustment test the analyzer checks that the nominal power level is correct If the power is not correct the analyzer aborts the test and displays a FAILED message This failure is usually caused by a faulty through cable 3 Usethe down arrow key or the front panel knob to decrease the DAC value until the trace level drops about 0 2 dB 2 divisions Typically this will be at DAC values below 50 If the trace level drops less than 0 2 dB at one DAC value but more than 0 2 dB at the next DAC value choose the higher DAC number The 8711 presets when the test is done 5 Ifyouare NOT going to make any more adjustments finish with the procedure titled Permanently Store CCs in the Analyzer part of Storing and Recalling CC at the end of this chapter 6 If you ARE going to make more adjustments save the correction constant data th
171. zes which attenuation values use which attenuator sections in the dynamic accuracy performance test Section Used 31 2 Solution Either get both 40 dB sections calibrated or change the software to access the proper 40 dB section Note that the 40 DB section used is not the section used in the HP 8752 3 software To change the software load the pro gram dyn_accy and EDIT step_attn Instructions are provided in the code listing If the analyzer still fails the test suspect the receiver or CPU assembly Refer to Switched Gain Correction Adjustment and Amplitude Correction in the Adjustments chapter Spur problems may also cause this testto fail Refer to Fractional N Spur Adjustment and LO Power Correc tion Adjustment 2 40 Performance Tests 2 7 ABSOLUTE POWER ACCURACY AUTOMATED PERFORMANCE TEST Absolute power accuracy refers to the analyzer s receiver accuracy when making power measurements in broad band mode B There are no warranted specifications for this characteristic but values that reflect typical per formance are provided Use the automated test with the following procedure to check the analyzer s power measurement accuracy The results indicate how well the analyzer was able to measure its own noise floor in the dynamic range test During the test the controller sets the analyzer to 30 MHz and uses a power meter to accurately set the level

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