Sweep Oscillator 8350B Local Operation
Contents
1. FREQUENCY The gray area shown above controls the sweep modes and frequency limits START STOP When either the START or STOP key is pressed the sweep oscillator is put in the START STOP mode swept RF output begins at the START frequency and ends at the STOP fre quency The START frequency must be less than or equal to the STOP frequency The left FREQUENCY display shows the value of the start frequency While the right FRE QUENCY display shows the value of the stop frequency Frequencies may be changed in three ways Frequency control knob Provides continuous adjustment Clockwise rotation increases frequency Keyboard data entry Specific frequency values may be entered for the active fre quency mode by Pressing the desired values and units Step Control Key THE ACTIVE FREQUENCY FUNCTION can be incremented or decremented by pressing the appropriate STEP key The value of the STEP SIZE can be set to any desired value see STEP SIZE for setting procedure CF AF The CF AF mode allows the swept output frequency range to be read as a center frequency and a frequency sweep width The output frequency is swept from CF AF 2 start fre quency to CF AF 2 stop frequency When changing between CF AF and START STOP modes only the method of display changes The swept RF output remains the same When either CF or AF is activated the left display shows the center frequency CF the right display shows the delta fre2. 8350B SWEEP OSCILLATOR Copyright HEWLETT PACKARD COMPANY 1983 1400 FOUNTAIN GROVE PARKWAY SANTA ROSA CA 95404 MANUAL PART NO 08350 90034 Microfiche Part No 08350 40035 Printed JANUARY 1983 t A Model 8350B LOCAL OPERATION INTRODUCTION This Local Operation handbook provides information on the local use non HP IB of the 8350B Sweep Oscillator with 83500 series Plug ins Throughout this handbook are blocks of example procedures on implementing some of the information The front panel controls are divided into function groups These groups and other information topics are arranged in the following sequence GETTING STARTED Brief example of control usage e INSTRUMENT PRESET Error codes and preset conditions DATA ENTRY Numeric step units and shift keys FREQUENCY Mode selection vernier and offset FREQUENCY TIME Markers and sweep control SAVEn RECALLn ALTn Storage Registers Step Up Advance DISPLAY FUNCTION Blanking Modulation and Sweep Out In 83500 SERIES PLUG INS Power signal and crystal markers USE WITH SPECIFIC MEASUREMENT EQUIPMENT HP 8756A Scalar Network Analyzer HP 8755S Frequency Response Test Set HP 8410B Network Analyzer HP 7010B and other X Y Recorders HP 5343A Frequency Counter APPENDIX Rear panel connector information APPENDIX 2 Use of 86200 series Plug Ins with 11869A Adapter APPENDIX
3. the left FREQUENCY display and the 0 lamp will be lit To exit the displayed offset mode press the appropriate mode key ie START CW etc The sweep limits displayed will appear to be unchanged however the 0 lamp will be on indicating the offset is present and the actual RF output frequency will be shifted To display or adjust the frequency offset press SHIFT VERNIER To zero the offset press SHIFT VERNIER 0 MHz OVERRANGE The 8350B will permit frequency sweeps beyond the specified range of the Plug in by 42 0 of the Plug in bandwidth However Plug in performance in the overrange condition is unspecified As a warning of the frequency overrange condition the GHz or MHz annunicator will flicker in the appropriate function display Figure 3 Frequency Controls 2 of 2 Local Operation Local Operation Model 8350B OT 8 nie Mope a sro WEEP TRIGGE H UNE int FREQUENCY TIME The FREQUENCY TIME portion of the front panel shown above enables the control of the SWEEP TRIGGER modes the SWEEP modes and the frequency markers SWEEP The 8350B SWEEP Mode select keys provide three ways to control the frequency sweep TIME MANUAL and EXTERNAL sweep described below TIME When the TIME key is pressed the output is swept at the user specified or default rate If the time key 15 lit but the display re
4. in display indicates the RF output power The output power may be varied using the POWER control knob keyboard or step keys Note that the internal leveling must be on and the unleveled light out for calibrated output power See Plug in manual for Plug in calibrated range ALC dynamic range depends on Plug in installed and its options if any SLOPE Compensates for high frequency power losses in external RF cables by increasing power at higher frequencies This compensation provides a flat RF signal output at the end of a cable or test set Press SLOPE and the display will indicate dB GHz of compensation desired Use the POWER control knob keyboard or step keys to enter the amount of slope Press SLOPE again to remove all compensation POWER SWEEP This function enables the output power to be swept up The maximum calibrated power sweep range depends on Plug in installed Note that when using Plug ins withe Option 002 Step Attenuator the power cannot be swept across the internal attenuator switch points The procedure for performing a power sweep is l After selecting the output frequency sweep range or swept CW mode use the POWER LEVEL key to set the starting value for the power sweep Press the POWER SWEEP key the display will now read the dB SWEEP By using the POWER control knob keyboard or step keys set the desired sweep range The original power setting becomes the lower limit of the Power Sweep The lower limit plus the
5. knob step keys or DATA ENTRY Keyboard can be used to modify its value The value of the active marker in GHz MHz is displayed By pressing OFF the active marker only will be turned off If multiple markers are on the remaining lamps will remain lit although the display will go blank A marker may be initially activated or returned to active state by pressing the corres ponding marker key All markers may be turned off simultaneously by pressing SHIFT OFF Example To activate Marker 3 Press M3 Note M3 lamp flashing other lamps off To activate Marker 5 Press M5 Note M5 lamp flashing M3 lamp on and other lamps off Figure 4 Frequency Time Controls 2 of 3 Local Operation Model 8350B MKR Marker SWEEP In this mode the RF output is swept between markers MI and 2 The lamp over the key will be on Marker 1 must be less than or equal to Marker 2 in frequency if 1 is greater than M2 the values of 1 and M2 are permanently interchanged By varying the active marker 1 or 2 or by turning the START STOP con trols the sweep limits can be altered When both 1 and M2 are not on the sweep occurs between the most recent values of M1 and M2 To exit this mode press MKR SWEEP and the lamp over the key will go out Pressing SHIFT MKR SWEEP causes the values of and M2 to become the START STOP frequency values permanently MARKER TO CENTER FREQUENCY Whe
6. 0 volt signal in proportion to the swept or CW fre quency output OV corresponds to the lower frequency sweep limit 10V to the upper Swept RF output causes a ramp voltage out CW output causes a de voltage out This connection is necessary only when using 8412A Phase Magnitude Display 8350B 8410B SOURCE CONTROL CABLE Provides handshake lines for syn chronization between 8350B and 8410B HP Part No 08410 60146 Model 8350B D Model 8350B X Y RECORDERS The 8350B is equipped with outputs for controlling X Y analog recorders Some of the HP X Y recorders that may be used with the 8350B are 7010B 7015B 7035B 7004B 7034A 7044 7045 7046 7047 The available required signals for proper operation with an X Y recorder are X INPUT Typically SWEEP IN OUT Supplied by BNC connector on front or rear panel Y INPUT Y axis voltage On 8755S Frequency Response Test Set this would be AUX A for channel 1 or AUX for channel 2 For 8410B systems the 8412A display provides amplitude and phase outputs PEN LIFT Signal line for controlling remote pen up down Pen up is open contact or 5 volts Pen down current sink is contact closure to ground or 0 volt Supplied by BNC connector on rear panel or pin 10 on 8350B Auxiliary Program Connector RECORDER SERVO MUTE 7044 7045 7047 only Control line that mutes the power to the recorder servos for 100 ms at bandswitch when using multi band Plug ins or designa
7. 3 Summary of Sweep Oscillator front panel controls with fold out front panel drawing GETTING STARTED NOTE If a 86200 series RF Plug in and 11869A Adapter are used the Plug in coding on the adapter must be set properly to get the correct frequency display When the 8350B INSTR PRESET key is pressed the front panel of the 8350B is set to the following pre determined state The RF output is swept over the full frequency range of the Plug in at the maximum specified leveled output power minimum sweep time for the RF Plug in installed and the internal square wave amplitude modulation is off Local Operation Local Operation Example 8350B with 83525A 0 01 8 4 GHz Plug in To change from the INSTR PRESET state to 4 2 to 6 2 GHz sweep in START STOP mode 0 20 second sweep time 4 5 dBm output power 27 8 KHz square wave modulation on RF output l Press the START key and then rotate the START control clockwise to increase the start frequency until the display above the START key reads 4 200 GHz Rotate the STOP control counterclockwise to decrease the STOP frequency to 6 500 GHz Press the TIME key then turn the FREQUENCY TIME control clockwise to increase the sweep time to 0 2 second displayed on the FREQUENCY TIME display Press 1 MOD key to activate the internal 27 8 KHz square wave modulation The lamp in the center of the key will be on Press the POWER LEVEL key then turn the Plug in POWER control
8. 5343A to stop the sweep long enough to gate and count the selected frequency parameter See Figure 19 for the test set up Measuring CW frequencies When measuring CW frequencies the CNTR TRIG and STOP SWEEP connections are not necessary The 5343A should be in the AUTO mode and the internal square wave modula tion on the 8350B must be off Auxiliary Output The auxiliary output of an RF Plug in if available may be used with the 5343A When using the auxiliary output of a multi band Plug in such as the 83592A 0 01 20 GHz the fre quency multiplier feature of the 5343A may be used so that the proper RF frequency is displayed Model 8350B Model 8350B 8350B SWEEP 83500 5343A MICROWAVE OSCILLATOR SERIES PLUG IN FREQUENCY CONVERTER SWP INTEC A SWP INTFC B S oaaloooll e FAIR J appes OUTPUT RF OUT OUTPUT COUPLED DIRECTIONAL COUPLER Figure 19 5343A Test Setup Notes on connections A power splitter or directional coupler may be used as long as the input to the 5343A does not exceed 7 dBm or go below the minimum sensitivity CNTR TRIG Counter Trigger Output for controlling the HP 5343A Microwave Fre quency Counter This allows a frequency count of the selected marker START or STOP frequency of the present sweep Connects to the SWP INTFC A sweep interface on the rear panel of the 5343A to externally trigger the counter STOP SWEEP
9. Input for stopping the progress of the forward sweep When connected to the SWP INTFC B sweep interface on the rear panel of the 5343A the 5343A stops the sweep long enough for the counter to gate and measure the selected frequency marker START or STOP frequency If the internal modulation on the 8350B is on it is momentarily disabled so that the counter may measure the frequency To measure a START STOP or marker frequency during a sweep 5343A Set to AUTO SWP M and set desired frequency resolution Set the rear panel ACQ TIME switch to MED 8350B Select the frequency parameter to be measured by pressing the appropriate key START STOP any marker Mn where n 1 5 and then press SHIFT M2 If the sweep setting is changed or it is desired to exit this mode disable the 5343A by press ing SHIFT M3 on the 8350B front panel Example To measure the START frequency l Connect equipment as shown in Figure 19 Set the 5343A to AUTO SWP and set desired frequency resolution 2 Press the 8350B INSTR PRESET START SHIFT M2 keys The 5343A will tem porarily stop the sweep measure the frequency and display it at the desired resolution Local Operation 25 Local Operation 26 NOTE Improve Frequency Accuracy and Stability With HP 5344A Source Synchronizer The 8350B can be used with the HP 5343A Microwave Frequency Counter and the HP 5344A Source Synchronizer to achieve 1 KHz frequency accu
10. One sweeper is used as a local oscillator while the second is used to sweep the desired frequency range See Figure 17 for an example measurement set up using the 8410B with a single 8350B and 83500 series Plug in The 8410B FREQ RANGE should be set to AUTO In addition the sweep time on the 8350B should be slow enough and or sweep range narrow enough to insure phase locking over entire sweep range Local Operation 21 Local Operation 22 8412A 84108 PHASE MAGNITUDE 8350B SWEEP 83500 NETWORK ANALYZER DISPLAY _ OSCILLATOR SERIES PLUG IN D Z AXIS POS Z BLANK BLANK NEGZ BLANK SWP IN SWP IN OUT SOURCE sou CONTROL s PROGRAMMING 1V GHz CONNECTOR 8411A INPUT 8411A HARMONIC 8418 8414 FREQUENCY AUXILIARY POWER SUPPLY POLAR DISPLAY CONVERTER BLANKING 8743A REFLECTION TRANSMISSION TEST SET UNKNOWN pea RETURN Figure 17 83508 Connections to 8410 Notes on connections FREQ REF output of the 83500 or 86200 series Plug ins provides 1 volt per GHz out put so that the 8410B may synchronize with the sweep The 8410B display units 8412 8414A require that the NEG Z BLANK from the 8350B be used as the blanking signal POS Z BLANK from the 8350B line contain the Z axis markers This line connects to the MARKERS input on the 8414A Polar Display and to the Z AXIS input on the 8412A Phase Magnitude Display SWEEP OUT IN outputs a 0 to 1
11. SET the self test completes without errors the instrument presets to SWEEP MODE START STOP over full frequency range of Plug in SWEEP TIME fastest allowable for Plug in MARKERS reset off MODULATION off SWEEP TRIGGER SWEEP INT TIME VERNIER OFFSET 0 MHz DISPLAY BLANKING on SAVE RECALL All SAVE registers remain unchanged All Other Functions off When using 83500 series Plug ins POWER LEVEL maximum specified leveled value RF on Selectable by RF Plug in configuration switch ALC MODE INT CRYSTAL MARKERS off 83522A 83525A B only All Other Functions off Figure 1 Instrument Preset Key 2 of 2 Local Operation Ce SWEEP TRIGGER UNE 566 Olll DATA ENTRY The DATA ENTRY section shown above contains the numeric keyboard terminators 1 GHz seconds dBm step size up down backspace and shift keys This section allows a specific value to be entered for any Frequency Time or power parameter The entry will modify the active function last function selected and must be terminated with the approp riate GHz seconds MHz milliseconds dBm dB Key The step up fe and step DOWN keys allow the active function to be incremented or decremented Step size for fre quency and Power may be changed to any desired value Number unit keys These keys are used to enter values of frequency time or power Holding a number key down causes i
12. STOP SWEEP Input for stopping the progress of a forward sweep When input is 0 to 0 8 volt sweep is stopped RF output is a constant CW frequency Sweep continues when input voltage returns to greater than 2 volts or open circuit Usable with the HP 5343A Fre quency Counter and CNTR TRIG to select and measure frequency points along the sweep FM INPUT Input for frequency modulation or phase lock error signal for the Plug in This input is passed through to the Plug in and processed by the Plug in only See Plug in specifications for frequency deviation and sensitivity AM INPUT Input for external amplitude modulation of the Plug in This input is passed through to the Plug in See Plug in specifications for amplitude input range ALT SWP INTERFACE Connects via cable HP Part No 8120 3174 to 8755C to provide Alternate Sweep function PROGRAMMING CONNECTOR See Figure 20 for pin designation Model 8350B N a Model 8350B Local Operation WARNING CONHECE YAN OPERATOR RME ADLE PARTS INSIDE svovnerce 00 men ODE Eee reins Programming Connector PROGRAMMING CONNECTOR _ Marker Pulse Marker Pulse Request Pen Lift Request Retrace Sweep Alternate Alternate Sweep Stop Fwd Sweep Enable Request Stop Sweep 5 Volt 100 ma MAX Request RF Blanking Digital Ground RF Blank Request Blanking Pulse Ext Trigger Request Input Counter Tri
13. ads GHz MHz or is blank press the TIME key again and the display will read seconds The mainframe can allow sweep times from 100 seconds to 0 01 second although the minimum sweep time is dependent on the Plug in being used and the bandwidth being swept When display reads seconds sweep time can be adjusted with the control knob or number units keyboard The step keys can be used to adjust the sweep time in a 1 2 5 sequence MANUAL SWEEP MAN FREQUENCY TIME display will read GHz MHz By using the FREQUENCY TIME control step keys or number units keyboard it is possible to manually sweep the frequency range with the display indicating the present output frequency EXTERNAL SWEEP EXT The 8350B can be swept via an external voltage Apply 0 to 10 volts into the sweep output input use BNC connector on front or rear panel with input corresponding to the lower frequency limit of the sweep range and 10V corresponding to the upper limit DC sweep input voltages will cause CW frequency outputs Markers and blank ing outputs are disabled when in external sweep mode SWEEP TRIGGER Controls when the sweep will begin in the timed sweep mode The sweep light SWP is lit when the sweep is occurring INT Sweep triggered internally free running LINE Sweep triggered by power line frequency Figure 4 Frequency Time Controls 1 of 3 y Model 8350B Local Operation EXT The sweep can be triggered externally by
14. annel 1 now displays the response due to the current front panel setting while channel 2 ER displays the response to the setting stored in memory location n The front panel controls of the 8350B are enabled and the current sweep setting may be altered if necessary Figure 11 Typical Test Setup Using 8756A 17 Local Operation Figure 12 Frequency Response Test Set 8755S FREQUENCY RESPONSE TEST SET The 8755S consist of 8755C Swept Amplitude Analyzer 182T Oscilloscope 11664A Detectors 3 each 8750A Storage Normalizer The 8755S is used for scalar transmission and reflection measurements requiring up to 60 dB of dynamic range and for absolute power measurement from 50 dBm to 10 dBm The 8350B has the following features designed specifically for use with the 8755S Frequency Response Test Set RF Square wave Modulation By engaging the UI MOD key an internally generated squarewave modulation of the RF output is available thus eliminating the need for external modulating equipment A jumper internal to the 8350B enables the square wave modulation frequency to be changed to 1 KHz see section 5 of the Operating and Service manual for details Alternate Sweep Function The ALTn function of the 8350B allows two different fre quency and power settings to be swept on successive sweeps The front panel setting and the setting stored in a memory register location 1 9 can be selected for alternate sw
15. applying a positive going signal from 0 to 2 volts minimum 20volts maximum The trigger signal must be wider than 0 5 microsecond at less than a 1 MHz repetition rate SINGLE This key selects single sweep mode and aborts present sweep when first pressed Subsequent keying will trigger or abort single sweeps at current sweep time MARKERS Any or all of the five markers through 5 may be enabled by pressing the marker key corresponding to the marker desired When a marker is activated it is set to its last active fre quency unless INSTRUMENT PRESET has been activated in which case the marker will be set to center of the present sweep A marker can be in one of three states ACTIVE Lamp in center of key flashing e ON Lamp on e OFF Lamp off The five mainframe markers are available in two forms Intensity and Amplitude Intensity markers are active any time a marker is selected These markers are available at the Positive Z axis output rear panel BNC and appears as intensified dots on a display Amplitude markers are only on when the AMPTD key has been pressed Amplitude marker circuitry is internal to the 8350B mainframe and RF Plug ins and causes dips in the RF output power at the selected marker frequencies Only one marker at a time the active marker can have its value altered Pressing any marker key makes that marker active When a marker is active the keyboard FREQUENCY TIME control
16. ation Then turn off channel 2 by releasing its display pushbuttons Turn on Channel of the 8755C and set the function dB DIV and Offset as desired Set 8350B controls as desired Turn on Channel 2 Press ALTn n and the 8350B will alternate between the two set tings On successive sweeps Channel now displays the response due to the current front panel setting while channel 2 displays the response to the setting stored in memory location n The front panel controls of the 8350B are enabled and the current sweep setting may be altered if necessary Figure 15 Typical Test Setup Using 8755S 20 p D Model 8350B Figure 16 Frequency Response Test Set 8410B NETWORK ANALYZER The 8350B is compatible with the 8410B Network Analyzer systems and accessories The Source Control Cable HP P N 08410 60146 synchronizes the two instruments to provide continuous multi octave coaxial magnitude and phase measurement capability from 110 MHz to 18 GHz with 65 dB dynamic range The frequency markers can be displayed in polar format as intensity dots Z axis Frequency markers derived from crystal oscillators allow frequency measurements to be made with an accuracy of five parts per million Waveguide measurements between 18 and 26 5 GHz can be made with the K8747A Reflection Transmission Test Unit which is designed for use with the 8410B This test sys tem utilizes two 8350B Sweep Oscillators and 83570A 18 to 26 5 GHz RF Plug ins
17. eeps The Alternate Sweep Function will not work properly with the 8755A or 8755B See Figure 13 for a sweep display of the ALTn function when used with a bandpass response at different resolutions and offsets Model 8350B a Mode 8350B Local Operation 0 25 dB DIV 10 dB DIV Figure 13 Alternate Sweep Function Display Some other features enhancing the convenience and versatility of the 8755S are Marker A The MKR A function increases trace intensity between the Active and the pre viously Active markers The 8750A Storage Normalizer will need to be in BYPASS mode to view Z axis modulation on the oscilloscope Power Sweep The RF output power may be ramped up when the sweeper is in the swept or swept CW mode by using the POWER SWEEP function See Figure 14 for a gain com pression display using power sweep Save and Recall This function allows the storage and recall of nine complete instrument settings GAIN dB 2 4 6 8 10 12 14 16 18 20 POWER IN dBm Figure 14 Gain Compression Display Figure 15 outlines the general procedure used in making a scalar transmission and reflec tion measurement The 11692D Dual Directional Coupler is used in the example but if an 11666A Reflectometer Bridge is available it may be used instead of the Coupler and two detectors 8755S Option 002 To keep the following procedure brief the 8750A will not be used switched to BYPASS in the proced
18. ent setting press RECALLn and 1 or 9 The STEP keys may be used to step through the stored registers The instrument settings stored in memory may be recalled remotely in sequence by using the Step Up Advance on pin 22 of the Aux iliary Program connector on the rear panel of the 8350B A contact closure to ground or logic 0 is used to implement this function SAVE REGISTER LOCK All Save Registers may be write protected locked by pressing SHIFT SAVEn This com mand makes it impossible to change the contents of any register until it is unlocked by pre ssing SHIFT RECALLn Since the 8350B memory is non volatile the contents of the Save Registers and the locked unlocked status are retained even with Line power off If a SAVEn command is attempted after SAVE LOCK is engaged an Error 30 E030 is displayed ALTn ALTn causes the 8350B to alternate between the current instrument state and the setting stored in memory location n where n 1 9 on sucessive sweeps When the 8350B is in this mode the lamp will be on and the SAVE and RECALL keys disabled To exit from the ALTn mode press the key again the lamp will turn off and the SAVE RECALL keys will become operational When using the 8350B with an HP Swept Amplitude Analyzer channel 1 displays the current instrument state and channel 2 displays the stored setting provided the 8350B ALT SWP INTERFACE cable is connected to the analyzer Figure 5 Save n Recall n and ALT Ke
19. entered sweep value is the upper sweep limit Press the POWER SWEEP key again to turn the power sweep off Figure 7 Plug in Controls 1 of 2 Local Operation 13 Local Operation 14 Signal Control RF ON OFF Turns the RF power on and off CW FILTER ON OFF When on this filters the internal oscillator s tuning voltage to pro vide a more stable CW output During swept operation this filter is always disabled ALC Automatic Level Control Mode INT EXT MTR INT Provides internal leveling of output power at the output connector The 83500 series Plug in must be on INT leveling for calibrated output power EXT This setting is used when leveling with an external crystal diode detector The front panel EXT ALC input accepts negative voltages in the 25 to 250 millivolt range typically MTR Used when leveling output power with an HP 432A B C Power Meter CAL Adjusts the ALC gain so the display can be calibrated by an external power meter or detector CRYSTAL MARKERS 83522A 83525A B Plug ins only 50 10 and 1 MHz crystal frequency marker combs are available The 50 and 10 MHz are available in band 0 while the 1 MHz markers are available under GHz AMPTD INTENS The markers can be set to be amplitude dips on the RF output and or intensified spots on the Z axis of the CRT or both They are independent of the mainframe markers EXT External Marker An external frequency marker can be input throug
20. erating and Service manual for details Alternate Sweep Function The ALTn function of the 8350B allows two different fre quency and power settings to be swept on successive sweeps The front panel setting and the setting stored in a memory register location 1 9 can be selected for alternate sweeps See Figure 9 for a sweep display of the ALTn function when used with a bandpass response at different resolutions and offsets Local Operation Local Operation 0 25 dB DIV 10 dB DIV Figure 9 Alternate Sweep Function Display Some other features enhancing the convenience and versatility of the 8756A are Marker A The MKR A function reduces the trace intensity between the Active and the previously Active Markers Power Sweep The RF output power may be ramped up when the sweeper is in the swept or swept CW mode by using the POWER SWEEP function See Figure 10 for a gain com pression display using power sweep Save and Recall This function allows the storage and recall of nine complete instrument settings GAIN dB 8 10 12 14 16 18 20 POWER IN dBm Figure 10 Gain Compression Display Figure 11 outlines the general procedure used in making a scalar transmission and reflec tion measurement The 11692D Dual Directional Coupler is used in the example but if an 11666A Reflectometer Bridge a 85020A B or a 85021 A B Directional Bridge is available it may be used instead of the Coupler and t
21. gger Pen Lift Step Up Recorder Mute Advance Inverse Pen Lift 8410 Ext Blanking Trigger Negative Logic True is logical D Input Positive Logic O Output Figure 20 Rear Panel Connections 27 Local Operation 28 APPENDIX 2 86200 SERIES PLUG INS WITH 11869A ADAPTER FIGURE 21 Connecting 118694 Adapter to 86200 series Plug in Although designed for the 8620 Sweep Oscillator the 86200 series RF Plug ins can be used in the 8350B Sweep Oscillator with the addition of the 11869A Adapter The 11869A Adapter provides the electrical and mechanical interface between the 8350B and an 86200 series Plug in A switch on the 11869A allows the user to select the appropriate interface code from the code listing on the adapter so that an 86200 series Plug in can be used in the 8350B mainframe All of the standard performance and control of the 8350B is available when using an 86200 Plug in with the 11869A Adapter However Plug in functions e g output power RF on off Plug in markers will not be programmable and will not respond to keyboard and step keys On the rear panel of the 11869A Adapter are several hole plugs that allow connection to be made to the back panel of the Plug in 11869A Option 004 provides two semi rigid cables to allow connection of 86200 series rear panel output to 11869A rear panel output Special Plug ins Plug ins with Option HXX When using 86200 series Plug ins that have bee
22. h the rear panel of the Plug in The marker appears when the RF output frequency equals the marker frequency The external marker input power should be between 10 dBm and 10 dBm MKR Lamp When the 8350B is in CW or manual external sweep mode the MKR Lamp will light when the CW frequency is at a marker frequency Useful when an accurate CW frequency reference is desired and to calibrate Plug ins RF OUTPUT CONNECTOR Type N female The 83570A 18 to 26 5 GHz Plug in is equipped with a WR 42 waveguide output connector Figure 7 Plug in Controls 2 of 2 Model 8350B 0 Model 8350B HEWLETT PACKARD _0n0 OCO ere O o Figure 8 8756A Scalar Network Analyzer INTERFACING THE 8350B WITH SPECIFIC MEASUREMENT EQUIPMENT 8756A SCALAR NETWORK ANALYZER The 8756A is used for scalar transmission and reflection measurements with 60 dB of dynamic range for ratio measurements and absolute power measurement from 50 dBm to 10 dBm The 8350B has the following features designed for use with the 8756A Scalar Network Analyzer RF Square wave Modulation By engaging the key an internally generated squarewave modulation of the RF output is available thus eliminating the need for external modulating equipment A jumper internal to the 8350B enables the square wave modulation frequency to be changed to KHz see section 5 of the Op
23. isplay to read the vernier value in MHz 1 50 light is on whenever a frequency vernier or frequency offset is present in any mode After setting vernier to return to the previous mode press the appropriate key e g START etc and the display will return to reading the appropriate frequen cies and the lt 0 lamp will be lit Frequency vernier can be set by the control knob Data Entry keyboard or step keys The displayed vernier adjustment can be up to 0 05 of the frequency band being swept When in a sub band of a multiband Plug in for example the 0 01 2 GHz band of the 83525A 01 8 4 GHz Plug in the adjustment range will be 0 05 of the sub band This feature allows for better frequency resolution than would otherwise be possible with the vernier when using a multiband Plug in The vernier adds its value to the appropriate frequency parameter and then resets the vernier to zero when the adjustment exceeds 0 05 for continuous adjustment ZEROING VERNIER To set the vernier to zero press VERNIER 0 MHZ ms and the 0 lamp will turn off FREQUENCY OFFSET The frequency offset feature allows the CW frequency and or the effective center frequency of the swept range to be shifted by any amount up to the full range of the Plug in 1 To enter an offset press SHIFT VERNIER and enter the offset by either the left FREQUENCY control or data keyboard The amount of offset in GHz or MHz will be shown
24. n factory modified for a non standard frequency range a PROM obtained from the factory must be used in the 11869A Adapter The PROM is inserted in the 16 pin socket on the PC board of the adapter and is needed for proper interfacing and controlling of a non standard plug in Model 8350B Model 8350B Local Operation APPENDIX 3 FRONT PANEL CONTROLS SUMMARY Vernier Offset Vernier function offsets sweep ranges CW or CF frequencies 0 lamp lit when non zero offset or vernier present Right Frequency Control Adjusts AF or STOP frequency Right Frequency Display Displays STOP or AF frequency in GHz or MHz MKR A Allows user to display frequency difference between any two markers and intensifies the appropriate portion of the dis play Frequency Time Display Display Marker or manual sweep frequency in GHz or MHz Sweep Time in seconds and HP IB address Markers Controls the five independent mainframe supplied frequency markers Save n Recall n Alt Can save and recall up to nine different settings Data Entry Keyboard Can enter exact values or step sizes for most sweep parameters via the keyboard Output Controls Can control marker dis play mode RF and display blanking and internal square wave modulation of the RF output 10 Sweep Mode Selects External Manual or Timed sweep mode MARKER SWEEP Causes Marker fre quency to temporarily become start of
25. n this key is pressed the frequency of the active marker becomes the center frequency of the swept output The frequency span remains unchanged if it is within the frequency limits of the Plug in If the original frequency span exceeds the Plug in limits frequency span will be reduced to retain symmetry MKR A This function allows the frequency difference between any markers to be displayed and the trace between them intensified if intensity markers are selected 1 Press SHIFT M1 the display shows the frequency difference between the currently active marker and the one that was previously active The FREQUENCY TIME control DATA ENTRY keyboard or step keys can change the active marker value To exit MKR A mode press OFF Example Press M4 and set frequency via DATA ENTRY or Control Knob to 2 GHz Press M2 and set frequency via DATA ENTRY or Control Knob to 2 4 GHz Press SHIFT MKR A Note Frequency Time display reads difference between marker 4 and marker 2 400 MHz Figure 4 Frequency Time Controls 3 of 3 10 2 Model 8350B SAVEn RECALLn ALTn SAVEn RECALLn The 8350B is equipped with memory registers which allow up to nine complete front panel settings frequency range markers power level etc to be stored and later recalled Instru ment settings are stored in memory locations 1 through 9 by pressing SAVEn and 1 9 To recall a stored instrum
26. quency AF Both the CF and AF can be changed via the appropriate control knob number units keyboard or step keys CW When the CW function is activated the 8350B outputs a constant frequency The value of the CW frequency is displayed on the left FREQUENCY display The CW frequency is always the same as the center frequency CF of the CW AF swept range The CW frequency value can be changed using the control knob data entry keyboard or step keys In CW mode the SWEEP OUT voltage is equal to a percentage of the full band Pressing SHIFT CW enters a swept CW mode with the SWEEP OUT being a 0 to 10 volt ramp that results in the display trace being a flat horizontal line This is often useful when reading values e g dB of attenuation from a CRT screen when at a CW frequency Figure 3 Frequency Controls 1 of 2 Model 8350B CW Fine Coarse Control Knob Resolution CW control knob resolution is coarse when CW mode is activated after an INSTRUMENT PRESET To change from coarse control knob resolution 0 0015 of band 16 384 points to fine resolution 0 00038 of band 262 144 points press SHIFT AF To return to coarse control knob resolution press SHIFT CF FREQUENCY VERNIER The effective center frequency of any mode CW or swept may be adjusted with high resolu tion up to 0 05 of the frequency band being used with the vernier Pressing the VERNIER key activates the function and sets the left FREQUENCY d
27. r SWEEP TIME cannot be entered and always increments in a 1 2 5 sequence The step keys affect the last active func tion The entered Step Size is not displayed Example To set a 250 MHz step size Press STEP SIZE 2 5 0 MHz ms After this each time the UP or DN key is pressed the active frequency parameter will change by 250 MHz SHIFT key BLUE This key is used to activate the functions coded in blue on the front panel and other special SHIFT functions are also explained on the pull out information card The lamp in the cen ter of this key is on when the key is active Example To activate all 5 frequency markers Press M1 M2 M3 M4 M5 To turn off all 5 frequency markers at once Press SHIFT OFF this activates the markers ALL OFF command The SHIFT key is also used to set the HP IB address Press SHIFT LCL the FREQUENCY TIME display will indicate the present HP IB address number The address may be changed to any value between 0 and 30 by using the keyboard to enter a number and the GHz MHz or dBm key as a terminator It does not make any difference which of the terminator keys is pressed The 8350B is factory preset for an HP IB address of 19 NOTE Address number 21 is normally reserved for calculator addressing and HP IB interface functions and should not be used Figure 2 Data Entry 2 of 2 Local Operation Model 8350B CIC HA 666 AL ee CE Q TI
28. racy with 1Hz frequency resolution in a CW mode Analog swept frequency accuracy can also be improved by the wideband Lock and Roll techniques and narrowband 40 MHz phase lock sweep capabilities controlled by the 5344A Source Synchronizer Added stability is possible by phase locking the 8350B RF output to the 10 MHz time base crystal of the 5343A Counter For more information see a HP 5344S Source Synchronizer data sheet or Operating and Service Manual APPENDIX 1 REAR PANEL CONNECTIONS For a diagram of the rear panel see Figure 20 POS Z BLANK Positive Z axis blanking signal Supplies a rectangular pulse of approx imately 5V into 2500 ohms during the retrace and bandswitch points of the RF output Also supplies a 4V 8 volts for active marker pulse when the RF is coincident with a marker frequency if intensity markers are selected NEG Z BLANK Negative Z axis blanking signal Supplies a negative rectangular pulse SV into 2500 ohms during the retrace and bandswitch points of the RF output PEN LIFT Output to control the pen lift function of an X Y recorder Maximum pen up level is 40V and maximum pen down sink current is 150 mA at 0 7V SWEEP OUT IN Wired in parallel with sweep out in BNC connector on front panel See Display Functions Control group for a description CNTR TRIG Counter Trigger HP 5343A Frequency Counter only Output for controlling the external trigger input of the HP 5343A frequency counter
29. requency The display and RF blanking must be off when externally sweeping DISPLAY FUNCTIONS FOR FREQUENCY MULTIPLIER OR UP CONVERTER INTERFACE Two SHIFT functions located in the Frequency section of the front panel allow the actual RF output frequencies to be displayed when a frequency multiplier or frequency up converter is used DISPLAY MULTIPLIER This function is activated by pressing SHIFT START n GHz The possible values for range from 0 to 99 allowing the appropriate integer multiplier to be entered This integer n multiplier typically 2 or 3 does not affect the RF output of the 8350B but simply allows the Frequency LED displays to automatically show the final RF output when a frequency multiplier is used DISPLAY OFFSET This function is activated by pressing SHIFT STOP n GHz The possible values for n range from 0 999 GHz enabling an appropriate Frequency LED display offset to be entered This display offset does not affect the 8350B RF output but only allows the Frequency LED displays to automatically show the final RF output when a frequency up converter is used Figure 6 Display Function Keys Model 8350B EA x Model 8350B 2008 sweer oscniaton INTENS ALC MODE SG 666 0 o Be 1 Sd GO 83500 SERIES PLUG IN Power Control POWER LEVEL When the POWER LEVEL key is pressed the Plug
30. sweep Marker 2 frequency to become stop of sweep Sweep Trigger Determines how sweep will trigger MKR CF Causes center frequency of sweep to be shifted to the frequency of the currently active marker Line switch Turns on off 8350B mainframe and plug in Instrument Preset Selects a pre determined instrument state START CF CW AF STOP Sweep mode keys Selects mode of output and display Left frequency Control Adjusts START CW CF VERNIER or OFFSET Left Frequency Display Displays START CW CF VERNIER or OFFSET frequency in GHz or MHz depending on mode selected plus self test error codes Figure 18 Front Panel Controls 29
31. t to repeat Example To enter a START frequency of 1 870 GHz Press START 1 8 7 GHz s START 1 8 7 0 MHz ms to enter the equivalent frequency in MHz Backspace Key BK SP Prior to pressing a units key the value entered from the keyboard may be changed via the BK SP key without effecting the current instrument state The back space key allows the user to alter digits already entered Holding down the Backspace key causes it to repeat Step UP and Step DOWN keys These keys increment or decrement the active function including memory registers by the STEP SIZE or preset amount By holding either key down the 8350B will continue to step Figure 2 Data Entry 1 of 2 Model 8350B Model 8350B Local Operation therefore eliminating the need for the user to repeatedly press the step keys The STEP UP function may be engaged via the remote STEP UP ADVANCE on the rear panel AUX PROGRAMMING connector The STEP UP ADVANCE is incremented by supplying con tact closure to ground or logical 0 to pin 22 STEP SIZE Entering a frequency or power increment to be used with the UP or DOWN key The STEP SIZE key is pressed before the quantity is entered A frequency step that is entered is com mon for START STOP CF CW MARKER and MANUAL SWEEP functions A power step is used for varying POWER LEVEL Default values are assigned at instrument preset for step sizes until new values are entered Note that a step size fo
32. ted points Pin 11 on the 8350B Auxiliary Program Connector PEN LIFT REQUEST Allows a pen lift to be initiated by remote control indepen dent of the present pen lift status Pin 3 on the 8350B Auxiliary Program Connector INVERSE PEN LIFT Inverse function of Pen Lift pin 23 on 8350B Auxiliary Pro gram Connector The pen lift control line is assigned to a pin on the Remote Control connector of the X Y recorder For a complete pin assignment listing refer to the Operating Manual for the par ticular X Y recorder being used Pen lift pin location on X Y recorders 7010B 7015B 3 7035B 18 7004B 7034A 18 7044A 45A 47A 1 7046 34 Local Operation 23 Local Operation 6343A MICROWAVE FREQUENCY COUNTER we Lert 900 COM a ANA pe N 108 D Figure 18 5343A Microwave Frequency Counter 5343A FREQUENCY COUNTER The 5343A Microwave Frequency Counter can be used with the 8350B to measure frequen cies in swept mode in addition to normal CW frequency measurements During swept operation the 5343A will stop the 8350B sweep and count a selected frequency parameter such as the START frequency STOP frequency or any frequency markers in the sweep range To accomplish this the 8350B and 5343A communicate via two signal lines Counter Trigger Stop Sweep on the 8350B and Sweep Interface A and B on the 5343A that enable the 8350B to externally trigger the 5343A and then allow the
33. until the dis play reads 4 5 dBm At GUO 2 2 GOA Ge jee SWEEP TRIGGER Ww a THERON OUTPUT INSTRUMENT PRESET This condition occurs when the INSTR PRESET key is pressed Turning the 8350B on or performing an INSTR PRESET causes an internal self test to occur Only after the INSTR PRESET command will the instrument be set to the preset con dition If certain internal errors or failures are detected during the self test or during normal operation they will be indicated via error codes in the form Ennn where n 0 7 9 read from the left FREQUENCY display For a complete description of the error code listing see the Operating and Service Manual Section 8 The error codes are E001 Plug in interface failure Check Plug in E002 Sweep voltage DAC Marker voltage DAC failure E003 Tuning voltage DAC Marker voltage DAC failure Figure 1 Instrument Preset Key 1 of 2 Model 8350B Model 8350B Local Operation Power supply failure Instrument interface bus failure Front panel bus failure ROM failure ROM failure ROM failure ROM failure RAM failure RAM failure RAM failure RAM failure Microprocessor failure Insufficient cooling Check air filter and fan A SAVEn Command has been attempted when the SAVE Lock is engaged E050 to E099 Plug in failure Refer to appropriate Plug in manual for troubleshooting information If after INSTR PRE
34. ure The following anomalies exist when using the 8750A with the 8350B Sweep Oscillator The 8350B DISPL BLANK must be engaged to ensure triggering 8750A updating Intensity markers are changed to amplitude markers In MKR A mode they appear as a level shift over the MKR A range Local Operation Model 8350B If an 8755 channel is switched off the trace goes to the reference line bottom of CRT N Example 1 Connect the equipment as shown in the diagram below Initially the 8350B should be set by pressing INSTR PRESET LJ MOD Set to 27 8 KHz which will set the front panel instrument state and activate the internal square wave modulation 83508 SWEEP 83500 OSCILLATOR SERIES PLUG IN 182T OSCILLOSCOPE O ogo 7 POS 2 BLANK ALT SWP INTERFACE 8755C SWEPT AMPLITUDE ANALYZER 11664A C _ 116920 COAXIAL DUAL DIRECTIONAL COUPLER J REFLECTED CA Notes on connections Either the front or rear panel SWEEP OUT IN may be used When in ALTn mode both channels 1 and 2 on 8755C must be on and receiving inputs Turn off channel 1 on the 8755C by releasing the display pushbutton Set the 8350B controls as desired and set MOD on On channel 2 set the function dB DIV and Offset desired for viewing the current sweep setting Set the 8350B controls as desired then store the current 8350B sweep setting in any available memory loc
35. wo detectors For more information and additional features of the 8756A with the 8350 refer to the Operating Section of the 8756A Operating and Service Manual Model 8350B gt Model 8350B Local Operation Example 1 Connect the equipment as shown in the diagram below Initially the 8350B should be set by pressing PRESET on the 8756A The sweep time will be set to 150 ms the 8350B internal square wave modulation and the 8350B INSTR PRESET will be activated 8756A 8350B SWEEP 83500 8756A SCALAR SYSTEM OSCILLATOR SERIES PLUG IN NETWORK ANALYZER INTERFACE STOP SWEEP 116920 COAXIAL DUAL DIRECTIONAL COUPLER Notes on connections Either the front or rear panel SWEEP OUT IN may be used When in ALTn mode both channels and 2 on 8756A must be on and receiving inputs Turn off channel on the 8756A by pressing SHIFT MEAS RATIO Set the 8350B controls as desired On channel 2 set the function dB DIV and Offset desired for view ing the current sweep setting Set the 8350B controls as desired then store the current 8350B sweep setting in any available memory location Then turn off channel 2 of the 8756A by pressing the SHIFT MEAS RATIO pushbuttons On Channel of the 8756A set the function dB DIV and Offset as desired Set 8350B controls as desired Turn on channel 2 Press ALTn n and the 8350B will alternate between the two set tings On successive sweeps Ch
36. ys Local Operation Local Operation 12 HE FREQUENCY TIME Bam i Q maas w DISPLAY FUNCTIONS FOR ANALYZER INTERFACE AMPT MKR DSPL BLANK RF BLANK Function in effect when lamp in center of key is lit DSPL BLANK ON OFF Blanks the display during the retrace via the POS Z BLANK or NEG Z BLANK outputs RF BLANK ON OFF Blanks turns off the RF power during the retrace U MOD ON OFF Activates the internal 27 8 KHz square wave amplitude modulation of the RF output This feature makes the 8350B directly compatible with the HP 8756 and the HP 8755 Scalar Network Analyzers The 8350B may be modified via an internal jumper to provide 1000 Hz square wave amplitude modulation for instruments like the HP 415E SWR Meter refer to the Operating and Service Manual Section 5 SWP Sweep OUTPUT SWP Sweep INPUT BNC connection SWP Sweep OUTPUT Supplies a 0 to 10 Volt signal when 8350B is in MAN or TIME sweep mode OV output is at the start frequency of sweep 10V output is at the stop frequency of sweep In CW mode the output is a de voltage proportional to the percent of the band This can be used to drive the X axis on a CRT or X Y recorder SWP Sweep INPUT Used when in EXT sweep mode Supplying a voltage will tune the RF where 0 volts tunes to the lower frequency of the set sweep and 10 volts tunes to the upper frequency The input can be a ramp for a swept output or DC for a CW f
Download Pdf Manuals
Related Search