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85640A Operation Manual

1. 500 MHz 10 5V CHz BLA KING INPUT p INPUT INPUT u o me OUTPUT qu LN o WiR1 TRACKING wiR2 LEVEL ADJUST VERNIER mE P O J2 Em p o J2 J7 Je WIDS2 UNLEVELED P O J1 500 IO UNLEVEL e o v2 gt 600 MHz DETECTOR CONVERTER I I POWER Jt A4W2 A3 INTERFACE suppLy ES as ASSEMBLY i5 Lo NN EN m P O J1 o mH l 2 P O st IP t P o w2 WS P O W2 P O w2 _ m m P O dt AD TRACKING E A pwr tvi PO 9 ace mon GENERATOR if C W3 EXT ALC Ex BIAS BOARD 1 p INPUT Ud 28 600 MHz A UPCONVERTER s 10 2 8 GHz 182 14 MHz M ENTUPLER OUTPUT MXR MES x2 s X5 boy J2 w10 IP O J1 VOU 91 07 MHz A I MODULATOR 782 14 MHz 3 9107 MHz V n wa Lo TRACKING INPUT OSCILLATOR J3 COUPLER o o o A E IAT T AS LINE FILTER i i I SWITCH ASSY POWER 3 ATTENUATOR p po M RF OUTPUT l EN L sem sve TEE i LINE ATTENUATOR AA4WT l m pum I A4 POWER SUPPLY A4W2 TO a3 HP 85640A TRACK ING _ Ll Ll GENERATOR l wk248 Figure 7 9 Simplified HP 85640A RF Tracking Generator Block Diagram 7 2
2. J6 r J7 LI LII A RE lo LL LE q E o lho o Falta ca H CREE uM BE ele Le El Ra FI ns jS R7 TP4 E p ex m TT TTT c TTT Tyo TT l SUM Ll LL Ll LLL LJ L1 a RE LILIA u7 Sig ue L 5 us IEEE Es sis e riter EE ELS IE S s Saiz lee ASE SEE 8 TT LOLA TT FTTT TTTTTT Su e c A JL a Sg SL te4t rP7J Lrpe o 2 T ph Risk RIE RIT H RIO H 4 E30 u10 A 2804 53 R4i A Ri2h TEE l L L a LLL a S mI EIN 55 ro SL EI Ie q Tig T g 8 T amp T T TP3 T Tp2 l Lo a GMD J4 h E ud BHD T T E u1 1 1 1 1 e m 2 5 CA Lola l PTIT TTG us wk234 Figure 5 6 Power Level Adjustment and Test Point Locations Equipment Host spectrum analyzer HP 8560A E HP 8561A B E HP 8562A B or HP 8568A E Measuring receiver DENEN HP 8902A Power sensor eseeeeeee ee he e e ean HP 8482A Digital voltmeter sees RR e an HP 3456A Ball driver 0 05 in 2 0 hr HP 8710 1199 Cables Type N 62em 24 in lseeseeeeeeeeee e hen HP 11500B C BNC 62 cm 24 in 8 required 6 0 cen tenets HP 8120 1839 SMA 52 em 20 in 2 ce rs HP 5061 9038 Test lead kit ccc cee cee cence eee nee hh HP 34118A Procedure 1 Remove the tracking generator cover refer to Removing and Replacing the Instrument Cover in Chapter 7 Connect the equipment as shown in Figure 5 5 with
3. A pum C L wk249 Figure 3 3 Tracking Generator to Host Analyzer Front Panel Connections HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 5 WARNING O La VIDEO EXT TRIG BLANKING OUTPUT INPUT OUTPUT SWP 0 5V GHz 10 MHz REF ALG OUTPUT IN OUT NEU ol O09 WARNING FUSE wk212 Figure 3 4 Tracking Generator to Host Analyzer Rear Panel Connections When you have made these connections select the 0 5 V GHz output on the spectrum analyzer m On an HP 8561A or HP 8562A D select SWEEP REAR PNL OUTPUT 5V GHZ FAV E On an HP 8560A E HP 8561B E or HP 8563A E press AUX CTRL REAR PANEL 5V GHZ FAV To view the tracking generator s output connect the tracking generator s RF OUTPUT directly to the host spectrum analyzer s INPUT 509 connector The spectrum analyzer should be tuned between 300 kHz and 2 9 GHz within the specified range of the tracking generator R On an HP 8560E HP 8561E or HP 8563E press GATE OFF 3 6 Operation HP 85640A RF Tracking Generator Operation and Service Manual Measurement Overview A spectrum analyzer combined with a tracking generator forms a stimulus response measurement system With the tracking gen
4. 6 PLACES 9 3 1 2 5 PLACES 8 6 wk244 Figure 7 5 A3 Interface Board Assembly Replacement HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 13 A4 Power Supply Replacement Caution The tracking generator assemblies are static sensitive Perform assembly procedures at static safe work stations Refer to Figure 7 1 for an example of a static safe work station Note If replacing only the power supply board assembly not including A4W1 and A4W2 remove the jumpers between the transformer terminals marked 1 and 3 and 2 and 4 Removal 1 Remove the instrument cover as described on page 7 7 2 Remove the four screws two per side from the power supply shield See Figure 7 6 3 Remove the cables from the cable clips Q on the power supply shield 4 Remove the three screws 3 connecting the power supply shield to the chassis Remove the shield 5 Depress the clips on the sides of ASW1P1 connector between A5W1 and A4W1 to disconnect the cables 6 Remove the three screws from the back panel and lower the rear frame 7 Desolder the two wires 7 on the ALC switch making note of the proper connections Lift the switch out of its slot 8 Clip the two cable ties 9 to free A4W2 cable assembly and disconnect it from A3J3 Remove the four screws and that secure the power supply bracket to the
5. RF INPUT 4 s0o0o0o oom oo 0000 a e s CAL OUT ADAPTER BNC CABLE wk226 Figure 4 7 LO Feedthrough Test Setup HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 25 6 LO Feedthrough Amplitude Equipment Host spectrum analyzer HP 8560A E 8561A B E HP 8562A B or HP 8568A E Microwave spectrum analyzer seseeeee e ae HP 8566A B Cables Type N 62 em 24 in 2 required eese HP 11500B C BNC 62 cm 24 in 3 required 6 0 6 cette tne nen 8120 1839 SMA 52 cm 20 in 2 cc ene cent teen eens 5061 9038 BNC 28 em 8in 2 ee rns HP 10502A Adapters Type N m to BNC TP 1250 1476 Procedure 1 Connect the equipment as shown in Figure 4 7 Use the type N cable to connect the tracking generator s RF OUTPUT to the host spectrum analyzer s INPUT 50Q 2 Press PRESET on the host spectrum analyzer and set the controls as follows CENTER FREQ 2 0 ec Ir hera 300 MHz DD a OA 0 Hz RES A A 300 Hz 3 If the host spectrum analyzer is an HP 8561A HP 8562A or HP 8562B press SWEEP REAR PNL OUTPUT 5 V GHz FAV If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press AUX CTRL REAR PANEL 5 V GHz FAV 4 On the tracking generator set the OUTPUT LEVEL vernier knob to 5 dBm Set the OUTPUT LEVEL attenuator knob to O dB then adjust TRACKING ADJUST to displ
6. 2 2 2 2 2 2 2 2 25 25 2 52 4 2 2 Is the Shipping Container in Good Condition 2 2 Save the Packaging Materials a a a 2 2 Preparing the RF Tracking Generator for Use llc len 2 2 Power Requirements 4 2 ee 2 3 Setting the Line Voltage Selector Switch ls 2 4 Checking the Fuse ll ll a 2 b Power Cable l l ll l4 4 a 2 b Connecting an HP 85640A to a Compatible Spectrum Analyzer 2 7 Turning On the Tracking Generator ee ee lr 2 8 Sales and Service Offices 2 1 ll lle 2 9 3 Operation What You ll Find in This Chapter 2 llle 3 1 Front Panel Features 4 2 4 4 l l 4 4 44 9 2 Rear Panel Features 4 4 4 4 4 4 4 4 ss 9 4 HP 85640A and Host Spectrum Analyzer Connections 3 5 Measurement Overview 4 4 4 4 4 4 444A 3 7 Making a Stimulus Response Measurement 2 2 2 2 2 3 7 Equipment Needed 2 1 a a 3 8 Transmission Measurements a ll ee 44s 3 9 HP 85640A RF tracking Generator Operation and Service Manual Contents 1 Contents 2 Making a Transmission Measurement Using an HP 8560A E HP 8561B E or HP 8563A E Spectrum Analyzer s leen 3 9 Set up the System 2 ll 4 4 eh 3 9 Calibrate 4 2 2 2 ll s 4 4 4 4 as 3 15 Normalize 2 2 2 a 3 17 Measure 5 2
7. 3 12 3 10 Adjusting the Spectrum Analyzer for Measurement Requirements 3 12 3 11 Decrease Resolution Bandwidth to Improve Sensitivity 3 13 3 12 Using Tracking Adjust to Compensate for Tracking Error 3 13 3 13 Tracking Error aoaaa 4 e As 3 14 3 14 Guided Calibration Prompt 2 a 3 15 3 15 Thru Connected for Guided Calibration Routines 2 3 16 3 16 Display of Thru Reference Trace in TraceB 040 3 17 3 17 Normalized Trace 4 2 4 4 s s 4 4 4o s 3 18 3 18 Measuring Rejection Range with Delta Markers 3 18 3 19 NORM REF LVL Adjusts the Trace and Retains Analyzer Settings 3 19 3 20 RANGE LVL Increases Dynamic Measurement Range 2 2 2 3 19 3 21 Tracking Generator Power over Specified Frequency Range 3 21 3 22 System Setup for Transmission Measurement 3 22 3 23 Display of DUT Response 2 2 s s s e es 3 22 3 24 Adjusting the Spectrum Analyzer for Measurement Requirements 3 23 3 25 Decrease Resolution Bandwidth to Improve Sensitivity 9 24 3 26 Using TRACKING ADJUST to Compensate for Tracking Error 9 24 3 27 Tracking Error 3 25 3 28 Thru Connected for Calibration Routine 8 3 26 3 29 Display of Thru Reference Trace in TraceB 040 3 27 3 30 Normalized Trace 2 4 s 4 4 4 os
8. 2 2 2 00482 7 17 7 8 Simplified HP 85640A to Host Spectrum Analyzer System Block Diagram 1 19 7 9 Simplified HP 85640A RF Tracking Generator Block Diagram 1 20 HP 85640A RF Tracking Generator Operation and Service Manual Contents 5 Tables 2 1 Host Spectrum Analyzer to Tracking Generator Compatibility 2 1 2 2 Operating Power Requirements ll l l n 2 3 2 3 Hewlett Packard Sales and Service Offices lll n 2 10 3 1 Front Panel Interconnections 4 4 ll 4 4 4 44e h 3 2 3 2 Rear Panel Interconnections 4 ll 4 4 44e 3 4 3 3 HP 85640A and Host Spectrum Analyzer Connections 3 5 4 1 Performance Tests 2 ll e ll 4 4 s 4 2 4 2 Recommended Test Equipment 2 2 2 2 2 25 25 2 2 2 4 4 4 3 Output Attenuator Accuracy 2 a a 4 8 4 4 Flatness Relative to 300 MHz ll leeren 4 15 4 5 Harmonic Spurious Outputs lll ls 4 18 4 6 Fundamental Response Amplitudes 4 23 4 7 Non Harmonic Spurious Responses ls 4 24 4 8 Tracking Generator Feedthrough llle 4 31 4 9 Performance Test Record Page lof 3 4 35 4 9 Performance Test Record Page 2 of 3 2 2 4 36 4 9 Performance Test Record Page Bof 3 4 37 5 1 Adjustment Procedures and Equipment Used 2 5 2 5 2
9. Gogo ooooo c3 GO GOGO DH G O ooooo ooo 0O QE 8 cogoge 1ST LO OUTPUT INPUT 50 0 SMA CABLE OUTPUT CAL ADAPTER gu 62cm BNC CABLE wk231 Figure 5 3 600 MHz Level Adjustment Setup HP 85640A RF Tracking Generator Operation and Service Manual Adjustment Procedures 5 7 2 600 MHz Level Adjustment AS INTERFACE ASSEMBLY 85640 60001 J6 R35 R34 J7 R6 H Leio EB l m T R3 m R32H CT R7 H R29 us R26 H 1 Z J1 o T TH ey a C T 1C20 C28 4029 Te b R56H 9 Lo a 12 RNL Rig Ris RI ARO H 4030 A 2904 53 ARa H Rh TP5 4 Rag H E25 Iae TPI A3J5 ASU4 wk 32 Figu
10. L 0 INTERFACE ASSEMBLY O ATTENUATOR f LEE AS ph x wk230 Figure 5 2 Power Supply Adjustments and Test Point Locations HP 85640A RF Tracking Generator Operation and Service Manual Adjustment Procedures 5 5 1 Power Supply Adjustments and Checks Equipment Digital voltmeter RR HH s HP 3456A Cables Test lead kit RI Re hs HP 34118A Procedure 1 Set the HP 85640A LINE switch to OFF Disconnect all cables from the tracking generator and remove the cover assembly refer to Removing and Replacing the Instrument Cover in Chapter 7 Place the tracking generator in the service position illustrated in Figure 5 1 Connect the negative test lead from the DVM to the negative end of A8C27 See Figure 5 2 Connect the positive DVM test lead to the positive end of A3C27 the end labeled 15V 9 Reconnect the tracking generator s power cord and set the LINE switch to ON 4 Set the DVM controls as follows FUNCTION eeeeeeR RII me DC VOLTS RANGE leeeeseee aerea m e eee 100 VOLTS 5 Locate L 15V ADJ see Figure 5 1 Adjust 15V ADJ for a DVM reading of 15 V 0 05 V Remove the positive test lead from the DVM from A3C27 Connect it to the negative end of A3C28 the end lab
11. Removing and Replacing the Instrument Cover Caution The tracking generator assemblies are sensitive to static Perform assembly procedures at static safe work stations See Figure 7 1 for an example of a static safe work station The cover assembly is removed and replaced the same way for each replacement procedure Follow these steps when performing any of the other replacement procedures Removal 1 Remove any adapters and cables from the front panel connectors 2 Place the tracking generator on its front panel 3 Use a 4 mm hex key to loosen the four screws in the rear bumper feet These feet are secured to the instrument cover assembly It is not necessary to remove them now 4 Pull the instrument cover toward the rear of the tracking generator to remove it Replacement 5 Turn the cover assembly so the vent holes are on the bottom of the tracking generator With the tracking generator sitting on its front panel slide the instrument cover assembly onto the tracking generator 6 Place the four screws in the rear bumper feet Use the 4 mm hex key to start tightening the screws 7 Alternately tighten the screws on each bumper foot to ensure that the cover is seated in the front frame 8 Torque each set screw to 40 or 50 inch pounds HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 7 Al Attenuator Replacement Caution The tracking generator assemblies are static sensiti
12. essseseseeee III 300 MHz SPAN 0 Hz RES BW oo eee meme e I II 300 Hz TRIG eleleeeeeeeeR aaa m n SINGLE If the host spectrum analyzer an HP 8561A HP 85624 or HP 8562B press REAR PNL OUTPUT 5 V GHz FAV If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press REAR PANEL 0 5 V GHz FAV Adjust TRACKING ADJUST to display a maximum signal level on the host spectrum analyzer screen Zero and calibrate the measuring receiver and power sensor Enter the power sensor s 300 MHz Cal Factor into the measuring receiver Disconnect the Type N cable from the tracking generator RF OUTPUT and connect the power sensor to the RF OUTPUT Set the OUTPUT LEVEL vernier to 10 dBm Adjust A3R3 LVL OFFSET for a 20 dBm 0 2 dB reading on the measuring receiver Set the OUTPUT LEVEL vernier to O dBm Adjust ASR4 LVL GAIN for a 10 dBm 0 2 dB reading on the measuring receiver Repeat steps 13 and 14 until the power level at each vernier setting is within tolerance Set the OUTPUT LEVEL vernier for a 10 dBm 0 05 dB reading on the measuring receiver Set the host spectrum analyzer CENTER FREQ to 2 9 GHz Enter the power sensor s 3 GHz Cal Factor into the measuring receiver Adjust A3R2 S T GAIN for a 10 dBm 0 2 dB reading on the measuring receiver Disconnect the DVM test leads from ASTP4 and A3C27 5 14 Adjustment Procedures HP 85640A RF Tracking Generator Operation and Service
13. 2000 MHz 27 dBe 1 55 1 80 dB 27 Non harmonic response amplitude 2000 MHz 23 dBe 3 45 4 01 dB 6 LO feedthrough amplitude 11 LO feedthrough 26 dBm 2 02 2 50 dB at 3 911 GHz 16 LO feedthrough 26 dBm 2 10 2 67 dB at 6 8107 GHz 7 Tracking generator feedthrough 13 TG feedthrough 95 dBm 1 74 1 98 dB 300 kHz to 1 MHz 14 TG feedthrough 115 dBm 1 74 1 98 dB 1 MHz to 2 GHz 15 TG feedthrough 110 dBm 1 74 1 98 dB 2 GHz to 2 9 GHz 8 Frequency tracking range 11 Negative frequency 5 kHz 1 Hz variation 12 Positive frequency 5 kHz 1 Hz variation HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 37 Adjustment Procedures What You ll Find in This Chapter This chapter contains adjustment procedure information for the HP 85640A RF tracking generator Use adjustment procedures after repairing the tracking generator or if performance test results fail specifications Safety Considerations Warning Adjustments in this section are performed with power supplied to the instrument and protective covers removed There are voltages at many points in the instrument that can if contacted cause personal injury Be extremely careful Adjustments should be performed only by trained service personnel Power is still applied to this instrument with the LINE switch in the OFF position Before removi
14. WARNING 0000000000000000 0000000000000000000 CO PATA ARA TAVA TATA TA DIOS OOS amp l wk27 Figure 2 4 Rear Panel Cable Connections Note On HP 8560 E Series spectrum analyzers BLANKING OUTPUT is labeled BLKG GATE OUTPUT Turning On the Tracking Generator If the tracking generator does not seem to function properly the first time you turn it on turn the power off and refer to the cable connection illustrations in Figure 2 3 and Figure 2 4 If the cable connections appear to be correct contact one of the HP sales and service offices listed in Table 2 3 2 8 Installation HP 85640A RF Tracking Generator Operation and Service Manual Sales and Service Offices Hewlett Packard has sales and service offices around the world providing complete support for Hewlett Packard products To obtain servicing information or to order replacement parts contact the nearest Hewlett Packard sales and service office listed in Table 2 3 In any correspondence be sure to include the pertinent information about model numbers serial numbers or assembly part numbers HP 85640A RF Tracking Generator Operation and Service Manual Installation 2 9 2 10 Table 2 3 Hewlett Packard Sales and Service Offices US FIELD OPERATIONS Customer Information Hewlett Packard Company 19320 Pruneridge Av
15. 1 5 dB 0 12 0 13 dB 9 Maximum step to step attenuator accuracy 10 dB 0 8dB 0 8 dB 0 40 dB 20 dB 0 8dB 0 8 dB 0 41 dB 30 dB 0 8 dB 0 8 dB 0 11 0 12 dB 40 dB 0 8dB 0 8 dB 0 13 0 14 dB 50 dB 06 8dB 0 8 dB 0 15 dB 60 dB 0 8 dB 0 8 dB 0 16 dB 70 dB 0 8 dB 0 8 dB 0 17 0 18 dB 2 Maximum leveled output power 13 Maximum leveled 0 dBm 0 46 dB output power 3 Level flatness 14 Maximum flatness 2 0 dB 0 41 dB 15 Minimum flatness 2 0 dB 0 41 dB 4 Harmonic spurious outputs 12 2nd harmonic level 300 kHz 25 dBe 1 55 1 80 dB 100 MHz 25 dBe 1 55 1 80 dB 300 MHz 25 dBe 1 55 1 80 dB 900 MHz 25 dBe 1 55 1 80 dB 1 4 GHz 25 dBc 3 45 4 01 dB 4 36 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual Table 4 9 Performance Test Record Page 3 of 3 8 Frequency Tracking Range Hewlett Packard Company Model HP 85640A Report No Serial No Date Test Test Description Results Measurement No Min Measured Max Uncertainty 4 13 8rd harmonic level 300 kHz 25 dBe 1 55 1 80 dB 100 MHz 25 dBe 1 55 1 80 dB 300 MHz 25 dBe 1 55 1 80 dB 900 MHz 25 dBe 1 55 1 80 dB 5 Non harmonic spurious outputs 26 Non harmonic response amplitude
16. 1 W1DS1 LED GRN BAR 0 56 MCD p o W1 85640 40004 6 2 Bumper 4 per 5041 8928 0 3 Screw 3 0 mmx6 mm panhead 0515 1146 0 4 Front dress panel 85640 00001 9 5 Front frame 5021 8693 4 6 WIDS2 LED RED 1 MCD p o W1 1990 0486 6 fi Lock washer 0 384 in ID 2190 0022 1 8 Hex nut 3 8x32 mm 2950 0001 8 9 Knob round 75 jade gray 0870 3215 0 10 Set screw 125 in 3030 0007 5 11 Bulkhead connector type N f 1250 2191 6 12 Hex nut 15 82x32 mm 0590 1251 6 13 W4 cable assembly 300 MHz IN 85640 60008 5 14 Not assigned 15 Hex nut 3 8x32 mm 2950 0001 8 16 Lock washer 314 in ID 2190 0083 4 17 Adapter SMA f to SMA f 1250 1666 8 8 PLACES 4 PLACES EN BENEATH 6 4 Assembly Replaceable Parts Figure 6 2 Mechanical Replaceable Parts 1 of 2 S O EACH KNOB BENEATH EACH KNOB wk 239 HP 85640A RF Tracking Generator Operation and Service Manual Part Numbers for Figure 6 3 Item Description HP Part CD Number 18 Screw 4 0x10 mm panhead 0515 1069 6 19 Screw 3 0x8 mm panhead 0515 1079 8 20 Screw 4 0x8 mm flathead 0515 1367 7 21 Screw 3 0x12 mm panhead 0515 1552 2 22 RFI gasket front 3 feet required 8160 0662 8 23 Screw 3 0x6 mm panhead 0515 1146 U 24 ATI 500 termination 1810 0118 1 25 Nut with lock washer 4 mm 0535 0082 3 26 Screw 4 40 312 in panhead 2200 0105 4 27 Set screw 125 in 4 4
17. A block diagram of the HP 85640A RF tracking generator is shown in Figure 7 9 Most of the RF circuitry is contained in the A2 tracking generator assembly The A3 interface assembly provides the control signals for the A2 tracking generator assembly A3 also monitors A2 s ALC loop ALC MON for unleveled conditions and multiplies the 300 MHz CAL OUTPUT signal from the host spectrum analyzer to 600 MHz for use by A2 The A1 Attenuator includes a dc blocking capacitor on its output to prevent damage due to reverse input voltages in less than 30 V de The 0 5V GHz INPUT is routed to the power level control circuitry refer to Figure 7 9 on the A3 interface assembly This signal is used for flatness compensation As the tuned frequency increases the 0 5V GHz INPUT voltage also increases causing A2 tracking generator s output power level to increase This helps compensate for increased power losses at higher frequencies The unlevel detector circuitry on A3 monitors the ALC MON line from the A2 tracking generator It lights the UNLEVELED LED on the instrument s front panel when an unleveled 7 18 Service Information HP 85640A RF Tracking Generator Operation and Service Manual condition is detected Under certain conditions it is normal for the output to be unleveled during retrace The BLANKING INPUT signal prevents the UNLEVELED LED from flashing during retrace when these conditions exist The tracking generator output may be leveled extern
18. Check that the fuse in A5FL1 and the voltage selector are correct for your power mains Refer to Chapter 2 Installation for additional power requirement information 7 16 Service Information HP 85640A RF Tracking Generator Operation and Service Manual 2 PLACES 8 4 PLACES 1 2 3 PLACES 5 4 2 PLACES wk 246 Figure 7 7 A5 FLL Line Filter Module Replacement HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 17 HP 85640A RF Tracking Generator Circuit Descriptions and Troubleshooting Procedures The HP 85640A RF tracking generator is designed for operation with HP 8560A E spectrum analyzers non Option 002 HP 8561A B E spectrum analyzers HP 8562A B spectrum analyzers m HP 8563A E spectrum analyzers These instruments referred to as host spectrum analyzers may have a much wider frequency range than the tracking generator s range of 300 kHz to 2 9 GHz The simplified block diagram of a spectrum analyzer tracking generator system Figure 7 8 shows only the host spectrum analyzer s low band 2 9 GHz The tracking generator accepts two RF signals from the host spectrum analyzer 18T LO OUTPUT and CAL OUTPUT and two control signals 0 5V GHz OUTPUT and BLANKING OUTPUT Although Figure 7 8 does not show these two control signals they appear as 0 5V GHz INPUT and BLANKING INPUT in Figure 7 9 Their oper
19. MHz FcentTER MHz 5 18 Adjustment Procedures HP 85640A RF Tracking Generator Operation and Service Manual Assembly Replaceable Parts What You ll Find in This Chapter The replaceable parts and assemblies of the HP 85640A tracking generator are listed in tables some with accompanying illustrations in this chapter Rebuilt exchange assembly part numbers are included here as well Refer to Chapter 7 for replacement procedures and the rebuilt exchange assembly procedure HP 85640A RF Tracking Generator Operation and Service Manual Assemhly Replaceable Parts 6 1 Major Assembly and Cable Locations Description HP Part CD Number Al attenuator 70 dB w blocking capacitor 5086 7845 2 A2 tracking generator 5086 7879 2 Rebuilt A2 exchange required 5086 6879 0 A3 interface assembly 85640 60001 5 A4 power supply assembly 85640 60006 U A4W1 cable assembly power supply primary 85640 60004 8 A4W2 cable assembly power supply to interface 85640 60008 fi Ab line filter switch assembly 5062 4853 6 A5W1 cable assembly ABFLI to A4W1 p o A5 N A A5W2 cable assembly line switch p o A5 N A A5W3 cable assembly grounding 5062 1908 1 ADW2SI switch DPST 3101 2905 7 AT1 500 terminator 1810 0118 1 W1 cable assembly front panel controls 85640 60002 6 W2 cable assembly tracking generator drive 8120 4157 U W3 cable assembly EXT ALC input 08560 60001 6 W4 cable assembly 300 MHz i
20. OUT ADAPTER BNC CABLE J wk224 Figure 4 5 Harmonic Spurious Outputs Test Setup 4 16 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 4 Harmonic Spurious Outputs Equipment Microwave spectrum analyzer seseeeee e eee e nes HP 8566A B Host spectrum analyzer HP 8560A E 8561A B E HP 8562A B or HP 8568A E Cables Type N 62em 24 in lseeseeeeeeeeee e hen HP 11500B C BNC 28 em 8 in lsssuleseelleeee ran HP 10502A BNC 62 cm 24 in 3 required 6 0 ete ent e nen 8120 1839 SMA 52 cm 20 in 2 nre 5061 9038 Adapter Type N m to BNC TP 1250 1476 Procedure 1 Connect the equipment as shown in Figure 4 5 Use the type N cable to connect the tracking generator RF OUTPUT to the host spectrum analyzer s INPUT 509 Press PRESET on the host spectrum analyzer and set the controls as follows CENTER FREQ R 300 MHz SPAN essseeesseeees eee me ee e e e e 0 Hz If the host spectrum analyzer is an HP 8561A HP 8562A or HP 8562B press SWEEP REAR PNL OUTPUT 5 V GHz FAV If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press AUX CTRL REAR PANEL 5 V GHz FAV On the tracking generator set the OUTPUT LEVEL vernier knob to 5 dBm Set the OUTPUT LEVEL attenuator knob to 0 dB then adjust TRACKING ADJUST to display a maximum signal level on the host spectrum analyzer Set the tracking generator OUTPUT LEV
21. but are similar to results you may expect with an HP 8561A or HP 8562A Set up the System To measure the rejection of a bandpass filter 1 Make the necessary connections between the spectrum analyzer and the tracking generator see Figure 3 3 2 Examine the tracking generator s output power by connecting its RF OUTPUT directly to the spectrum analyzer s INPUT 509 On the spectrum analyzer press PRESET FREQUENCY START FREQ 300 kHz STOP FREQ 2 9 GHz 3 Select the 0 5 V GHz OUTPUT on the spectrum analyzer by pressing SWEEP REAR PNL OUTPUT 5V GHZ FAV E On an HP 8560E HP 8561E or HP 8563E press SWEEP GATE OFF 4 Adjust the tracking generator s output power with the OUTPUT LEVEL controls set the output power of the tracking generator to 10 dBm by setting the attenuator right hand knob to 10 dBm and the vernier left hand knob to O dB The filter we are testing will not be damaged by the 10 dBm power level Figure 3 21 shows the spectrum analyzer display with these settings Note Although the displayed start frequency annotation was set to 300 kHz notice that it remains at 0 Hz This is due to the resolution of the display If the stop frequency is decreased to 1 GHz the start frequency reads 300 kHz ATTEN 10dg RL Ocd amp em 10087 CENTER 42 450GHz SPAN 2 9006Hz RBW 2 0MHz VBW 3 0MHz SWP 60ms Figure 3 2
22. or HP 8562B press SWEEP REAR PNL OUTPUT 5 V GHz FAV If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press AUX CTRL REAR PANEL 5 V GHz FAV 4 On the tracking generator set the OUTPUT LEVEL vernier knob to 5 dBm Set the OUTPUT LEVEL attenuator knob to 0 dB then adjust TRACKING ADJUST to display a maximum signal amplitude on the host spectrum analyzer 5 Zero and calibrate the measuring receiver power sensor combination in log mode power level readings are in dBm Enter the power sensor s 300 MHz calibration factor into the measuring receiver 6 Replace the type N cable on the RF OUTPUT with the power sensor 7 On the tracking generator set the OUTPUT LEVEL vernier knob to O dBm and the OUTPUT LEVEL attenuator knob to 10 dB 8 On the host spectrum analyzer press TRIG SINGLE 9 Press RATIO on the measuring receiver The measuring receiver readings are now relative to the power level at 300 MHz 10 Set the spectrum analyzer center frequency to 300 kHz Press TRIG SINGLE 11 Enter the appropriate power sensor calibration factor into the measuring receiver as indicated in Table 4 4 12 Record the measuring receiver power level reading as the flatness in Table 4 4 HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 13 3 Level Flatness 13 Repeat steps 10 through 12 to measure the flatness at each CENTER FREQ setting listed in Table 4 4 The fr ke
23. 1 4 1 Maximum insertion loss 1 5 dB Connectors SMA m both ends Length gt 52 em 20 in Non metallic N A HP 8710 0033 A alignment tool Balldriver 0 050 in HP 8710 1199 A Hexdriver 0 050 in HP 8710 1250 T P Performance tests A Adjustments T Troubleshooting HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 5 1 Output Attenuator Accuracy Specification lt 0 8 dB 10 dB step lt 1 5 dB maximum for attenuator settings 10 to 70 dB referenced to 0 dB setting Related Adjustment There is no related adjustment for this performance test Description The tracking generator s RF OUTPUT is connected to the host spectrum analyzer s INPUT 500 Tracking is adjusted at 300 MHz for a maximum signal level The tracking generator s RF OUTPUT is then connected to the input of a measuring receiver The measuring receiver used in its tuned RF level TRFL mode measures the tracking generator s output attenuator accuracy relative to the O dB attenuator setting The step to step error is calculated BNC CABLE HOST ENC CABLE SPECTRUM ANALYZER HP 85640A Lo swp TRACKING GENERATOR sae 0 5V GHz 0 5V GHz BLANK I NG INPUT INPUT RF E essen L O ooooo wege 000 jeu E MHz DDD O d GOW OT 60 gg 222 a INPUT I 1ST LO INPUT 500 SMA CABLE OUTPUT CAL BNC CABLE OUTPUT TYPE N CABLE MEASURING RECEIV
24. 2 2 2 ee 7 23 Troubleshooting Tracking Generator Related Faults 0 22 7 24 Output Unleveled 2 a 1 24 Excessive Residual FM lll a 1 26 Flatness Out of Tolerance 4 2l ll ll ls 7 27 Harmonic Spurious Outputs Too High ccn 7 28 No Output Power 2 555A 7 30 Index HP 85640A RF Tracking Generator Operation and Service Manual Contents 3 Figures 1 1 HP 85640A with Accessories Supplied l l 1 3 1 2 An Example of a Serial Number Label lll len 1 4 2 1 Voltage Selection Switch and Line Fuse Locations ls 2 4 2 2 AC Power Cables Available l l ll lll 2 6 2 8 Front Panel Cable Connections ee ee a 2 7 2 4 Rear Panel Cable Connections l l ll l l 2 8 3 1 Front Panel Feature Overview 2 4 l l eA 3 3 3 2 HP 85640A Rear Panel Feature Overview 2 2 2 2 3 4 3 3 Tracking Generator to Host Analyzer Front Panel Connections 3 5 3 4 Tracking Generator to Host Analyzer Rear Panel Connections 3 6 3 5 Host Spectrum Analyzer and Tracking Generator System Block Diagram 3 7 3 6 Tracking Generator Power over Specified Frequency Range 3 10 3 7 Display of DUT Response 4 2 s s ll ln 3 10 3 8 System Setup for Transmission Measurement 9 11 3 9 Faster Sweep Times in Stimulus Response Auto Coupled Mode
25. 3 28 3 31 Measuring Rejection Range with Delta Markers 3 28 3 32 Increased Dynamic Measurement Range 2 ee ee 3 29 3 33 System Setup for a Reflection Measurement 2 2 04 82 3 31 3 34 Display with System Configured for a Reflection Measurement 3 31 3 35 Spectrum Analyzer Display of Bandpass Filter Region 2 2 3 32 3 36 On Screen Prompts to Connect an Open aoao e a a e 3 33 3 37 Connect the Open 2 l l ls 3 33 3 38 On Screen Prompts to Connect an Short ee ee llle 3 34 3 39 Connect the Short 2 2 2 ll l l 44 4 4 3 34 Contents 4 HP 85640A RF Tracking Generator Operation and Service Manual 3 40 Normalized Return Loss Measurement a a a a 3 35 3 41 Return Loss Reading Using the MKR Function Lc cles 3 36 3 42 Display with the System Configured for a Reflection Measurement 3 38 3 43 System Setup for a Reflection Measurement c 3 38 3 44 Spectrum Analyzer Display of Bandpass Filter Region 2 2 2 3 39 3 45 Return Loss Reading Using the MKR Function 2 less 3 40 4 1 HP 85640A RF Tracking Generator Connections 02 422 4 3 4 2 Output Attenuator Accuracy Test Setup en 4 6 4 3 Maximum Leveled Output Power Test Setup lll rs 4 9 4 4 Level Flatness Test Setup lll e les 4 12 4 5 Harmonic Spurious Outputs Test Setup ee llle n 4 16 4 6 Non Har
26. 3 33 The corresponding display is illustrated in Figure 3 34 3 30 Operation HP 85640A RF Tracking Generator Operation and Service Manual ayes PACKED pa einer STATE Es E 0111 m VOLUME oum Le 5 L Q o KING ADJUST DIRECTIONAL DEVICE 500 BRIDGE UNDER TERMINAT ION TEST wk254 Figure 3 33 System Setup for a Reflection Measurement ATTEN 10dB MKA 19 50dBm RL OOE TOOR T LEO Vu START OHZ STOP 2 900GHz ABW 1 0MHz VBW 1 0MHz SWP DO Figure 3 34 Display with System Configured for a Reflection Measurement HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 31 6 Adjust the tracking generator s output power with the OUTPUT LEVEL controls increase the output power 6 dB by setting the attenuator right hand knob to 0 dBm and the vernier left hand knob to 4 dBm This output power level differs from the level used for the transmission measurement example because a 6 dB coupler is used in the reflection measurement setup 7 Select stimulus response aut
27. 4 0955 0312 MAT 5 5 0955 0313 MAT 6 6 0955 0314 MAT 7 7 These manufacturer s part numbers are for Mini Circuits Lab Inc parts Part numbers for other manufacturers parts may be different 5 10 Adjustment Procedures HP 85640A RF Tracking Generator Operation and Service Manual Table 5 6 Harmonic and Subharmonic Levels 2 600 MHz Level Adjustment Frequency Marker Amplitude Specification MHz dBc dBc 300 25 900 25 1200 10 1500 25 1800 10 2100 25 2400 10 HP 85640A RF Tracking Generator Operation and Service Manual Adjustment Procedures 5 11 3 Power Level Adjustments Assembly Adjusted A3 interface assembly Related Performance Test Level flatness Description The OUTPUT LEVEL vernier is set to 4 dBm and the voltage at the vernier control s wiper is checked for 2 5 V the electrical center of the control If necessary the vernier control knob is reset The gain and offset of the power level control circuitry is adjusted to yield 10 dBm at the 0 dBm vernier setting and 20 dBm at the 10 dBm vernier setting the OUTPUT LEVEL attenuator is set to 10 dB The sweep plus tune gain S T GAIN is adjusted for the same amplitude at 2 9 GHz as at 300 MHz Caution The tracking generator assemblies are static sensitive Perform this adj
28. 856404 1 10 General Information HP 85640A RF Tracking Generator Operation and Service Manual Table 1 2 HP 85640A Characteristics Note These are not specifications Characteristics provide useful but nonwarranted information about instrument performance Frequency Characteristics Frequency Drift after 30 min warmup Tracking Drift 300 Hz per hour Usable in a 1 kHz RES BW after 5 min Usable in a 300 Hz RES BW after 30 min Amplitude Characteristics Output Range Output Attenuator Repeatability Effective Source Match O dB attenuator setting 10 dB attenuator setting Dynamic Range 300 Hz RES BW O dB input attenuation 300 kHz to 1 MHz 1 MHz to 2 0 GHz 2 0 GHz to 2 9 GHz 2 8 dBm to 80 dBm lt 0 2 dB lt 1 92 1 1 33 1 gt 95 dB gt 115 dB gt 110 dB HP 85640A RF Tracking Generator Operation and Service Manual General Information 1 11 Inputs and Outputs 300 MHz INPUT Connector Impedance Input amplitude BNC female front panel 500 10 dBm 1 0 dB LO INPUT Connector Impedance Frequency Input amplitude SMA female front panel 500 3 9107 GHz to 6 8107 GHz 16 5 dBm 42 0 dB 0 5V GHz INPUT Connector Impedance Input amplitude BNC female rear panel 2100 kQ 0 5 V GHz of tuned frequency BLANKING INPUT Connector Input amplitude During sweep During retrace B
29. DOOR OPENS UPWARD gt gt o 000000000000000000000000 0000000000000000000 000000000000000000000000 e EXT ALC UT e CAUTION BLANKING 0 5V GHz INPUT INPUT FUSE IN USE NL TIOTI ATO O IVA OCS OVA OGL IVA 001 WARNING THE PROTEC ON THIS EQUIPTMENT PROVIDE PROTECTION NO USER SERVICABLE SERVICING TO QUALIF C FUSE 230V F 0 5A CAUTION FOR CONTI AGAINST FIRE HAZARD WITH SAME TYPE AND ALC INT J NOTE WHEN VOLTAGE SWITCH SPARE FUSE VOLTAGES READ UPSIDE DOWN IN OPERATION POSITION wk24 Figure 2 1 Voltage Selection Switch and Line Fuse Locations 2 4 Installation HP 85640A RF Tracking Generator Operation and Service Manual Checking the Fuse The type of ac line input fuse depends on the input line voltage Use the correct fuse for your voltage 100 V to 120 V operation 1 A 250 V UL CSA HP part number 2110 0823 for use in any of the United States 220 V to 240 V operation 0 5 A 250 V IEC HP part number 2110 0458 for use in other countries The line fuse is housed in a small container located inside the rear panel power connector module When replacing a fuse be sure the arrows on the container match the direction of the arrows on the power conne
30. Figure 3 22 Figure 3 33 and Figure 3 43 you also will need a directional bridge with sufficient range to accommodate the frequency of the DUT a 500 termination a short and an open a barrel or bullet connector to replace the DUT when making the reference trace and appropriate cables and adapters Note m If you have an HP 8560A E HP 8561B E or HP 8563A E spectrum analyzer follow the instructions starting on page 3 9 for a transmission measurement and on page 3 30 for a reflection measurement These spectrum analyzers have tracking generator related softkeys included in their firmware m If you have an HP 8561A or HP 8562A B spectrum analyzer follow the instructions starting on page 3 21 for a transmission measurement and on page 3 37 for a reflection measurement 3 8 Operation HP 85640A RF Tracking Generator Operation and Service Manual Transmission Measurements Making a Transmission Measurement Using an HP 8560A E HP 8561B E or HP 8563A E Spectrum Analyzer Note Instructions for making transmission measurements using an HP 8561A or HP 8562A B begin on page 3 21 The examples in this section were made using an HP 8560A spectrum analyzer but are similar to results you may expect with an HP 8560E HP 8561B E or HP 8563A E Set up the System To measure the rejection of a bandpass filter 1 Make the necessary connections between the spectrum analyzer and the tracking generator see Figure 3 3 Ex
31. IST LO OUTPUT amplitude performance test for the host spectrum analyzer If the spectrum analyzer passes this test the fault most likely is with the A2 tracking generator If the spectrum analyzer fails this test determine the equivalent CENTER FREQ setting at which the power level was out of tolerance by subtracting 3 9107 from the Ist LO frequency Compare the result with the frequency ies at which the flatness was out of tolerance Repeat the test with the power sensor connected to A2J3 remove AT1 noting the equivalent center frequency of any out of tolerance power levels The power level should be 14 5 dBm 3 dB If the power level is acceptable at the spectrum analyzer s IST LO OUTPUT but out of tolerance at A2J3 and the CENTER FREQ setting of the out of tolerance power levels is close to the frequencies that caused the unleveled condition suspect A2 If the power level at the IST LO OUTPUT is also out of tolerance suspect the host spectrum analyzer 3 Check all coax cables especially semirigid cables A fault in one of these cables can cause a very high Q power hole HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 27 Harmonic Spurious Outputs Too High Harmonic and spurious outputs may be generated by A2 itself or may be present in either the 300 MHz INPUT or LO INPUT signals There is a direct relationship between spurious signals on the 1st LO and spurious signa
32. Manual 4 Tracking Oscillator Range Adjustments 4 Tracking Oscillator Range Adjustments Assemblies Adjusted A2 tracking generator assembly A3 interface assembly Related Performance Test Tracking adjustment range Description The centering of the tracking oscillator range is adjusted in the factory to ensure that the tracking adjustment works properly Over a period of 5 years however the center frequency of the tracking oscillator range may drift outside of acceptable limits These limits are tested with the tracking adjustment range performance test in Chapter 4 of this manual Perform this adjustment only if the tracking adjustment range performance test has failed This adjustment centers the tracking oscillator range Typically performing the fine adjustment on the A3 interface assembly is sufficient In some cases however adjusting the A2 tracking generator coarse adjustment is necessary The coarse adjustment A2C3 is rated for a maximum of 10 adjustment cycles Because of this limitation adjust AZC3 only when absolutely necessary Caution The tracking generator assemblies are static sensitive Perform this adjustment procedure at a static safe workstation Refer to Figure 7 1 for an example of a static safe workstation BNC CABLE HOST BNC CABLE SPECTRUM HP B5640A ANALYZER TRACKING GENERATOR
33. OFF If the marker frequency is less than 2 5 GHz press PEAK SEARCH MKR CF STEP MARKER DELTA If the marker frequency i is greater than 2 5 GHz press PEAK SEARCH PRESEL PEAK Wait for the i i message to disappear Then press M KR CF STEP MARKER DELTA Press CENTER FREQUENCY fr to tune to the second harmonic Press PEAK SEARCH If the center frequency value is greater than 2 5 GHz press PRESEL PEAK and wait for the i message to disappear Record the marker amplitude reading in Table 4 5 as the 2nd harmonic level for the 300 kHz tracking generator output frequency If the tracking generator output frequency is less than 1 GHz press CENTER FREQUENCY UTU on the HP 8566A B to tune to the third harmonic Press P PEAK SEARCH If the center frequency is greater than 2 5 GHz press PRESEL PEAK and wait for the message to disappear Record the marker amplitude reading in Table 4 5 as the 3rd harmonic level for the 300 KHz tracking generator output frequency On the HP 8566A B press MARKER OFF 11 Repeat steps 9 and 10 for the remaining tracking generator output frequencies listed in Table 4 5 Note that the host spectrum analyzer s center frequency is the same as the tracking generator output frequency 12 Locate the most positive 2nd harmonic level in Table 4 5 and record the value below 2nd harmonic level dBe 13 Locate the most positive 3rd harmonic level
34. Post Repair or Specification Failure Adjustment List 5 8 5 3 Adjustable Components 2 2 2 2 2 25252 2 25 25 5 5 8 5 4 Factory Selectable Component aooaa a a 5 8 5 5 Attenuation Values of Pad ASUS 2 lll lll n 5 10 5 6 Harmonic and Subharmonie Levels 2 2 2 2 2 2 2 2 5 11 5 7 Tracking Oscillator Range Centering 2 a a 5 18 6 1 Part Numbers for Figure 6 2 ll lle 6 4 7 1 Static Safe Accessories 2 2 2 ll ll 4 4 4 s 7 3 Contents 6 HP 85640A RF Tracking Generator Operation and Service Manual General Information What You ll Find in This Operation and Service Manual Chapter 1 General Information gives specifications and characteristics for the instrument Chapter 2 Installation discusses power requirements spectrum analyzer compatibility and interconnect requirements and gives a list of HP sales and service offices Chapter 3 Operation explains the use of front and rear panel features and gives the steps for transmission and reflection measurements using the tracking generator with a host spectrum analyzer Chapter 4 Performance Tests describes the tests you ll use to verify the electrical performance of the tracking generator Chapter 5 Adjustment Procedures provides steps to adjust assemblies of the tracking generator Chapter 6 Assembly Replaceable Parts shows the replaceable parts of the tr
35. See Figure 5 4 The bottom shield should remain in position See Figure 5 3 Locate A3U4 and note the HP part number 0955 0311 for example or the manufacturer s part number MAT 4 for example Refer to Table 5 5 to determine the current attenuation value of ASU4 Record the value below Current attenuation value dB HP 85640A RF Tracking Generator Operation and Service Manual Adjustment Procedures 5 9 2 600 MHz Level Adjustment 13 Calculate the desired attenuation value by adding the current attenuation value to the attenuation difference desired attenuation current attenuation value attenuation difference Desired attenuation dB 14 Select a new value for pad A3U4 using Table 5 5 based on the desired attenuation calculated above 15 Replace the A3 interface assembly top shield Set the LINE switch to ON 16 On the host spectrum analyzer press PEAK SEARCH MARKER DELTA FREQUENCY CENTER FREQ Usethe step keys to set the spectrum analyzer to each of the center frequencies listed in Table 5 6 At each frequency setting press PEAK SEARCH and record the marker amplitude in Table 5 6 for the appropriate frequency The marker amplitude should be less than the specification listed 17 Replace the BNC cable at A3J5 with the W5 cable Table 5 5 Attenuation Values of Pad A3U4 Attenuation HP Part Number Manufacturer s Part Number dB 0955 0308 MAT 1 1 0955 0309 MAT 2 2 0955 0310 MAT 3 3 0955 0311 MAT 4
36. V m from 14 kHz to 1 GHz with 20 dB relaxation IF frequencies 30 dB relaxation at spectrum analyzer IF frequencies for Option 001 spectrum analyzers Full limits Exceptioned 1 8 General Information HP 85640A RF Tracking Generator Operation and Service Manual General Specifications Type tested to MIL T 28800C Class 5 environmental conditions as listed below Warmup Temperature Operating Non operating Humidity Altitude Operating Non operating Vibration b to 15 Hz 15 to 25 Hz 25 to 55 Hz Pulse Shock Half Sine Transit Drop 5 min from ambient conditions 10 C to 4 62 C to 4 95 at 40 C for 5 days 15 000 ft 50 000 ft 0 060 in peak to peak excursion 0 040 in peak to peak excursion 0 020 in peak to peak excursion 30 g for 11 ms duration 8 in drop on 6 faces and 8 corners HP 85640A RF Tracking Generator Operation and Service Manual General Information 1 9 Physical and Mechanical Specifications Power Requirements Voltage 100 120 220 or 240 V ac 10 Current 47 to 66 Hz Maximum power dissipation 130 VA 35 W Compatibility Works with HP 8560A E HP 8561A B E HP 8562A B and HP 8563A E portable spectrum analyzers Weight 8 4 kg 18 5 Ib Dimensions 337 6 mm 13 5 in wide 461 1 mm 18 3 in long O 138 6 mm 5 5 in deep Except HP 8560A E Option 002 This option does not provide sufficient 1st LO drive to the HP
37. also set the rear panel sweep output to 0 5 V GHz as instructed in each performance test Retain the cable configuration illustrated in Figure 4 1 unless a test procedure specifies otherwise BNC CABLE HOST BNC CABLE SPECTRUM HP 85640A ANALYZER TRACKING GENERATOR LO SWP BLANK ING 0 5V GHz 0 5V GHz BLANK ING INPUT INPUT conan C3 aonaon c3 ooooo0 300 MHz O ooooo 5 o 000 sss 8 ooo O oo ooo a 1ST LO CAL OUTPUT OUTPUT SMA CABLE BNC CABLE wk 220 Figure 4 1 HP 85640A RF Tracking Generator Connections Test Equipment You ll Need Refer to Table 4 2 for the recommended test equipment model numbers Any equipment that meets the critical specifications given in the table may be substituted for the recommended model s The table also lists the recommended test equipment for the tracking generator s adjustment procedures located in Chapter 5 Adjustment Procedures and the troubleshooting procedures in Chapter 7 Service Information Note Each host spectrum analyzer has a required warm up time refer to Table 1 1 in the appropriate installation and verification manual for specifications Each performance test in this section describes setting your host spectrum analyzer for 0 5 V GHz output Recording Test Results Record test results in the performance test record located at the end of this chapter The table lists test specificatio
38. calibration HP 8561A or HP 8562A B 3 15 3 26 HP 8560A E HP 8561B E HP 8563A E 3 9 HP 8561A HP 8562A B 3 21 savelock on error 3 17 3 27 storing thru reference 3 17 3 27 troubleshooting 7 24 30 block diagram 7 18 excessive FM 7 26 harmonic outputs too high 7 28 no output power 7 30 output unleveled 7 24 spurious outputs too high 7 28 U unleveled LED 3 2 Index 3
39. error correction routine e Press sHiFT START FREQ to use the error correction factors just calculated 8 Connect the type N cable from the tracking generator output to the HP 8566A B RF INPUT HP 85640A RF Tracking Generator Operation and Service Manual See Figure 4 6 Performance Tests 4 21 5 Non Harmonic Spurious Outputs Measure fundamental amplitudes 9 10 11 12 13 14 Set the host spectrum analyzer s center frequency to the fundamental frequency listed in Table 4 6 Set the HP 8566A B controls as follows SI wa OA 100 kHz REFERENCE LEVEL 5 dBm ATTEN 2 0 IH e mm eet et III 10 dB Set the HP 8566A B center frequency to the fundamental frequency listed in Table 4 6 On the HP 8566A B press PEAK SEARCH If the marker frequency is greater than 2 5 GHz press PRESEL PEAK and wait for the F i message to disappear Press MKR REF LVL Wait for another sweep to finish Record the HP 8566A B marker amplitude reading in Table 4 6 as the fundamental amplitude Repeat steps 9 through 13 for all fundamental frequency settings in Table 4 6 Measure non harmonic responses 15 16 1T 18 19 On the host spectrum analyzer set the center frequency to 300 kHz Set the HP 8566A B START FREQ STOP FREQ and RES Bw as indicated in the first row of Table 4 7 Press SINGLE on the HP 8566A B and wait for the sweep to finish Press PEAK SEARCH If the marker fre
40. filter See Figure 3 18 ATTEN 10dB 2MKR S83 0dB RL OdB8 TOOR 539 5MHz ZNM E EA 539 5 MHz 83 3 dB M Loll E START 1 OMHZ STOP 1 0000GFHz SABW 300Hz vBW 300Hz SWP 1 79eec Figure 3 18 Measuring Rejection Range with Delta Markers 18 Press AMPLITUDE note that activating normalization changes the REF LVL softkey label to NORM REF LVL NORM REF LVL like NORM REF POSN is a trace math function that allows you to change the position of the normalized trace within the range of the 3 18 Operation HP 85640A RF Tracking Generator Operation and Service Manual graticule without changing spectrum analyzer settings See Figure 3 19 As a result your measurement remains calibrated However using these two trace math functions may mean that the top of the screen does not represent the gain compression limit 19 RANGE LVL increases the dynamic range of the measurement by changing the input attenuator and IF gain It is equivalent to REF LVL used in signal analysis measurements Both RANGE LVL and REF LVL ensure the input signal is not in gain compression To increase dynamic range of the measurement press RANGE LVL Note that while increasing the dynamic range more errors are introduced into the measurement such as attenuator switching However as shown in Figure 3 20 dynamic range level has increased when using RANGE LVL ATTEN 10dB 2MKR amp 8G3 g3
41. fine adjustment of the tracking generator output frequency to compensate for the frequency inaccuracies of the host spectrum analyzer s 10 7 MHz IF The tracking oscillator determines the residual FM and frequency drift of the tracking generator The 182 14 MHz output frequency is obtained by doubling the output of a crystal oscillator operating at 91 07 MHz Upconverter The upconverter mixes the tracking oscillator output with the 600 MHz signal coming from the A3 Interface Assembly The upconverter also contains a filter which passes only the 782 14 MHz upper sideband Pentupler The pentupler multiplies the 782 14 MHz signal by five to generate 3 9107 GHz which equals the host spectrum analyzer s 1st IF A dual cavity band pass filter centered at 3 9107 GHz eliminates all unwanted harmonics of 782 14 MHz Modulator The output of the pentupler passes through a modulator which adjusts the power level going into the output mixer The modulator is controlled by an ALC circuit on the bias board controlled by a detector in the output amplifier If the detected output power is too high the ALC drives the modulator to decrease the input level into the output mixer which decreases the output power Coupler The 1st LO INPUT signal from the host spectrum analyzer is coupled and buffered to drive the output mixer The main line of the coupler is terminated in 500 by AT1 The loss through the coupler main line is less than 2 5 dB Output mixer The 3
42. meaning before operating this instrument Caution The caution sign denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in damage to or destruction of the instrument Do not proceed beyond a caution sign until the indicated conditions are fully understood and met Warning The warning sign denotes a hazard It calls attention to a procedure which if not correctly performed or adhered to could result in injury or loss of life Do not proceed beyond a warning sign until the indicated conditions are fully understood and met General Safety Considerations Warning Before this instrument is switched on make sure it has been properly grounded through the protective conductor of the ac power cable to a socket outlet provided with protective earth contact Any interruption of the protective grounding conductor inside or outside the instrument or disconnection of the protective earth terminal can result in personal injury Warning There are many points in the instrument which can if contacted cause personal injury Be extremely careful Any adjustments or service procedures that require operation of the instrument with protective covers removed should be performed only by trained service personnel Caution Before this instrument is switched on make sure its primary power circuitry has been adapted to the voltage of the ac power source
43. on the host spectrum analyzer 5 Set the frequency counter controls as follow SAMPLE RATE eseeee RR HH rea midrange 10Hz 500MHz 500MHz 26 5GHz Switch sese 500MHz 26 5GHz RESOLUTION eeeeeeee RR RR Re e e res 1 Hz 6 Wait for the counter to gate two or three times and record the counter reading below as the peaked frequency Peaked frequency MHz 7 On the tracking generator set the TRACKING ADJUST control fully clockwise Notice that this is a multi turn control HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 33 8 Frequency Tracking Range 8 Wait for the counter to gate two or three times then record the counter reading below as the maximum frequency Maximum frequency MHz 9 On the tracking generator set the TRACKING ADJUST control fully counterclockwise 10 Wait for the counter to gate two or three times then record the counter reading below as the minimum frequency Minimum frequency MHz 11 Subtract the minimum frequency from the peaked frequency and record the result as the negative frequency variation The variation should be greater than 5 kHz Perform the tracking oscillator range adjustment if the variation is less than 5 kHz Negative frequency variation kHz 12 Subtract the maximum frequency from the peaked frequency and record the result as the positive frequency variation The variation should be greater than 5 kHz Perform the
44. spectrum analyzer sweeps If the UNLEVELED indicator does not light during a sweep proceed to step 13 4 10 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 2 Maximum Leveled Output Power 12 Repeat steps 9 through 11 until an OUTPUT LEVEL vernier setting is achieved that results in a leveled output during the entire sweep 13 Record the power level value indicated by the OUTPUT LEVEL vernier as the maximum leveled output power Maximum leveled output power dBm HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 11 3 Level Flatness Specification Flatness lt 2 0 dB referenced to 300 MHz 10 dB attenuation O dB vernier setting Related Adjustment Power level adjustment Description The tracking generator s RF OUTPUT is connected to the host spectrum analyzer s INPUT 500 Tracking is adjusted at 300 MHz for a maximum signal level The tracking generator s RF OUTPUT is then connected to a calibrated power sensor and the power level is measured at 300 MHz The measuring receiver is set to RATIO mode so that subsequent power level readings are dB relative to the power level at 300 MHz The tracking generator is stepped through several frequencies within its range The output power difference relative to the power level at 300 MHz is measured at each frequency and recorded BNC CABLE HOST com
45. to perform each test Refer to each test for appropriate adapters and cables HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 1 Table 4 1 Performance Tests Test Test Name Equipment Used Number 1 Output attenuator accuracy Measuring receiver Host spectrum analyzer 2 Maximum leveled output power 500 termination Host spectrum analyzer 3 Level flatness Measuring receiver Power sensor Host spectrum analyzer 4 Harmonic spurious outputs Microwave spectrum analyzer Host spectrum analyzer 5 Non harmonic spurious outputs Microwave spectrum analyzer Host spectrum analyzer 6 LO feedthrough amplitude Microwave spectrum analyzer Host spectrum analyzer fi Tracking generator feedthrough 500 termination Host spectrum analyzer 8 Frequency tracking range Frequency counter Power splitter Host spectrum analyzer A host spectrum analyzer can be any one of these models HP 8560A or HP 8560E spectrum analyzer non Option 002 HP 8561A HP 8561B or HP 8561E spectrum analyzer HP 8562A or HP 8562B spectrum analyzer HP 8563A or HP 8563E spectrum analyzer 4 2 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual Before Beginning The HP 85640A RF tracking generator requires at least a five minute warm up before beginning the performance tests Figure 4 1 illustrates the connections to make between the host spectrum analyzer and the tracking generator You must
46. tracking generator have the complete serial number available to ensure obtaining the most complete and accurate information possible The serial number label is attached to the rear of the tracking generator The serial number has two parts a prefix the first four numbers and a letter and a suffix the last five numbers See Figure 1 2 The first four numbers of the prefix are a code identifying the date of the last major design change incorporated in your analyzer The letter identifies the country in which the unit was manufactured The five digit suffix is a sequential number and is different for each unit Whenever you list the serial number or refer to it in obtaining information about your tracking generator be sure to use the complete number including the full prefix and the suffix HEWLETT Cy PACKARD 2 50A0082 7 MADE IN USA V 2 A Y y PREF X SUFF IX A Figure 1 2 An Example of a Serial Number Label Calibration Cycle The performance tests located in Chapter 4 Performance Tests should be used every 12 months to check the analyzer against the specifications listed in Table 1 1 1 4 General Information HP 85640A RF Tracking Generator Operation and Service Manual Specifications and Characteristics Table 1 1 lists the tracking generator s specifications Unless stated otherwise all specifications describe the tracking generator s warranted performance under these conditions a five minut
47. tracking oscillator range adjustment if the variation is less than 5 kHz Positive frequency variation kHz 4 34 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 8 Frequency Tracking Range Table 4 9 Performance Test Record Page 1 of 3 Hewlett Packard Company Address Report No Date e g 10 FEB 1992 Model HP 85640A Serial No Options Customer Tested by Ambient temperature C Relative humidity Power main line frequency Hz nominal Test Equipment Used Description Model No Trace No Cal Due Date Host spectrum analyzer Measuring receiver Power sensor Microwave spectrum analyzer Frequency counter Power splitter Special notes HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 35 8 Frequency Tracking Range Table 4 9 Performance Test Record Page 2 of 3 Hewlett Packard Company Model HP 85640A Report No Serial No Date Test Test Description E Results Measurement No Min Measured Max Uncertainty 1 Output attenuator accuracy 8 Maximum cumulative attenuator accuracy 10 dB 15dB LL dB 0 40 dB 20 dB 15dB 1 5 daB 0 07 0 08 dB 30 dB 1 5 dB 1 5 dB 0 09 dB 40 dB 15dB 1 5dqB 0 10 dB 50 dB 1 5 dB 1 5 dB 0 11 dB 60 dB 1 5 dB 1 5 dB 0 12 dB 70 dB 1 5 dB
48. 0 1 MO Switch ceia 509 10Hz 500MHz 500MHz 26 5 GHz Switch ea 10Hz 500MHz Offset the counter s displayed frequency by 300 MHz by pressing SET OFS MHz 300 CHS ENTER Note Pressing OFS MHz toggles between offset and normal modes 10 11 12 13 14 15 Rotate the TRACKING ADJUST control fully counterclockwise Note the frequency counter reading Rotate the TRACKING ADJUST control fully clockwise Access A3R1 COR TRACK through the right hand side of the chassis see Figure 5 8 Adjust ASR1 COR TRACK for a counter reading equal to the absolute value of the frequency noted in step six above 100 Hz Repeat steps six through eight at least once more until the absolute values of the counter readings with the TRACKING ADJUST control fully clockwise and fully counterclockwise are within 500 Hz of each other If the absolute values of the counter readings cannot be set to within 500 Hz of each other continue with step 11 to check the absolute tracking range It is acceptable for the absolute values of the counter readings to not be within 500 Hz of each other as long as the tracking generator has sufficient absolute tracking range Press OFS MHz on the counter The counter should display a frequency of approximately 300 MHz Rotate the TRACKING ADJUST fully counterclockwise The frequency counter should read less than 299 993 MHz If the frequency counter reads greater than 299 993 MHz pe
49. 0 3030 0007 5 28 Attenuator knob shaft adapter 5021 8695 6 29 Attenuator bracket 5002 0608 U 30 Shield screws 2 center 2 5x16 mm panhead 0515 0951 3 Shield screws 4 outer 2 5x14 mm panhead 1390 0745 8 31 Lock washer 2 5 mm ID 2190 0583 9 32 O ring 0 070 in ID 0905 0375 2 39 Screw 3 0x8 mm flathead 0515 1459 8 94 Screw 3 0x6 mm panhead 0515 1146 0 35 Hook and loop fastener 0510 1308 1 36 Screw 3 0x8 mm panhead 0515 1079 8 37 Screw 3 0x8 mm flathead 0515 1459 8 38 Screw 4 0x8 mm flathead 0515 1367 7 39 Hex nut with lock washer 4 mm 0535 0082 3 40 Screw 3 0x 10 mm flathead 0515 1460 1 41 Flat washer 2 5 mm ID 3050 0890 6 42 Screw 2 5x8 mm panhead 0515 1548 6 43 Hex nut 3 8x32 mm 2950 0001 8 44 Connector insulator 5040 0345 7 45 Connector BNC f 1250 0186 5 46 Hex nut 15 82x32 mm 2950 0035 8 47 Rear dress panel 85640 00002 U 48 Screw 4 0x8 mm flathead 0515 1367 fi 49 RFI gasket rear 3 feet required 8160 0662 8 50 Rear frame 5021 8694 5 51 O ring 101 in ID 0900 0010 2 52 Center deck 5002 0602 9 HP 85640A RF Tracking Generator Operation and Service Manual Assembly Replaceable Parts 6 5 4 PLACES 4 PLACES 2151 29 24 23 25 SOS 152 C708 8 PLACES GO 3 PLACES a BENEATH A2 5 PLACES 18 4 PLACES 18 50 429 47 48 46 434445 4142 40 2 PLACES 2 PLACES Figure 6 3 Mechanical Replaceable Parts 2 of 2 6 6 Assem
50. 0 Service Information HP 85640A RF Tracking Generator Operation and Service Manual Troubleshooting the HP 85640A RF Tracking Generator Circuits The A2 tracking generator Al attenuator assemblies and A4 power supply may be replaced if they are defective these assemblies are not field serviceable The A2 tracking generator assembly is available as a rebuilt exchange assembly Refer to the rebuilt exchange assembly procedure in this chapter for more information about obtaining rebuilt factory tested assemblies Al Attenuator The A1 Attenuator is a 70 dB step attenuator with three sections that provide attenuation values of 10 20 and 40 dB The attenuator includes a dc blocking capacitor on its output to prevent damage from reverse input voltages less than 30 V dc A2 Tracking Generator The A2 tracking generator consists of several smaller circuits The A2 is not component level repairable a rebuilt exchange assembly is available Part numbers are in Table 6 1 and the rebuilt exchange assembly procedure is at the beginning of this chapter The tracking generator is unique because it recreates only onehost analyzer intermediate frequency thereby minimizing isolation problems associated with the tracking generator The function blocks of the A2 tracking generator circuitry are described below Refer to Figure 7 9 for the location of these circuits in the block diagram Tracking oscillator The tracking oscillator enables the
51. 00 MHz 2000 0 41 0 41 2500 MHz 3000 0 41 0 41 2600 MHz 3000 0 41 0 41 2700 MHz 3000 0 41 0 41 2800 MHz 3000 0 41 0 41 2900 MHz 3000 0 41 0 41 HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 15 4 Harmonic Spurious Outputs Specification Harmonic spurious lt 25 dBc outputs Related Adjustment There is no related adjustment for this performance test Description The tracking generator s RF OUTPUT is connected to the host spectrum analyzer s INPUT 509 Tracking is adjusted at 300 MHz for a maximum signal level The tracking generator s RF OUTPUT is then connected to the input of an HP 8566A B spectrum analyzer The spectrum analyzer is tuned to different frequencies and the amplitude of the second and third harmonics relative to the fundamental are measured at each frequency BNC CABLE HOST BNC CABLE SPECTRUM HP 856404 ANALYZER TRACKING GENERATOR LO SWP BLANK ING 0 5V GHz 0 5V GHz BLANKING INPUT INPUT OUTPUT g 5552079 Co S so obo COO ses 8 INPUT d 2OQOo9e 9unooo Z T Lo IST LO INPUT 502 INPUT SMA CABLE OUTPUT CAL BNC CABLE OUTPUT TYPE N CABLE CROWAVE SPECTRUM ANALYZER OSS oon ao sooo nun 6 Doc 0000 oo0o00 aaa o DDD D o0000 ZOO DD 0000 RF i omun puu nhuurauuuu INPUT S T o H CAL
52. 00000000000000000000 EV FILO 280V UL CSA 0000000000000000000000 HEWLETT PACKARD For LABORATORY USE BY D QUAL IF ED PERSONNEL CAUTION METRIC amp INCH HARDWARE CONSULT SERVICE MANUAL CAUTION FOR CONTINUED PROTECTION e e AGAINST FIRE HAZARD REPLACE FUSE ONLY SAME TYPE AND RATING ALC 3 4 Operation EXT ALC BLANKING 0 5v GHz ALC INPUT INPUT INPUT EXIT ell le J EXT ALC BLANK ING 0 5V GHz NPUT INPUT INPUT wk210 Figure 3 2 HP 85640A Rear Panel Feature Overview HP 85640A RF Tracking Generator Operation and Service Manual HP 85640A and Host Spectrum Analyzer Connections One SMA cable and three BNC cables connect the tracking generator to a host spectrum analyzer as shown in Figure 3 3 and Figure 3 4 Table 3 3 HP 85640A and Host Spectrum Analyzer Connections Tracking Generator to Spectrum Analyzer Front panel connections IST LO INPUT to IST LO OUTPUT 300 MHz INPUT to CAL OUTPUT Rear panel connections 0 5 V GHz INPUT to LO SWP 0 5V GHz OUTPUT BLANKING INPUT to BLANKING OUTPUT or BLKG GATE OUTPUT gau Pl aa gramm INSTRUMENT STATE n CONTROL Jl UU En UU UU loo c
53. 1 Tracking Generator Power over Specified Frequency Range 5 Connect the DUT as shown in Figure 3 22 Figure 3 23 shows the corresponding display HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 21 3 22 Operation go i32 pa ereu st OUTPUT LEVEL dam o pa CHE FG H um DEVICE UNDER TEST wk252 Figure 3 22 System Setup for Transmission Measurement ATTEN 10dg RL OdBm 10087 START OHz STOP 2 900GHz RBW 2 0MHz VBW 3 0MHz SWP 60ms Figure 3 23 Display of DUT Response HP 85640A RF Tracking Generator Operation and Service Manual 6 Because this test is for bandpass filter rejection only tune the spectrum analyzer so the filter s roll off takes up most of trace on the display Set the start frequency to 1 MHz and the stop frequency to 1 GHz as shown in Figure 3 24 ATTEN 10dg RL OdBm 10087 START 1 0MHz STOP 1 0000GHz RBW 2 0MHz VBW 3 0MHz SWP Soms Figure 3 24 Adjusting the Spectrum Analyzer for Measurement Requirements Note HP 8561A and HP 8562A B spectrum analyzers do not have tracking generator related keys Sweep time settings during a stimulus response measurement are highly dependent on the device under test Any changes to resolution bandwidth
54. 1 kHz On the HP 8566A B press PEAK SEARCH SIGNAL TRACK ON Wait for the signal to be centered on the display Press SIGNAL TRACK OFF On the HP 8566A B press PEAK SEARCH PRESEL PEAK Wait for the disappear Record the HP 8566A B marker amplitude below message to LO feedthrough at 3 911 GHz dBm Measurement uncertainty lt 2 02 2 50 dB Set the host spectrum analyzer CENTER FREQ to 2 9 GHz Set the HP 8566A B CENTER FREQUENCY to 6 8107 GHz On the HP 8566A B press PEAK SEARCH SIGNAL TRACK ON Wait for the signal to be centered on the display Press SIGNAL TRACK OFF On the HP 8566A B press PEAK SEARCH PRESEL PEAK Wait for the message to disappear Record the HP 8566A B marker amplitude below LO feedthrough at 6 8107 GHz dBm Measurement uncertainty lt 2 10 2 67 dB HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 27 7 Tracking Generator Feedthrough Specification Tracking generator feedthrough 300 kHz to 1 MHz 95 dBm 1 MHz to 2 0 GHz lt 115 dBm 2 0 GHz to 2 9 GHz 110 dBm Related Adjustment There is no related adjustment for this performance test Description The tracking generator s RF OUTPUT is connected to the host spectrum analyzer s INPUT 509 Tracking is adjusted at 300 MHz for a maximum signal level The tracking generator s RF OUTPUT is terminated in 509 and the output power is set
55. 2 Press PRESET on the host spectrum analyzer and set the controls as follows CENTER FREQ 2 0 ccc eh rss 300 MHz SPAN luesselee eese ss ears 0 Hz RES BW lsseesss eee 300 Hz 3 If the host spectrum analyzer is an HP 8561A HP 8562A HP 8562B press SWEEP REAR PNL OUTPUT 5 V GHz FAV If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press AUX CTRL REAR PANEL 5 V GHz FAV 4 On the tracking generator set the OUTPUT LEVEL vernier knob to 5 dBm Set the OUTPUT LEVEL attenuator knob to 0 dB then adjust TRACKING ADJUST to display a maximum signal level on the host spectrum analyzer 5 Connect the CAL OUTPUT to the INPUT 500 Set the host spectrum analyzer controls as follow REFLVL ssssse e rr 10 dBm ATTEN ecccccc Rh HR Rh hara 0 dB RES BW lsseesss eee 300 Hz VIDEO BW lt Hz 6 If the host spectrum analyzer is an HP 8561A HP 8562A or HP 8562B press MARKER QN AMPLITUDE MORE REF LVL CAL If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press MKR CAL REF LVL ADJ 7 Use the knob or step keys to adjust the REF LEVEL ADJ for a marker amplitude reading of 10 00 dBm 0 17 dB 8 Connect one HP 908A 500 termination to the host spectrum analyzer s INPUT 500 and another to the tracking generator s RF OUTPUT Reconnect the BNC cable from the CAL OUTPUT to the 300 MHz INPUT on the tracking generator 9 Set the tracking g
56. 4 l4 4 a 3 18 Making a Transmission Measurement Using an HP 8561A or HP 8562A B Spectrum Analyzer 4 ll 4 4 4 Aes 9 21 Set up the System 2 ll 4 4 eh 9 21 Calibrate 4 2 2 2 ll s 4 4 4 4 as 3 26 Normalize 2 2 2 a 3 27 Measure 5 2 4 l4 4 a 3 28 Reflection Measurements 2 1 1 1 4 ll E s s 3 30 Making a Reflection Measurement Using an HP 8560A E HP 8561B E or HP 8563A E Spectrum Analyzer s leen 3 30 Set up the System 2 ll 4 4 eh 3 30 Calibrate 2 6 4 2 2 2 ll s 4 4 4 4 as 3 30 Normalize 2 2 2 a 3 35 Measure a a 3 36 Making a Reflection Measurement Using an HP 8561A or HP 8562A B Spectrum Analyzer 4 4 4 4 4 444 s 3 37 Set up the System 2 ll 4 4 eh 3 37 Calibrate 2 6 4 2 2 2 ll s 4 4 4 4 as 3 38 Normalize 2 2 2 a 3 40 Measure 5 2 4 l4 4 a 3 40 Performance Tests What You ll Find in This Chapter 2 0 2 llle 4 1 What is Performance Verification ee a 4 1 Before Beginning 2 2 2 25 25252525292525252525255 4 3 Test Equipment Youll Need 2 a 4 3 Recording Test Results 2 2 lll 44s 4 3 1 Output Attenuator Accuracy 4 l l ee ee 4 6 2 Maximum Leveled Output Power lll leen 4 9 3 Level Flatness 2 2 4 4 4 4 4 s 4 12 4 Harmonic Spurious Outputs llle 4 16 5 Non Harmon
57. 500 BRIDGE UNDER TERMINAT ION TEST wk257 Figure 3 43 System Setup for a Reflection Measurement 3 38 Operation HP 85640A RF Tracking Generator Operation and Service Manual 5 Adjust the tracking generator s output power with the OUTPUT LEVEL controls increase the output power 6 dB by setting the attenuator right hand knob to 0 dBm and the vernier left hand knob to 4 dBm This output power level differs from the level used for the transmission measurement example because a 6 dB coupler is used in the reflection measurement setup 6 Adjust the host analyzer s settings according to the measurement requirements For this measurement set the analyzer to frequencies around the minimum reflection region of the filter Change the start frequency to 1 MHz and the stop frequency to 1 GHz Figure Figure 3 44 shows what should appear on the display ATTEN 10dgB RL OcdEBm 100B Lo d STOP 1 0poo GHz START 300kH Hz STOP 4 00000Hz RBW 2 o0MHz VBW 3 0MHz SWP DOms Figure 3 44 Spectrum Analyzer Display of Bandpass Filter Region Note Unlike the thru reference trace an open short average reference trace cannot be performed from the front panel of an HP 8561A or HP 8562A B However this measurement can be done via remote operation The program should perform the following steps 1 Read the open trace 2 Read the short trace 9 Average the two traces 4
58. 8562A B or HP 8563A E Microwave frequency counter lt ee rn HP 5343A Alignment tool nonmetallic 2 0 0 0 0 cece ene teenies 8710 0033 Cables BNC 122 cm 48 in 2 required 6 0 6 cc teen teenies HP 10508A BNC 62 em 24 in 3 required 06 cette net n ne nnno 8120 1839 SMA 52 cm 20 In 5061 9038 Adapter Type N m to BNC f 0 ccc cence hh 1250 1476 Procedure 1 Remove the cover from the tracking generator refer to Removing and Replacing the Instrument Cover in Chapter 7 Connect the equipment as shown in Figure 5 7 Also connect a BNC cable between the frequency counter FREQ STD OUT and the host spectrum analyzer 10 MHz REF IN OUT Set the tracking generator LINE switch to ON and allow it to warm up for at least 10 minutes 2 Press PRESET on the host spectrum analyzer and set the controls as follows CENTER FREQ 2 eI 300 MHz SPAN 0 Hz 5 16 Adjustment Procedures HP 85640A RF Tracking Generator Operation and Service Manual 3 4 5 4 Tracking Oscillator Range Adjustments If the host spectrum analyzer is an HP 8561A HP 8562A or HP 8562B press SWEEP REAR PNL OUTPUT 5 V GHz FAV FREQuENcY MORE 10 MHz EXT SINGLE If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press AUX CTRL REAR PANEL 0 5 V GHz FAV 10 MHz EXT SGL SWP Fine Adjustment Set the microwave frequency counter controls as follows SAMPLE RATE eeeee RR FULLY Counterclockwise 50
59. 88 Taiwan Hewlett Packard Taiwan 8th Floor H P Building 337 Fu Hsing North Road Taipei Taiwan 886 2 712 0404 Australia Hewlett Packard Australia Ltd 31 41 Joseph Street Blackburn Victoria 3130 61 3 895 2895 Japan Yokogawa Hewlett Packard Ltd 1 27 15 Yabe Sagamihara Kanagawa 229 Japan 81 4277 59 1311 Canada Hewlett Packard Canada Ltd 17500 South Service Road Trans Canada Highway Kirkland Quebec H9J 2X8 Canada 514 697 4232 Singapore Hewlett Packard Singapore Pte Ltd 1150 Depot Road Singapore 0410 65 273 7388 Installation HP 85640A RF Tracking Generator Operation and Service Manual Operation What You ll Find in This Chapter After a quick overview of the HP 85640A RF tracking generator you ll learn about m Using front and rear panel features m Connecting the tracking generator to an HP host portable spectrum analyzer m Making a simple transmission measurement m Making a simple reflection measurement HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 1 Front Panel Features LINE SWITCH LO INPUT 300 MHz INPUT RF OUTPUT TRACKING ADJUST knob OUTPUT LEVEL knobs UNLEVELED LED Connector turns the instrument on or off The LED above the switch indicates whether or not ac power is applied to the tracking generator uses the 1st LO output from the host spectrum analyzer to drive the tuning of the tracking generat
60. 900GHz RBW 1 0MHz VBW 1 0MHz lt S5wP BOms Figure 3 7 Display of DUT Response 3 10 Operation HP 85640A RF Tracking Generator Operation and Service Manual e EAS eus go DOO tn c gt Oa 000 o eye C3 lO ORO O O EH e p ms GAT 0000 0000 0000 J HH 9 LS 5 32 NE P L E OUTPUT LEVEL im s CHE FG H um DEVICE UNDER TEST wk250 Figure 3 8 System Setup for Transmission Measurement T Access tracking generator related keys by pressing TRACKING GENRATOR 8 Set the spectrum analyzer s sweep time to stimulus response auto coupled mode by pressing SWP CPL SR SA until SR is selected In stimulus response mode the auto coupled sweep times usually are much faster for swept response measurements Stimulus response auto coupled sweep times typically are valid in stimulus response measurements where the system s frequency span is less than appears in the special functions area at the left hand side of the display screen Figure 3 9 illustrates the faster sweep time of 50 ms instead of 60 ms for the same analyzer settings HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 11 ATTEN 10dB RL OOE TOOR START OHZ STOP 2 900GHz ABW 1 0MH
61. 9107 GHz signal from the modulator goes into the RF port of the output mixer The LO port of the output mixer is driven by the HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 21 Output amplifier Bias board buffered 1st LO signal from the coupler The mixer output is then amplified The signal from the output mixer passes through the low pass filter of the output amplifier which then amplifies the signal to a usable range The amplifier also contains a detector for leveling the output The bias board houses the ALC circuitry for the tracking generator It also distributes dc power to the rest of A2 ALC inputs originate from the A3 Interface Assembly for power level control from the rear panel EXT ALC INPUT and from the output amplifier detector The ALC loop drives the modulator A3 Interface Assembly The A3 interface assembly provides control signals for the A2 tracking generator s power level and tracking oscillator A3 also monitors AZ s ALC MON ALC monitor line to check for unleveled output The A2 tracking generator 600 MHz drive signal originates on A3 300 MHz to 600 MHz converter Power level control Unlevel detector Power supply Tracking control 7 22 Service Information This circuitry receives the host spectrum analyzer s 300 MHz 10 dBm CAL OUTPUT signal The signal is doubled to 600 MHz to drive the A2 tracking generator The converter consists of two amplificati
62. Bm 2 dB HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 29 No Output Power The A2 requires power supplies a 1st LO signal and a 600 MHz drive signal in order to provide output power 1 Check power supply voltages at A3J1 and A2J1 Refer to the A3 interface assembly schematic diagram in this chapter 2 Check that ALC EXT measured at A3J1 pin 10 is a TTL low when the tracking generator is set to ALC INT and TTL high when the tracking generator is set to ALC EXT 3 Check that the 600 MHz drive signal is 8 dBm 3 5 dB If the signal is outside this range examine the A3 interface assembly 4 Check that the LO INPUT signal measures 16 dBm 2 dB If not perform the 1ST LO OUTPUT amplitude performance test for the host spectrum analyzer 5 Check the tracking adjustment controls Monitor A3U5 pin 8 with a DVM Rotate the TRACKING ADJUST control from fully counterclockwise to fully clockwise The voltage measured should increase from 0 V to gt 8 V Caution The following step requires adjustment of A2C3 The lifetime of A2C3 is rated for less than 10 cycles Do not adjust A2C3 unless it is absolutely necessary 6 If all the above checks are acceptable then the tracking oscillator may be malfunctioning a Set up the host spectrum analyzer as indicated in the tracking oscillator adjustment procedure coarse adjustment found in Chapter 5 of this manual b Use a spectrum ana
63. EE E neat tf nner START 4 0MHZ STOP 4 0000GHZz SABW 1 0 kHz vBw 300Hz 9 5wP 2 0s5ec Figure 3 25 Decrease Resolution Bandwidth to Improve Sensitivity 10 Use TRACKING ADJUST on the HP 85640A to compensate for any tracking errors see Figure 3 26 ATTEN 10dB RL OOE TOOR MES TTU START 2 0MHz STOP 4 0000GHZz SABW 300Hz vBw 300Hz 9SwP 1 7 5sec Figure 3 26 Using TRACKING ADJUST to Compensate for Tracking Error 3 24 Operation HP 85640A RF Tracking Generator Operation and Service Manual Note Tracking errors occur when the tracking generator s output frequency does not exactly match the input frequency of the spectrum analyzer The resulting product from the spectrum analyzer s input mixer is not at the center of the IF bandwidth The degradation in tracking causes a decrease of the displayed amplitude as shown in Figure 3 27 Because a small error in tracking causes a larger change in amplitude tracking errors are most noticeable in narrow resolution bandwidths Use the TRACKING ADJUST vernier knob on the HP 85640A to compensate for tracking errors Adjust the knob until the displayed signal increases to its maximum amplitude DECREASE IN A AMPL TUDE DISPLAY SHIFT DEGRADED TRACKING wk215 Figure 3 27 Tracking Error HP 85640A RF Tracking Generator Operation and Service Manual O
64. EL vernier knob to 0 dBm Set the OUTPUT LEVEL attenuator knob to 10 dB Press TRIG SINGLE on the host spectrum analyzer Note proceeding It is only necessary to perform step 7 if more than two hours have elapsed since a front panel calibration of the HP 8566A B has been performed The HP 8566A B needs to be allowed to warm up for at least 30 minutes before 7 HP Perform a front panel calibration of the HP 8566A B as follows a Connect a BNC cable between CAL OUTPUT and RF INPUT b Press 2 22 GHz INSTR PRESET then RECALL 8 Adjust AMPTD CAL for a marker amplitude reading of 10 dBm c Press RECALL 9 Adjust FREQ ZERO for maximum amplitude response d Press SHIFT FREQUENCY SPAN to start the 30 second internal error correction routine e Press sHiFT START FREQ to use the error correction factors just calculated Connect the type N cable from the tracking generator RF OUTPUT to the HP 8566A B RF INPUT as shown in Figure 4 5 85640A BF Tracking Generator Operation and Service Manual Performance Tests 4 17 4 Harmonic Spurious Outputs 9 Set the HP 8566A B controls as follows CENTER FREQUENCY eeeeeeeee hme 300 KHz SI wa OA 100 kHz REFERENCE LEVEL 5 dBm RES DBW 30 kHz 10 On the HP 8566A B do the following a f Press PEAK SEARCH and SIGNAL TRACK ON Wait for the signal to be displayed at center screen Press SIGNAL TRACK
65. ENT STATE OO 000 OO 000 O CO IO OC IA REI ca neu 509 voe OUTPUT bn Er nes fa 9 2 om g O C Co o 39 H a Ld E DIRECTIONAL OPEN BRIDGE Figure 3 37 Connect the Open HP 85640A RF Tracking Generator Operation and Service Manual wk 256 Operation 3 33 12 After connecting the open as shown in Figure 3 27 press STORE OPEN 13 The analyzer will prompt you to connect the short Figure 3 38 ATTEN 10dB MKA a47 G7dagm RL OOE TOOR 500 5MHZ Connect SHORT Average wat J U G a 3 when ready START 4 0MHZ STOP 4 0000GHZz ABW 1 0MHz VBW 1 0MHz SWP DO Figure 3 38 On Screen Prompts to Connect an Short 14 Connect the short as shown in Figure 3 39 O RTP annee sae MARKER mp CONTROL sss e G ODO aue durur ke e Iur son CJ uma O D e ae C109 C9 Luc c d H L p o U ah DIRECTIONAL SHORT BRIDGE wk255 Figure 3 39 Connect the Short 3 34 Oper
66. ER nmi een 00000 Soooo0 o 20000 S 0000 o cuu o 0000 Do annnon INPUT 590 wk221 Figure 4 2 Output Attenuator Accuracy Test Setup 4 6 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 1 Output Attenuator Accuracy Equipment Measuring receiver 0 ccc ence eee teen ence ene eee HP 8902A Host spectrum analyzer HP 8560A E 8561A B E HP 8562A 62B or HP 8568A E Cables Type N 62 cm 24 in lseeseeeeeeeeee e hen HP 11500B C BNC 62 cm 24 in 3 required 6 0 ete ent e nen 8120 1839 SMA 52 cm 20 iN 0 ccc ee hh ren 5061 9038 Procedure 1 Connect the equipment as shown in Figure 4 2 Use the type N cable to connect the tracking generator RF OUTPUT to the host spectrum analyzer s INPUT 509 2 Press PRESET on the host spectrum analyzer and set the controls as follows CENTER FREQ 2 0 cc RIRs 300 MHz SPAN ooo cc ce eee ee ee eee hehe eee ee 0 Hz RES BW 2 hehehe 300 Hz 3 If the host spectrum analyzer is an HP 8561A HP 8562A or HP 8562B press SWEEP REAR PNL OUTPUT 5 V GHz FAV If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press AUX CTRL REAR PANEL 5V GHz FAV 4 On the tracking generator set the OUTPUT LEVEL vernier knob to 5 dBm Set the OUTPUT LEVEL attenuator knob to 0 dB then adjust TRACKING ADJUST to display a maximum signal level on the host spectrum analyz
67. Failure to set the ac power input to the correct voltage could cause damage to the instrument when the ac power cable is plugged in Contents 1 General Information What You ll Find in This Operation and Service Manual What You ll Find in This Chapter oaoa a a a Quick Overview of the HP 85640A RF Tracking Generator Accessories Supplied 2 len RF Tracking Generators Covered by This Manual Serial Numbers 2 1 we 5555255525955 Calibration Cycle ww a aa a Specifications and Characteristics lll Table 1 1 HP 85640A Specifications 0 0 0 2 2 0 0 0 n Frequency Specifications ll ll eh Amplitude Specifications ll llle Electromagnetic Specifications llle General Specifications ll ll 4n Physical and Mechanical Specifications l l ll n 1 Table 1 2 HP 85640A Characteristics lll llle 1 Frequency Characteristics 2 a a 4 4 44s l 1 1 1 1 1 1 1 1 1 LZ o e e O A da D Ag e t e Kel Kk ek ke Kel k Kek d Amplitude Characteristics 4 2 2 2 ll 4 sen Inputs and Outputs 5 4 ll 4 l4 ss a ked m 2 Installation What You ll Find in This Chapter 2 llle 2 1 Compatibility with Portable Spectrum Analyzers ls 2 1 Initial Inspection 4 ll s A 2 2 Is the Shipment Complete
68. GHz to 2 9 MHz dBm 4 30 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 7 Tracking Generator Feedthrough Table 4 8 Tracking Generator Feedthrough Frequency Tracking Generator Noise Level Measurement Range Output Frequency Amplitude dBm Uncertainty dB 300 kHz 1 74 1 98 400 kHz 1 74 1 98 300 kHz 500 kHz 1 74 1 98 to 600 kHz 1 74 1 98 1 MHz 700 kHz 1 74 1 98 800 kHz 1 74 1 98 900 kHz 1 74 1 98 1 MHz 1 74 1 98 1 01 MHz 1 74 1 98 2 MHz 1 74 1 98 5 MHz 1 74 1 98 10 MHz 1 74 1 98 20 MHz 1 74 1 98 50 MHz 1 74 1 98 1 MHz 100 MHz 1 74 1 98 to 299 MHz 1 74 1 98 2 0 GHz 500 MHz 1 74 1 98 700 MHz 1 74 1 98 899 MHz 1 74 1 98 1100 MHz 1 74 1 98 1300 MHz 1 74 1 98 1499 MHz 1 74 1 98 1700 MHz 1 74 1 98 1900 MHz 1 74 1 98 2000 MHz 1 74 1 98 2001 MHz 1 74 1 98 2099 MHz 1 74 1 98 2 0 GHz 2300 MHz 1 74 1 98 to 2500 MHz 1 74 1 98 2 9 GHz 2699 MHz 1 74 1 98 2800 MHz 1 74 1 98 2900 MHz 1 74 1 98 HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 31 8 Frequency Tracking Range Characteristic Tracking range gt 5 kHz referenced to output frequency after TRACKING ADJUST is optimized Characteristic Related Adjustmen
69. Harmonic spurious 300 kHz to 2 9 GHz lt 25 dBe Non harmonic spurious 300 kHz to 2 0 GHz lt 27 dBe 2 0 GHz to 2 9 GHz lt 23 dBc LO feedthrough 3 9 GHz to 6 8 GHz 26 dBm Dynamic Range Tracking generator feedthrough Spectrum analyzer set to 300 Hz resolution bandwidth and 0 dB input attenuation 300 kHz to 1 MHz 95 dBm 1 MHz to 2 0 GHz 115 dBm 2 0 GHz to 2 9 GHz 110 dBm Leakage measured on spectrum analyzer with tracking generator delivering maximum leveled output power into a 500 termination and spectrum analyzer input terminated in 500 HP 85640A RF Tracking Generator Operation and Service Manual General Information 1 7 Electromagnetic Specifications Electromagnetic Compatibility Military specification Conducted emissions CEO1 narrowband CE03 narrowband CEO broadband Conducted susceptibility CS01 C802 CS06 Radiated emissions REOI REO2 Radiated susceptibility RS03 RS01 RS02 Conducted and radiated interference complies with CISPR Publication 11 1985 and Messempfaenger Postverfuegung 526 527 79 Kennzeichnung Mit F Nummer Funkschutzzeichen Meets the requirements of MIL STD 461B Part 4 with the exceptions shown below 1 kHz to 15 kHz only Full limits 20 dB relaxation from 15 kHz to 100 kHz Full limits Full limits Full limits 15 dB relaxation of 30 KHz exceptioned from 30 kHz to 50 kHz Full limits to 1 GHz Limited to 1
70. Lo swp SHOWN IN SERVICE POSITION BLANK ING 0 5V GHz 0 5V GHz BLANK ING INPUT INPUT aaa G Q CO opoooo MICROWAVE 5 DM acann FREQUENCY COUNTER ER 00060 Q sss 8 a o O 60 DU Oaa a gun 000 i RF OUTPUT 300 LO IST LO CAL 000 ooo 5 MHZ INPUT OUTPUT OUTPUT 203 B88 G NPUT SMA CABLE 10Hz TO ADAPTER ONUS BNC CABLE BNC CABLE wk235 Figure 5 7 Tracking Oscillator Range Adjustment HP 85640A RF Tracking Generator Operation and Service Manual Adjustment Procedures 5 15 4 Tracking Oscillator Range Adjustments R1 COR TRACK AS INTERFACE ASSEMBLY 85640 6000 00 Of Oho TT H ne NI Bram ac po U 0 0 i i F g g T y 0 0 Tri 00 d nul q L b t oO A2C3 pal olf Ogg COS E LOCATED o A1 6 ATTENUATOR 0 l A2 E e l Mo penne E T o gh SE E E wk236 Figure 5 8 Tracking Oscillator Range Adjustment Locations Equipment Host spectrum analyzer HP 8560A E HP 8561A B E HP
71. NC female rear panel Low TTL level High TTL level EXT ALC INPUT Connector BNC female rear panel Impedance gt 10 kQ Polarity Negative RF OUTPUT Connector Type N female front panel Impedance 500 Maximum safe reverse level Output VSWR 30 dBm 30 V de See Table 1 1 HP 85640A Characteristics Amplitude Characteristics Effective Source Match 1 12 General Information HP 85640A RF Tracking Generator Operation and Service Manual Installation What You ll Find in This Chapter This chapter explains how to set up the HP 85640A tracking generator for operation You ll also find m Serial numbers of host spectrum analyzers that can be used with the tracking generator m Line power and line fuse requirements m Illustrations of front and rear panel connections m HP sales and service office addresses Compatibility with Portable Spectrum Analyzers The HP 85640A is compatible with these portable spectrum analyzers Table 2 1 Host Spectrum Analyzer to Tracking Generator Compatibility Spectrum Analyzer Model Numbers Serial Number HP 8560A all serials of non Option 002 HP 8560E all serials of non Option 002 HP 8561A all serials HP 8561B all serials HP 8561E all serials HP 8562A all serials HP 8562B all serials HP 8563A all serials HP 8563E all serials HP 85640A RF Tracking Generator Operation and Service Manual Installation 2 1 Initial Inspection Is the Sh
72. Notice Hewlett Packard to Agilent Technologies Transition This manual may contain references to HP or Hewlett Packard Please note that H ewlett Packard s former test and measurement semiconductor products and chemical analysis businesses are now part of Agilent Technologies To reduce potential confusion the only change to product numbers and names has been in the company name prefix where a product name number was HP XXXX the current name number is now Agilent XXXX For example model number H P 8648 is now model number Agilent 8648 Contacting Agilent Sales and Service Offices The sales and service contact information in this manual may be out of date The latest service and contact information for your location can be found on the Web at http www agilent com find assist If you do not have access to the Internet contact your field engineer In any correspondence or telephone conversation refer to your instrument by its model number and full serial number OG Agilent Technologies Printed in USA July 2004 HP 85640A RF Tracking Generator Operation and Service Manual D HEWLETT PACKARD Printed in USA Notice The information contained in this document is subject to change without notice Hewlett Packard makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchantability and fitness for a particular purpose Hewlett Packard shall not be liable for e
73. Pe abr me START 2 0MHz STOP 4 0000GHZz SABW 300Hz vBw 300Hz SWP 1 78e0 Figure 3 12 Using Tracking Adjust to Compensate for Tracking Error HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 13 Note Tracking errors occur when the tracking generator s output frequency does not exactly match the input frequency of the spectrum analyzer The resulting product from the spectrum analyzer s input mixer is not at the center of the IF bandwidth The degradation in tracking causes a decrease of the displayed amplitude as shown in Figure 3 13 Because a small error in tracking causes a larger change in amplitude tracking errors are most noticeable in narrow resolution bandwidths Use the TRACKING ADJUST vernier knob on the HP 85640A to compensate for tracking errors Adjust the knob until the displayed signal increases to its maximum amplitude DECREASE IN A AMPL TUDE DISPLAY SHIFT DEGRADED TRACKING wk215 Figure 3 13 Tracking Error 3 14 Operation HP 85640A RF Tracking Generator Operation and Service Manual Calibrate Notice that the output power of the tracking generator is not perfectly flat as previously shown in Figure 3 6 This is due in part to the frequency response error inherent in all scalar network measurement systems Normalization is a technique used to eliminate frequency response errors thereby increasing the amplitude a
74. Power level adjustments 3 Tracking oscillator range adjustments 4 A4 power supply assembly Power supply adjustments and checks 1 A5 line filter switch assembly None N A Table 5 3 Adjustable Components Reference Adjustment Adjustment Designator Name Number Adjustment Description 15V ADJ 15V ADJ 1 Adjusts the 15 V dc supply voltage 15V ADJ 15V ADJ 1 Adjusts the 15 V dc supply voltage A2C3 TRACK OSC 4 Sets center frequency of tracking oscillator A3RI COR TRACK 4 Coarse adjustment of TUNE voltage to tracking oscillator A3R2 S T GAIN 3 Adjusts gain of sweep plus tune voltage for slope flatness compensation A8R3 LVL OFFSET 3 Sets output level at 20 dBm setting A3R4 LVL GAIN 3 Sets output level at 10 dBm setting Table 5 4 Factory Selectable Component Reference Adjustment Designator Number Basis of Selection A3UA 2 Sets 600 MHz level at A3J5 to 8 dBm 1 dB HP 85640A RF Tracking Generator Operation and Service Manual Adjustment Procedures 5 3 1 Power Supply Adjustments and Checks Assembly Adjusted A4 power supply Related Performance Test There is no related performance test for this adjustment Description The 15 V and 15 V supplies are adjusted The adjustments are located on A4 power supply but the measurements are made on the A3 interface assembly Other voltages on the interface assembly are also checked Caution The tracking generator assemblies are static sensitiv
75. Put the average trace into trace B For more information refer to the host analyzer s operating and programming manual and to the HP 856204 Mass Memory Module Operating and Programming Manual 7 On HP 8561A and HP 8562A B host analyzers an open short average reference trace can only be performed via remote operation see note If a controller is not available steps 8 through 10 will establish a reference trace using only a short 8 Remove the DUT Replace it with a short 9 Press TRACE B CLR WRT B Wait for a new sweep to finish Press VIEW B 10 For future reference store the short trace in a trace register Press savE SAVE TRACE B TRACE n where n is the number of the trace register HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 39 Note If SAVE LOCK i is on pressing TRACE n on an HP 8561A 62A causes the message to appear in the active function area If this happens press SAVE SAVELOCK OFF SAVE TRACE B TRACE n Normalize 11 12 13 Reconnect the DUT To normalize activate the trace math function A B DL A by pressing TRACE MORE Press A B DL A ON OFF until ON is selected If necessary make adjustments to the position of the trace by changing the position of the display line Access the display line by pressing DISPLAY DSPL LIN ON OFF The preset value of the display line is 0 dBm Measure 14 3 40 Read the return loss by activating t
76. R CM INCHES 2504 8120 1351 Straight BS1363A 229 90 Mint Gray Great Britain U 8120 1703 90 229 90 Mint Gray Cyprus Nigeria E Rhodesia co Lt L N Singapore So Africa India 250V 8120 1369 Straight NZSS198 ASC112 201 79 Gray Australia S 8120 0696 90 221 87 Gray New Zealand 250V 8120 1689 Straight cEE7 Y11 201 79 Mint Gray East and West 8120 1692 90 201 79 Mint Gray Europe Saudi c Arabia United Arab Republic C3 unpolarized in many nations 125V 8120 1348 Straight NEMA5 15P 203 80 Black United States 8120 1398 90 203 80 Black Canada 8120 1754 Straight NEMA5 15P 91 36 Black Japan 100 V or 200 V 8120 1378 Straight NEMA5 15P 203 80 Jade Gray Mexico 8120 1521 90 203 80 Jade Gray Philippines 8120 1676 Straight FNEMAS 15P 91 36 Jade Gray Taiwan 250V 8120 2104 Straight SEV1011 201 79 Gray Switzerland 1959 24507 Type 12 2204 8120 0698 Straight NEMA6 15P 250V 8120 1860 Straight CEEE22 VI E Earth Ground L Line N Neutral x Part number for plug is industry identifier for plug only Number shown for cable is HP Part Number for complete cable including plug wk25 Figure 2 2 AC Power Cables Available Installation HP 85640A RF Tracking Generator Operation and Service Manual Connecting an HP 85640A to a Compatible S
77. Ta al ug U d jJ Go wk29 Figure 3 1 Front Panel Feature Overview HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 3 Rear Panel Features Input power ALC INT EXT EXT ALC INPUT BLANKING INPUT 0 5V GHZ INPUT The appropriate power cable is included with your tracking generator Connect the main power plug only to a socket outlet that has protective ground contact allows you to select between internal and external leveling allows you to form an external leveling loop using a negative polarity detector uses the spectrum analyzer s blanking output to deactivate the unleveled LED during retrace uses the 0 5 V GHz output from the spectrum analyzer for flatness compensation Table 3 2 Rear Panel Interconnections Connector Amplitude Voltage Limits EXT ALC INPUT BNC female BLANKING INPUT BNC female 0 5 V GHz INPUT BNC female U to 1 V operating 15 V damage level TTL high during retrace TTL low during sweep 0 5 V GHz of tuned frequency HP 85640A PORTABLE TRACKING GENERATOR 1154 47 55 Hz 230V 47 55 Hz WARNING THE PROTECTIVE EARTH GROUNDING ON THIS EQUIPMENT MUST BE MAINTAINED TO PROVIDE PROTECTION FROM ELECTRIC SHOCK NO USER SERVICABLE PARTS INSIDE REFER DO OO OO O OOOO OOOOOOOOOOO00 SERVICE TO QUALIFIED SERVICE PERSONNEL O 000000000000000 Fuse cose dois 2504 ike 900
78. acking generator Chapter 7 Service Information describes replacement procedures suggests methods for troubleshooting and explains how to return the instrument for service or repair In this chapter you ll also find lists of component level replaceable parts instrument block diagrams and schematic and component location diagrams for the A3 interface assembly What You ll Find in This Chapter This chapter introduces you to the HP 85640A RF tracking generator Figure 1 1 shows the accessories supplied with the instrument at shipment Table 1 1 HP 85640 Specifications and Table 1 2 HP 85640 Characteristics describe the instrument s performance under specified conditions HP 85640A RF Tracking Generator Operation and Service Manual General Information 1 1 Quick Overview of the HP 85640A RF Tracking Generator The HP 85640A RF tracking generator provides a tracking source covering the 300 kHz to 2 9 GHz frequency range It is compatible with HP 8560A E HP 8561A B E HP 8562A B and HP 8563A E spectrum analyzers A 70 dB step attenuator combined with an 11 dB vernier provide continuously variable output power levels from 0 dBm to 80 dBm The tracking generator s output frequency is controlled by the spectrum analyzer The front panel tracking control enables the tracking generator s output frequency to be matched exactly to the spectrum analyzer input frequency minimizing tracking errors Tracking errors appear as a decre
79. ally by using a negative polarity crystal detector A rear panel switch on the tracking generator can be used to select between internal and external leveling The EXT ALC INPUT connector on the rear panel routes the detector output directly to the A2 tracking generator assembly ECTRUM A ALYZ ER LOW B I INPUT LOW PASS FIRST SECOND THIRD RESOLUTION ENVELOPE CRT ATTENUATOR FILTER MIXER CONVERTER CONVERTER BW FILTER DETECTOR DRIVER CRT INPUT 508 Xo Xo VERT I KLAK OL KN LK Y K NL Xo HORIZ 3 9107 310 7 MHz 10 7 MHz GHz THIRD LO SWEEP I 2 500 MHz GENERATOR SECOND LO UN 3 6 GH FIRST LO 75 l 3 9107 TO 6 8107 GHz 1ST LO CAL DEVIGE OUTPUT OUTPUT ES 300 MHz V LO INPUT INPUT TRACK ING GENERATOR gt x2 A ao i I OUTPUT OUTPUT LEVEL LEVEL 600 MHz TRACK ING 1 ATTENUATOR VERNIER I I i y p N lt vR la x2 I RF OUTPUT V N I 0 TO 2 9 GHz 3 9107 GHz 782 14 MHz 182 14 MHz 91 07 MHz I I I 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 wk247 Figure 7 8 Simplified HP 85640A to Host Spectrum Analyzer System Block Diagram HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 19
80. amine the tracking generator s output power by connecting its RF OUTPUT directly to the spectrum analyzer s INPUT 509 On the spectrum analyzer press PRESET FREQUENCY START FREQ 300 kHz STOP FREQ 2 9 GFZ Select the 0 5 V GHz OUTPUT on the spectrum analyzer by pressing REAR PANEL 5V GHZ FAV E On an HP 8560E HP 8561E or HP 8563E press GATE OFF Adjust the tracking generator s output power with the OUTPUT LEVEL controls set the output power of the tracking generator to 10 dBm by setting the attenuator right hand knob to 10 dBm and the vernier left hand knob to 0 dBm The filter we are testing will not be damaged by the 10 dBm power level Figure 3 6 shows the spectrum analyzer display with these settings Note Although the displayed start frequency annotation was set to 300 kHz notice that it remains at O Hz This is due to the resolution of the display If the stop frequency is decreased to 1 GHz the start frequency reads 300 kHz HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 9 ATTEN 10dg RL OdBm 10087 START o HE START OHZ STOP 2 89800GHz RBW 1 0MHz VBW 1 0MHz SwWP 60ms Figure 3 6 Tracking Generator Power over Specified Frequency Range 6 Connect the DUT as shown in Figure 3 8 Figure 3 7 shows the corresponding display ATTEN 10dg RL OdBm 10087 START OHz STOP 2
81. ance Tests 4 19 5 Non Harmonic Spurious Outputs BNC CABLE HOST BNC CABLE SPECIRU HP 85640A ANALYZER TRACKING GENERATOR LO SWP BLANK ING 0 5V cHz 0 5V GHz BLANK ING INPUT INPUT RF OUTPUT wo lodo ooo INPUT AO eur IST LO INPUT 500 SMA CABLE OUTPUT J CAL BNC CABLE OUTPUT TYPE N CABLE CROWAVE SPECTRUM ANALYZER O v 00005 ob goood S con d oooh Qo q o JL dL D o0 CO DD DD racc G aaa o DDD D oo0000 goo DD 0000 RF 79 Oaa ood 00 0000 INPUT j oo o CAL OUT ADAPTER BNC CABLE J wk225 Figure 4 6 Non Harmonic Spurious Outputs Test Setup Equipment Host spectrum analyzer HP 8560A E 8561A B E HP 8562A B or HP 8568A E Microwave spectrum analyzer seseeeee e ae HP 8566A B Cables Type N 62 em 24 in 2 required eese HP 11500B C BNC 62 cm 24 in 3 required 6 0 6 cette tne nen 8120 1839 SMA 52 cm 20 in 2 cc ene cent teen eens 5061 9038 BNC 28 em 8in 2 ee rns HP 10502A Adapters Type N m to BNC TP 1250 1476 4 20 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 5 Non Harmonic Spurious Outputs Procedure 1 Connect the equipment as shown in Figure 4 6 Use the type N cable to connect the trac
82. ase in the displayed signal amplitude when the resolution bandwidth of the spectrum analyzer signal is decreased The HP 85640A can be leveled externally with a negative polarity detector improving effective source match A rear panel switch selects between internal and external leveling 1 2 General Information HP 85640A RF Tracking Generator Operation and Service Manual Accessories Supplied G uu 225408 no Siza 90Hz PACKARD RF TRACKING GENERATOR OUTPUT LEVEL dBm UNLEVELED e INPUT RF OUTPUT Accessories some not shown HP Part Number 3 cables with BNC m connectors 8120 1839 1 cable with SMA m connectors 5061 9038 2 fuses 1A 250V UL CSA for 100 120V operation 2110 0823 or 2 fuses 0 5A 250V IEC for 220 240V operation 210 0824 Figure 1 1 HP 85640A with Accessories Supplied HP 85640A RF Tracking Generator Operation and Service Manual General Information 1 3 RF Tracking Generators Covered by This Manual This manual applies to tracking generators with the serial number prefixes listed inside the title page Serial Numbers Hewlett Packard makes frequent improvements to its products to enhance their performance usability or reliability Hewlett Packard service personnel have access to complete records of design changes to each type of equipment based on the equipment s serial number Whenever you contact Hewlett Packard about your
83. atic Safe Workstation PC Board Assemblies and Electronic Components Caution Handle these items onty at a static safe work station Store or transport these items only in static shielding containers Personnel should be grounded with a resistor isolated wrist strap before touching any connector pins or before removing any assembly from the instrument Be sure that all instruments are properly earth grounded to prevent buildup of static charge 7 2 Service Information HP 85640A RF Tracking Generator Operation and Service Manual Table 7 1 Static Safe Accessories HP Part Number Description 9300 0797 Set includes 3M static control mat 0 6 m x 1 2 m 2 ft x 4 ft and 4 6 cm 15 ft ground wire The wrist strap and wrist strap cord are not included They must be ordered separately 9300 0980 Wrist strap cord 1 5 m 5 ft 9300 1383 Wrist strap black stainless steel without cord has four adjustable links and a 7 mm post type connection 9300 1169 ESD heel strap reusable 6 to 12 months HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 3 Returning the RF Tracking Generator for Service Repackage the tracking generator in the original packaging materials or with commercially available materials as described in steps 3 4 and 5 1 Fill in a blue service tag located at the back of this manual and attach it to the instrument Please be as specific as possible a
84. ation HP 85640A RF Tracking Generator Operation and Service Manual 15 Press AVERAGE SHORT The analyzer takes the average of the open and short traces then stores the averaged trace in the analyzer s internal memory and in trace B The corresponding state information is stored in state register 8 Note If SAVE LOCK is on pressing AVERAGE SHORT causes the message OM to appear in the active function area If this happens press a SAVE LOCK OFF b AUX CTRL TRACKING GENERATOR SOURCE CAL MENU CAL SHORT STORE SHORT Normalize 16 Reconnect the DUT and normalize by pressing NORMLIZE ON OFF until ON is selected The normalized trace is shown in Figure 3 40 In this case NORM REF POSN was adjusted for better viewing of the signal ATTEN 10dB MKR EO D AL OOE TOOR 500 5MHZ START 2 0MHz STOP 4 0000GHZz ABW 1 0MHz VBW 1 0MHz SWP DO Figure 3 40 Normalized Return Loss Measurement HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 35 Measure 17 Read the return loss by activating the marker Press MKR Use the analyzer s knob to position the marker at the frequency of interest See Figure 3 41 ATTEN 100B MKR 24 0dB AL odB 109B 317 4MHz MKR 347 4 MHz 2a o dB i N E START 41 0MHz STOP 4 0000Guz ABW 1 0MHz VBW 1 0MHz SWP 5o
85. ation is explained in HP 85640A Block Diagram Circuit Descriptions below The tracking generator amplifies the 300 MHz CAL OUTPUT signal from the host spectrum analyzer and doubles it to 600 MHz The 91 07 MHz tracking oscillator VCXO output is doubled to 182 14 MHz then mixed with the 600 MHz signal The sum of these two signals 782 14 MHz is multiplied by five to generate 3 9107 GHz Notice that 3 9107 GHz is the same frequency as the host spectrum analyzer s first IF The 3 9107 GHz signal is applied to a modulator which levels the output and provides fine adjustment of the output power level using the OUTPUT LEVEL vernier The modulator output is mixed with the 1st LO signal from the host spectrum analyzer and amplified Since the host spectrum analyzer s 1st LO is always greater than the tuned frequency by 3 9107 GHz the 1st IF and the tracking generator mixes this 1st LO signal with 3 9107 GHz the tracking generator output frequency will be the same as the host spectrum analyzer s tuned frequency The spectrum analyzer s 1st IF does not need to be exactly 3 9107 GHz as long as the tracking generator s 1st IF is equal to the 1st IF of the host spectrum analyzer Use the TRACKING ADJUST control to set the tracking generator s 1st IF equal to the analyzer s 1st IF The output power of the HP 85640A RF tracking generator can be adjusted in 10 dB steps using the 70 dB step attenuator HP 85640A Block Diagram Circuit Descriptions
86. ay a maximum signal level on the host spectrum analyzer Note It is only necessary to perform step five if more than two hours have elapsed since a front panel calibration of the HP 8566A B has been performed The HP 8566A B should be allowed to warm up for at least 30 minutes before proceeding b Perform a front panel calibration of the HP 8566A B as follows 4 26 Performance Tests a Connect a BNC cable between CAL OUTPUT and RF INPUT b Press 2 22 GHz INSTR PRESET RECALL 8 Adjust AMPTD CAL for a marker amplitude reading of 10 dBm c Press RECALL 9 Adjust FREQ ZERO for a maximum amplitude response d Press SHIFT FREQUENCY SPAN to start the 30 second internal error correction routine e Press sHiFT START FREQ to use the error correction factors just calculated Connect the type N cable from the tracking generator output to the HP 8566A B RF INPUT See Figure 4 7 Set the tracking generator OUTPUT LEVEL vernier knob to 0 dBm and the OUTPUT LEVEL attenuator knob to 10 dB Set the host spectrum analyzer CENTER FREQ to 300 KHz HP 85640A RF Tracking Generator Operation and Service Manual 10 11 12 13 14 15 16 6 LO Feedthrough Amplitude Set the HP 8566A B controls as follows CENTER FREQUENCY eeeeeeee hne 3 911 GHz SPAN essseeeseeee ee mH e HH e I e e 100 kHz REFERENCE LEVEL eeeeeee IRI hem 0 dBm RES BW oo eh hm me arara
87. ay 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 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE Exclusive Remedies THE REMEDIES PROVIDED HEREIN ARE BUYER S SOLE AND EXCLUSIVE REMEDIES HP SHALL NOT BE LIABLE FOR ANY DIRECT INDIRECT SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY Assistance Product maintenance agreements amd other customer assistance agreements are available for Hewlett Packard products For any assistance contact your nearest Hewlett Packard Sales and Service Office Safety Symbols The following safety symbols are used throughout this manual Familiarize yourself with each of the symbols and its
88. bly Replaceable Parts 26 2 PLACES 29 33 2 PLACES 5 2 PLACES BENEATH BOTTOM SHIELD 22 56 3 PLACES WHEN SHIELD IS IN PLACE 37 4 PLACES WHEN SHIELD IS IN PLACE 58 4 PLACES 39 3 PLACES wk240 HP 85640A RF Tracking Generator Operation and Service Manual Service Information What You ll Find in This Chapter This chapter tells you how to service the tracking generator m How to avoid damage from electrostatic discharge m How to replace assemblies in the instrument m What to do if you have a problem with the tracking generator You ll also find m system level block diagram m An instrument level block diagram m An instrument level wiring diagram m An A3 interface assembly component level replaceable parts list m An A3 interface assembly component location diagram m An A3 interface assembly schematic diagram HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 1 Electrostatic Discharge Electrostatic discharge ESD can damage or destroy electronic components All work performed on assemblies containing electronic components should be done only at a static safe work station Building Ground P ns 1 MQ Resistor Table Building Ground zt Resistor 1 MQ Heel Strap Floor Mat wk241 Figure 7 1 A St
89. bout the nature of the problem Include m Any error messages that appeared on the display m A completed performance test record m Any other information about the performance of the instrument Wrap the instrument in anti static plastic to reduce the possibility of damage caused by electrostatic discharge Caution Tracking generator damage can result from using packaging materials other than those specified Never use styrene pellets in any shape as packaging materials They do not adequately cushion the equipment or prevent it from shifting in the carton Pellets cause equipment damage by generating static electricity Use the original materials see Figure 7 2 or a strong shipping container of double walled corrugated cardboard with 159 kg 350 Ib bursting strength The carton must be large enough and strong enough to accommodate the instrument and to allow at least three to four inches on all sides of the instrument for packing material Surround the equipment with at least three to four inches of packing material use enough to prevent the equipment from moving in the carton If rigid packing foam is unavailable you may use any anti static brand of bubble packaging sheet plastic formed with air filled bubbles Wrap the equipment several times in this material to protect the equipment and to keep it from moving in the carton 5 Seal the shipping container securely with strong nylon adhesive tape Mark the sh
90. c to 15 V de Accuracy x10 mV on 100 V range Input impedance gt 1 MQ Frequency range 300 kHz to 2 9 GHz Insertion loss 6 dB nominal Output tracking 0 25 dB Equivalent output SWR 1 22 HP 8566A B HP 5343A Option 001 HP8902A HP 8482A HP 3456A HP 11667A PT PAT PAT H PAT A T PAT P Performance tests A Adjustments T Troubleshooting Part of microwave workstation 4 4 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual Table 4 2 Recommended Test Equipment continued Instrument Critical Specifications Recommended Use for Equipment Substitution Model DVM test leads 236 inches alligator clips probe tips HP 34118A A T Termination Frequency range dc to 2 9 GHz HP 908A BA Impedance 500 Maximum SWR 1 05 Connector Type N Adapters BNC f to SMB f HP 1250 1236 A Type N f to APC 3 5 f HP 1250 1745 P Type N m to BNC f HP 1250 1476 BA Cable RG 214 U Connectors Type N m HP 11500B C BA two required Length gt 61 cm 24 in Cable 509 Coaxial Connectors BNC m HP 10502A BA two required Length gt 23 em 9 in Cable 509 Coaxial Connectors BNC m HP 10508A BA two required Length gt 122 em 48 in Cable Frequency range dc to 300 MHz HP 8120 1839 BA three required Connectors BNC m both ends Length gt 62 cm 24 in Cable Frequency range 3 9 to 6 9 GHz HP 5061 9038 PA T Maximum SWR
91. calculates the fastest sweeptime for stimulus response measurements assuming the span is less than 20 times the bandwidth for the DUT 1 Note the autocoupled sweeptime 2 Calculate each of the following a span Hz 156 GHz b 500 resolution bandwidth Hz c 200 video bandwidth Hz 3 Determine the greatest of the values in steps 2a 2b and 2c 4 Set sweeptime to the smaller of the values in steps 1 and 3 The analyzer will limit sweeptime to 50 msec or less in non zero spans If the value in step 4 is less than the auto coupled sweeptime the indicator will be displayed this message may be ignored as it has no effect on the outcome of the measurement HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 37 Calibrate 4 Connect the DUT as shown in Figure 3 43 The corresponding display is illustrated in Figure 3 42 ATTEN 10dg RL OdBm 10087 Emp AA b 2 9 po GHz START OHz STOP 2 900GHz RBW 2 0MHz VBW 3 0MHz SWP 60ms Figure 3 42 Display with the System Configured for a Reflection Measurement DON DIRECTIONAL DEVICE
92. ccuracy of the measurement Before normalizing a reference trace must be taken For transmission measurements this reference trace is referred to as a thru because the reference trace is measured with the DUT removed from the system For reflection measurements an open short average is used Because you are making a transmission measurement a thru reference trace must be stored To store the thru trace 13 Press AUX CTRL TRACKING GENRATOR SOURCE CAL MENU CAL THRU 14 The guided calibration routine illustrated in Figure 3 14 prompts you to connect the thru Remove the DUT replacing it with a barrel connector for optimum measurement integrity and connect the thru as shown in Figure 3 15 ATTEN 10dB RL OOE TOOR Connect THRU Store when ready START 4 0MHZ STOP 4 0000GHZz SABW 300Hz vBw 300Hz SWP 1 78e0 Figure 3 14 Guided Calibration Prompt HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 15 2 HEURE n nere stare m LA oo oo COC CO meem OOO CI IO O C3 COO CI Tol OOOLL vane SS au aim Ter on OOOLL 0 49 9 e QUE aco Uj loo U trac
93. ce position or the position where 0 dB insertion loss transmission measurements or O dB return loss reflection measurements normally resides When normalization is ON trace math is being performed on the active trace A B NRP A where A is the active trace B is the stored thru reference trace NRP is the normalized reference position When normalization is on an H appears in the special function section of the display screen Notice that the reference level reading changes to dB to reflect this relative measurement see Figure 3 17 HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 17 Note After a reference trace is saved changing the settings of the spectrum analyzer then activating normalization will cause an ERE Error messages are displayed in the lower right hand corner of the spectrum analyzer s display To clear the error and obtain a valid measurement either reset the analyzer to the same settings as the reference trace or save a new reference trace ATTEN 10dB AL OdB8 TOOR START 2 0MHz STOP 4 0000GHZz SABW 300Hz vBw 300Hz SWP 4 7sec Figure 3 17 Normalized Trace Measure 17 Measure the rejection range using the spectrum analyzer s delta markers Press MARKER DELTA and adjust the vernier knob on the front panel of the spectrum analyzer to position the second marker in the rejection area of the bandpass
94. chassis Lift the power supply assembly out of the instrument Replacement 10 11 12 13 14 15 16 Replace the A4 power supply in the chassis and lightly tighten three of the four screws Replace the grounding wire with the forth screw Alternately tighten all four screws to 7 inch pounds Resolder the two wires from A4W2 to the ALC switch D The wires should be connected between the closed contacts when the ALC switch is set to INT Connect A4W1 to A5W1 4 Replace the cable ties 8 with A4W2 included Replace the power supply cover loosely tighten the four side screws and the three chassis screws Alternately tighten all screws to six inch pounds Replace the cables into the cable clips 7 14 Service Information HP 85640A RF Tracking Generator Operation and Service Manual A 3 PLACES 3 PLACES 8 2 PLACES 5 1 4 PLACES 4 PLACES 7 6 2 PLACES 3 PLACES wk245 Figure 7 6 A4 Power Supply Replacement HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 15 A5 Line Filter Switch Assembly Replacement Caution The tracking generator assemblies are static sensitive Perform assembly procedures at static safe work stations Refer to Figure 7 1 for an example of a static safe work station Removal Remove the instrument cover as described on page 7 7 Remove the
95. cord any 1st LO frequency setting s at which the power level is out of tolerance b Determine the equivalent center frequency setting for any 1st LO frequency at which the amplitude is out of tolerance by subtracting 3 9107 GHz from the 1st LO frequency c If the equivalent center frequency setting for any out of tolerance 1st LO amplitude measured at A2J3 is close to the CENTER FREQ setting s that caused an unleveled condition suspect either A2 or W8 6 If the output is unleveled only at certain power level settings or certain frequencies monitor ASU5 pin 1 with a digital voltmeter DVM a Connect the negative DVM lead to the negative end of A3C27 b Vary the tracking generator OUTPUT LEVEL vernier or host spectrum analyzer CENTER FREQ settings as appropriate and plot the voltage variation versus power level or frequency A discontinuity in the plot near the power level causing the unleveled condition indicates a problem on the A3 interface assembly A discontinuity in the plot near the frequency which caused the unleveled condition may indicate a problem on A3 in the power level control function block or on the 0 5 V GHz signal from the host spectrum analyzer d Check the 0 5 V GHz signal Monitor the 0 5 V GHz signal voltage with a DVM e Vary the spectrum analyzer frequency and plot the voltage variation versus frequency If a discontinuity exists near the frequency causing the unleveled condition examine the hos
96. ctor door See Figure 2 1 Power Cable The HP 85640A is equipped with a three wire power cable in accordance with international safety standards When connected to an appropriate power source outlet this cable grounds the instrument cabinet Warning Failure to ground the instrument properly can result in personal injury Before turning on the tracking generator you must connect its protective earth terminals to the protective conductor of the main power cable Insert the main power cable plug only into a socket outlet that has a protective earth contact Do not defeat the earth grounding protection by using an extension cable power cable or auto transformer without a protective ground conductor If you are using an auto transformer make sure its common terminal is connected to the protective earth contact of the power source socket Various power cables are available for the power outlets unique to specific geographic areas The appropriate cable is included with the instrument when it is shipped to an area requiring one of these cables You can order additional ac power cables listed in Figure 2 2 for use in different areas Figure 2 2 also illustrates the plug configurations and identifies the geographic area in which each cable is appropriate HP 85640A RF Tracking Generator Operation and Service Manual Installation 2 5 CABLE PLUG CABLE CABLE FOR USE PLUG TYPE HP PART DESCRIPTION LENGTH COLOR IN COUNTRY NUMBE
97. dg AL 20 0dB 10087 539 5MHz NOR PEZ LL 20 o d START 2 0MHz STOP 4 0000GHZz SABW 300Hz vBw 300Hz SWP 4 7sec Figure 3 19 NORM REF LVL Adjusts the Trace and Retains Analyzer Settings ATTEN 1008 AMKR 103 5d8 BL 20 0dB 40de 535 5MHZ DYNAMIC RANGE AL s6 o dem START 2 0MHz STOP 1 00006H2Z SABW 300Hz vBw 300Hz SWP 4 7sec Figure 3 20 RANGE LVL Increases Dynamic Measurement Range HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 19 Note If the actual signal measurement is beyond the gain compression limit or below the bottom graticule of the display an error message appears in the lower right hand corner of the display In the case shown in Figure 3 20 the passband information has been adjusted off screen in order to view the rejection range with better resolution Changing the analyzer settings to raise the pass band information above the top of the screen causes an 3 20 Operation HP 85640A RF Tracking Generator Operation and Service Manual Making a Transmission Measurement Using an HP 8561A or HP 8562A B Spectrum Analyzer Note Instructions for making transmission measurements using an HP 8560A E HP 8561B E or HP 8563A E begin on page 3 9 The examples in this section were made using an HP 8562B spectrum analyzer
98. e Perform this adjustment procedure at a static safe workstation Refer to Figure 7 1 for an example of a static safe workstation DIGITAL VOLTMETER ADAPTER d ZZ AROC OQ S o562556060sso CX V r e TEST LEADS BNC CABLE HOST BNC CABLE SPECTRUM ANALYZER HP 85640A LO SWP TRACKING GENERATOR BLANK ING 0 5V GHz SHOWN IN SERVICE POSITION 0 5V GHz BLANK I NG oo a a 50909 gg 000 5 INPUT INPUT 9990 Y O So5c0 C3 soooo o O oocooao E OOO 6 Qos 8 300 LO 1ST LO CAL MHz INPUT OUTPUT OUTPUT INPUT SMA CABLE wk229 BNC CABLE Figure 5 1 Power Supply Adjustments and Checks Setup 5 4 Adjustment Procedures HP 85640A RF Tracking Generator Operation and Service Manual 1 Power Supply Adjustments and Checks TP6 TP7 A4 POWER SUPPLY UNDER SHIELD 0 0 EOD Ops MEET i 00 TN bz 0 0 il ta mm n m m ao ioa Cs O 04 o 0 A
99. e parallax when setting the knob view the pointer and the scale marking directly from the front of the instrument panel The ridges on the knob are also useful for properly aligning the pointer with the scale marking 10 11 Set the tracking generator OUTPUT LEVEL vernier precisely to 0 dBm Locate the groove on the vernier knob closest to the pointer on the knob Follow this groove down the knob to the front panel Align this groove with the front panel 0 mark Disconnect the type N cable from the tracking generator RF OUTPUT Terminate the RF OUTPUT using the 500 termination Set the host spectrum analyzer controls as follows START FREQ eesseeeR eee eee e nn 300 kHz STOP FREQ oo e IRI ene 2 9 GHz SWEEP TIME seseeen RII n 10 sec Check the UNLEVELED indicator function by temporarily disconnecting the BNC cable between the host spectrum analyzer CAL OUTPUT and the tracking generator 300 MHz INPUT connectors The UNLEVELED indicator should light when this cable is disconnected Reconnect the BNC cable Watch the UNLEVELED indicator as the host spectrum analyzer sweeps If the UNLEVELED indicator does not light during a sweep proceed to step 13 and enter 0 dBm as the maximum leveled output power in the space provided below If the UNLEVELED indicator does light anytime during a sweep reduce the OUTPUT LEVEL vernier setting by 1 dB Watch the UNLEVELED indicator as the host
100. e warmup for ambient conditions a one year calibration cycle all environmental requirements met tracking generator used with one of the compatible spectrum analyzers listed in Table 1 1 HP 85640 Specifications Characteristics provide useful but non warranted information in the form of typical nominal or approximate values for tracking generator performance See Table 1 2 for a list of tracking generator characteristics HP 85640A RF Tracking Generator Operation and Service Manual General Information 1 5 Table 1 1 HP 856404 Specifications Frequency Specifications Frequency Range 300 kHz to 2 9 GHz Minimum Resolution Bandwidth Supported HP 8561A HP 8562A B 100 Hz HP 8560A E HP 8561B E HP 8563A E 300 Hz 1 6 General Information HP 85640A RF Tracking Generator Operation and Service Manual Amplitude Specifications Output Level Range Vernier Attenuator Maximum leveled output power Resolution Attenuator Vernier Accuracy Level flatness referenced to 300 MHz vernier at O dB attenuator at 10 dB Output attenuator Switching Accuracy 10 dB to 70 dB settings referenced to O dB setting O dBm to 80 dBm gt 10 dB 70 dB gt 0 dBm 10 dB steps Continuously adjustable lt 2 0 dB lt 0 8 dB per 10 dB step to a maximum of 1 5 dB Spurious Outputs Unless otherwise specified with vernier set to O dBm and attenuator set to 10 dB 10 dBm output power
101. eled 15V See Figure 5 2 7 Locate 15V ADJ see Figure 5 1 Adjust 15 V ADJ for a DVM reading of 15 V 0 05 V 8 Connect the positive test lead from the DVM to the positive end of A3C2 the end labeled 10 11 c 5V See Figure 5 1 Check that the DVM reads 5 V 0 2 V Connect the positive test lead from the DVM to ASTP6 Check that the DVM reads 10 000 V 0 030 V Connect the positive test lead from the DVM to A3TP7 Check that the DVM reads 10 000 V 0 030 V Remove the DVM test leads 5 6 Adjustment Procedures HP 85640A RF Tracking Generator Operation and Service Manual 2 600 MHz Level Adjustment 2 600 MHz Level Adjustment Assembly Adjusted A3 interface assembly Related Performance Test There is no related performance test for this adjustment Description The ASU4 attenuator pad value is selected to adjust the 600 MHz drive signal power level at A3J5 to 8 dBm 1 dB The host spectrum analyzer s CAL OUTPUT amplitude is checked first The level of undesired harmonics at A3J5 are also checked Caution The tracking generator assemblies are static sensitive Perform this adjustment procedure at a static safe workstation Refer to Figure 7 1 for an example of a static safe workstation 122cm BNC CABLE ADAPTER HP 85640A TRACKING GENERATOR SHOWN IN SERVICE POSITION ASJS OOO ZH 500MHz INPUT LO INPUT
102. enerator OUTPUT LEVEL vernier knob to 0 dBm HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 29 7 Tracking Generator Feedthrough 10 11 12 13 14 15 Set the host spectrum analyzer controls as follows CENTER FREQ ec cc cence are 300 kHz SPAN 0 e he e e e e e he 0 Hz REF LVL eeee RR Hh e 50 dBm Markers eeeeeeeeee ee RR e e e OFF RES BW 20 ee e e es 300 Hz VIDEO BW ccc RH e e e e eh 1 Hz On the host spectrum analyzer press SINGLE and wait for the sweep to finish If the host spectrum analyzer is an HP 8561A HP 85624 or HP 8562B press MARKER ON Press MKR on an HP 8560A E HP 8561B E or HP 8563A E Record the marker amplitude reading in Table 4 8 for the 300 KHz tracking generator output frequency Repeat step 12 for the remaining tracking generator output frequencies listed in Table 4 8 In Table 4 8 locate the most positive noise level amplitude for the 300 kHz to 1 MHz frequency range Record this amplitude value here Tracking generator feedthrough 300 kHz to 1 MHz dBm In Table 4 8 locate the most positive noise level amplitude for the 1 MHz to 2 0 GHz frequency range Record this amplitude value here Tracking generator feedthrough 1 MHz to 2 0GHz dBm In Table 4 8 locate the most positive noise level amplitude for the 2 0 GHz to 2 9 GHz frequency range Record this amplitude value here Tracking generator feedthrough 2 0
103. enue Cupertino CA 95014 USA 800 752 0900 Colorado Hewlett Packard Co 24 Inverness Place East Englewood CO 80112 303 649 5000 New Jersey 120 W Century Road Paramus NJ 07653 201 599 5000 California Northern Hewlett Packard Co 301 E Evelyn Mountain View CA 94041 415 694 2000 Georgia Hewlett Packard Co 2000 South Park Place Atlanta GA 30339 404 955 1500 Texas 930 E Campbell Rd Richardson TX 75081 214 231 6101 California Southern Hewlett Packard Co 1421 South Manhattan Ave Fullerton CA 92631 714 999 6700 Illinois Hewlett Packard Co 5201 Tollview Drive Rolling Meadows IL 60008 708 255 9800 EUROPEAN FIELD OPERATIONS Headquarters Hewlett Packard S A 150 Route du Nant d Avril 1217 Meyrin 2 Geneva Switzerland 41 22 780 8111 Great Britain Hewlett Packard Ltd Eskdale Road Winnersh Triangle Wokingham Berkshire RF11 5DZ England 44 734 696622 France Hewlett Packard France 1 Avenue Du Canada Germany Hewlett Packard GmbH Berner Strasse 117 Zone D Activite De Courtaboeuf 6000 Frankfurt 56 F 91947 Les Ulis Cedex France 33 1 69 82 60 60 West Germany 49 69 500006 0 INTERCON FIELD OPERATIONS Headquarters Hewlett Packard Company 3495 Deer Creek Rd Palo Alto California 94304 1316 415 857 5027 China China Hewlett Packard Co 38 Bei San Huan X1 Road Shuang Yu Shu Hai Dian District Beijing China 86 1 256 68
104. er 5 Set the tracking generator OUTPUT LEVEL vernier to O dBm Do not readjust the OUTPUT LEVEL vernier control for the remainder of this test 6 Connect the type N cable to the tracking generator RF OUTPUT and the measuring receiver INPUT 500 connectors 7 On the measuring receiver press the blue shift key AUTOMATIC OPERATION INSTR PRESET FREQ MHz INPUT FREQ gold shift key RF POWER TUNED RF LEVEL 4 4 SPCL 32 0 SPCL blue shift key ZERO SET REF LOG LIN The display should read 0 00 dB 0 01 dB 8 Set the tracking generator OUTPUT LEVEL attenuator control to each of the settings listed in Table 4 3 If RECAL is displayed on the measuring receiver press CALIBRATE At each attenuator setting subtract the attenuator setting always negative from the measuring receiver reading and record the result as the cumulative attenuator accuracy CAA in Table 4 3 CAA measuring receiver reading attenuator setting 9 Calculate the step to step attenuator accuracy for each setting other than 0 dB by subtracting the previous CAA from the current CAA Record the result in Table 4 3 as the step to step attenuator accuracy SSAA for the current attenuator setting SSAA current CAA previous CAA HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 7 1 Output Attenuator Accuracy Table 4 3 Output Attenuator Accuracy Output Level Attenuator Accuracy Measureme
105. erator as the swept source and the spectrum analyzer as the receiver operation is analogous to a single channel scalar network analyzer It can be used to characterize a device under test DUT in terms of transmission or reflection parameters Transmission measurements include ripple flatness and rejection Return loss is a typical reflection measurement Because it is a narrowband system the tracking generator s output frequency tracks the spectrum analyzer s input frequency resulting in a wide dynamic range This wide dynamic range is illustrated in the following simplified block diagram SPECTRUM ANALYZER fs Fr E c I I AMP FILTER XN I pr to CO SCAN K mr I TRACKING GENERATOR wk213 Figure 3 5 Host Spectrum Analyzer and Tracking Generator System Block Diagram Making a Stimulus Response Measurement There are four basic steps to perform when doing stimulus response measurements whether transmission or reflection measurements Set up the spectrum analyzer settings Calibrate Normalize R R R m Measure HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 7 Equipment Needed The DUT used in the transmission and reflection measurements shown in this chapter is a bandpass filter with a 321 4 MHz center frequency and a specified rejection of 80 dB For the test setups in Figure 3 8
106. es are too high the broadband ALC detector may be causing ALC loop oscillations generating FM sidebands c If any spurious responses are excessively high refer to Harmonic Spurious Outputs Too High later in this section 4 If no spurious responses are present or are sufficiently low in amplitude to not cause a problem suspect A2 7 26 Service Information HP 85640A RF Tracking Generator Operation and Service Manual Flatness Out of Tolerance The output level flatness of the tracking generator is specified at a 10 dBm output power setting vernier set to 0 dBm attenuator set to 10 dB In general most flatness problems result from a failure in the A2 tracking generator microcircuit However the POWER LVL signal from the A3 interface assembly and the LO INPUT signal from the host spectrum analyzer can also contribute to flatness problems 1 Check the function of the POWER LVL signal from the A3 interface assembly a b C d Set the tracking generator s OUTPUT LEVEL vernier to a level at which the flatness is out of tolerance Monitor A3UBA pin 1 with a DVM while stepping the CENTER FREQ from 100 MHz to 2 9 GHz in 100 MHz increments Plot the voltage variation versus frequency A discontinuity in the plot near the frequency at which the flatness is out of tolerance indicates a problem on the host spectrum analyzer s 0 5 V GHz OUTPUT 2 Check the flatness of the LO INPUT signal a b Perform the
107. for 0 dBm maximum leveled output power The spectrum analyzer s INPUT 509 is also terminated in 509 The displayed average noise level of the spectrum analyzer is measured and recorded at several frequencies BNC CABLE HOST SPECTRUM HP 85640A BNC CABLE ANALYZER TRACKING GENERATOR Lo swel BLANK ING 0 5V GHz 0 5V GHz BLANK ING INPUT INPUT RE O Ssssa OUTPUT O oorno Co aam 300 w M nun on Q 000 z 8 g PUT WOW OT RW DU 255 a to INPUT QUTPUT INPUT 509 SMA CABLE CAL BNC CABLE OUTPUT o 13 BNC 502 TERMINATION CABLE AT ADAPTER L TYPE N CABLE 500 TERMINATION wk227 Figure 4 8 Tracking Generator Feedthrough Test Setup 4 28 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 7 Tracking Generator Feedthrough Equipment Host spectrum analyzer HP 8560A E 8561A B E HP 8562A B or HP 8568A E 500 termination 2 required RRH HP 908A Cables Type N 62 em 24 in 2 required seesseseeeee eh HP 11500B C BNC 62 cm 24 in 3 required 6 0 ete ent e nen 8120 1839 SMA 52 cm 20 in 2 nre 5061 9038 BNC 28 em 8 in 2 ec ran HP 10502A Adapters Type N m to BNC TP 1250 1476 Procedure 1 Connect the equipment as shown in Figure 4 8 Use the type N cable to connect the tracking generator s RF OUTPUT to the host spectrum analyzer s INPUT 500
108. four screws two per side from the power supply shield Remove the three screws Q connecting the power supply shield to the chassis Remove the shield Depress the clips on the sides of A5W1 P1 connector 3 to disconnect A5W1 from AAWI 5 Remove the line module grounding nut 2 to disconnect A5W3 To remove the front panel line switch remove the screw 6 securing the grounding wire to the frame 7 Pull the line switch away from the front frame and slip the LED out of its socket Remove the two screws 5 that connect the line module to the chassis 9 Carefully pull ABW2 7 out of the harness clips 8 and remove the A5 assembly Replacement 10 11 12 13 14 15 16 Replace the line module into the chassis with the plug prongs toward the top of the tracking generator and the voltage selection switch toward the bottom Alternately tighten the two screws Reconnect A5W3 grounding wire with the nut 2 and tighten it to six inch pounds Lay A5W2 7 along its path near the harness clips 9 and slip the LED into its slot on the line switch Orient the line switch so that LINE reads correctly from the outside Tighten the grounding screw 6 to six inch pounds Press A5W2 into the harness clips Reconnect A5W1 to A4W1 Replace the power supply cover loosely tighten the four side screws and the three chassis screws Alternately tighten all screws to six inch pounds
109. he marker Press PEAK SEARCH ON MARKER DELTA then use the analyzer s adjustment knob to position the marker at the frequency of interest typically the point of maximum return loss See Figure 3 45 ATTEN 1008 AMKR 2e7 83dB8 BL OdBm 100BY 263 3MHz Lo AMEKB 28 M 28 00 dB i M START 300kHz STOP 1 00006Hz ABW 2 0MHz VBW 3 0MHz SWP Soms Figure 3 45 Return Loss Reading Using the Function Operation HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests What You ll Find in This Chapter This chapter contains performance test procedures that verify the electrical performance of the HP 85640A RF tracking generator against the specifications in Table 1 1 None of the test procedures requires removing the instrument cover To test the tracking generator you must connect it to a powered on Hewlett Packard spectrum analyzer Any one of the following may serve as the host spectrum analyzer m HP 8560A E spectrum analyzer non Option 002 m HP 8561A B E spectrum analyzer m HP 8562A B spectrum analyzer m HP 8563A E spectrum analyzer What is Performance Verification The highest level testing called performance verification tests the tracking generator s performance against all its specifications listed in Table 1 1 Table 4 1 lists all performance verification tests and test equipment required
110. ic Spurious Outputs l l en 4 19 6 LO Feedthrough Amplitude 2 2 2 2 2 2 4 25 7 Tracking Generator Feedthrough l l ll 4 28 8 Frequency Tracking Range 2 2 2 2 2 2 2 2 5 5 4 32 5 Adjustment Procedures What You ll Find in This Chapter 4 llle 5 1 Safety Considerations 4 ee 5 1 Which Adjustment Should Be Performed 5 1 Test Equipment 4 4 4 e 4 44e s 5 1 Adjustable and Factory Selected Components 5 2 Adjustment Tools 4 4 4 s 5 2 1 Power Supply Adjustments and Checks csl n s 5 4 2 600 MHz Level Adjustment 2 2 2 2 2 25 225 2 5 7 3 Power Level Adjustments 2 2 2 2 2 2 2 25 25 2 2 2 5 12 4 Tracking Oscillator Range Adjustments llle 5 15 Fine Adjustment ll A 5 17 Coarse Adjustment 2 2l ll ll 4 4h 5 17 HP 85640A RF Tracking Generator Operation and Service Manual 6 Assembly Replaceable Parts What You ll Find in This Chapter oaoa a a a 6 1 Major Assembly and Cable Locations llle en 6 2 Mechanical Replaceable Parts l l 6 4 7 Service Information What You ll Find in This Chapter 2 0 0 2 2 0 0 22 00 00842 7 1 Electrostatic Discharge ee 7 2 PC Board Assemblies and Electronic Components 7 2 Returning the RF Tracki
111. imit ATTEN 10dB AMKR 9141 33dg AL 30 0cdBgm Jods 5 BMH MEAS UNCALL REF LVL 30 0 dim M y l liy OU n START 1 OMHZ STOP 1 0000GFHz BBW 300Hz vBW 300Hz SwWP 1 75ec Figure 3 32 Increased Dynamic Measurement Range HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 29 Reflection Measurements Making a Reflection Measurement Using an HP 8560A E HP 8561B E or HP 8563A E Spectrum Analyzer Note Instructions for making reflection measurements using an HP 8561A or HP 8562A B begin on page 3 37 The examples in this section were made using an HP 8560A spectrum analyzer but are similar to results you may expect with an HP 8560E HP 8561B E or HP 8563A E Set up the System To measure the return loss of a bandpass filter 1 Make the necessary connections between the spectrum analyzer and the tracking generator see Figure 3 3 2 Select the 0 5 V GHz OUTPUT on the spectrum analyzer by pressing SWEEP REAR PNL OUTPUT 5V GHZ FAV E On an HP 8560E HP 8561E or HP 8563E press swEEP GATE OFF 9 Examine the tracking generator s output power by connecting its RF OUTPUT directly to the spectrum analyzer s INPUT 509 4 On the spectrum analyzer Press PRESET FREQUENCY START FREQ 300 kHz STOP FREQ 2 9 GHz Calibrate 5 Connect the DUT as shown in Figure
112. in Table 4 5 and record the value below 3rd harmonic level dBe Table 4 5 Harmonic Spurious Outputs Tracking Generator 2nd Harmonic 3rd Harmonic Measurement Frequency Level dBc Level dBc Uncertainty dB 300 kHz 1 55 1 80 100 MHz 1 55 1 80 300 MHz 1 55 1 80 900 MHz 1 55 1 80 1 4 GHz N A 3 45 4 01 4 18 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 5 Non Harmonic Spurious Outputs 5 Non Harmonic Spurious Outputs Specification Non harmonic spurious 300 kHz to 2 0 GHz lt 27 dBc outputs 2 0 GHz to 2 9 GHz 23 dBe Related Adjustment There is no related adjustment for this performance test Description The tracking generator s RF OUTPUT is connected to the host spectrum analyzer s INPUT 509 Tracking is adjusted at 300 MHz for a maximum signal level The tracking generator s RF OUTPUT is then connected to the input of an HP 8566A B spectrum analyzer The tracking generator is set to various output frequencies At each output frequency several sweeps are taken with an HP 8566A B at different span settings The highest displayed spurious output is measured in each span Responses at the fundamental frequency of the tracking generator output or their harmonics are ignored The amplitude of the highest spurious response is recorded HP 85640A RF Tracking Generator Operation and Service Manual Perform
113. ine wk253 12 Store the thru trace in trace B by pressing TRACE B CLR WRT B Wait for the new speed to finish then VIEW B 13 For future reference store the thru trace in a trace register Press SAVE TRACE B TRACE n where n is the number of the trace register 3 26 Operation HP 85640A RF Tracking Generator Operation and Service Manual Note If SAVE LOCK is on pressing TRACE n on an HP 8561A 62A causes the message to appear in the active function area If this happens press SAVE SAVELOCK OFF SAVE TRACE B TRACE n Figure 3 29 shows the on screen condition after a thru trace is stored In the illustration the DUT is reconnected and trace B is in view displaying the thru trace ATTEN 10dB RL OcdB amp Bm TOOR MEAS NO ALL SAVE TRACE B O START 2 0MHz STOP 4 0000GHZz SABW 300Hz vBw 300Hz 9SwP 1 7 5sec Figure 3 29 Display of Thru Reference Trace in Trace B Normalize 14 To normalize activate the trace math function A B DL A by pressing MORE Press B DL A ON OFF to select ON Note When trace math is on an ii will appear in the special functions section of the display 15 If necessary make adjustments to the position of the trace by changing the position of the display line Access the display line by pressing DISPLAY DSPL LIN ON OFF The preset value of the disp
114. ipment Complete Figure 1 1 shows the parts and accessories that are shipped with your HP 85640A RF tracking generator If any part or accessory is missing contact your sales representative Is the Shipping Container in Good Condition Inspect the shipping container If the container or cushioning material is damaged verify that the contents are complete and that the analyzer functions correctly both mechanically and electrically If the contents are incomplete or if the HP 856404 fails the verification tests in Chapter 4 notify any Hewlett Packard sales and service office see Table 2 3 The HP sales and service office will arrange for repair or replacement without waiting for a claim settlement Save all packaging materials show any damages to the container or cushioning materials to the carrier Save the Packaging Materials The shipping container and cushioning materials are shown in Figure 7 2 Save these materials to use when you ship your instrument or return it for service or repair If the original materials are not available you may order replacements from any HP sales and service office see Table 2 3 Instructions for repackaging the HP 85640A are in Returning the RF Tracking Generator for Service in Chapter 7 Preparing the RF Tracking Generator for Use The RF tracking generator must be properly connected to one of the compatible portable spectrum analyzers listed in Table 2 1 You also need to connect it t
115. ipping container FRAGILE HANDLE WITH CARE to ensure careful handling 7 Keep copies of all shipping papers 7 4 Service Information HP 85640A RF Tracking Generator Operation and Service Manual wk28 Figure 7 2 HP 85640A Shipping Container and Cushioning Materials Item HP Part Number Description 1 Outer carton 9211 6065 2 Front foam pad 9220 4620 3 Bottom tray 9220 4621 4 Rear foam pad 9220 4622 5 Anti static vinyl bag 85901 80002 large HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 5 Replacement Procedures Al attenuator replacement A2 tracking generator assembly replacement A3 interface board assembly replacement A4 Power supply replacement A5 FLI line filter switch assembly replacement Rebuilt Exchange Assemblies Table 6 1 lists part numbers for rebuilt exchange assemblies Exchange assemblies factory repaired and tested are available only on a trade in basis therefore the defective assembly must be returned for credit To return a defective exchange assembly 1 Record the nature of the assembly s defect 2 Wrap the defective assembly in its static safe wrapping and replace it in the original shipping container Enclose a copy of the recorded defect information 3 Place the pre addressed label on the package and return the defective assembly to receive credit 7 6 Service Information HP 85640A RF Tracking Generator Operation and Service Manual
116. itive Perform assembly procedures at static safe work stations Refer to Figure 7 1 for an example of a static safe work station Removal 1 2 Remove the instrument cover as described on page 7 7 Refer to Figure 7 5 to disconnect the following seven cable assemblies from the A3 interface board assembly D W1 from A3J2 W2 from A3J1 A4W2 from A3J3 W4 from A3J4 5 W5 from A3J5 6 W6 from A3J6 D WT from A3J3 3 Remove the five screws 8 washers are attached to the screws from the A3 board assembly Loosen the board assembly from the hook and loop fastener then lift the board assembly from the instrument Replacement 5 If you are replacing the bottom shield or installing a new board assembly attach either the hook or loop side to the bottom shield so it aligns with the fastener remaining on the chassis Replace the top and bottom shields to the A3 board assembly then tighten the six screws 9 7 Align the A3 board assembly in the chassis The hook and loop fasteners hold the board in position temporarily Secure the board assembly with the five screws 8 and washers tightened to six inch pounds Reconnect the following seven cable assemblies to the A3 interface board assembly D W1 to A3J2 Q W2 to A3J1 O AAW2 to A3J3 O W4 to A3J4 W5 to A3J5 W6 to A3J6 D W7 to A3J3 7 12 Service Information HP 85640A RF Tracking Generator Operation and Service Manual
117. kinc uer OUTPUT LEVEL dem UNLEVELED N o A Yu 2 10 70 o o 2 e0 E fso o 0 il LH C TT m Figure 3 15 Thru Connected for Guided Calibration Routines 3 16 Operation HP 85640A RF Tracking Generator Operation and Service Manual 15 Press STORE THRU when ready The thru trace is stored in trace B It is also stored in an internal memory location in the analyzer The state information of the thru reference trace is stored in state register 79 This trace can be recalled for future use In Figure 3 16 the DUT is reconnected and trace B is in view showing the thru trace Note If SAVE LOCK is on pressing STORE THRU causes the message appear in the active function area If this happens press to a SAVE SAVE LOCK OFF b aux CTRL TRACKING GENERATOR SOURCE CAL MENU CAL THRU STORE THRU ATTEN 10dB RL OOE TOOR Lle START 2 0MHz STOP 4 0000GHZz SABW 300Hz vBw 300Hz SWP 1 78e0 Figure 3 16 Display of Thru Reference Trace in Trace B Normalize 16 To normalize press AUX CTRL TRACKING GENERATOR NORMLIZE ON OFF until ON is selected Notice that an arrow appears on each side of the graticule when normalization is activated These arrows mark the normalized referen
118. king generator s RF OUTPUT to the host spectrum analyzer s INPUT 509 2 Press PRESET on the host spectrum analyzer and set the controls as follows CENTER FREQ 2 0 eh rss 300 MHz DD a OA 0 Hz RES SA A 300 Hz 3 If the host spectrum analyzer is an HP 8561A HP 8562A or HP 8562B press SWEEP REAR PNL OUTPUT 5 V GHz FAV If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press AUX CTRL REAR PANEL 5 V GHz FAV 4 On the tracking generator set the OUTPUT LEVEL vernier knob to 5 dBm Set the OUTPUT LEVEL attenuator knob to 0 dB then adjust TRACKING ADJUST to display a maximum signal level on the host spectrum analyzer 5 On the tracking generator set the OUTPUT LEVEL vernier knob to 0 dBm and the OUTPUT LEVEL attenuator knob to 10 dB 6 On the host spectrum analyzer press TRIG SGL SWP Note You need to perform step 8 only if more than 2 hours have elapsed since a front panel calibration of the HP 8566A B has been performed The HP 8566A B should be allowed to warm up for at least 30 minutes before proceeding 7 Perform a front panel calibration of the HP 8566A B as follows a Connect a BNC cable between CAL OUTPUT and RF INPUT b Press 2 22 GHz INSTR PRESET RECALL 8 Adjust AMPTD CAL for a marker amplitude reading of 10 dBm c Press RECALL 9 Adjust FREQ ZERO for a maximum amplitude response d Press SHIFT FREQUENCY SPAN to start the 30 second internal
119. lay line is 0 dBm HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 27 16 Reconnect the DUT Figure 3 30 shows the normalized trace ATTEN 10dB RL OOE TOOR MEAS TTT START 2 0MHz STOP 4 0000GHZz SABW 300Hz vBw 300Hz 9SwP 1 7 5sec Figure 3 30 Normalized Trace Measure 17 Measure the rejection range using the spectrum analyzer s delta markers Press MARKER DELTA and adjust the vernier knob on the front panel of the spectrum analyzer to position the second marker in the rejection area of the bandpass filter See Figure 3 31 ATTEN 10dB AMKR 81 570B RL OOE TOOR 522 8MHZ MEAS TTT Lall START 2 0MHz STOP 4 0000GHZz SABW 300Hz vBw 300Hz 9SwP 1 7 5sec Figure 3 31 Measuring Rejection Range with Delta Markers 3 28 Operation HP 85640A RF Tracking Generator Operation and Service Manual 18 REF LVL increases the dynamic range of the measurement by changing the input attenuator and IF gain It makes sure the input signal is not in gain compression To increase the dynamic range of the measurement press REF LVL J Note that while increasing the dynamic range more errors are introduced into the measurement Figure 3 32 shows the results of increasing the dynamic range Notice that the top of the screen does not necessarily represent the gain compression l
120. levels that cause the unleveled condition Note Itis acceptable for the output to be unleveled at power levels greater than the specified maximum leveled output power level 3 Check the maximum power available from the tracking generator Connect the tracking generator s RF OUTPUT to the host spectrum analyzer s INPUT 509 o v Set the host spectrum analyzer to sweep from 300 kHz to 2 9 GHz c Set the reference level to 10 dBm and the log scale to 5 dB Div a Set the ALC switch on the tracking generator s rear panel to EXT Make no connection to the rear panel EXT ALC INPUT e The available power should always be greater than 1 dBm If the output is only unleveled at specific frequencies a power hole is usually visible at those frequencies 7 24 Service Information HP 85640A RF Tracking Generator Operation and Service Manual 4 Refer to the host spectrum analyzer s installation and verification manual and perform the 1ST LO OUTPUT amplitude performance test for the host spectrum analyzer Examine the host spectrum analyzer if it fails this test Note The HP 8560A E Option 002 spectrum analyzer does not provide sufficient LO drive for the HP 85640A RF tracking generator 5 If the spectrum analyzer passes the 1st LO output amplitude test repeat the test but measure the output power at A2J3 remove ATI on the tracking generator The power level at this point should be 14 5 dBm 3 dB a Note and re
121. ls on the tracking generator output if the 1st LO moves 1 MHz the tracking generator output will move 1 MHz There is a five to one relationship between the 600 MHz drive spurious outputs and tracking generator output spurious signals because of the pentupler multiplication For example if the 600 MHz signal moves 1 MHz the tracking generator output signal moves 5 MHz If the harmonic spurious outputs performance test has failed 1 If the harmonic spurious outputs performance test has failed disconnect the tracking generator and connect a spectrum analyzer such as an HP 8566A B to the host spectrum analyzer s IST LO OUTPUT 2 Set the host spectrum analyzer frequency as indicated in the performance test with SPAN set to O Hz 3 At each frequency setting press TRIG SINGLE 4 If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press MORE 1 OF 2 FREQ DIAGNOSE LO FREQ If the host spectrum analyzer is an HP 8561A HP 8562A or HP 8562B press MORE FREQ DIAGNOSE LO FREQ 5 The frequency displayed is the IST LO OUTPUT fundamental frequency Use the HP 8566A B to measure the 1st LO signal s second and third harmonics levels Note The 1st LO typically has a higher harmonic content than does the tracking generator output For this check the variation in harmonic content versus frequency is the factor of interest 6 If the 1st LO harmonic level variation versus frequency tracks the tracking generato
122. lyzer such as an HP 8566A B in place of a frequency counter c Try to adjust A2C3 until a signal is displayed on the HP 8566A B d If the tracking oscillator does not start by adjusting A2C3 suspect A2 7 30 Service Information HP 85640A RF Tracking Generator Operation and Service Manual Index 0 0 5V GHz input 3 4 0 5V GHz output 3 6 3 300 MHz input 3 2 A adjustment procedures 600 MHz level adjustment 5 7 adjustable components 5 3 adjustment list table 5 2 adjustment tools 5 2 factory selected components 5 3 post repair spec fail adjustment list 5 2 power level adjustment 5 12 power supply adjustment 5 3 safety considerations 5 1 tracking oscillator range adjustment 5 15 which adjustment to perform 5 1 alc int ext 3 4 assembly replaceable parts 6 1 6 introduction 6 1 major assembly and cable locations 6 2 mechanical replaceable parts 6 4 B bandpass filter rejection 3 21 blanking input 3 4 block diagrams 7 18 7 20 C calibration equipment needed 3 7 characteristics 1 11 12 connections tracking generator spectrum analyzer 3 5 E electrostatic discharge 7 2 error messages ERR 902 BAD NORM 3 18 ERR 903 A DLMT 3 20 SAVELOCK ON 3 17 3 27 3 35 3 40 ext alc input 3 4 HP 85640A RF Tracking Generator Operation and Service Manual F flatness out of tolerance 7 27 frequency tracking range performance test 4 31 front panel features 3 2 front panel interconnecti
123. monic Spurious Outputs Test Setup l l rcr 4 20 4 7 LO Feedthrough Test Setup l l 4 25 4 8 Tracking Generator Feedthrough Test Setup ccr 4 28 4 9 Frequency Tracking Range Test Setup 2 l l len 4 32 5 1 Power Supply Adjustments and Checks Setup s l rcr 5 4 5 2 Power Supply Adjustments and Test Point Locations 5 b 5 3 600 MHz Level Adjustment Setup llle 5 7 5 4 Attenuator ASU4 Location 2 ee 5 8 5 5 Power Level Adjustment Setup llle 5 12 5 6 Power Level Adjustment and Test Point Locations 022 5 13 5 7 Tracking Oscillator Range Adjustment l l ll n 5 15 5 8 Tracking Oscillator Range Adjustment Locations c l r s 5 16 6 1 Major Assemblies and Cable Locations l l 2 2 48 6 8 6 2 Mechanical Replaceable Parts 1 of 2 lll nn 6 4 6 3 Mechanical Replaceable Parts 2 of 2 l l ll len 6 6 7 1 A Static Safe Workstation 2 lll el ln 7 2 7 2 HP 85640A Shipping Container and Cushioning Materials 7 5 7 3 Al Attenuator Replacement 2 2 ee ee 7 9 7 4 A2 Tracking Generator Assembly Replacement 7 11 7 5 A3 Interface Board Assembly Replacement 1 18 7 6 A4 Power Supply Replacement 2 2 2 2 2 25 25 2 2 5 2 4 7 15 7 7 A5 FLI Line Filter Module Replacement
124. ms Figure 3 41 Return Loss Reading Using the Function 3 36 Operation HP 85640A RF Tracking Generator Operation and Service Manual Making a Reflection Measurement Using an HP 8561A or HP 8562A B Spectrum Analyzer Note Instructions for making reflection measurements using an HP 8560A E HP 8561B E or HP 8563A E begin on page 3 30 The examples in this section were made using an HP 8562B spectrum analyzer but are similar to results you may expect with an HP 8561A or HP 8562A Set up the System To measure the return loss of a bandpass filter 1 Make the necessary connections between the spectrum analyzer and the tracking generator see Figure 3 3 2 Examine the tracking generator s output power by connecting its RF OUTPUT directly to the spectrum analyzer s INPUT 500 On the spectrum analyze Press PRESET FREQUENCY START FREQ 300 kHz STOP FREQ 2 9 GHz 3 Select the 0 5 V GHz OUTPUT on the spectrum analyzer by pressing SWEEP REAR PNL OUTPUT 5V GHZ FAV Note HP 8561A and HP 8562A B spectrum analyzers do not have tracking generator related keys Sweep time settings during a stimulus response measurement are highly dependent on the device under test Any changes to resolution bandwidth span or other analyzer settings may cause a change in sweep time Setting Sweeptimes Accurate stimulus response measurements typically can use sweeptimes much faster than auto coupled sweeptimes The following procedure
125. n HP 85640A TRACKING GENERATOR LO SWP BLANK ING 0 5V GHz 0 5V GHz BLANK I NG Y INPUT INPUT RF o000 0 OUTPUT F O 55650 O poooo gt C asses x o 5 ooo jm z Z ooo rn INPUT o OW OY B DU 5050 a HT 1ST LO INPUT 509 SMA CABLE OUTPUT CAL BNC CABLE OUTPUT TYPE N CABLE POWER SENSOR A MEASURING RECEIVER O 0088 009990 20000 F o o E DO annpon O SENSOR wk225 Figure 4 4 Level Flatness Test Setup 4 12 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 3 Level Flatness Equipment Host spectrum analyzer HP 8560A E 8561A B E HP 8562A B or HP 8568A E Measuring receiver lees RH a HP 8902A Power sensor eseeeeeee eh rer ern HP 8482A Cables Type N 62em 24 in lseeseeeeeeeeee e hen HP 11500B C BNC 62 cm 24 in 3 required 6 0 ete ent e nen 8120 1839 SMA 52 cm 20 iN 0 ccc ee hh ren 5061 9038 Procedure 1 Connect the equipment as shown in Figure 4 4 Use the type N cable to connect the tracking generator s RF OUTPUT to the host spectrum analyzer s INPUT 500 2 Press PRESET on the host spectrum analyzer and set the controls as follows CENTER FREQ 20 tne ene ran 300 MHz CFE STEP cce nee rh aen 100 MHz SPAN eeuleeeseeee esee hahahaha 0 Hz RES BW oo seh ehh hr hen 300 Hz 3 If the host spectrum analyzer is an HP 8561A HP 8562A
126. n the TUNE line may cause residual FM on the tracking generator output HP 85640A RF Tracking Generator Operation and Service Manual A4 Power Supply The A4 power supply provides mains of 100 120 200 or 240 V 15 V de at up to 1 5 A The power supply operates from power ac at line frequencies between 47 and 66 Hz Refer to the interconnect diagram in this chapter for A4 to AAW1 and A4W2 connections A5 Line Filter Switch As sembly The A5 line filter switch assembly consists primarily of A5FLI the line filter module and A5W2S1 the instrument line sw itch A5FLI line filter module filters incoming ac power fuses the power line side of the ac power and sets the proper transformer taps on the A4 power supply for the required line volt instrument line switch switches age spare fuse is included in the line filter module The both the line and neutral sides of ac power HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 23 Troubleshooting Tracking Generator Related Faults This section will help you isolate tracking generator related faults to a specific assembly in the HP 85640A or in the host spectrum analyzer Output Unleveled The unlevel detector circuitry on the A3 interface assembly is used to monitor the control line ALC_ MON ALC monitor from A2 If ALC MON is greater than 1 091 V dc or less than 0 545 V dc the UNLEVELED LED on the front panel lights When li
127. ng Generator for Service 02422 7 4 Replacement Procedures 4 4 lll ll sn 7 6 Rebuilt Exchange Assemblies les 7 6 Removing and Replacing the Instrument Cover 7 7 Removal 7 7 Replacement A 7 7 Al Attenuator Replacement 2 2 2 2 25 25 2 25 2 5 2 5 7 8 Removal 2 ww 1 552 os 7 8 Replacement ee 7 8 A2 Tracking Generator Assembly Replacement 2422 7 10 Removal 2 ww 1 552 os 7 10 Replacement ee 1 10 A3 Interface Board Assembly Replacement 2 2 2 7 12 Removal 2 ww 1 552 os 1 12 Replacement 4 2 4 ll 4 4 4 44 4e s 7 12 A4 Power Supply Replacement 2 2 2 2 2 2 2 2 5 2 2 1 14 Removal 2 ww 1 552 os 7 14 Replacement ee 1 14 A5 Line Filter Switch Assembly Replacement 2 1 16 Removal 2 ww 1 552 os 1 16 Replacement 4 2 4 ll 4 4 4 44 4e s 1 16 HP 85640A RF Tracking Generator Circuit Descriptions and Troubleshooting Procedures 2 2 2 2 4 A 1 18 HP 85640A Block Diagram Circuit Descriptions 2 42 1 18 Troubleshooting the HP 85640A RF Tracking Generator Circuits 7 21 Al Attenuator 4 2 e A 7 21 A2 Tracking Generator 2 0 2 4 4 4 4 s 7 21 A3 Interface Assembly l4 lA 7 22 A4 Power Supply 2 2 we a 7 23 A5 Line Filter Switch Assembly
128. ng or installing any assembly or printed circuit board remove the instrument s line power cord Capacitors inside the instrument may still be charged even if the instrument has been disconnected from its source of supply Use a nonmetallic adjustment tool whenever possible Note Before beginning the adjustment procedures allow the instrument to warm up for at least five minutes see General Specifications in Table 1 1 Which Adjustment Should Be Performed Refer to Table 5 2 for the list of adjustment procedures you should perform after instrument repairs or after performance test results fail specification Test Equipment Refer to Table 4 1 Recommended Test Equipment for a list of equipment needed to perform these adjustment procedures Any equipment that satisfies the critical specifications provided in the table may be substituted for the preferred test equipment HP 85640A RF Tracking Generator Operation and Service Manual Adjustment Procedures 5 1 Adjustable and Factory Selected Components Refer to Table 5 3 for a list of the adjustable components organized by reference designator and name The table provides an adjustment description and lists the adjustment number for each component Refer to Table 5 4 for information about the factory selected component used in the tracking generator Factory selected components are identified with an asterisk on the schematic diagram Adjustment Tools For adjustments req
129. nob 3 2 P packaging 2 2 7 4 performance tests frequency tracking range 4 31 harmonic spurious outputs 4 16 host spectrum analyzers 4 1 level flatness 4 12 LO feedthrough amplitude 4 24 maximum leveled output power 4 9 non harmonic spurious outputs 4 19 output attenuator accuracy 4 6 preparing the host spectrum analyzer 4 3 preparing the tracking generator 4 3 recommended test equipment list 4 3 recording test results 4 3 test equipment required 4 3 test list table 4 1 tracking generator feedthrough 4 27 power requirements 2 3 6 line fuse 2 5 line voltage range 2 3 line voltage selection 2 4 power cables 2 5 Index 2 R rear panel features 3 4 rear panel interconnections 3 4 rear panel sweep output 4 3 reference trace 3 15 3 26 reflection measurement example HP 8560A E HP 8561B E HP 8563A E 3 30 HP 8561A HP 8562A B 3 37 savelock on error 3 35 3 40 store open short average reference 3 32 replacement procedures 7 6 17 A5 line filter switch assembly replacement 1 16 replacing A1 attenuator 7 8 replacing A2 tracking generator 7 10 replacing A3 interface board assembly 7 12 replacing A4 power supply 7 14 replacing the instrument cover 7 7 RF output 3 2 S sales and service 2 9 service information 2 9 Al attenuator circuit description 7 21 A2 tracking generator circuit description 7 21 A3 interface assembly circuit description 7 22 A4 power supply circuit descripti
130. not found record NOISE as the non harmonic response amplitude in Table 4 7 for the appropriate host spectrum analyzer CENTER FREQ and HP 8566A B START and STOP FREQ settings Repeat steps 17 through 22 for the remaining HP 8566A B settings for START FREQ STOP FREQ and RES BW for the host spectrum analyzer CENTER FREQ setting of 300 kHz Repeat steps 16 through 23 with the host spectrum analyzer CENTER FREQ set to 1 5 GHz Repeat steps 16 through 23 with the host spectrum analyzer CENTER FREQ set to 2 9 GHz Locate in Table 4 7 the most positive non harmonic response amplitude for HP 8566A B STOP FREQ settings of 2000 MHz Record this amplitude below Non harmonic response amplitude 2000 MHz dBe Locate in Table 4 7 the most positive non harmonic response amplitude for the HP 8566A B START FREQ settings 22000 MHz Record this amplitude below Non harmonic response amplitude 22000 MHz dBc Table 4 6 Fundamental Response Amplitudes Fundamental Frequency Fundamental Amplitude dBm 300 kHz 1 5 GHz 2 9 GHz HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 23 5 Non Harmonic Spurious Outputs Table 4 7 Non Harmonic Spurious Responses HP 8566A B Settings Non Harmonic Response Amplitude Measurement dBc Uncertainty Start Stop RES at 300 kHz at 1 5 GHz at 2 9 GHz Frequency Frequency BW CENTER FREQ CENTER FREQ CENTER FREQ in dB in MHz in MH
131. nput 85640 60008 2 W5 cable assembly 600 MHz input 85640 60007 1 W6 cable assembly blanking input 85640 60009 3 WT cable assembly 0 5V GHz input 85640 60010 6 W8 cable assembly LO input to TG 85640 20004 4 W9 cable assembly ATTEN to RF output 08560 20002 2 W10 cable assembly TG to ATTEN 08560 20003 3 Power supply cover 5002 0611 U 6 2 Assembly Replaceable Parts HP 85640A RF Tracking Generator Operation and Service Manual A4 T SS fm 2 OL oY AE A4W2 B amp e REAR FRAME wk237 A2 W8 ATI W9 ASW2S 1 P O A5 A1 RE E ASW2 dio 9 W5 f S L I Pp Wi IE w2 A3 LLL f Poof AAW2 Wi T 0 0 E 00 00 WT TT we t POWER SUPPLY COVER j wk2358 Figure 6 1 Major Assemblies and Cable Locations HP 85640A RF Tracking Generator Operation and Service Manual Assembly Replaceable Parts 6 3 Mechanical Replaceable Parts Table 6 1 Part Numbers for Figure 6 2 Item Description HP Part CD Number
132. ns and acceptable limits We recommend that you make a copy of this table record the complete test results on the copy and keep the copy for your calibration test record This record could prove invaluable in tracking gradual changes in test results over long periods of time HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 3 Table 4 2 Recommended Test Equipment Instrument Critical Specifications Recommended Use for Equipment Substitution Model Host spectrum Compatible with the tracking generator HP 8560A E P A T analyzer See Table 1 1 HP 8561A B E HP 8562A B HP 8563A E Microwave spectrum analyzer Microwave frequency counter Measuring receiver Power sensor Digital Voltmeter Power splitter Frequency range 300 kHz to 7 GHz Relative amplitude accuracy 300 kHz to 2 7 GHz lt 1 8 dB 300 kHz to 7 GHz lt 4 0 dB Absolute amplitude accuracy 3 9 GHz to 6 9 GHz lt 2 7 dB Frequency accuracy 10 kHz at 7 GHz Frequency range 1 MHz to 2 9 GHz Timebase accuracy aging 5 x107 day External frequency reference input Compatible with power sensor dB relative mode Resolution 0 01 dB Reference accuracy lt 1 2 Tuned RF level mode Tuned RF level accuracy lt 0 15 dB Tuned RF level frequency range 300 MHz 1 MHz Frequency range 300 kHz to 2 9 GHz Maximum SWR 1 1 1 MHz to 2 0 GHz 1 30 2 0 GHz to 2 9 GHz Range 15 V d
133. nt Attenuator Setting Uncertainty dB Cumulative dB Step to Step dB dB 0 0 Ref 0 Ref 0 Ref 10 0 40 20 0 07 0 08 30 0 09 40 0 10 50 0 11 60 0 12 70 3 0 12 0 13 4 8 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 2 Maximum Leveled Output Power 2 Maximum Leveled Output Power Specification Maximum leveled output power gt 0 dBm Related Adjustment Tracking generator power level adjustments Description The tracking generator s RF OUTPUT is connected to the host spectrum analyzer s INPUT 509 Tracking is adjusted at 300 MHz for a maximum signal level The tracking generator s RF OUTPUT is then terminated in 500 The tracking generator is set to specified output level settings and slowly swept from 300 kHz to 2 9 GHz The UNLEVELED indicator is monitored to check for an unleveled condition If the UNLEVELED indicator is not activated during the sweep the tracking generator meets this specification If the UNLEVELED indicator is activated during the sweep the OUTPUT LEVEL vernier setting is decreased until the output remains leveled during the entire sweep This setting is recorded BNC CABLE HOST BNC CABLE SPECTRUM HP 85640A ANALYZER TRACKING GENERATOR LO swp BLANK ING 0 5V GHz 0 5V GHz BLANK ING INPUT INPUT 500 TERMINATION RF soon 7 OUTPUT O sosso H
134. number in step b is greater than 1 This response should be ignored Press SINGLE on the HP 8566A B to verify that the marked signal is a true response and not a random noise peak Wait for the sweep to complete then press PEAK SEARCH A true 4 22 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 20 21 22 23 24 25 26 2T 5 Non Harmonic Spurious Outputs response remains at the same frequency and amplitude on successive sweeps but a noise peak does not If the marked signal is either the fundamental or a harmonic of the fundamental see step 18 or a noise peak see step 19 move the marker to the next highest signal by pressing SHIFT then PEAK SEARCH Continue with step 18 If the marked signal is not the fundamental or a harmonic of the fundamental see step 16 and is a true response see step 17 calculate the difference between the amplitude of marked signal and the fundamental amplitude as listed in Table 4 6 a For example if the fundamental amplitude for a fundamental frequency of 300 kHz is 1 1 2 dBm and the marker amplitude is 30 8 dBm the difference is 32 dBc b Record this difference as the non harmonic response amplitude for the appropriate host spectrum analyzer CENTER FREQ and HP 8566A B START and STOP FREQ settings in Table 4 7 non harmonic amplitude marker amplitude fundamental amplitude If a true non harmonic spurious response is
135. o an ac power source If you want to install your tracking generator in an HP System II cabinet or a standard 19 inch 486 2 mm equipment rack complete instructions are provided with the Option 908 and Option 909 rack mounting kits Caution Before you connect your tracking generator to an ac power source make sure that the line voltage is correct the line voltage selector switch located on the tracking generator rear panel is set to the correct voltage refer to the following paragraphs and the proper fuse is installed You can damage the instrument if you connect it to the wrong voltage 2 2 Installation HP 85640A RF Tracking Generator Operation and Service Manual Power Requirements Table 2 2 Operating Power Requirements 100 120 V ac Operation 220 240 V ac Operation Line Voltage 100 V to 120 V 10 Line Current 1A rms max Line Frequency 47 Hz to 66 Hz HP 85640A RF Tracking Generator Operation and Service Manual 220 V to 240 V 10 0 5 A rms max 47 Hz to 66 Hz Installation 2 3 Setting the Line Voltage Selector Switch Set the tracking generator s rear panel voltage selector switch to the line voltage range 100 120 220 or 240 V corresponding to the available ac voltage Insert a small screwdriver or similar tool in the line module door slot and gently pry open the door Rotate the voltage barrel to the appropriate value WARNING 900000000000000000
136. o coupled sweep time mode for the spectrum analyzer by pressing AUX CTRL TRACKING GENRATOR SWP CPL SA SR until SR is selected 8 Adjust the spectrum analyzer settings according to the measurement requirements For this measurement set the analyzer to frequencies around the minimum reflection region of the filter Change the start frequency to 1 MHz and the stop frequency to 1 GHz Figure 3 35 illustrates what should appear on screen Note On the HP 8560A E HP 8561B E or HP 8563A E the minimum resolution bandwidth supported in stimulus response measurements is 300 Hz ATTEN 10dB MKA a47 50dgm RL OOE TOOR 500 5MHZ STOP 1 0p00 GHz START 2 0MHz STOP 4 0000GHZz ABW 1 0MHz VBW 1 0MHz SWP DO Figure 3 35 Spectrum Analyzer Display of Bandpass Filter Region To store an open short average reference trace 9 Remove the DUT 10 Press AUX CTRL TRACKING GENRATOR SOURCE CAL MENU CAL OPN SHRT 11 The analyzer will prompt you to connect the open Figure 3 36 3 32 Operation HP 85640A RF Tracking Generator Operation and Service Manual ATTEN 10dB MKA 18 17dBm RL OOE TOOR 500 5MHZ Connect OPEN Store when ready START 4 0MHZ STOP 4 0000GHZz ABW 1 0MHz VBW 1 0MHz SWP DO Figure 3 36 On Screen Prompts to Connect an Open HEWLETT EN INSTRUM
137. on 7 23 Ab line filter switch assembly circuit description 7 23 A5 line filter switch assembly replacement 7 16 electrostatic discharge 7 2 excessive FM 7 26 flatness out of tolerance 7 27 output unleveled 7 24 rebuilt exchange assemblies 7 6 replacement procedures 7 6 replacing Al attenuator 7 8 replacing A2 tracking generator 7 10 replacing A3 interface board assembly 7 12 replacing A4 power supply 7 14 replacing the instrument cover 7 7 returning the instrument for service 7 4 spectrum analyzer to tracking generator system block diagram 7 20 tracking generator block diagram 7 20 tracking generator circuit description 7 18 tracking generator circuit troubleshooting 7 18 troubleshooting 7 24 HP 85640A RF Tracking Generator Operation and Service Manual setting 5 V GHz rear panel output 3 6 shipping 2 2 7 4 specifications 1 6 10 stimulus response measurement equipment needed 3 7 T thru trace 3 15 3 26 tracking adjust knob 3 2 tracking errors 3 13 3 25 tracking generator circuit description A attenuator 7 21 A2 tracking generator 7 21 A3 interface assembly 7 22 A4 power supply 7 23 Ab line filter switch assembly 7 23 tracking generator feedthrough performance test 4 27 tracking generator host spectrum analyzer connections 3 5 HP 85640A RF Tracking Generator Operation and Service Manual transmission measurement example adjusting the range level 3 18 3 28
138. on stages followed by a frequency doubler and A3U4 a factory selected attenuator A3U4 is used to set the output power from the converter to 8 dBm at 600 MHz The circuit s 300 MHz notch filter eliminates the 300 MHz fundamental signal The power level of the A2 tracking generator is controlled by both the front panel OUTPUT LEVEL vernier and the rear panel 0 5V GHz INPUT from the host spectrum analyzer The 0 5V GHz INPUT provides slope flatness compensation to the output power level The A2 tracking generator provides the ALC MON ALC monitor control line to the A3 interface The A2 output is leveled when ALC MON is between 0 545 V and 1 09 V The unlevel detector buffers ALC MON and feeds this signal to a window comparator The window comparator output is low when the output is unleveled It is normal for the output to be unleveled momentarily during retrace The host spectrum analyzer s BLANKING signal prevents a flashing UNLEVELED LED during retrace The BLANKING signal is high during retrace and low during a sweep The power supply circuitry provides added filtering for the 15 V and 15 V supplies and regulators for the 5 V and 10 V supplies The tracking control circuitry generates the TUNE control line This control line determines the A2 tracking generator s tracking oscillator frequency Tracking is controlled by setting the front panel TRACKING ADJUST potentiometer and ASR1 COR TRACK coarse tracking Noise o
139. ons 3 2 G general information calibration cycle 1 4 characteristics 1 11 serial numbers 1 4 specifications 1 6 H harmonic spurious outputs performance test 4 16 host spectrum analyzers 4 1 HP 8560A E HP 8561B E HP 8563A E reflection measurements 3 30 transmission measurements 3 9 HP 8561A HP 8562A B reflection measurements 3 37 transmission measurements 3 21 I input power 3 4 installation information compatibility with host spectrum analyzer 2 1 inspection 2 2 power requirements 2 3 preparation for use 2 2 sales and service offices 2 9 instrument description 7 18 21 L level flatness performance test 4 12 line switch 3 2 LO feedthrough amplitude performance test 4 24 LO input 3 2 Index 1 M major assembly and cable locations 6 2 4 maximum leveled output power performance test 4 9 mechanical replaceable parts 6 4 6 N non harmonic spurious outputs performance test 4 19 0 operation front panel features 3 2 rear panel features 3 4 reflection measurement example HP 8560A E HP 8561B E HP 8563A E 3 30 reflection measurement example HP 8561A HP 8562A B 3 37 setting 5 V GHz rear panel output 3 6 tracking generator and host spectrum analyzer connections 3 5 transmission measurement example HP 8560A E HP 8561B E HP 8563A E 3 9 transmission measurement example HP 8561A HP 8562A B 3 21 output attenuator accuracy performance test 4 6 output level k
140. or uses the 300 MHz calibrator signal 3rd LO of the host spectrum analyzer to drive the tracking generator is the output signal of the tracking generator allows you to adjust for any tracking errors that may result from differences between the tracking generator output frequency and the frequency to which the spectrum analyzer is tuned The tracking adjust knob is non linear clockwise and counter clock wise rotation will not necessarily have an equal effect on the displayed signal adjust the tracking generator s output power The vernier left hand knob makes fine resolution adjustments while the right hand knob adjusts the attenuator from 0 dB to 70 dB in 10 dB increments lights when an unleveled condition is detected except during retrace Table 3 1 Front Panel Interconnections Frequency Range Amplitude Limits LO INPUT SMA female 3 9107 GHz 6 8107 GHz 16 5 dBm 2 0 dB 300 MHz INPUT BNC female N A 10 dBm 1 0 dB RF OUTPUT Type N female 300 kHz 2 9 GHz Maximum output power 0 dBm 3 2 Operation Minimum output power 80 dBm HP 85640A RF Tracking Generator Operation and Service Manual RF OUTPUT LO INPUT OUTPUT TRACK ING LEVEL UNLEVELED ADJUST VERNIER LED I OUTPU LEVEL ATTEN Q SES I o 30 dBm TW MAX
141. ork stations Refer to Figure 7 1 for an example of a static safe work station Removal Remove the instrument cover as described on page 7 7 Refer to Figure 7 4 and remove the following five cable assemblies from the tracking generator circuitry Use caution when handling the semirigid cables they should not be bent D W2 from A2J1 W10 from A2J2 9 W8 from A2J4 D W3 from A2J6 5 W5 from A2J8 Rotate the instrument onto its front panel Hold the A2 tracking generator as you remove the three screws that attach it to the chassis Replacement 4 5 6 Orient A2 with A2J2 A2J3 and A2J4 facing toward the front of the instrument Attach A2 to the instrument chassis with the three screws tightened to six inch pounds Replace the following five cable assemblies Use caution when handling the semirigid cables they should not be bent D W2 to A2J1 O W10 to A2J2 O WR to A2J4 O W3 to A2J6 W5 to A2J8 Tighten the semirigid cable assemblies to eight inch pounds 7 10 Service Information HP 85640A RF Tracking Generator Operation and Service Manual 3 PLACES BENEATH A2 6 E 2 wk243 Figure 7 4 A2 Tracking Generator Assembly Replacement HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 11 A3 Interface Board Assembly Replacement Caution The tracking generator assemblies are static sens
142. pectrum Analyzer Figure 1 1 contains the cable part numbers included with your tracking generator at shipment Use these cables to connect your portable tracking generator to a compatible spectrum analyzer Figure 2 3 and Figure 2 4 illustrate the proper cable connections between the tracking generator and an HP 8561B spectrum analyzer Any of the compatible spectrum analyzers is connected to the same inputs and outputs as illustrated in these figures Note Connect the cables with the tracking generator placed beneath the portable spectrum analyzer to prevent the cables from obscuring your view of the display during operation A A q STRUNENT STATE L 90000 th oO O32000 E P C I O C3 CA L LT CJ QF o ee IST LO IF VOLUME OUTPUT OUTPUT OUTPUT OO00 O00 Us 2 E IOkHz 2 9GHz RP TRAGK GENERATOR 8 wk26 Figure 2 3 Front Panel Cable Connections HP 85640A RF Tracking Generator Operation and Service Manual Installation 27 O La VIDEO EXT TRIG BLANKING OUTPUT INPUT OUTPUT
143. peration 3 25 Calibrate Notice that the output power of the tracking generator is not perfectly flat as previously shown in Figure 3 21 This is due in part to the frequency response error inherent in all scalar network measurement systems Normalization is a technique used to eliminate frequency response errors thereby increasing the amplitude accuracy of the measurement Before normalizing a reference trace must be taken For transmission measurements this reference trace is referred to as a thru because the reference trace is measured with the DUT removed from the system For reflection measurements an open short average is used Because you are making a transmission measurement a thru reference trace must be stored To store the thru trace 11 Remove the DUT replacing it with a barrel connector for optimum measurement integrity Connect the thru as shown in Figure 3 28 EE RN e CO O DO DO 00 DONO UUJ oo O00 Upu DODD n R QHR Figure 3 28 Thru Connected for Calibration Rout
144. quency Tracking Range Test Setup 4 32 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 8 Frequency Tracking Range Equipment Host spectrum analyzer HP 8560A E 8561A B E HP 8562A B or HP 8568A E Power splitter cesses e HP 11667A Frequency counter lesse e han HP 5343A Cables Type N 62 em 24 in 2 required seesseseeeee eh HP 11500B C BNC 62 cm 24 in 3 required 6 0 ete ent e nen 8120 1839 SMA 52 cm 20 in 2 nre 5061 9038 BNC 122 em 48 in lt HP 10508A Adapters Type N m to Type N m RII hrs 1250 1475 Type N m to APC 3 5 f Rma 1250 1745 Procedure 1 Connect the equipment as shown in Figure 4 9 Use the type N cable to connect the tracking generator s RF OUTPUT to the host spectrum analyzer s INPUT 509 2 Press PRESET on the host spectrum analyzer and set the controls as follows CENTER FREQ esssseeeeee III n 500 MHz SPAN essseeesseeees eee me ee e e e e 0 Hz RES BW oo ee mme nh e e eee eees 300 Hz 3 If the host spectrum analyzer is an HP 8561A HP 8562A or HP 8562B press SWEEP REAR PNL OUTPUT 5 V GHz FAV 4 If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press AUX CTRL REAR PANEL 5 V GHz FAV On the tracking generator set the OUTPUT LEVEL vernier knob to 5 dBm Set the OUTPUT LEVEL attenuator knob to 0 dB then adjust TRACKING ADJUST to display a maximum signal level
145. quency is greater than 2 5 GHz press PRESEL PEAK and wait for the message to disappear Verify that the marked signal is not the fundamental or a harmonic of the fundamental as follows a Divide the marker frequency by the fundamental frequency the host spectrum analyzer center frequency setting For example if the marker frequency is 880 kHz and the fundamental frequency is 300 kHz dividing 880 kHz by 300 kHz yields 2 933 b Round the number calculated in step a to the nearest whole number In the example above 2 933 should be rounded to three c Multiply the fundamental frequency by the number calculated in step b Following the example multiplying 300 kHz by three yields 900 kHz d Calculate the difference between the marker frequency and the frequency calculated in step c above Continuing the example the difference would be 20 kHz e Due to span accuracy uncertainties in the HP 8566A B the marker frequency might not equal the actual frequency Given the marker frequency check if the difference calculated in step d is within the appropriate tolerance m For marker frequencies 5 MHz tolerance 200 kHz m For marker frequencies 55 MHz tolerance 750 kHz m For marker frequencies gt 55 MHz tolerance 10 MHz f If the difference in step d is within the indicated tolerance the signal in question is the fundamental signal if the number in step b equals 1 or a harmonic of the fundamental if the
146. r f O 88888 pR ooo OSEE 8 INPUT DO O eg DU 5o00 a LO 1ST LO INPUT 504 INPUT OUTPUT SMA CABLE CAL BNC CABLE OUTPUT TYPE N CABLE wk222 Figure 4 3 Maximum Leveled Output Power Test Setup Equipment Host spectrum analyzer HP 8560A E 8561A B E HP 8562A B or HP 8568A E 500 termination 2 0 ehh nnn HP 908A Cables Type N 62em 24 in lseeseeeeeeeeee e hen HP 11500B C BNC 62 cm 24 in 3 required 6 0 ete ent e nen 8120 1839 SMA 52 cm 20 in 2 cc rh hse 5061 9038 HP 85640A RF Tracking Generator Operation and Service Manual Performance Tests 4 9 2 Maximum Leveled Output Power Procedure 1 Connect the equipment as shown in Figure 4 3 Use the type N cable to connect the tracking generator s RF OUTPUT to the host spectrum analyzer s INPUT 500 Press PRESET on the host spectrum analyzer and set the controls as follows CENTER FREQ 2 eI 300 MHz SPAN 0 Hz If the host spectrum analyzer is an HP 8561A HP 8562A or HP 8562B press SWEEP REAR PNL OUTPUT 5 V GHz FAV If the host spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press AUX CTRL REAR PANEL 5 V GHz FAV On the tracking generator set the OUTPUT LEVEL vernier knob to 5 dBm Set the OUTPUT LEVEL attenuator knob to O dB then adjust TRACKING ADJUST to display a maximum signal level on the host spectrum analyzer Note The OUTPUT LEVEL vernier is prone to parallax error To minimiz
147. r output harmonic level variation replace the host spectrum analyzer connection to the LO INPUT on the tracking generator and repeat step one while measuring the 1st LO signal at A2J3 temporarily remove AT1 7 If the lst LO harmonic level variation measured at A2J3 relative to the IST LO OUTPUT is slight and the relative harmonic variation tracks the tracking generator s output harmonic level suspect the host spectrum analyzer s 1ST LO OUTPUT 8 If the 1st LO harmonic level variation versus frequency does not track the tracking generator output harmonic level variation suspect the A2 assembly If sidebands are present at the same frequency offset at every output frequency check the spectral purity of the LO INPUT and 600 MHz drive signals with another spectrum analyzer Set the host spectrum analyzer to zero span when checking the 1st LO Use the method described above to determine the 1st LO frequency A 1 MHz sideband on the 1st LO appears as a 1 MHz sideband on the output signal 7 28 Service Information HP 85640A RF Tracking Generator Operation and Service Manual 1 To verify whether the 600 MHz drive or 1st LO signal is responsible for sidebands substitute a clean signal for the 600 MHz drive or LO INPUT 2 If the sidebands on the output disappear when using the clean signal the substituted signal is responsible for the sidebands Note The 600 MHz drive signal should be 8 dBm 3 5 dB The Ist LO signal should be 16 d
148. re 5 4 Attenuator A3U4 Location Equipment Host spectrum analyzer HP 8560A E HP 8561A B E HP 8562A B HP 8563A E Cables BNC 62 em 24 in 2 eee ehe 8120 1839 BNC 122 mAB HP 10503A Adapters Type N m to BNC f 0 ccc cence hh 1250 1476 BNC f to SMB uusssseeeeeeee cence rh 1250 1236 Procedure 1 Set the HP 85640A LINE switch to OFF Disconnect all cables from the tracking generator 5 8 and remove the cover assembly refer to Removing and Replacing the Instrument Cover in Chapter 7 Place the tracking generator in the service position See Figure 5 3 Disconnect W5 from A3J5 see Figure 5 4 Turn the tracking generator LINE switch ON Check the host spectrum analyzer s CAL OUTPUT amplitude using the appropriate performance test in the spectrum analyzer s installation and verification manual If the amplitude does not meet the specification correct the problem before continuing with this procedure Connect the equipment as shown in Figure 5 3 with the 122 cm BNC cable between the host spectrum analyzer s CAL OUTPUT and INPUT 500 connectors Adjustment Procedures HP 85640A RF Tracking Generator Operation and Service Manual 2 600 MHz Level Adjustment 5 Press PRESET on the host spectrum analyzer and set the controls as follows CENTER FREQ sseeeee tne ene ran 300 MHz CF STEP cce eee ea aen 300 MHz SI wa OA E 20 MHz 6 If the host
149. rform the Coarse Adjustment Rotate the TRACKING ADJUST fully clockwise The frequency counter should read greater than 300 007 MHz If the frequency counter reads less than 300 007 MHz perform the Coarse Adjustment Coarse Adjustment Remove the dust cap screw used to seal the tracking oscillator adjustment See Figure 5 7 Rotate A3RI COR TRACK fully clockwise Rotate A3R1 COR TRACK three turns counterclock wise Rotate the TRACKING ADJUST control fully clockwise Record the frequency counter reading in Table 5 7 as F1 HP 85640A RF Tracking Generator Operation and Service Manual Adjustment Procedures 5 17 16 Rotate the TRACKING ADJUST control fully counterclockwise Record the frequency counter reading in Table 5 7 as F2 17 Calculate Fcenter as shown below and record the result in Table 5 7 FcENTER F1 F2 2 18 Set TRACKING ADJUST for a frequency counter reading of Fcgwrgn 100 Hz Note The coarse adjustment A2C3 is rated for a maximum of 10 adjustment cycles Because of this limitation adjust AZC3 only when absolutely necessary 19 Adjust A2C3 until the frequency counter reads 300 MHz 500 Hz 20 Repeat steps 15 through 19 at least once more until no further adjustment of A2C3 is necessary 21 Set the tracking generator LINE switch to OFF Replace A2 dust cap screw 22 Repeat the fine adjustment procedure steps four through 12 Table 5 7 Tracking Oscillator Range Centering F1 MHz F2
150. rrors contained herein or for incidental or consequential damages in connection with the furnishing performance or use of this material HP part number 85640 90005 Printed July 1992 This manual applies to HP 85640A RF tracking generators with serial numbers prefixed 2918A and below Copyright Hewlett Packard Company 1989 1992 All Rights Reserved Reproduction adaptation or translation without prior written permission is prohibited except as allowed under the copyright laws 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 National Institute of Standards and Technology 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 instrument product is warranted against defects in material and workmanship for a period of one year from date of shipment During the warranty period Hewlett Packard Company will at its option either repair or replace products which prove to be defective For warranty service or repair this product must be returned to a service facility designated by HD Buyer shall prepay shipping charges to HP and HP shall pay shipping charges to return the product to Buyer However Buyer shall p
151. span or other analyzer settings may cause a change in sweep time Setting Sweeptimes Accurate stimulus response measurements typically can use sweeptimes much faster than auto coupled sweeptimes The following procedure calculates the fastest sweeptime for stimulus response measurements assuming the span is less than 20 times the bandwidth of the DUT 1 Note the autocoupled sweeptime 2 Calculate each of the following a span Hz 156 GHz b 500 resolution bandwidth Hz c 200 video bandwidth Hz 3 Determine the greatest of the values in steps 2a 2b and 2c 4 Set sweeptime to the smaller of the values in steps 1 and 3 The analyzer will limit sweeptime to 50 msec or less in non zero spans If the value in step 4 is less than the auto coupled sweeptime the indicator will be displayed this message may be ignored as it has no effect on the outcome of the measurement 7 Decrease resolution bandwidth to reduce the displayed average noise level Press RES BW J on the spectrum analyzer Note the decrease in amplitude due to the tracking error HP 85640A RF Tracking Generator Operation and Service Manual Operation 3 23 8 Narrow the video bandwidth to smooth the noise press BW VIDEO BW J on the spectrum analyzer In Figure 3 25 video bandwidth is set at 300 Hz 9 Recalculate the sweeptime as described in the note above ATTEN 10dB RL OOE TOOR MEAS UNCALL but al
152. spectrum analyzer is an HP 8560A E HP 8561B E or HP 8563A E press PEAK SEARCH CAL REF LVL ADJ If the host spectrum analyzer is an HP 8561A HP 85624 or HP 8562B press MORE REF LVL CAL 7 Use the knob or step keys to adjust the displayed REF LEVEL ADJ amp for a marker amplitude reading of 10 00 dBm 0 17 dB 8 Connect the 62 cm BNC cable between the host spectrum analyzer CAL OUTPUT and the tracking generator 300 MHz INPUT Connect the 122 cm BNC cable between A3J5 using an adapter on the tracking generator and the INPUT 500 on the spectrum analyzer 9 Press FREQUENCY CENTER FREQ 600 MHz PEAK SEARCH on the host spectrum analyzer and record the marker amplitude reading below Initial 600 MHz amplitude dBm 10 Calculate the amount of difference in attenuation required to set the amplitude to 8 dBm as indicated below Round the calculated value to the nearest whole number attenuation difference initial 600 MHz amplitude 8 dBm Attenuation difference rounded dBm 11 If the attenuation difference rounded is lt 1 dB disconnect the BNC cable from A3J5 and reconnect W5 to A3J5 a new value of A3U4 need not be selected If the attenuation difference is greater than 1 dB continue with this procedure Note The following steps should be performed only if the attenuation difference is greater than 1 dB 12 Set the tracking generator LINE switch to OFF Remove the top shield from the A3 interface assembly
153. t Tracking oscillator range adjustment Description The tracking generator s RF OUTPUT is connected through a power splitter to the host spectrum analyzer s INPUT 500 Tracking is adjusted at 500 MHz for a maximum signal level The other output of the power splitter is connected to a frequency counter The frequency value displayed on the counter is recorded The TRACKING ADJUST vernier knob is set fully clockwise then the frequency value is recorded and compared with the first frequency measurement TRACKING ADJUST vernier knob is then set fully counterclockwise The frequency value is recorded and compared with the first frequency measurement If the frequency tracking range does not meet the characteristic perform the tracking oscillator range adjustment located in Chapter 5 Adjustment Procedures BNC CABLE HOST SPECTRUM HP 85640A BNC CABLE ANALYZER TRACKING GENERATOR LO SWP BLANK ING 0 5V GH 0 5V GHz BLANK ING i e INPUT INPUT RF To To LIC SS OUTPUT O Sosa o Cd ooooa i 3 RE ues 9 000 OSes 8 INPUT g 200000 00 ooo O LO 1ST LO INPUT 509 INPUT OUTPUT SMA CABLE CAL OUTPUT m ADAPTER BNC CABLE TYPE N CABLE POWER SPLITTER Jt FREQUENCY COUNTER AH Gao ooo OI ADAPTER SS Bs O C JL 00 MHz 26 5 GHz wk228 Figure 4 9 Fre
154. t it indicates that the tracking generator output is unleveled The tracking generator can typically provide up to 1 2 8 dBm of output power and remain leveled In any case the output should remain leveled for output power settings less than the specified maximum leveled output power Refer to the specifications in Table 1 1 for more information It is normal for the tracking generator to be unleveled at frequencies below 300 kHz The ALC MON line is monitored continuously therefore if the output is unleveled for only part of a sweep the UNLEVELED LED only lights during the unleveled condition The LED may turn off before the sweep is completed If the UNLEVELED LED remains lit proceed as follows 1 Determine which frequencies cause the unleveled condition a Do this by setting the host spectrum analyzer to zero span and a 5 second sweep time b Step the center frequency in 50 MHz increments c Note and record which frequencies cause the unleveled condition 2 Determine which power levels cause the unleveled condition a Connect the tracking generator s RF OUTPUT to the host spectrum analyzer s INPUT 509 b Set the host spectrum analyzer to zero span and CENTER FREQ to 300 MHz or to one of the frequencies noted in step 1 c Maximize the amplitude response displayed on the host spectrum analyzer with the TRACKING ADJUST control d Increase the OUTPUT POWER vernier setting from 10 dBm to 0 dBm e Note and record the power
155. t spectrum analyzer HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 25 Excessive Residual FM The tracking oscillator or the ALC circuitry may be responsible for excessive residual FM Residual FM can be measured on another spectrum analyzer such as an HP 8566A B or HP 8568A B using slope detection with the host spectrum analyzer set to zero span 1 Perform the residual FM performance test for the host spectrum analyzer as described in the analyzer s installation and verification manual If the analyzer passes this test the analyzer s LO INPUT and 300 MHz INPUT signals probably are acceptable If the analyzer fails the test examine the host spectrum analyzer s synthesizer section 2 Monitor A3J1 pin 5 TUNE with an oscilloscope a Connect the ground lead of the oscilloscope probe to the negative end of A3C27 b The voltage at this point should be greater than 500 mV If the voltage is less than 500 mV perform the tracking oscillator range performance test in Chapter 4 of this manual c If the instrument fails this test perform the tracking oscillator range adjustment in Chapter 5 of this manual d If noise on this tune line is greater than 10 mV examine the tracking control circuitry on A3 9 Monitor the output of the tracking generator with another spectrum analyzer a Check for high amplitude spurious responses from 100 kHz to at least 3 GHz b If the spurious responses amplitud
156. the Type N cable connected between the tracking generator RF OUTPUT and the host spectrum analyzer INPUT 500 connectors Set the LINE switch to ON 2 Connect the positive DVM test lead to ASTP4 and the negative DVM test lead to the negative side of A3C27 Refer to Figure 5 6 3 Set the OUTPUT LEVEL attenuator to 10 dB and the OUTPUT LEVEL vernier to 4 dBm HP 85640A RF Tracking Generator Operation and Service Manual Adjustment Procedures 5 13 3 Power Level Adjustments Note The OUTPUT LEVEL vernier is prone to parallax error To minimize parallax when setting the knob view the pointer and the scale marking directly from the front of the instrument panel The ridges on the knob are also useful for properly aligning the pointer with the scale marking Set the DVM controls as follows FUNCTION eeeeeRR RII e hn DC VOLTS RANGE ooo aaa mm eth e nena 10V If the DVM reads 2 5 V 0 1 V continue at step 8 Otherwise continue to step 6 6 Loosen the set screws that secure the OUTPUT LEVEL vernier knob to the vernier control 10 11 12 13 14 15 16 17 18 19 20 shaft Remove the vernier knob Adjust the shaft for a DVM reading of 2 5 V 0 1 V Without moving the position of the control shaft replace the vernier control knob with the pointer set to 4 dBm Repeat step 5 Press on the host spectrum analyzer and set the controls as follows CENTER FREQ
157. uiring a nonmetallic tuning tool refer to the equipment list in Chapter 4 for the fiber tuning tool part number Never try to force an adjustment control This is especially critical when tuning variable capacitors and slug tuned inductors Refer to Table 4 1 for any other required service accessory part numbers Table 5 1 Adjustment Procedures and Equipment Used Adjustment Adjustment Name Equipment Used Number 1 Power supply adjustments and checks Digital voltmeter 2 600 MHz level adjustment Host spectrum analyzer 3 Power level adjustments Host spectrum analyzer Power sensor Measuring receiver Digital voltmeter 0 05 in balldriver 4 Tracking oscillator range adjustment Microwave frequency counter Host spectrum analyzer Non metallic alignment tool A host spectrum analyzer can be any one of these models HP 8560A or HP 8560E spectrum analyzer non Option 002 HP 8561A HP 8561B or HP 8561E spectrum analyzer HP 8562A or HP 8562B spectrum analyzer HP 8563A or HP 8563E spectrum analyzer 5 2 Adjustment Procedures HP 85640A RF Tracking Generator Operation and Service Manual Table 5 2 Post Repair or Specification Failure Adjustment List Assembly Changed Adjustment or Repaired Perform adjustment s in the order listed Number Al output attenuator Power level adjustments 3 A2 tracking generator assembly Power level adjustments 3 Tracking oscillator range adjustment 4 A3 interface assembly 600 MHz level adjustment 2
158. ustment procedure at a static safe workstation Refer to Figure 7 1 for an example of a static safe workstation DIGITAL VOLTMETER ADAPTER P 5 ooo oooo O S Sescsssssa CX BNC CABLE HOST TEST BNC CABLE SPECTRUM LEADS ANALYZER HP 85640A LO swP TRACKING GENERATOR As BLA cine 0 5v GHz SHOWN IN SERVICE POSITION TP4 9 5V GHz BLANK ING INPUT y INPUT mw 2209200 D O aaa O O E E 8 ao 0960 gp sas E RF 300 LO 1ST LO CAL OUTPUT MHz INPUT OUTPUT OUTPUT INPUT SMA CABLE BNC CABLE MEASURING RECEIVER Dii en ca 99090 nngnonu 0000 Q 00000 0000 n n Bu a O O o00p0p 40000 O SENSOR POWER SENSOR Figure 5 5 Power Level Adjustment Setup 5 12 Adjustment Procedures HP 85640A RF Tracking Generator Operation and Service Manual 3 Power Level Adjustments
159. ve Perform assembly procedures at static safe work stations Refer to Figure 7 1 for an example of a static safe work station Removal 1 Remove the instrument cover as described on page 7 7 2 Remove W9 D and W10 See Figure 7 3 3 Use a 0 05 inch hex driver to loosen the two set screws on the attenuator shaft adapter Pull the attenuator knob and attenuator shaft adapter forward as far as it can go 4 Remove the two screws 5 holding the attenuator to the attenuator bracket Replacement 5 Rotate the attenuator shaft fully clockwise 6 Connect the replacement attenuator to the attenuator bracket by replacing and start tightening the two screws 5 7 Replace the attenuator adapter and secure it with the two allen screws 8 Move the attenuator to align the knob properly with the front panel markings Tighten the set screws 5 to six inch pounds 9 Reconnect W9 D and W10 Tighten them to eight inch pounds each 7 8 Service Information HP 85640A RF Tracking Generator Operation and Service Manual 2 PLACES 3 4 5 2 PLACES wk242 Figure 7 3 Al Attenuator Replacement HP 85640A RF Tracking Generator Operation and Service Manual Service Information 7 9 A2 Tracking Generator Assembly Replacement Caution The tracking generator assemblies are static sensitive Perform assembly procedures at static safe w
160. y can be used to tune to center frequencies above 100 MHz 14 Record the most positive flatness reading in Table 4 4 as the maximum flatness Maximum flatness dB 15 Record the most negative flatness reading in Table 4 4 as the Minimum Flatness Minimum flatness dB 4 14 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 3 Level Flatness Table 4 4 Flatness Relative to 300 MHz Center Frequency Flatness dB CAL Factor Measurement Frequency MHz Uncertainty dB 300 kHz 0 3 0 28 0 28 500 kHz 0 3 0 28 0 28 1 MHz 1 0 28 0 28 2 MHz 3 0 28 0 28 5 MHz 3 0 28 0 28 10 MHz 10 0 24 0 24 20 MHz 30 0 24 0 24 50 MHz 50 0 24 0 24 100 MHz 100 0 24 0 24 200 MHz 300 0 24 0 24 300 MHz 300 0 24 0 24 400 MHz 300 0 24 0 24 500 MHz 300 0 24 0 24 600 MHz 300 0 24 0 24 700 MHz 1000 0 24 0 24 800 MHz 1000 0 24 0 24 900 MHz 1000 0 24 0 24 1000 MHz 1000 0 24 0 24 1100 MHz 1000 0 24 0 24 1200 MHz 1000 0 24 0 24 1300 MHz 1000 0 24 0 24 1400 MHz 1000 0 24 0 24 1500 MHz 2000 0 24 0 24 1600 MHz 2000 0 24 0 24 1700 MHz 2000 0 24 0 24 1800 MHz 2000 0 24 0 24 1900 MHz 2000 0 24 0 24 2000 MHz 2000 0 41 0 41 2100 MHz 2000 0 41 0 41 2200 MHz 2000 0 41 0 41 2300 MHz 2000 0 41 0 41 24
161. z 0 3 5 0 30 KHz 1 55 1 80 5 0 55 100 kHz 1 55 1 80 55 1240 1 MHz 1 55 1 80 1240 2000 1MHz 1 55 1 80 2000 2900 1 MHz 3 48 4 01 4 24 Performance Tests HP 85640A RF Tracking Generator Operation and Service Manual 6 LO Feedthrough Amplitude 6 LO Feedthrough Amplitude Specification LO feedthrough lt 26 dBm with output level vernier knob set to O dBm and attenuator knob set to 10 dB Related Adjustment There is no related adjustment for this performance test Description The tracking generator s RF OUTPUT is connected to the host spectrum analyzer s INPUT 509 Tracking is adjusted at 300 MHz for a maximum signal level The tracking generator s RF OUTPUT is then connected to the input of an HP 8566A B spectrum analyzer The tracking generator is tuned to several frequencies and the LO feedthrough is measured at each frequency BNC CABLE MHz HOST SPECTRUM BNC CABLE HP 85640A ANALYZER TRACKING GENERATOR LO SWP BLANKING 0 5V GHz 0 5V GHz BLANK ING Y INPUT INPUT RE To Y LF 65506 OUTPUT soee6 solooo ooo s q on0g0 6 0 DD coo INPUT LO 1ST LO INPUT 509 INPUT OUTPUT SMA CABLE CAL BNC CABLE OUTPUT TYPE N CABLE MICROWAVE SPECTRUM ANALYZER O G o oo o hod b ono O oo o on d so b 005 6 oo m 0000 oo000 uuo O Moooo 50000 goo 00 0000
162. z VBW 1 0MHz SWP DO Figure 3 9 Faster Sweep Times in Stimulus Response Auto Coupled Mode 9 Because this test is for bandpass filter rejection only tune the spectrum analyzer so the filter s roll off takes up most of trace on the display Set the start frequency to 1 MHz and the stop frequency to 1 GHz as shown in Figure 3 10 ATTEN 10dB RL OOE TOOR START 2 0MHz STOP 4 0000GHZz ABW 1 0MHz VBW 1 0MHz SWP DO Figure 3 10 Adjusting the Spectrum Analyzer for Measurement Requirements 10 Decrease resolution bandwidth to reduce the displayed average noise level Press RES BW to select MAN then press J on the spectrum analyzer In Figure 3 11 resolution bandwidth is set at 300 kHz 11 Narrow video bandwidth to smooth the noise press VIDEO BW to select MAN then press UU on the spectrum analyzer In Figure 3 11 video bandwidth is set at 300 Hz 3 12 Operation HP 85640A RF Tracking Generator Operation and Service Manual ATTEN 10dB RL OOE TOOR RES BW 300 Hz owen mmr a emma HHT ara ar a T a START 2 0MHz STOP 4 0000GHZz SABW 300Hz vBw 300Hz SWP 1 78e0 Figure 3 11 Decrease Resolution Bandwidth to Improve Sensitivity 12 Note the decrease in amplitude due to the tracking error Compensate for any tracking errors with the TRACKING ADJUST vernier knob on the HP 85640A see Figure 3 12 ATTEN 10dB RL OOE TOOR E e

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