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HP Refrigerator 8445A User's Manual

1. 10 dB BASE 9 o clock SCAN TIME PER DIVISION 10 MILLISECONDS LOGREFDEVED 5 52 20 LOG LINEAR e Ke AE m 2 ds Ro ew LOG VIDEO FILTER 432345 oe We ERE OFF SCAN MODE eed ee W ws INT SCAN TRIGGER NUR AUTO 222 34 22 che ay Gee eel ge e ON Connect coaxial cable to REMOTE input on Preselector Connect center conductor of coaxial cable to terminal on Power Supply Connect outer conductor of coaxial cable to terminal on Power Supply Connect Sweep Oscillator RF Output to Spectrum Analyzer INPUT Reduce Spectrum Analyzer SCAN WIDTH PER DIVISION to 1 MHz Center signal on CRT display with FREQUENCY control Set SIGNAL IDENTIFIER switch to ON Perform signa identification to ensure signal displayed is result of n 2 mixing mode Set SIGNAL IDENTIFIER switch to OFF Adjust Sweep Oscillator POWER LEVEL and or Analyzer LOG REF LEVEL Vernier for a convenient signal level Record signal level dBm Connect Sweep Oscillator RF output to upper FILTER PORT on Preselector Install rigid coaxial cable between lower FILTER PORT on Preselector and Spectrum Analyzer INPUT Adjust Power Supply Vernier voltage control for maximum signal level indication
2. OFF SCAN MODE INT SCAN TRIGGER LINE c Connect Spectrum Analyzer CAL OUT PUT to INPUT d Adjust FREQUENCY to align LO feed through signal on the 3 graticule line e Check level of 30 MHz signal at CENTER FREQUENCY line Signal level should be 30 dBm Perform AMPL CAL Adjustment if signal level is incorrect See 8555A Operating and Service Manual Note Preselectors with Options 010 and 030 do not have low pass filters installed Dis regard steps f g h and i f Connect Spectrum Analyzer CAL OUT PUT to upper FILTER PORT on Preselector g Connect lower FILTER PORT on Pre selector to Spectrum Analyzer INPUT h Check level of 30 MHz signal at CENTER FREQUENCY graticule line There should be little or no change in level of the 30 dBm signal through the low pass filter in the Preselector i Select BAND n 1 550 MHz IF Note that there is an audible click from coaxial switches in the Preselector and the signal disappears from the CRT display j Select BAND 1 550 MHz IF Connect lower FILTER PORT to Spectrum Analyzer IN PUT k Connect a 2 0 GHz 30 dBm signal to upper FILTER PORT 4 1 Performance Tests 1 Tune Spectrum Analyzer to center 2 0 GHz signal on CRT display m Adjust Preselector FREQ OFFSET to center passband at 2 0 GHz n Select BAND n 2 and connect a 8 0 GHz 30 dBm signal to Preselector upper FIL TER PORT
3. concu Sle bab MANUAL MANUAL TUNE COARSE Wad ce ats fis it b D ya 3 GHz MANUAL TUNE EINE 2322 9069 99 uox EURO dr SUR Eg 0 GHz POWER SUPPLY Qutp t Voltage i qis g EIE Venom Sg te LAS 3 Vdc ANALYZER BAND Eug S uve ILE TX Guess n 2 FREQUENCY ta e l aaa ba q Aa S b w fa sa S S w k Sag b Gs 3 GHz BANDWIDTH 2 mas y ate Sus ae atest W w 300 kHz SCAN WIDTH PER ee 10 MHz 4 3 Performance Tests Model 8445 PERFORMANCE TESTS 4 14 Out of Band Rejection cont d INBUT ATTENUXTION sora kfz Se a ke C SA 10 dB BASE LINE CLIPPER iu xL WW Gina 12 o clock SCAN TIME DIVISION 10 MILLISECONDS LOG REF LEVEL ee ae Bo oS eme xs 20 dBm DT LOG VIDEO FIETER Wg a ee ep gU 10 kHz SIGNAL GENERATOR FREQUENCY tee ae 3 GHz AETRENUATION ie ce es eee ee ee lee bee es 20 dB ALEC CAL OUTPUT EPA Cus RE 0 dBm on meter 2 Adjust Signal Generator frequency to center signal in Preselector passband indicated by maximum signal level displayed on CRT 3 Adjust Spectrum Analyzer FREQUENCY control to center signal on CRT display 4 Record Signal Generator frequency 5 Adjust Spectrum Analyzer LOG REF LEVEL Vernier control to set signal peak on CRT LOG REF l
4. Figure 3 3 Option 020 Controls Connectors and Indicators 1 of 2 3 4 Model 8445 Operation OPTION 020 LINE ON OFF Controls primary power Light glows when switch is energized 1 bulb PRESELECTOR INSERTION LOSS Chart Indicates insertion loss versus frequency Calibration chart extrapolated from point to point measurements of Yig filter insertion loss during final tests FREQ OFFSET control adjusted for minimum insertion loss at each test point During power level measurement Spectrum Analyzer LOG REF LEVEL Vernier con trol may be adjusted to compensate for the indicated insertion loss FREQ OFFSET Adjusts Yig driver to compensate for offset in Yig filter tuning due to residual mag netism in core structure Adjusted to center the Yig filter at 2 0 GHz for wide range tracking Adjusted for minimum filter insertion loss during power level measurements See Figure 3 5 Operational Adjust ments 1 8 to 18 GHz TRACKING Adjusts Yig driver gain to match linear current frequency curve of Yig filter Adjusted during Operational adjustments at a frequency of 8 GHz Adjustment required to match tuning of Preselector with tuning of Spectrum Analyzer Interacts with FREQ OFFSET adjustment See Figure 3 5 Opera tional Adjustments 1 8 to 18 GHz COARSE Option 020 030 instruments Manual Yig filter frequency tune control Sets Yig filter center frequency in manual operating mode
5. A fame ter da re m es eS wa amy a gis 51 6 gt 0050 OR 550 MHz 7 1 i BAND CODE EE n AMPL 9 1 FROM PINS 9 K POWER SUPPLY ASSY A2 ie REMOTE CONTROL AMPL E REMOTE s 1 GHz V a PIO OPTIONS 0200030 i4oy 1M eased see th IS ST Id mam 19 5V m 23V 9K cose POWER GROUND 12 A 2 i MANUAL CONTROL AMPL JE __ NOTES A 20V JUMPERED FROM 8555A INPUT TO XA3 PINS 4 amp D FOR OTHER THAN 020 030 A 19 5 V JUMPERED FROM MANUAL CONTROL FOR OPTIONS 020 030 q P O AS A INHIBIT SIGNAL Y 1G LOW PASS FILTER SWITCH CONTROL A FILTER PORTS CONNECCT DIRECTLY TO YIG FILTER FOR OPTIONS 010 amp 030 A YIG DRIVE SIGNAL PAATH FOR OPTIONS 020 030 A JUMPER FROM XA5 13 TO PIN 3 EXCEPT FOR OPTIONS 020 030 POAS _ YIG DRIVER ASSY A3 P O POWER SUPPLY ASSY A2 Aa p ec mg T 1 eos 1 ENT pe m gt BAND 2 4 LOW PASS E FILTER FROM gt gt SWITCH 8555A 5116 BIT E YIGI DRIVER LOW PASS pos FILTER PWR XAS SWITCH 40V w l contro LEND 1 9 11 Si lt lt 7 POWER GROUND i INPUT FROM POWE
6. o Tune Spectrum Analyzer FREQUENCY control to center signal on CRT display p Adjust Preselector TRACKING control to maximize signal level on CRT display Repeat steps through for optimum adjustment 4 9 PERFORMANCE TESTS 4 10 The performance tests given in this section are suitable for incoming inspection troubleshoot ing or preventive maintenance During any performance test all shields and connecting hard ware must be in place The tests are designed to verify published instrument specifications Perform Model 8445A the tests in the order given and record data on test card Table 4 1 and or in the data spaces provided in each test 4 11 The tests are arranged in the following order Paragraph Test Description 4 14 Out of Band Rejection 4 15 Low Pass Filter Insertion Loss 4 16 Yig Filter Insertion Loss 4 17 Limiting Level Signal Compression 4 12 Each test is arranged so that the specifica tion is written as it appears in Table 1 1 Specifica tions Next a description of the test and any special instructions or problem areas are included Each test that requires test equipment has a test setup drawing and a list of required equipment Step 1 of each procedure gives control settings required for that particular test 4 13 Required minimum specifications for test equipment are detailed in Table 1 3 If substitute test equipment is used it must meet the specifica tions listed in orde
7. 1901 0159 680 CR7 W 10 Q9 INPUT FROM 8555A RF SECTION SERIAL PREFIX NO 1118 PIO INTERCONNECT BOARD A5 CHASSIS Nu P 19 5V 1 ual 19 5 Vdc 1 03 5 H n In EE 3 5 x H 1 l NOTES w POWER GROUND SIGNAL GROUND 1 SEE SCHEMATIC DIAGRAM NOTES TABLE 8 3 REFERENCE DESIGNATIONS WITHIN OUTLINED ASSEMBLIES ARE ABBREVIATED FULL DESIGNATION IN CLUDES ASSEMBLY NUMBER RI OF ASSEMBLY Al 15 AIRI DESIGNATIONS OF OTHER COMPONENTS ARE COMPLETE AS SHOWN Figure 8 21 Power Supply Assembly A2 Schematic Diagram MANUAL CHANGES MANUAL IDENTIFICATION Model Number 8445 Date Printed Oct 1971 Part Number 08445 90002 This supplement contains important information for correcting manual errors and for adapting the manual to instruments containing improvements made after the printing of the manual To use this supplement Make all ERRATA corrections Make all appropriate serial number related changes indicated in the tables below Serial Prefix or Number Make Manual Changes Serial Prefix or Number Make Manual Changes 1144A 1 p gt NEW ITEM ERRATA Page 1 3 Table 1 2 Change second footnote to See paragraph 1 24 and Figure 1 4 item not supplied with Option 050 Page 5 5 Paragraph 5 10 Change to Set power supply output voltage to zero and connect REMOTE connector center conductor to te
8. 1251 0135 CONNECTOR 80DY 15 PIN 1251 0135 OPTIONS 020 5 030 5040 0051 HOOD CONNECT OR 5040 0051 OPTIONS 020 amp 030 Table 6 3 Code List of Manufacturers MANUFACTURER NAME ADDRESS 00202 5 COMMON ANY SUPPLIER OF U S A 00773 AMP INC AIRCRAFT MARINE PROD HARRISBURG 17101 01121 ALLEN BRADLEY MILWAUKEE WIS 53204 02552 AMPHENOL CORP BROADVIEW ILL 60153 92735 SOLID STATE amp RECEIVING TUBE DIV SOMERVILLE N J 08876 04713 MOTORGLA SEMICONDUCTOR PROD INC PHOENIX ARIZ 85008 07263 FAIRCHILD CAMERA amp INST CORP SEMICONDUCTOR DIV MOUNTAIN VIEW CALIF 94040 13103 THERMALLOY CO DALLAS TEX 75247 24931 SPECIALTY CONNECTOR CQ INC INDIANAPOLIS IND 46227 26365 GRIES REPRODUCER CORP NEW ROCHELLE 10802 28480 HEWLETT PACKARD COMPANY PALO ALTO CALIF 94304 56283 SPRAGUE ELECTRIC CO N ADAMS MASS 01247 70903 CORP CHICAGO ILL 60644 71468 CANNON ELECT INC LOS ANGELES CALIF 90031 71785 CINCH MFG CO DIV INC ELK GROVE VILLAGE ILL 73734 FEJERAL SCREW PROO INC CHICAGO ILL 60618 T5915 LITTELFUSE INC OES PLAINES ILL 60016 76854 JAK MFG CO DIV OAK ELECTRO NETICS CORP CRYSTAL LAKE ILL 60014 77342 AMERICAN MACHINE amp FOUNORY CO POTTER BRUMFIELD DIV PRINCETON IND 47570 79727 CONTINENTAL WIRT ELECTRONICS CORP PHILADELPHIA 19144 79963 ZIERICK MFG CO MT KISCO 10549 80131 ELECTRONIC INOUSTR
9. 18 GHz 1 3 Typical Preselector Minimum Insertion 3 7 Spectrum Analyzer Tuning Curves Loss 25 C 1 2 and Responses 1 4 RF Interconnect Cable 1 46 3 8 Typical Yig Filter Passband at 1 8 GHz 2 1 Power Cable Line Connector Labels 2 2 10 MHz DIV Display 3 l Front Panel Controls Connectors and Indicators 3 2 3 9 Typical Yig Filter Passband at 4 GHz 3 2 Rear Panel Controls Connectors and Indicators 3 3 10 MHz DIV Display i 3 3 Option 020 Controls Connectorsand Indicators 3 4 3 10 Typical Yig Filter Passband at 4 GHz 3 4 Operational Adjustments Low Pass Filter 50 MHz DIV Display Operation 10 MHz to 1 8 GHz 3 6 4 1 Out of Band Rejection Test Setup il Model 8445A Page 3 8 3 10 3 11 3 12 3 12 3 12 4 3 Model 8445A LIST OF ILLUSTRATIONS cont d Figure Page Figure 4 2 Insertion Loss Test Setup DC 1 8 GHz 4 5 8 9 Pre Driver Assembly A1 Component Location 4 8 Insertion Loss Test Setup 1 8 18 GHz 4 7 8 10 Yig Pre Driver Assembly 1 4 4 Yig Filter Signal Compression Test Setup 49 Schematic Diagram 5 1 Power Supply Check and Adjustment Test Setup 5 1 8 11 Simplified Yig Driver Circuit 5 2 Pre Driver Check and Adjustment Test Setup 5 3 8 12 Simplified Temperature Compensation 5 3 Remote Amplifier Check and Adjustment Circuit X Test Setup 55 8 13 Drive Circuit with One Breakpoint 5 4 Yig Driver Check and Adjustment Test Setup 8 14 Yig Driver Assembly A3 Matched Operation
10. ADJUSTMENTS 5 10 Remote Amplifier Check and Adjustment 7 Adjust A2R23 NULL for zero indication on digital voltmeter 8 Common mode adjustment a Set power supply output voltage to 10 volts b Note error voltage indicated by voltmeter c Alternately adjust A2R20 and A2R21 for a zero indication on voltmeter Remove about half the error voltage with each potentiometer 9 Differential mode adjustment a Set power supply output voltage to zero b Connect REMOTE connector center conductor to terminal of power supply c Connect terminal of digital voltmeter to A2TP2 d Adjust A2R23 NULL for zero indication on voltmeter e Set Power Supply output voltage to 10 volts f Alternately adjust A2R20 and A2R21 for zero indication on voltmeter removing about half the error voltage with each potentiometer 10 Repeat steps 2 through 9 until settings are found which simultaneously satisfy all modes within a tolerance of 1 0 millivolts 11 Note and record digital voltmeter indication for each mode mV mV Common mode Differential mode 5 11 Yig Driver Adjustments Matched Operation REFERENCE Service Sheet 4 Note This procedure is used to match Preselector with a particular 8555A Spectrum Analyzer For Preselector operation with different Spectrum Analyzers perform adjustment procedure listed in paragraph 5 12 See paragraph 3 23 for improvement in Spectrum Analyzer adjustments prio
11. Ts i INTERCONNECT BOARD 5 Q 10K K R13 INPUT 141 SIGNAL GND po RM P O FROM i 10K xA PRE DRIVER I 35554 R9 OUTPUT I RF SECTION V gt 19 6 59 2 05 GHz NETWORK 1025MHz V 5 6 RIL RU RT gt 9 1 16 2K 750 8250 HLSK s QE lt 19 5v V ma hn i H eu 28 WyADIS5 I s POWER Eu 10K 550 MHz oo 1 dt t ks IF Wy 05 em Ed _ R32 NULL 23 4 isl 19 5V n OR AMPL DL 8250 723 6 r lt lt 23 be po s R19 E ik 10K R33 i 1210 ADJ4 2050 MHz IF Y I a 9V REFERENCE 2 N c12 1 E cw 01 10 R2 5 R26 81 14 19 41 5 2000 45 W3 i LOG C DECODERIRELAY DRIVERS 01 5 I K1 5 L 4 TP1 5 t NOTES 1 i 1 SEE SCHEMATIC DIAGRAM NOTES TABLE 8 3 a 2 SEE SECTION VII FOR IN 5 i R34 STRUMENTS HAVING SERIAL 16 rg CR NUMBERS 1129400120 amp BELOW 2 l 1 BAND CODE 2 4 151 ugeg CRD P Wy POWER GROUND 8555 E 4 l 5 pe BIT CRM 5 1854 0071 SIGNAL GROUND section lt gt re R4 5 6 ha CRIS 1 SERIAL PREFIX NO 1 129A 3 Figure 8 10 Yig Pre Driver Assembly A1 Schematic Diagram 8 15 SERVICE SHEET 4 THEORY OF OPERA
12. 3 9 At frequencies the FREQ OFFSET may be adjusted for maximum output level For wideband frequency tracking the FREQ OFFSET control should be adjusted at a frequency of approxi mately 2 GHz For narrow band tracking with minimum filter insertion loss the FREQ OFFSET control should be adjusted at the frequency of interest SIGNAL FREQUENCY GHz Note LOW PASS FILTER Measurement conditions for Figures 3 8 through 3 10 Analyzer bandwidth 300 kHz 10 dB log Preselector fixed tuneed to frequency indicated Input signal tuned LOCAL OSCILLATOR LO FREQUENCY through passband Responses tracked by Preselector 3 18 RECOMMENDED FREQUENCY Nul S eR ME DE RANGES n 5 and n 6 modes 3 19 Table 3 1 lists the recommended frequency ranges for operation of the Preselector with the Spectrum Analyzer Analyzer responses tracked Multiple responses without Preselector by the Preselector overlap at the edges of different frequency bands Note the intersection of the n 1 and n 3 responses at 4 1 GHz in Figure 3 7 Signals near the intersection points can appear in the passband of the Preselector from both mixing Figure 3 7 Spectrum Analyzer Tuning Curves modes and Responses Image responses without Preselector 3 11 Operation Model 8445A 210 MODE MAIN MODE Figure 3 8 Typical Yig Filter Passband Figure 3 10 Typical Yig Filter Passband at 1 8 GHz 10 MHz DIV Display at 4 GHz 50 MHz DIV Displav 3 20 YIG FILTER
13. etc voltage regulator cable socket crystal tuned cavity network rack mount only root mean square reverse working voltage slow blow screw selenium section s semiconductor silicon silver slide spring special Stainless steel split ring steel tantalum time delay toggle thread titanium tolerance trimmer traveling wave tube micro 10 6 variable dc working volts with watts working inverse voltage wirewound without 6 1 Replaceable Parts Model 8445A Table 6 2 Replaceable Parts Reference HP part Number Qty Description Mfr Part Number Designation AL 08445 60001 BOARD ASSY PRE DRIVER 08445 60001 0160 2055 C FXD CER 0 01 UF 80 20 100VDCW 023 101 1032522 0 1 2 0160 2055 C FXD CER 0 01 UF 80 20 100VDCW C023F101F1032522 CDH ALCRL 1902 0025 DIODE BREAKOQWN 10 0V 5 400 MW 1902 0025 ALCR2 1901 0025 DIOOE SILICON 100 1 FD 2387 ALCR3 1901 0025 OLODE SILICON 100 1 FO 2387 ALCRG 1901 0025 DIODE SILICON 100 1 2387 ALCR5 1902 0025 DIODE BREAKDONN 10 0V 5 400 MW 1902 0025 ALCRO 1901 0025 DIODE SILICON 100 1 FD 2387 ALCRT 1901 0025 DIOOE SILICON 100 1 FD 2387 ALCKB 1902 0041 DIODE BREAKDOWN 5 11 5 5710939 98 1 9 1902 0041 0100 5 11 55 5210939 98 ALCRLO 1902 0025 DIODE BREAKDOWN 10 0V 5 400 MW 1902 0025 ALlCRAL 1901 0025 OIOOE SILICON 100MA 1V FD 2387 1 12 1901 0025 OIODE SILICON 100
14. 1 8 to 18 GHz 1 of 2 3 8 Model 8445A Operation OPERATIONAL ADJUSTMENTS Check that the 115 230V switch is set to correspond with the available line voltage Refer to Figure 3 2 steps 4 5 and 6 for switch and fuse information Connect interconnect cable between AUX B output on Spectrum Analyzer Display Section and TUNING CONTROL SPECTRUM ANALYZER input on Preselector Connect Preselector and Spectrum Analyzer to line voltage source and apply power Perform Spectrum Analyzer Operational Adjust ments Figure 3 3 in Spectrum Analyzer RF Section 8555A Operating and Service Manual Connect rigid coaxial cable between lower FILTER PORT on Preselector and RF Section INPUT Set LOG REF LEVEL to 0 dBm Set SCAN WIDTH PER DIVISION to 10 MHz Connect a 30 dBm 2 0 GHz signal to upper FILTER PORT on Preselector Select n 1 Frequency BAND and tune Analyzer FREQUENCY control to center the 2 0 GHz signal on CRT display Reduce SCAN WIDTH PER DIVISION to 0 5 MHz keeping signal centered on display with FRE QUENCY control Reduce SCAN WIDTH PER DIVISION to 100 kHz center signal on display with FINE TUNE control Set LOG LINEAR switch to LINEAR and LINEAR SENSITIVITY control to 1 mV DIV Adjust Preselector FREQ OFFSET control to center Yig filter passband on the 2 GHz signal Center indicated bv slight dip between two signal peaks See Figure 3 8 Set Analyzer LOG LINEAR contr
15. 210 MODE 3 21 The 210 mode is illustrated in Figure 3 10 The passband of the 210 mode is approximately 10 MHz wide with an amplitude approximately 20 dB below the main tuning mode The 210 mode tracks with the main tuning mode at a frequency approxi mately 240 MHz below the main mode 3 22 PRESELECTOR TRACKING WITH SPECTRUM ANALYZER 3 23 The Preselector Yig driver is adjusted during the final factory checkout for linear tracking with a linear input voltage The upper frequency break points are set by applying an exact voltage and tuning the bandpass to a fixed frequency This procedure provides optimum tracking for Preselec tor operation with any 8555A Spectrum Analyzer Figure 3 9 Typical Yig Filter Passband System Some improvement can be made in Pre at 4 GHz 10 MHz DIV Display selector on n 3 and n 4 bands by matching the Table 3 1 Recommended Frequency Ranges and Mixing Modes Analyzer Scan Time lt 10 ms DIV Signal Recommended Analyzer Analyzer Frequency GHz Harmonic Freq Range GHz IF Freq MHz 0 01 2 05 1 50 3 55 2 60 4 65 2 07 6 15 4 13 6 15 4 13 10 25 6 17 10 25 6 19 14 35 8 23 14 35 10 29 18 00 1 o O t to w 0o 00 Co t0 CO NT 60 O O 0 o 2 2 4 4 6 7 9 1 3 12 Model 8445A Preselector to a particular Spectrum Analyzer RF Section
16. 231 6101 TWX 910 867 4723 PERU Compa ia Electro Medica S A Ave Enrique Canaual 312 San tsidro Casitla 1030 tima Tel 22 3900 Cable ELMED Lima PUERTO RICO San Juan Electronics Inc Box 157 Ponce de Lean 154 Pda 3 PTA de Tierra San juan 00906 Tel 809 725 3342 722 3342 Cable SATRON CS San Juan Telex SATRON 3450 332 SURINAME Surte Radio Holland Box 155 Paramaribo Tel 72118 Cabie Treurniet Paramaribo ONTARIO Hewlett Packard Canada Ltd 880 Lady Ellen Place Ottawa 3 Tet 613 722 4223 TWX 610 562 1952 Hewlett Packard Canada Ltd 50 Galaxy Bivd Rexdale Tel 416 677 9611 510 492 4246 P O Box 22813 5300 Westpark Orive Suite 100 Houstan 77027 Tel 713 781 5000 TWX 910 681 2645 231 Billy Mitchell Road San Antonie 78225 Tel 5122 434 4171 TWX 910 871 1170 2890 South Main Street Salt Lake City 84115 Tel 801 487 0715 910 925 5681 VERMONT P O Box 2287 Kennedy Orive South Burlington 05401 Tel 802 658 4455 TWX 510 299 0025 VIRGINIA 6514 2111 Spencer Road Richmond 23230 Tel 703 285 3431 TWX 710 956 0157 WASHINGTON 433 108th Bellevue 98004 Tel 206 454 3971 TWX 910 443 2303 WEST VIRGINIA Charleston Tel 304 768 1232 FOR U S AREAS NOT LISTED Contact the regional office near est you Atlanta Georgia North Hollywood California Paramus New
17. 3 inch clearance from o Line Input Fuse Rating of fuse to be used is marked surrounding objects LINE input module 115 230V 10 48 66 Hertz 100VA max Line Input Connects to external ac power supply 115 230V Switch Line voltage slide switch controls power supply input connections Check that switch is set for nominal voltage of ac line To change setting remove power cord from Line Input 3 slide pro tective cover aside extract fuse with FUSE PULL 5 and slide switch to desired position Replace fuse with a fuse of the value indicated for the desired switch position Fuse extractor and switch lock Prevents line switch from being actuated until fuse is extracted near line voltage slide switch setting corresponding to nominal ac supply voltage TUNING CONTROL REMOTE Input for remote tuning voltage to Yig filter Enabled when Spectrum Analyzer is not operating power off when intercon nect cable is disconnected or on Options 020 030 when the mode switch is set to REMOTE Type BNC connector Yig filter frequency to voltage ratio 1 0 GHz Volt TUNING CONTROL SPECTRUM ANALYZER Input Input control voltage for selection of Yig or low pass filter Yig tuning voltage and band code information Disconnect input cable when using REMOTE input to tune Yig filter Figure 3 2 Rear Panel Controls Connectors and Indicators Operation Model 8445A OPTION 020 04454 AUTOMATIC PRESELECTOR ETT
18. BEULSTAR INDONESIA Bolon Trading NY Dialah Merdeka 29 Bandung 4915 51560 Cable ILMU Telex 08 809 IRAN Telecom Ltd P O Box 1812 240 Kh Saba Shomat Teheran Tel 43850 48111 Cable BASCOM Teheran ISRAEL Electronics amp Engineering Oly of Motorola Israel tto 17 Aminadav Street Tel Aviv Tel 36941 3 lines Cable BASTEL Tel Aviv Telex Bastel TY 033 569 JAPAN Yokogawa Packard Ltd Ohashi Building 49 1 Yoyor Shibuya ku Tokyo Tei 053702281 7 Telex 2322024116 Cable 23 724 NETHERLANDS Hewletl Packatd Benelux Weerdeslein 117 P O Box 7825 Amsterdam Z 11 Tel 020 42 77 77 Cable PALOBEN Amsterdam Telex 13 216 NORWAY Hewlett Packard Norge 5 Box 149 Nesveien 13 N 1344 Haslum fel 02553 60 Cable HEWPACK Oslo leiex 16621 PORTUGAL Telectra Empiesa Tecnica de Equipamentas Liecteicas Saa ra Rua Rodrigo da Fonseca 103 Box 2531 Lisbon 1 Tel 68 60 72 Cable TELECTRA Lisbon Telex 1598 SPAIN Ingemeros SA Enrique Larreta 12 Madrid 16 Tel 215 35 43 Cable TELEATAIO Madrid Telex 27249 ingenieros SA Ganduxer 76 Barcelona 6 Tel 211 44 66 Cable TELEATAIO Barcelona AUSTRALIA Yokogawa Hewlett Packard Ltd Nisei Bldg 2 28 Kasuga IbarageShi Osaka Tel 0726 23 1641 Telex 385 5322 Yokogewa Hewleit Puckard Mo Buil
19. D See Item 6 below See paragraph 8 30 for Operational Amplifier troubleshooting procedure If voltages are out of tolerance see paragraph 5 9 for adjustment procedure SWEEP SENSE AND YIG FILTER HYSTERESIS RESET AMPLIFIERS Troubleshoot the sweep sense and Yig filter hysteresis reset amplifiers using an oscilloscope and test conditions listed below a Set Spectrum Analyzer controls as follows BAND 4 5 n 1 2 05 GHz IF an y w Wi w S saad es 5 1 GHz NO 300 kHz SCAN WIDTH PER DIVISION 200 MHz SCAN TIME PER DIVISION 10 MILLISECONDS SGAN MODE as INT SCAN TRIGGER XA RT LINE b Set Oscilloscope controls as follows INP a d Ced e Re RC ee s Sre s 5 DC Coupled 20 MSEC SWERP MODE 6k y oi oe v a m NORM 9o wl go MALUS EXT VOLIS DIY 5 c Connect SCAN IN OUT on analyzer to external trigger input on oscilloscope d Connect oscilloscope probes to A1TP1 and A1U5 pin 6 and compare with typical waveforms given below e If normal connect oscilloscope probes to 1 and 1 5 Compare with typical waveforms below f If abnormal switch analyzer to FULL scan mode and repeat steps d and e above g See paragraph 8 30 for operational amplifier troubleshooting procedure Pre Driver Assembly SERVICE SHEE
20. FINE Option 020 030 instruments Fine tune control for Yig filter frequency in manual operating mode 9 MODE Option 020 030 instruments Selects Pre selector mode of operation MANUAL Yig filter tuned by front panel controls AUTO Low pass filter and or Yig filter selected by control signals from analyzer RF Section Yig frequency tuned by signal from RF Section REMOTE filter tuned by input voltage to BNC connector on rear panel LOW PASS Selects 1 8 GHz low pass filter Inhibits Spectrum Analyzer control of Preselector FILTER PORTS Input and output connectors Either port may be used for RF input or output Standard installation configuration utilizes lower port as output port Rigid coaxial cable supplied to con nect lower port to analyzer INPUT connector Type N coaxial connectors normally provided Option 001 instruments supplied with APC 7 connectors See Table 1 4 for optional rigid coaxial interconnect cables Figure 3 3 Option 020 Controls Connectors and Indicators 2 of 2 3 5 Operation Model 8445A OPERATIONAL ADJUSTMENTS Figure 3 4 Operational Adjustments Low Pass Filter Operation 10 MHz to 1 8 GHz 1 of 2 3 6 8445A 10 11 12 Operation OPERATIONAL ADJUSTMENTS Check that the 115 230V switch is set to correspond with the available line voltage Refer to Figure 3 2 steps 4 5 and 6 for switch and fuse information Connect interconnect cable
21. I 5 7 Component Location 5 5 Yig Driver Check and Adjustment Test Setup 8 15 Yig Driver Assembly A3 Linear Operation 5 10 Schematic Diagram 8 1 Transistor Operation 8 16 Filter Port Connector Exploded View 8 2 Examples of Diode and Transistor Marking 85 8 17 Power Supply Assembly A2 Methods 8 6 Component Location 8 3 Operation Amplifier Equivalent Circuit 8 7 8 18 Yig Driver Assembly A3 8 4 8445 Preselector Top Internal View 8 9 Component Location 8 4b 8445A Option 020 Preselector Top Internal 8 19 Remote and Manual Control Amplifier ad View 8 9 Switching Circuits Schematic Diagram 8 5 Adjustment and Test Point Locations 8 9 8 20 Power Supply Assembly A2 8 6 Preselector Block Diagram 8 11 Component Location 8 7 Preselector Troubleshooting Block Disiram 8 13 8 21 Power Supply Assembly A2 8 8 Hysteresis Reset Circuit Waveforms 8 14 Schematic Diagram LIST OF TABLES Table Page Table 1 1 8445A Specifications 1 2 5 1 Check and Adjustment Test Card po 1 2 Accessories Supplied T 1 3 6 1 Abbreviations and Designators used in Parts List 1 3 Test Equipment and Accessories 14 6 2 Replaceable Parts 5 1 4 Optional RF Interconnect Cables 1 6 6 3 Code List of Manufacturers 3 1 Recommended Frequency Ranges and 8 1 Factory Selected Components Mixing Modes 3 12 8 2 Adjustable Components 8 3 Schematic Diagram Notes 4 1 Performance Test Card 4 11 8 4 Etched Circuit Soldering Equipmen
22. Jersey Skokie illinois Their complete ad dresses are listed above Service Only URUGUAY Pablo Ferrando S A Comercial e industrial Avenida Italia 2877 Casilla de Correo 370 Montevideo Tel 40 3102 Cable RADIUM Montevideo VENEZUELA Hewlett Packard De Venezuela Apartade 50933 Caracas Tel 71 88 05 71 88 69 71 99 30 Cable HEWPACK Caracas Teiex 39521146 FOR AREAS NOT LISTED CONTACT Hewlett Packard INTERCONTINENTAL 3200 Hillview Ave Pala Alto California 94304 Tel 415 493 1501 TWX 910 373 1267 Cabie HEWPACK Palo Alto Telex 034 8461 QUEBEC Hewlett Packard Canada itd 275 Hymus Boulevard Pointe Claire Tel 514 597 4232 TWX 610 422 3022 Telex 01 20607 FOR CANADIAN AREAS LISTED Contact Hewlett Packard Can ada Ltd in Pointe Claire at the complete address listed above AUSTRIA Unilabor GmbH Wissenschaftliche Instrumente Rummelhardtgasse 6 Box 33 A 1095 Vienna Tei 222 42 61 81 43 13 94 Cable LABORINSTRUMENT Vienna Telex 75 762 BELGIUM Hewlett Packard S A Benelux 348 Boulevard du Souverain 8 1160 Brussels Tei 02 222240 Cable PALOB N Brussels 23 494 DENMARK Hewlett Packard A S Datave 38 QK 3460 Birkerod Tel 01 81 66 40 Cable HEWPACK AS Telex 66 40 Hewlett Packard A S Torvet 9 DK B600 Silkeborg Tel 06 82 71 66 FINLAND Hewlett Packard Oy Bulevardi 26 Box 12185 H
23. Louis 63144 Tet i314 962 5000 TWX 910 760 1670 NEW JERSEY W 120 Century Road Paramus 07652 Tet 201 265 5000 TWX 710 990 4951 1060 Kings Highway Cherry Hill 08034 Tel 509 667 1000 TWX 710 892 2945 NEW MEXICO Scx 8356 Station 6501 Lomas Boulevard Albuquerque 37108 Tei 505 265 3713 TWX 310 589 1665 156 Wyatt Drive Las Cruces 88001 Tel 505 526 2485 TWX 910 983 0550 NEW YORK 1702 Central Avenue Albany 12205 Tet 518 863 8462 TWX 710 441 8270 1213 Campvilie Road Endicott 13760 Tel 607 754 0050 TWX 510 252 0890 82 Washington Street Poughkeepsie 12501 Tet 914 454 7330 TWX 510 248 0012 39 Saginaw Drive Rochester 14623 1716 473 9500 510 253 5981 5854 East Molloy Road Syracuse 13211 Tei 315 454 2486 TWX 710 541 0482 1 Crossways Park West Woodbury 11797 Tel 516 921 0300 TWX 510 223 0811 NORTH CAROLINA P O Box 5188 1923 North Main Street Migh Point 27262 Tel 919 885 8101 510 926 1516 CENTRAL AND SOUTH AMERICA ECUADOR Laboratorios de Radio ingenieria Calle Guayaquil 1246 Post Office Box 3199 Quito Tel 212 496 219 185 Cable HORVATH Quito EL SALVADOR Electr nica Apartado Postai 1583 Blvd Venezuela 1231 San Satvador Tel 217527 214895 Cable ELECTRONICA San Saivador 4 MEXiCO Hewlett Packard Mexicana 5 A de c v 622 Adoifo Prieto Col dei Valle Mexico 12 D F Te
24. RIGID STANDARD SEE TABLE 1 5 FOR ALTERNATE introduction to this section for ordering information 5040 0306 08555 20093 08555 20094 080 080 08761 2027 28JR 128 1 5040 0702 DBD 9002 720 SPEC OCMLTW5P 0 53740 5001 053018 08445 60011 08445 60011 1490 0030 3150 0224 5000 0050 5000 0731 5020 0900 5020 0901 5060 0730 5060 0767 08443 40001 08443 40002 08445 00007 08445 00008 08445 00014 08445 00015 08445 00016 08445 00017 08445 00018 08445 00019 08445 00020 08445 00021 08445 00009 08445 00002 5060 0216 5060 0774 00 505 5040 0327 2100 3105 08445 20004 2100 3105 0757 0459 2100 3128 08445 00004 2100 3128 08445 00005 53 61280 121 A1H 3100 3016 08445 00006 08445 00010 9100 3144 SPEC A1 G Al 08445 20022 Model 8445A Replaceable Parts Table 6 2 Replaceable Parts Reference HP part Number Qty Description Mfr Part Number Designation 8120 1348 CABLE ASSY POWER DETACHABLE KHS TO41 SEE FIGURE 2 1 FOR ALTERNATE 08445 60007 CABLE ASSY INTERCONNECT 08445 60007 08445 20006 CABLE ASSY RF COAXIAL 08445 20006 DELETE FOR OPTIONS 010 amp 0301 08445 20006 CABLE ASSY RF COAXIAL 08445 20006 DELETE FOR OPTIONS 010 amp 030 08445 20007 CABLE ASSY RF COAXIAL 08445 20007 DELETE FOR OPTIONS 010 amp 030 08445 20008 CABLE ASSY RF COAXIAL 08445 20008 DELETE FOR OPTIONS 010 amp 030 08445 60013 CONNECT OR JUMPER 08445 60013 DELETE FOR OPTIONS 020 030
25. Table 5 1 Check and Adjustment Test Card Hewlett Packard Model 8445 Preselector 8445 8555 8552 140 Instrument s Serial No Para No Test Description Power Supplies Check and Adjustment 19 5 Vdc supply 23 Vdc supply 40 Vdc supply Unregulated supply voltage level determined by load and line voltage Pre Driver Check and Adjustment A1R8 NULL ADJ 1 A1R23 NULL ADJ 2 A1R31 NULL ADJ 3 A1R26 ADJ 4 2050 MHz IF n 2 A1R28 ADJ5 550 MHz IF 1 Check n 1 Set BAND to 1 151 to and A381 to TEST Adjust FREQUENCY for 3 000 at 1 Check level at A1TP3 for following BANDS n 1 n 2 n 2 n 3 n 3 n 4 n 4 Remote Amplifier Check and Adjustment Common mode Differential mode Test Performed by Date Measurement Min Actual Max Unit Adjustments Model 8445 Table 5 1 Check and Adjustment Test Card cont d Test Description T R i Actual Max Yig Driver Check and Adjustment Matched Operation NULL ADJ FREQ OFFSET R1 2 GHz TRACKING R2 8 GHz Breakpoint A3R29 12 5 GHz Breakpoint A3R24 15 5 GHz Breakpoint A3R21 18 0 GHz Yig Driver Check and Adjustment Linear Operation FREQ OFFSET Agj TRACKING Adj A3R29 Adj A3R24 Adj 21 Adj 5 14 Model 8445A 6 1 INTRODUCTION SECTION VI REPLACEABLE PARTS 6 2 Table 6 1 is an index of reference designations and abbreviations used manuals in Hewl
26. between AUX B output on Spectrum Analyzer Display Section and TUNING CONTROL SPECTRUM ANALYZER input on Preselector Connect Preselector and Spectrum Analyzer to line voltage source and apply power Perform Spectrum Analyzer Operational Adjust ments Figure 3 3 in Spectrum Analyzer RF Section 8555A Operating and Service Manual Note Automatic Preselector Options 010 030 do not have low pass filter installed see Figure 3 5 Set analyzer LOG LINEAR switch to LINEAR and rotate LOG REF LEVEL control until 1 mV DIV is matched with the lighted index lamp Connect Analyzer CAL OUTPUT to upper filter port of Preselector Connect rigid coaxial cable between FILTER PORT and Analyzer INPUT Note and record low pass filter insertion loss at 30 MHz From the LIN 7 to 5 line equals approximately 3 dB Low pass filter insertion loss should be 1 dB Remove rigid coaxial cable connecting Preselector FILTER PORT to Analyzer INPUT Set Analyzer INPUT ATTENUATION to 40 dB Set Analyzer LOG LINEAR control to LOG Rotate LOG REF LEVEL control to 10 dBm 13 14 15 16 17 18 19 20 21 22 23 24 25 26 Set SCAN WIDTH PER DIVISION to 10 MHz and set FREQUENCY control to position cursor at 1 5 GHz on Frequency Scale With INPUT ATTENUATION at 40 dB connect Analyzer SECOND LO OUTPUT to INPUT Center 1 5 GHz LO signal on CRT display Reduce SCAN WIDTH PER DIVIS
27. gives the characteristics of each When examining a tran sistor stage first determine if the emitter base junction is biased for conduction forward biased by measuring the voltage difference between emit ter and base When using an electronic voltmeter do not measure directly between emitter and base there may be sufficient loop current between the voltmeter leads to damage the transistor Instead measure each voltage separately with respect to a common point e g chassis If the emitter base junction is forward biased check for amplifier action by short circuiting base to emitter while observing collector voltage The short circuit elimi nates base emitter bias and should cause the tran sistor to stop conducting cut off Collector volt age should then change and approach the supply voltage Any difference is due to leakage current through the transistor and in general the smaller this current the better the transistor If the collec tor voltage does not change the transistor has either an emitter collector short circuit or emitter base open circuit 8 27 Transistor and Diode Markings Figure 8 2 illustrates examples of diode and transistor mark Amplifier Characteristics COMMON COMMON EMITTER COLLECTOR 5002 1500 20Ka 500Ko CHARACTERISTIC COMMON Input Impedance 302 502 Output 300KQ 500 30KQ SOKN 502 10002 Voltage Ga
28. i i 1 1 I 1 1 1 1 I I I 52 BOARD AS Wa 1 1826 0013 o 2 R19 464K REMOTE CONTROL BUFFER AMPL RESISTOR ARRAY R22 I I REMOTE OUTPUT ee eg oe lt 1 PRE DRIVER OUTPUT 2 4 NOTES L SEE TABLE 8 3 20V FROM COARSE TUNE CONTROL FOR OPTIONS 020 amp 030 19 5V JUMPER BETWEEN A5P1 14 AND ASP1 2 EXCEPT FOR OPTIONS TOP VIEW 1 020 amp 030 AUTOMATIC JUMPER FROM RY3TO DRIVER REFERENCE DESIGNATIONS WITHIN OUTLINED XA5 PIN CONTROL EXCEPT FOR OPTIONS 020 amp 030 ASSEMBLIES ARE ABBREVIATED FULL DESIGNATION iN w POWER GROUND CLUDES ASSEMBLY NUMBER e g OF ASSEMBLY Al 1 AIRI DESIGNATIONS OF OTHER COMPONENTS ARE 1 1 COMPLETE AS SHOWN SERIAL PREFIX THA i SIGNAL REFERENCE m GROUND Figure 8 19 Remote and Manual Control Amplifier and Switching Circuits Schematic Diagram aw R 19 SERVICE SHEET 6 THEORY OF OPERATION POWER SUPPLY ASSEMBLY A2 Service Sheet 6 contains the schematic diagram for the 40 19 5 and 23 volt power supplies The service sheet also contains the schematic and wiring diagrams for the power transformer power line module and switching circuits Power transformer T1 provides 27 7 V RMS at 1 5 Amp and 27 7 V
29. i m YIG e o 1 1 Sahak v IF OFFSET SUPPLY DRIVER AM MAS 1 XA3 19 5V R18 6 19 5 18 11 H 6 QO nv si a I 3 I Qe 1 SUMMING 54 1 3 6 POWER GROUND P 3 SIGNAL GROUND R R2 1 909 I ap kira YIG DRIVER 10 V 4 7 CR9 14 7V 38 3K R 215 274 GE Yu R26 R27 61 9K 61 9K I BENE 1 PE 21 5K TEMPERATURE COMPENSATION 1 x I I md idis pert 4 2 54 RI 100 REFERENCE DESIGNATORS FREQ OFFSET R2 Pd NJ s2 12 235 R1 2 R2 18 R21 30 TRACKING en hi EX 5 1K 2 02 4 TP1 2 3 4 NOTES oe A ee et Nl TO 7 COMMON SIGNAL AND POWER GROUND POINT REFERENCE DESIGNATIONS WITHIN OUTLINED ASSEMBLIES ARE ABBREVIATED FULL DESIGNATION IN 1 SEE SCHEMATIC DIAGRAM NOTES TABLE 8 3 4 SERIAL PREFIX NO 1119A CLUDES ASSEMBLY NUMBER eg OF ASSEMBLY Al 15 AIRI DESIGNATIONS OF OTHER COMPONENTS ARE COMPLETE aS SHOWN Figure 8 14 Yig Driver Assembly A3 Component Location Figure 8 15 Yig Driver Circuits Schematic Diagram SERVICE SHEET 4 8 17 SERVICE SHEET 5 THEORY OF OPERATION Service Sheet 5 contains the schematic diagram for the coaxial switch drive manual control
30. lowpass filter is deleted standard instrument contains the 0 to 1 8 GHz lowpass filter the Yig filter with type N RF input 1 13 The Model 8445A Option 020 Automatic and output connectors Preselector is the same as the standard Preselector with front panel controls added for manual opera 1 11 The Model 8445A Option 001 Automatic tion Preselector contains type APC 7 RF input and output connectors Option 001 instruments may 1 14 The Model 8445A Option 030 Automatic be combined with other instrument options to Preselector is the same as Option 020 without the form the desired configuration 1 8 GHz lowpass filter 1 2 Model 8445A 1 15 MODIFICATIONS REQUIRED 1 16 HP Model 140T Display Sections serials prefixed 1105A and below HP Model 141T Dis play Sections serials prefixed 1047A and below all HP Model 1415 1405 Display Sections and all HP Model 140 series Oscilloscope Mainframes re quire modification for Preselector compatibility The modification consists of adding a cable assem bly to the Display Section This cable connects between the Auxiliary output connector on the rear panel of the 8555A RF Section and the rear panel of the Display Section Modification kit HP Part Number 00140 69505 required for 140T Display Sections serials prefixed 1105A and below 141T Display Sections serials prefixed 1047A and below and 140S 141S Option TG 1 Display Sections Modification Kit HP Part Num ber 00
31. responses The Preselector is a fixed frequency lowpass filter over the 0 to 1 8 GHz frequency range and a voltage tuned filter using a Yig yttrium iron garnet crystal as a resonant tuning circuit in the RF signal path over the frequency range of 1 8 to 18 GHz When used with the 8555A Spectrum Analyzer the Yig filter is a swept selective filter that tracks the frequency of the analyzer s re sponse as the analyzer sweeps across its selected range The Yig filter is electronically tuned by sweep voltage and band code signals from the analyzer In addition to its primary function as a Preselector the Yig filter may be used as a man ually or electronically tuned bandpass filter The Yig filter may be tuned by external sweep voltage or manually tuned by front panel controls 1 1 General Information Model 8445A Table 1 1 8445A Specifications Frequency Range DC 1 8 GHz Low Pass Filter 1 8 Tracking Errors At any particular frequency residual 18 GHz Tracking Filter tracking error can be completely eliminated by front panel adjustments Tracking Filter 3 dB Bandwidth Typically 30 45 MHz 8555A Local Oscillator Emission with Preselec Tracking Filter Skirt Roll off Characterisitics of a two tor Typically lt 50 dBm over recommended oper pole filter ating ranges with Spectrum Analyzer input attenu ator set to 0 dB See Table 3 1 Recommended Insertion Loss Frequency Ranges and Mixing Modes Insertion Lo
32. theory of operation text by block numbers 8 5 RECOMMENDED TEST EQUIPMENT 8 6 Test equipment and accessories required to maintain the Preselector are listed in Table 1 3 If the equipment listed is not available equipment that meets the required specifications may be substituted 8 7 TROUBLESHOOTING 8 8 Troubleshooting procedures are divided into two maintenance levels in this manual The first a troubleshooting tree is designed to isolate the cause of a malfunction to a circuit or assembly In this procedure maximum use is made of the front panel controls indicators and the instrument s operating capability to isolate the malfunction to the defective circuit 8 9 The second maintenance level provides circuit analysis and test procedures to aid in isolating faults to a defective component Circuit descrip tions and test procedures for the second main tenance level are located on the pages facing the schematic diagrams The test procedures are refer enced to the schematic diagrams by block num bers 8 10 After the cause of a malfunction has been found and remedied in any circuit containing adjustable components the applicable procedure specified in Section V of this manual should be performed After repairs and or adjustments have been made the applicable procedure specified in Section IV of this manual should be performed 8 11 REPAIR 8 12 Factory Repaired Exchange Modules Factory repaired exchange modul
33. to 10 dBm Power Supply Output Voltage Variable 0 20 Vdc HP 6205B Power Supply Dual DC Output Current 0 300 mA Meter Accuracy 3 Control Fine adjustment DC Volt Ohm Voltmeter Ammeter Voltage Range 1 mV 300 V Accuracy 1 Input Resistance 10 megohms Ammeter Current Range 14A 1A Accuracy 2 Ohmmeter Resistance range 1 ohm 100 megohm Accuracy 5 reading at center scale HP 412A Volt Ohm Ammeter A Adjustments T Troubleshooting P Performance 1 4 Model 8445A General Information Table 1 3 Test Equipment and Accessories 2 of 2 Minimum Specifications Suggested Model Frequency Range 0 01 18 GHz Frequency Response lt 2 0 dB Spectrum Analyzer HP 8555A Spectrum Analyzer with HP 8552 IF Section and HP 141T Display Section AC Voltmeter HP 410C Multifunction Voltmeter Voltage Accuracy 3 of full scale Voltage Range 300 V full scale Input Impedance 10 megohms Variable Voltage Transformer Voltage Range 102 127 Vac General Radio W5MT3A or Superior Electric UC1M Coaxial Cable Male BNC Connectors 44 inches long with alligator clips HP 10501A Cable Assy w alligator clips Frequency Meter Frequency Range 2 18 GHz Overall Accuracy 0 2 HP 536A 537A P532A Frequency Meters Swept Frequency Indicator Sensitivity 5 dB div Blan
34. to the transistor increases The coil current increases until the current through R6 exactly balances the currents through R3 and R4 Circuit values are chosen to give the desired coil current input voltage characteristic TRACKING control R2 is provided to make minor adjustment to this relationship FREQ OFFSET control R1 is provided as an adjustment to correct for the offset due to residual magnetism in the core structure a Temperature Compensation As the temperature of the Yig filter rises the resonant frequency tends to decrease at a rate of approximately 3 MHz C An increase in temperature decreases the resistance of thermistor 1 This causes the voltage at the junction of R16 and R17 which is fed to the inverting operational amplifier U1 through R13 to go more negative The amplifier output then goes positive which raises the Yig frequency compensating for the drop caused by increasing temperature A simplified diagram of the temperature compensation circuit is given in Figure 8 12 At 25 C this circuit gives some offset current This offset is removed by the offset compensation circuit leaving only the changes from 25 C to be corrected by the temperature compensation circuit b Linearity Correction Breakpoints In practice the Yig coil does not exhibit a linear current frequency characteristic the iron core tends to saturate at the higher frequencies To correct for the non linear tuning curve compensating breakpoints are
35. 0 1514 0360 1514 0360 1514 0360 1514 1826 0013 08445 60014 08445 60015 08445 60016 08445 60017 08445 60009 0698 3453 08445 20009 1251 1886 1251 1886 1251 1886 1251 1115 5060 1189 0160 3043 9140 0114 3160 0209 0160 3451 0160 3451 2110 0001 2110 0012 0960 0159 1250 0914 1250 0915 5040 0306 08555 20093 08555 20094 2190 0104 2950 0132 08761 2027 1250 0909 1250 0816 5040 0306 08555 20093 08555 20094 2190 0104 2950 0132 08761 2027 1250 0909 1250 0816 Table 6 2 Replaceable Parts Description NOT ASSIGNED Ri VAR WW 20K OHM 5 TYPE H iW R FXD MET 51 1K OHM 1 1 8W R FXD FLM 61 9K OHM 1 1 80 R VAR 20K OHM 5 TYPE H 14 R FXO FLM 51 1K OHM 1 1 80 RiFXD FLM 61 9K OHM 1 1 84 R FXD FLM 61 9K OHM 1 1 8W R FXD MET FLM 51 1K OHM 14 1 8W R VAR WW 20K OHM 5 TYPE H lw R FXD FLM 100 OHM 14 1 8W SWITCH SLIOE MINIATURE SPDT BOARD BLANK PC TERMINAL PIN SQUARE TERMINAL PIN SQUARE TERMINAL PIN SQUARE TERMINAL PIN SQUARE IC LINEAR YIG FILTER ASSY NOT RECOMMENDED FOR FIELD REPAIR SELECT FROM REBUILT OR REPLACEMENT ASSY4S LISTED BELOW YIG FILTER REPLACEMENT ASSY STD AND OPT 020 INSTRUMENTS INCLUDES CALIBRATIGN LABEL REBUILT 08445 60014 YIG FILTER ASSY INCLUDES CALIBRATION LABEL YIG FILTER REPLACEMENT ASSY OPTIONS 010 AND 030 INCLUDES CALIBRATION LABEL REBUILT 08445 60016 YIG FILTER ASSY INCLUDES CALIBRATION L
36. 0012 FUSE 0 5 AMP 250V A2F2 2110 0027 FUSE 0 125A 250V A2MP 1 1205 0011 HEAT DISSIPATOR FOR TO 5 AND TO 9 CASES A2MP 1 0340 0162 INSULATOR TSTR FOR TO 66 A2MP2 2110 0269 CLIP FUSE 0 250 DIA A2Q1 1854 0072 TSTR SI NPN A2Q2 1854 0022 TSTR SI NPN A2Q3 1853 0012 TSTR SI PNP 29 1853 0012 5 8 51 PNP 295 1854 0022 TSTR SI NPN A2Q6 1854 0022 TSTR SI NPN A2QT 1853 0012 TSTR SI PNP A2Q8 1853 0012 TSTR SI PNP A209 1854 0039 TSTR SI NPN 2010 1853 0020 TSTR SI PNP SELECTED FROM 2N3702 A2R1 0757 0279 R FXD FLM 3 16K OHM 1 1 8W A2R2 0757 0439 R FXD MET FLM 6 81K OHM 1 1 8W A2K3 0683 0275 R FXD COMP 2 7 OHM 5 1 4W A2R 0698 3136 R FXD MET FLM 17 8K OHM 1 1 8W A2R5 2100 1774 R VAR WW 2K OHM 5 TYPE H 14 A2R6 0757 0442 R FXO FLM 10 0K OHM 1 1 8 9757 0458 R FXD FLM 51 1K OHM 1 1 8wW AZRB 0698 3136 R FXD MET FLM 17 8K OHM 1 1 8W See introduction to this section for ordering information Repiaceable Parts Mfr Part Number 0757 0465 0757 0280 0757 0280 0757 0465 0757 0465 1055 0757 0442 0757 0465 0757 0438 0757 0458 0757 0199 0757 0465 0757 0443 GF124 0008 08445 20001 0360 1514 0360 1514 0360 1514 0360 1514 0360 1514 1826 0013 1826 0013 1826 0013 1826 0013 1826 0013 08445 60003 3601326050 2 008 0180 1819 C157B251F101K 25 CDH C023F 101H203MS22CDH C023F101F1032522 CDH 1N4998 1N4998 1N4998 1N4998 SR1358 4 SR1358 4 5 1358 4 SR1358 4 1902 325
37. 009 252 15 30 340 252 15 30 340 252 15 30 340 456 99 99 193 5060 1189 29C147A CDH 9140 0114 8500 C0238101F10328525 COH C023B 101F 1032525 COH 312001 312 500 0960 0159 131 150 131 149 5040 0306 08555 20093 08555 20094 080 08761 2027 131 1057 131 1054 5040 0306 08555 20093 08555 20094 080 080 08761 2027 131 1057 131 105 Replaceable Parts Model 8445A Table 6 2 Replaceable Parts Mfr Part Number Reference HP part Number Description Designation 5040 0 306 08555 20093 08555 20094 2190 0104 2950 0132 08761 2027 1250 0118 5040 0702 2190 0016 2950 0001 0360 1190 1251 2214 1251 0179 1251 0218 08445 60011 08445 60011 1490 0030 3150 0224 5000 0050 5000 0731 5020 0900 5020 0991 5060 0730 5060 0767 08443 40001 0844 3 40002 08445 00007 08445 00008 08445 00014 08445 00015 08445 00016 08445 00017 08445 00018 08445 00019 08445 00920 08445 00021 08445 00009 08545 00001 28855 00002 2190 3105 08555 20005 2100 3105 0757 0459 2100 3128 08445 00004 2100 3128 08445 00005 3101 1395 3100 3016 08445 00006 08445 00010 9100 3144 0360 1588 08445 20022 See INSULATOR CONTACT JACK BOOY BULKHEAD WASHER LOCK 0 439 ID NUT HEX 7 16 28 INSULATOR SEE 6 POWER LINE MODULE CONNECTOR BNC REMOTE INPUT CONNECTOR INSULATOR CONNECT OR WASHER LOCK PH BRZ NP NUT HEX BRS NP 3 8 32 X 1 2 LUG SOLDER B N C CONNEC
38. 012 1 32W 0811 3008 AIR 0811 3008 R FXD WW 8K OHM 0 01 1 32W 0811 3008 2100 1776 R VAR WW 10K OHM 5 H 1 2100 1776 1 0698 3157 R FXD FLM 19 6K OHM 1 1 8W 0698 3157 ALR1O 0757 0441 R FXD FLM 8 25K OHM 14 1 84 0757 0441 1 11 0757 0440 R FXD MET FLM 7 50K OHM 1 1 8W 0757 0440 1 12 0757 0447 R FXD FLM 16 2K OHM 1 1 84 0757 0447 ALK13 0757 0401 R FXD FLM 100 OHM 1 1 8W 0757 0401 AlR14 0811 3007 R FXD WW LOK OHM 0 014 1 32W 0811 3007 1 15 NOT ASSIGNED ALR18 NOT ASSIGNEO 1519 0811 3007 R FXO WW LOK OHM 0 01 1 32W 0811 3007 ALK20 0811 3007 R2FXD 10 OHM 0 01 1 32W 0811 3007 0757 0438 R FXDO FLM 5 11K OHM 14 1 80 0757 0438 1 22 0757 0442 R FXD FLM 10 0K OHM 14 1 8 0757 0442 ALR23 2100 1776 R VAR WW 10K OHM 5 TYPE H lW 2100 1776 ALR24 0757 0401 R FXD MET FLM 100 OHM 1 1 8 0757 0401 ALR25 0811 3009 R FXD WW 44 0K OHM 1 0 1 8W 0811 3009 ALK26 2100 1774 R VAR WW 2K OHM 5 TYPE LN 2100 1774 ALK27 0811 3112 R FXD WW 117 5K OHM 1 1 0811 3112 ALR28 2100 1776 R VAR WW 10K OHM 5 TYPE H lw 2100 1776 ALR29 0811 3007 WH LOK OHM 0 01 1 32W 0811 3007 ALR30 0757 0401 R FXD FLM 100 OHM 1 1 8W 0757 0401 1 31 2100 1776 R VAR WW LOK OHM 5 TYPE H 14 2100 1776 A1R32 0757 0441 RiFXO FLM 8 25K OHM 1 1 84 0757 0441 ALR33 0757 0274 R FXD MET FLM 1 21K OHM 1 1 8W 0757 0274 ALK34 0757 0458 R FXD FLM 51 1K OHM 1 1 8W 07
39. 1 FO 2387 1 413 1901 0025 DIODE SILICON 100 1 2387 1 1 1901 0025 DIODE SILICON 100 1 2387 ALCRI5 1901 0025 DIODE SILICON 100MA 1V FD 2387 ALCRI6 1902 0025 DIOQOE BREAKDOWN 10 0V 5 400 1902 0025 A1CR17 1902 0041 DIODE 8REAKOONN 5 11V 5X 5210939 98 0490 0367 RELAY REED 2 75 0490 0367 ALK2 0490 0367 RELAY REEO 2 75 OHM 0490 0367 1 3 0490 0 367 RELAY REED 2 75K OHM 0490 0367 ALK4 0490 0760 RELAY REED O 1AMP MAX 250V MIN 0490 0760 1 5 0490 0760 RELAY REED O 1AMP MAX 250V MIN 0490 0760 4191 1854 0071 TSTR SI NPNESELECTED FROM 2 370 1854 0071 102 1854 0071 TSTR SI NPNE SELECTED FROM 2N3704 1854 0071 103 1854 0071 TSTR SI NPN SELECTED FROM 2N3704 1854 0071 10 1854 0071 TSTR SI NPNE SELECTED FROM 2853704 1854 0071 Alu5 1854 0071 TSTR SI NPN SELECTED FROM 2N3704 1854 0071 146 1854 0071 TSTR SI NPN SELECTED FROM 2N3704 1854 0071 197 1854 0071 TSTR SI NPN SELECTED FROM 2N3704 1854 0071 198 1854 0071 TSTR SI NPN SELECTED FROM 2N3704 1854 0071 199 1853 0020 TSTR SI PNP SELECTED FROM 2N3702 1853 0020 ALQLO 1853 0020 TSTR SI PNP SELECTED FROM 2N3702 1853 0020 0757 0401 R FXD FLM 100 OHM 1 1 6W 0757 0401 AlR2 0811 3007 R FXD WW LOK OHM 0 012 1 32W 0811 3007 AlR3 0811 3007 RiFXD WW 10K OHM 0 01 1 32W 0811 3007 ALRG 0811 3008 R FXD WW 8K OHM 0 01 1 32W 0811 3008 ALRS 0811 3008 R FXO WW 8K OHM 0 014 1 32W 0811 3008 ALRS 0811 3008 R FXD WW 8K OHM 0
40. 140 69504 is required for 140S 141S Dis play Section other than Option TG 1 The modifi cation kits containing all necessary parts and information are available from any Hewlett Packard Sales and Service Office A list of Sales and Service Offices is contained in the back of this manual Service Notes P 00140 69504A and P 00140 69505 contain the modification proce dure The appropriate Service Note is included with the modification kit Cable wiring informa tion is contained in the 8555A RF Section Opera ting and Service Manual See Service Sheet 16 wiring to Auxiliary connector 1 17 TEST EQUIPMENT REQUIRED 1 18 Table 1 3 lists the test equipment and acces sories required to check adjust and repair the General Information Preselector If substitute equipment is used it must meet the Minimum Specifications listed in Table 1 3 1 19 WARRANTY 1 20 The 8445A Automatic Preselector is war ranted and certified as indicated on the inner front cover of this manual For further information contact the nearest Hewlett Packard Sales Service Office addresses are provided at the back of this manual 1 21 ACCESSORIES SUPPLIED 1 22 Table 1 2 lists the accessories supplied with the Preselector The accessories supplied are for a standard installation which provides for the Pre selector to be mounted on and joined with an 8555A Spectrum Analyzer This configuration allows the instruments to be either bench or
41. 3 BOARD BLANK 08445 20003 0360 1514 TERMINAL PIN SQUARE 0360 1514 0360 1514 TERMINAL SQUARE 0360 1514 0360 1514 TERMINAL PIN SQUARE 0360 1514 0360 1514 TERMINAL SQUARE 0360 1514 0360 1514 TERMINAL SQUARE 0360 1514 0360 1514 TERMINAL PIN SQUARE 0360 1514 0360 1514 TERMINAL PIN SQUARE 0360 1514 1820 0196 IC LINEAR VOLTAGE REGULATOR INPUT 1820 0196 1826 0013 IC LINEAR 1826 0013 1826 0013 INEAR 1826 0013 08445 60002 BOARD ASSY ORIVER 08445 60002 0160 3094 C FXO CER 1 UF 10 100VOCW 0160 3094 0160 2055 C FXD CER 0 01 UF 80 20 100VOCW 023 101 1032522 0160 3455 C FXD CER 470 10 1000VDCM C067F102F471IKS22 1901 0025 DIODE SILICON 100MA 1V FD 2387 1902 3182 0100 BREAKDOWN SILICON 12 1V 5 1902 3182 1901 0025 DIODE SILICON 100 1 FO 2387 1902 0175 DIODE BREAKDOWN 100V 1902 0175 1902 0685 DIODE BREAKDOWN 9 0V 2 001 9 1N938 1902 3104 DIODE BREAKDOWN 5 62V 5 210939 110 1902 0184 0100 BREAKDONN SILICON 16 2V 5 1902 0184 1902 3203 DIODE BREAKDOWN SILICON 14 7V 5 1902 3203 1902 0025 DIODE BREAKDOWN 10 0V 5X 400 1902 0025 2110 0094 FUSE 1 25A 250V 3121 25 1251 2313 CONNECTOR SINGLE CONTACT 3 332070 5 1251 2313 CONNECTOR SINGLE CONTACT 3 332070 5 0490 0894 RELAY 2 FORM C 2 AMP 30VDC HP110 1200 0043 ENSULATOR TSTR MOUNTING TO 3 293011 1200 0081 INSULATOR BUSHING NYLON 974 307 0340 0162 INSULATOR TSTR FOR TO 66 A0340 0162 1 2110 0269 CLIP FUSE 0 250 D
42. 480 Change MP10 to 08443 40002 PANEL TRIM STRIP LIGHT GRAY 28480 Add MPil 08445 00028 PLATE CONNECTOR OLIVE BLACK 28480 Change MP11 to 08445 00007 PLATE CONNECTOR BLACK 28480 Add MP13 08445 00024 PANEL FRONT 020 030 MINT GRAY OLIVE BLACK 28480 Change MP13 to 08445 00014 PANEL FRONT OPT 020 030 LIGHT GRAY BLACK 28480 Add MP16 08445 00025 PANEL FRONT STANDARD MINT GRAY OLIVE BLACK 28480 Change MP16 to 08445 00017 PANEL FRONT STANDARD LIGHT GRAY BLACK 28480 Add MP17 08445 00026 COVER TOP OLIVE GRAY 28480 Change MP17 to 08445 00018 COVER TOP BLUE GRAY 28480 Add MP18 08445 00027 COVER BOTTOM OLIVE GRAY 28480 Change MP18 to 08445 00019 COVER BOTTOM BLUE GRAY 28480 Add MP23 5060 8543 BRACKET JOINING KIT OLIVE GRAY 28480 Change MP23 to 5060 0216 BRACKET JOINING KIT BLUE GRAY 28480 Add MP24 5060 8739 KIT RACK MOUNTING MINT GRAY 28480 Change MP24 to 5060 0774 MOUNTING LIGHT GRAY 28480 gt CHANGE 2 Pages 5 9 and 5 12 add at end of procedures 5 11 and 5 12 NOTE See Table 8 1 Page 6 4 Table 6 2 Change A3R5 delete Factory Selected Part Change A3R8 to 0811 3243 R FXD WW 2 675 OHM 0 1 2 1 2 W 28480 Add A3R19 0757 0401 R FXD MET FLM 100 OHM 1 1 8 W 28480 Factory Selected Part Page 6 5 Table 6 2 Change A3R23 to 0757 0458 R FXD MET FLM 51 1K OHM 1 1 8 W 28480 Factory Selected Part Change A3R26 to 0757 0460 R FXD MET FLM 61 9K OHM 1 1 8 W 28480 Factory Selected Part Table 8 1 Factory Select
43. 552 141T Digital Voltmeter with 3484A Multifunction Unit HP 3480B Note Unless otherwise specified all dc voltages are measured with respect to ground test point 2 1 Connect test setup as indicated in Figure 5 2 2 Apply power to both Preselector and Spectrum Analyzer Allow at least 30 minutes for equipment stabilization 3 Set Spectrum Analyzer controls as follows BAND usata ucap h ns Sede a Ge has ae ae ie n 2 SCAN WIDTH PER DIVISION 1 MHz SCAN WIDTH Ae gee Se A ZERO INPUT ATTENUATION 52 er tele fhe BAD a ee 10 dB SCAN TIME PER DIVISION 10 MILLISECONDS SCAN MODE s es que S a a INT SCAN TRIGGER uso xr E E ux Pes AUTO LOG LINEAR a 0x sebo xt ushaq w ba let bec Roe Se Ue es LOG LOG REFERENCE LEVEL 10 dBm 4 Setswitch A1S1 to TEST position 5 Setswitch A3S1 to TEST position 6 Connect digital voltmeter to test point 1 2 and common ground point A3TP2 7 Adjust A1R8 for null indication Test limits 0 00 0 2 mV Record level 5 3 Adjustments Model 8445A ADJUSTMENTS 5 9 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 5 4 Pre Driver Checks and Adjustment
44. 57 0458 1 35 0698 3157 R FXD FLM 19 6K OHM 1 1 8W 0698 3157 ALlR36 0757 0458 R FXD FLM 51 1K OHM 1X 1 8W 0757 0458 ALR37 0698 3157 R FXD FLM 19 6K OHM 1 1 8W 0698 3157 ALR38 0757 0458 R FXO FLM 51 1K OHM 1 1 8W 0757 0458 ALK39 0698 3157 R FXD FLM 19 6K OHM 1 1 86 0698 3157 ALR4O 0757 0458 R FXD FLM 51 1K OHM 1 1 8W 0757 0458 ALRG1 0698 3157 R FXO FLM 19 6K OHM 1 1 80 0698 3157 AlR 2 NOT ASSIGNED See introduction to this section for ordering information Model 8445 Table 6 2 Replaceable Parts Reference HP part Number Qty Description Designation ALRG3 0757 0465 R FXD FLM 100K OHM 1 1 8W ALRS4 0757 0280 R FXO FLM LK OHM 1 1 8W 1665 0757 0280 R FXD FLM 1K OHM 1 1 80 ALRG6 9757 0465 R FXD FLM 100K OHM 1 1 8W ALRG7 0757 0465 R FXD FLM 100K OHM 1 1 8W A1LRGB 0683 1055 R FXD COMP 1 MEGOHM 5 1 4W 1849 0757 0442 R FXD 10 0K OHM 1X 1 84 18 50 0757 0465 R FXO FLM 100K OHM 1 1 8W ALRS1L 0757 0438 R FXD FLM 5 11K OHM 1 1 8W ALRS2 0757 0458 R FXO MET FLM 51 1K OHM 15 1 8W ALR53 0757 0199 R FXD FLM 21 5K OHM 1 1 8W ALR54 0757 0465 R FXD FLM LOOK OHM 1 1 8W ALR55 0757 0443 R FXD FLM 11 0K OHM 1 1 8W 151 3101 1162 SWITCH SLIDE MINIATURE SPOT ALTB1 08445 20001 BOARD BLANK PC ALTPL 0360 1514 TERMINAL PIN SQUARE ALTP2 0360 1514 TERMINAL SQUARE ALTP3 0360 1514 TERMINAL
45. 6 FD 2387 FD 2387 FD 2387 FD 2387 1902 0025 1902 0025 1902 3245 1902 3245 210939 98 1902 3268 1902 3268 1902 3279 312 500 312 125 TX8F 032 0258 0340 0162 1 6008 32CN 2N3054 17843 2N2904A 2N2904A 17843 17843 2N2904A 2N2904A 2N3053 1853 0020 0757 0279 0757 0439 2765 0698 3136 2100 1774 0751 0442 0757 0458 0698 3136 6 3 Replaceable Parts Model 8445A Table 6 2 Replaceable Parts Reference HP part Number Qty Description Mfr Part Number Designation 0698 3637 R FXD OX 820 OHM 5 0698 3637 0698 3620 R FXD OX 100 OHM 54 24 0698 3620 0698 3156 FLM 14 7K OHM 1 1 8W 0698 3156 0764 0016 R FXO FLM 1000 OHM 5 24 0764 0016 0698 0083 R FXO MET FLM 1 96K OHM 1 1 84 0698 0083 0757 0466 R FXD FLM 110K OHM 1 1 84 0757 0466 0757 0465 R FXD MET FLM 100 OHM 1 1 8W 0757 0465 0698 3260 R FXD FLM 464K OHM 1 1 8W 0698 3260 0698 3260 R FXO MET FLM 464K OHM 1 1 8W 0698 3260 0698 3260 R FXD FLM 464K OHM 1 1 84 0698 3260 0698 3260 R FXO FLM 464K OHM 1 1 8W 0698 3260 2100 1767 R VAR WW 10 OHM 5 TYPE H 1 2100 1767 2100 1767 R VAR WW 10 OHM 5 TYPE H 14 2100 1767 1810 0037 RESISTOR ARRAY 1K OHM 22 lW EACH 1810 0037 2100 1776 R VAR WW 10K OHM 5 TYPE H 1 2100 1776 0698 3241 R FXO FLM 250 OHM 0 25 1 8W 0698 3241 0757 0442 R FXD FLM 10 0K OHM 1 1 8W 0757 0442 0757 0442 R FXD FLM 10 0K OHM 1 1 8W 0757 0442 08445 2000
46. 8 18 4 E 3 t did P 44424 T Figure 8 17 Power Supply Assembly A2 Component Location Model 8445A Model 8445 SERVICE SHEET 5 Figure 8 18 Yig Driver Assembly A3 Component Location service OPTION 020 amp 030 P O INTERCONNECT BOARD 5 P O POWER SUPPLY ASSY A2 08445 60003 P O INTERCONNECT BOARD 5 DELETE FOR OPTIONS 010 amp 030 gt ee Fr Os XA5 aii gi COAXIAL SWITCH DRIVER I 181 EN e i 3 10K 40V o 5 INHIBIT o w AUTO FROM I XA3 PINSSE l m 2 p lt 112 BAND CODE _ 10 BAND CODE B CR11 7 1 8 18 GHz YIG FILTER I D be jain pins DISPLAY Ee BAND CODED FILTER PORT e BAND CODE CRD REFERENCE DESIGNATION OUTPUT FILTER PORT CRI RI Kl 2 ie 01 XA2 3 5 R4 5 PRE DRIVER PRE DRIVER CHASSIS fal L M ASSY Al OUTPU e 4 5 6 7 P O OPTION 020 amp 030 P O OPTION 020 amp 030 P O INTERCONNECT F s n 0 VR i 1 I 1 1 I 1 I I I 1 I 1 I 1 1 l
47. ABEL BOARD ASSY INTERCONNECT R FXD MET FLM 196K OHM 1 1 8W BOARD BLANK PC CONN PC 30 CONTACT 2x15 CONN PC 30 CONTACT 2X15 CONN PC 30 CONTACT 2X15 KEY POLARIZING FOR CKT BD SOCKETS POWER LINE MODULE NON FILTERED C FXO CER 2 X 0 005 UF 20 250VAC COIL FXO RF 10 UH FAN AXIAL 115 50 60HZ C FXD CER 0 01 UF 80 20 3 100VOCW CER 0 01 UF 80 20 LOOVDCW FUSE 1 AMP 250V FOR 115 VOLT OPERATION FUSE 0 5 AMP 250V FOR 230 VOLT OPERATION FILTER LOW PASS 0 1 8 GHZ DELETE FOR OPTIONS 010 AND 030 CONNECTOR FILTER PORT SEE SERVICE SHEET 5 AND TYPE OR APC 7 SELOW CONNECTOR FILTER PORT TYPE N BODY RF CONNECTOR CONTACT RF CONNECTOR INSULATOR CONTACT JACK BODY BULKHEAD WASHER LOCK 0 439 ID 7 16 28 INSULATOR CONNECTOR FILTER PORT 7 OPTION 001 INSTRUMENTS BODY FEMALE RF CONNECTOR PIN FEMALEsRF CONNECTOR INSULATOR CONTACT JACK BOOY BULKHEAD WASHER LOCK 0 439 ID NUT HEX 7 16 28 INSULATOR CONNECTOR FILTER PORT OPTION 001 INSTRUMENTS BODY FEMALE RF CONNECTOR PIN FEMALE RF CONNECTOR See introduction to this section for ordering information Replaceable Parts Mfr Part Number 2100 1777 0757 0458 0757 0460 2100 1777 0757 0458 0757 0460 0757 0460 0757 0458 2100 1777 0757 0401 GF124 0008 08445 20002 0360 1514 0360 1514 0360 1514 0360 1514 1826 0013 08445 60014 08445 60015 08445 60016 08445 60017 08445 60009 0698 3453 08445 20
48. ANEL CHECKS 4 6 Before proceeding to the performance tests the instrument must be adjusted and all controls set as specified in the preset adjustment instruc tions in paragraphs 4 7 and 4 8 After the instru ment controls are preset proceed with the front panel checks and adjustments The instrument should perform as called out in the preset adjust ment procedures before going on to the perform ance tests paragraphs 4 14 through 4 17 4 7 Preset Adjustments 4 8 Install Preselector with Spectrum Analyzer Ensure that the 115 230V line selector switch is set to correspond with the available line voltage Connect interconnect cable between AUX B out put on the Display Section and TUNING CON TROL SPECTRUM ANALYZER input on the Preselector Connect Preselector and Spectrum Analyzer to line voltage source and apply power While the instruments are warming up make the following control settings a PRESELECTOR with manual controls b SPECTRUM ANALYZER BAND n 1 2 05 GHz IF FREQUENCY 30 MHz FINE TUNE Centered BANDWIDTH 100 kHz SCAN WIDTH PER DIVISION SCAN WIDTH PER DIVISION 10 MHz INPUT ATTENUATION 10 SIGNAL IDENTIFIER OFF BASE LINE CLIPPER CCW LOG LOG REF LEVEL 0 dBm LOG REF LEVEL Vernier 0 VIDEO FILTER
49. Analyzer LOG REF LEVEL Vernier control may be adjusted to compensate for the indicated insertion loss FREQ OFFSET Adjusts Yig driver to compensate for offset in Yig filter tuning due to residual magnet ism in core structure Adjusted to center the Yig filter at 2 0 GHz for wide range tracking Adjusted for minimum filter insertion loss during power level measurements Slight interaction with TRACKING adjustment See Figure 3 5 Operational Adjust ments 1 8 to 18 GHz TRACKING Adjusts Yig driver gain to match linear current frequency curve of Yig filter Adjusted during operational adjustments at a frequency of 8 GHz Adjustment required to match tuning of Preselector with tuning of Spectrum Analyzer Interacts with FREQ OFFSET adjustment See Figure 3 5 Opera tional Adjustments 1 8 to 18 GHz FILTER PORTS Input and output connectors Either port may be used for RF input or output Standard installation configuration utilizes lower port as output port Rigid coaxial cable supplied to con nect lower port to analyzer INPUT connector Type N coaxial connectors normally provided Option 001 instruments supplied with APC 7 connectors See Table 1 4 for optional rigid coaxial interconnect cables Figure 3 1 Front Panel Controls Connectors and Indicators Model 8445A Operation REAR PANEL 001 56960 PE BO 966 9909099095 90 XXX x 9 KALANA o Air Intake Maintain at least
50. EFROST Blue Star Ltd Band Box House PraLhadevi Bombay 250D Tel 45 73 01 leier 2150 Cable BLUESTAR Blue Star Ltd 14 40 Civil Lines Kanpur India 6 88 82 Cable BLUESTAR Blue Star Ltd 7 Hore Stieet 506 Calcutta 1 india Tel 23 0131 etex 655 Cable BLUESTAR india EUROPE Hewlett Packard Verlriebs GmbH Reginfriedstrasse 13 08 Munchen 5 Tel 0811 69 59 71 75 Cable HEWPACKSA Munchen Telex 52 49 85 GREECE Kostas Karayannis 18 rmou Street Athens 126 Tel 230301 3 5 Cable RAKAR Athens Telex 21 59 62 RKAR GR IRELAND Hewlett Packard Ltd 224 Bath Road Slough SLI 4 05 Bucks Te Slough 753 3341 Cable HEWPIE Slough Telex 84413 ITALY Hewlett Packard S p A Via Amerigo Vespucci 2 120124 Milan Tet 2 625 10 lines Cable HEWPACKIT Milan Telex 32046 Hewlett Packard italiana S p A Palazzo Italia Maicon 25 1 00144 Rome Eur Tel 6 591 2544 Cable HEWPACKIT Rome Telex 61514 AFRICA ASIA Blue stac Ltd Blue 5tar House 34 Ring Road Lapat Nugat New Delhi 24 indis Tet 62 J 6 Teiex 463 Cable BLUESTAK Blue Star Ltd 17 C Ulsoor Road Banyalore 8 Biue Star Ltd 96 Park Lane Secunderabad 3 India Vel 7 63 91 BLuEFROST Blue Star Ltd 23 24 Second Line Beach Madras 1 India 2 39 55 telex 379 Cable BLUESTAR Blue Star 414 18 huser Bungalow Dindh Road Jamshedpur Indis Tel 38 04 Cable
51. EVEL na Sree Se Bb AS a ae ot 30 dBm SCAN MODE 22 tie gc VUE Ere v Rule Er ERE is at 2 INT SCAN TRIGGER AUTO 13 Connect Comb Generator adjusted for maximum 100 MHz comb signals to upper Preselector FILTER PORT 14 Tune Spectrum Analyzer FREQUENCY control to center the 2 GHz comb signal on the CRT display 15 Reduce SCAN WIDTH PER DIVISION to 2 MHz keeping signal centered on display with FREQUENCY control 16 Reduce SCAN WIDTH PER DIVISION to 100 kHz center signal on display with FINE TUNE control 17 Adjust Preselector FREQ OFFSET control to maximize signal on CRT display 18 Set SCAN WIDTH PER DIVISION to 100 MHz 19 Select n 2 BAND and tune Spectrum Analyzer to 8 GHz 20 Repeat steps 15 and 16 21 Adjust Preselector TRACKING control to maximize signal on CRT display 22 Repeat steps 14 through 21 Note A8R5 factory selected to set center range of TRACKING control R2 Null adjustment A3R7 may be adjusted to set center range of FREQ OFFSET control R1 23 Connect Sweep Oscillator RF Unit output to upper FILTER PORT on Preselector 24 Set Spectrum Analyzer controls as follows SCAN WIDTH PER DIVISION to 10 MHz BAND to 4 and FREQUENCY to 12 5 GHz 25 Adjust Sweep Oscillator and RF Unit for a 12 5 GHz signal at a power output level of 20 dBm centered on CRT display 26 Adjust A3R24 to maximize signal on CRT displa
52. FIERS AND SWITCHING CIRCUITS 9 Vdc REFERENCE OPTIONS 020 030 SUMMING AMPL 203 2 05GHz IF OR 550 MHz IF OFFSET NETWORK FSET gt 20V FROM 8555 REMOTE CONTROL AMPL A2U3 REMOTE _ 1 GHz VOLT MANUAL RF SECTION CONTROL INTERFACE SWITCH AMPL BAND CODE CONTROL A2U2 B 115 B D OPTIONS 020 030 OPTIONS 020 030 MANUAL CONTROLS 1 8 18 GHz YIG FILTER POWER SUMMING YIG AMPL gt DRIVER E TRACKING DELETE FOR OPTIONS 020 030 1 8 18 GHz Service NOTES A DELETE JUMPER FOR OPTIONS 020 030 Figure 8 6 Preselector Block Diagram 8 11 SERVICE SHEET 2 PRESELECTOR TROUBLESHOOTING PROCEDURE A malfunction in the Preselector or interconnecting cable can affect operation of the Spectrum Analyzer Likewise a malfunction in the Spectrum Analyzer can affect Preselector operation Before trouble shooting either instrument disconnect Preselector from the Spectrum Analyzer and check analyzer performance If the analyzer performs satisfactorily proceed with the Preselector troubleshooting procedure Maximum utilization of the Preselector s operating capability should be made to isolate a malfunction Units with manual controls can be switched to the MANUAL operating MODE and tuned over the instrument s o
53. G controls For optimum with the available line voltage Refer to Figure 3 2 remote operation perform Yig Driver Adjustments steps 4 5 and 6 for switch and fuse information Linear Operation paragraph 5 12 After adjustment apply label over FREQ OFFSET and TRACKING 2 For instruments without front panel controls discon controls with notation that instrument adjusted for nect interconnect cable between AUX B output on linear operation Spectrum Analyzer Display Section and TUNING Note CONTROL SPECTRUM ANALYZER input on Preselector Instruments shipped from factory and or repair center adjusted for linear operation 3 For instruments with front panel controls set MODE switch to REMOTE Interconnect cable may be in stalled or removed 7 Adjust voltage source to tune Yig filter to frequency 4 Connect Preselector to line voltage source and apply of interest The bandpass of the Yig filter typically power 30 to 45 MHz requires a source with a fine voltage adjustment to center filter bandpass at the frequency 5 Connect a variable 0 to 20 volt de voltage source of interest through a coaxial cable with a BNC connector to the x REMOTE input on the Preselector Connect the 8 Connect signal source to one of the FILTER PORTS 6 The REMOTE input voltage to frequency ratio of 1 9 Fine tune the input dc voltage source to peak the Yig volt GHz is affected by the position of the FREQ filter for maximum output Figure 3 6 Yig Filter Rem
54. Hewlett Packard Schweiz A G Rue du Bois du Lan 7 1217 Meyrin 2 Geneva Tel 022 41 54 00 Cable HEWPACKSA Geneva Telex 27333 HPSA TURKEY Telekom Engineering Bureau 376 Karakoy Istanbul Tel 49 40 40 Cabte TELEMATION Istanbul PAKISTAN EAST Mushko amp Company 119 a Jinnah Avenue Dacca Tel 280058 Cable NEWDEAL Dacca PAKISTAN WEST Mushko amp Company Ltd Ousman Chambers Abdullah Haroon Rod Karachi 3 Tei 511027 512927 Cable Karachi PHILIPPINES Clectromes inec Makati Commercial Center 2129 Pasong Makati Rizal D 708 P O 1028 Manila Tel 89 85 01 88 91 71 Cable ELEMEX Manila SINGAPORE Mechanical and Combustion Engineering Company Ltd 9 Jalan Kilang Mill industrial Estate Singapore 3 642361 3 632611 Cable MECOME Singapore Hewlett Packard Fer East Area Office P O Bux 87 Alexandra Post Office Singapore 3 let 633022 HEWPACK SINGAPORE SOUTH AFRICA Hewlett Packard South Africa Pty Ltd 31716 Biaamluntein Transvaal Milnerton 36 De Beer Street Johannesburg del 725 2080 725 2030 Telex 0226 JH Cable HEWPACK Johannesburg Hewlett Packard South Africa Pty Ltd Breecastle House Gee Street Cape Town lel 36019 36545 Cable Cape Town feiex 5 0006 Hewlett Packard South Africa vPly Md 308 Glenmoug Centre Corner Hunt amp M
55. IA 6008 32CN 08445 00003 HEAT SINK DRIVER 08445 00003 1854 0022 TSTR SI NPN 17843 1853 0020 TSTR SI PNPISELECTED FROM 2N3702 1853 0020 1854 0237 TSTR SI NPN 2N3738 1854 0217 TSTR SI NPN 2N3442 0757 0458 R FXD MET FLM 51 1 OHM 1 1 84 0757 0458 0757 0422 R FXO FLM 909 OHM 1 1 84 0757 0422 0811 3007 R FXD WW 10 OHM 0 01 1 32W 0811 3007 0698 3161 R FXD FLM 38 3K OHM 1 1 8W 0698 3161 0698 3434 R FXD MET FLM 34 8 OHM 1 1 8 0698 3434 FACTORY SELECTED PART 0811 1362 R FXD WW 1000 OHM 0 01 1 4W 0811 1362 2100 1776 R VAR WW 10K OHM 5 TYPE H 14 2100 1776 0811 3040 R FXO WW 2 601 OHM 0 1 2 1 2W 0811 3040 0757 0442 R FXD FLM 10 0K OHM 13 1 8W 0757 0442 0757 0317 R FXD FLM 1 33K OHM 1 1 8W 0757 0317 0698 3150 R FXD FLM 2 37K OHM 1 1 8W 0698 3150 0698 3441 R FXO FLM 215 OHM 1X 1 84 0698 3441 0757 0199 R FXD FLM 21 5K OHM 11 1 8W 0757 0199 0757 0280 R FXO FLM OHM 1 1 8W 0757 0280 0757 0279 R FXD FLM 3 16 OHM 1 1 8W 0757 0279 0698 3136 R FXD FLM 17 8K OHM 1 1 84 0698 3136 0757 0280 R FXD FLM LK OHM 1 1 84 0757 0280 0698 3160 R FXD MET FLM 31 6K OHM 1 1 84 0698 3160 NOT ASSIGNED See introduction to this section for ordering information 6 4 Model 8445A Reference HP part Number Qty Designation 2100 1777 0757 0458 0757 0460 2100 1777 0757 0458 0757 0460 0757 0460 0757 0458 2100 1777 0757 0401 3101 1162 08445 20002 036
56. IES ASSOCIATION WASHINGTON 20006 91506 AUGAT INC ATTLEBORO MASS 02703 98978 INTERNATIONAL ELECT RESEARCH CORP BURBANK CALIF 91502 6 7 6 8 Model 8445A Manual Changes SECTION VII MANUAL CHANGES 7 1 CURRENT INSTRUMENTS 1 2 This manual applies directly to Model 8445A Automatic Preselector having the following serial numbers 1129A and above 7 3 OLDER INSTRUMENTS 7 4 The following changes have been made Serial prefixes 1119A and below Fuse 1 was not installed Serials 1119A00120 and below A1R27 is 121K ohms A1R28 is 5000 ohms 7 5 NEWER INSTRUMENTS 7 6 As changes are made newer instruments may have serial prefix numbers not listed in this man ual The manuals for these instruments will be sup plied with an additional Manual Changes sheet containing the required information contact your nearest Hewlett Packard sales and service office for information if this sheet is missing 7 1 7 2 Model 8445A Service SECTION VIII SERVICE 8 1 INTRODUCTION 8 2 This section provides instructions for trouble shooting and repair of the HP 8445A Automatic Preselector 8 3 PRINCIPLES OF OPERATION 8 4 Information relative to the principles of operation appears on the foldout pages opposite the Block Diagram Service Sheet 1 Theory of Operation appears on the foldout pages opposite each of the foldout schematic diagrams The sche matic diagram circuits are referenced to the
57. IGH OUTPUT IMPEDANCE VERY LOW D V OUTPUT R2 INPUT GAIN RI R2 INPUT IMPEDANCE R2 OUTPUT IMPEDANCE VERY LOW IF A IS LARGE Vc V R1 Ri 1 Vs V 97 HD _ 1 1 Vy 0 lt h 1 THEN _ 1 3 IF V 0 55 THEN Vg V 95 Figure 8 3 Operational Amplifier Equivalent Circuit 8 7 8 8 Model 8445A TOP INTERNAL VIEW ADJUSTMENT AND TEST POINT LOCATIONS TOP INTERNAL VIEW OPTION 020 2 1 1826 A2R20 A2R21 2 5 1 28 9 e remote Yl 9 A3R24 lt 5 9 z 2 255 2 5 2 4 A2TP2 2 INTERNAL Figure 8 4a 8445A Preselector Top Internal View Figure 8 4b 8445A Option 020 Preselector Top Internal View Figure 8 5 Adjustment and Test Point Locations VIEWS 8 9 SERVICE SHEET 1 cont d Band Code bit D from the analyzer The output is a voltage proportional to the analyzer s 15 IF offset The frequency to voltage ratio is 1 025 GHz Volt The Pre Driver Retrace Sense Amplifier is triggered by the 5 to 5 volt PER DIVISION sweep signal or by the Sweep Tune signal when the analyzer is in the FULL SCAN WIDTH mode The output of the Retrace Sense Amplifier is applied to the Yig Reset Amplifier During retrace the output of the Yig Reset Amplifier causes the Summing Amplifier to change the voltage level to the Yig Driver equal to a 4 GHz drop in frequency By tuning the Yig Filter below the startin
58. ION to 0 2 MHz keeping signal centered on CRT with FREQUENCY control Rotate LOG REF LEVEL contro fully counterclock wise Set LOG LINEAR switch to LINEAR and adjust LINEAR SENSITIVITY controls for a 7 1 division display of the 1 5 GHz signal Disconnect cable at Analyzer INPUT and connect to upper FILTER PORT on Preselector Connect rigid coaxial cable between lower Preselector FILTER PORT and Analyzer INPUT Note and record low pass filter insertion loss at 1 5 GHz From the LIN 7 to 5 line equals approximately 3 dB 1 5 GHz low pass filter insertion loss lt 2 5 dB Set LOG LINEAR switch to LOG Set LOG REF LEVEL Vernier control to compensate for the amount of insertion loss indicated in step 20 The Preselector and Analyzer are now calibrated at 1 5 GHz Remove cable between upper filter port and SEC OND LO OUTPUT Install 50 ohm termination on SECOND LO OUT PUT connector Connect signal 10 MHz to 1 8 GHz under investiga tion to upper FILTER PORT of Preselector Set LOG REF LEVEL vernier control to compensate for insertion loss using data obtained in steps 8 or 20 above or the data on the PRESELECTOR INSER TION LOSS chart Figure 3 4 Operational Adjustments Low Pass Filter Operation 10 MHz to 1 8 GHz 2 of 2 1 Operation Model 8445A OPERATIONAL ADJUSTMENTS een ooe ew w 04454 AUTOMATIC PRESELECTOR nmn Figure 3 5 Operational Adjustments
59. IONAL DETECTOR COUPLER OSCILLOSCOPE INDICATOR DIGITAL VOLTMETER MULTIFUNCTI ON UNIT 10 dB PAD NOTE See Figure 8 5 for adjustment and test point locations Figure 5 5 Yig Driver Check and Adjustment Test Setup Linear Operation EQUIPMENT Sweep Oscillator Vu ec Rp arc ao OUR TRUE heh oe HP 8690B 4 uu eec mco Ros endete qe v ot en Sete N HP 8692B RE Unit 44 uu mede esum AVE Ge en HP 8694B RFE Unit scho h Hae bw LO a HP 8695A Swept Frequency Indicator 1416 Oscilloscope Display Section HP 140 Series Power Supply 55 oe de a eB HE mM HP 6205B Frequency 536 Frequency Meter HP 537A Frequency Meter HP P532A Digital Voltmeter with 3484A Multifunction HP 3480B Directional Coupler 2each HP 779D Crystal D tector eh ea US AES HP 8470A Coaxial Attenuator 10 daB HP 8491B Crystal Detector HP 423A Adapter APC 7 to N male HP 11525A 1 Connect test setup as indicated in Figure 5 5 Apply power and allow at least 30 minutes for equipment to stabilize Note Perform the Power
60. In the matching procedure the Preselector driver is adjusted by tuning the passband to track the analyzer tuning response at selected frequen cies Both of the above procedures are contained in Section V Yig Driver Adjustments paragraphs 5 11 and 5 12 of this manual Additional improve ment can be made in matched operation by a more accurate adjustment of the Yig driver in the 8555A Spectrum Analyzer RF Section In the normal adjustment procedure the RF Section Yig driver is adjusted with a tolerance of 005 Vdc which is equivalent to 5 MHz in LO tuning On the n 4 bands the voltage to the Yig driver in the RF Section and the voltage to the Preselector could be off as much as 020 Vdc or 20 MHz By adjusting the Yig driver in the 8555A to a toler ance of 002 Vdc the error in the output voltage to the Preslector can cause only a 8 MHz tuning error on the n 4 band This error is well within the passband of the Preselector 3 24 Preselector tracking on the n 1 through n 2 bands is controlled by front panel FREQ OFFSET Operation and TRACKING controls Correct adjustment will provide hands off tracking through 10 5 GHz At frequencies below approximately 4 0 GHz there is some error in signal amplitude when tracking in the center of the passband see Figure 3 8 The Preselector insertion loss calibration curve is based on a signal tuned to the peak in the passband not to the center passband dip For accurate amplitude meas
61. L STD 681 is the same as the resistor color code First number identifies the base color second number the wider stripe and the third number identifies the narrower stripe E g denotes white base yellow wide stripe violet narrow stripe harmonic number 151 LO fundamental 1st LO above or below 1st IF 550 MHz 1st IF no asterisk 2050 MHz 1st IF Letter off page connection Number Service Sheet location for off page connection Service d Insert component leads into mounting holes and position component as original was pasitioned Do not force leads into mounting holes sharp lead ends may damage the plated through conductor Note Although not recommended when both sides of the circuit board are accessible axial lead components such as resistors and tubular capacitors can be replaced without unsoldering Clip leads near body of defective component remove compo nent and straighten leads left in board Wrap leads of replacement component one turn around original leads Solder wrapped connection and clip off excess lead 8 23 GENERAL SERVICE INFORMATION 8 24 Transistors and diodes are used throughout the Preselector in circuit configurations such as delay circuits trigger circuits switches oscillators and various types of amplifiers Basic transistor operation is shown in the following pages Model 8445A 8 25 Transistor In Circuit Testing The common causes of transistor failure are internal sho
62. OPERATING AND SERVICE MANUAL AUTOMATIC PRESELECTOR 8445A OCTOBER 1971 HEWLETT h PACKARD VGtrr8 dH CERTIFICATION The Hewlett Packard Company certifies that this instrument was thoroughly tested and inspected and found to meet its published specifications when it was shipped from the factory The Hewlett Packard Company further certifies that its calibration measure ments are traceable to the U S National Bureau of Standards to the extent allowed by the Bureaws calibration facility WARRANTY AND ASSISTANCE All Hewlett Packard products are warranted against defects in materials and workmanship This warranty applies for one year from the date of delivery or in the case of certain major compo nents listed in the operating manual for the specified period We will repair or replace products which prove to be defective during the warranty period provided they are returned to Hewlett Packard No other warranty is expressed or implied We are not liable for consequential damages Service contracts or customer assistance agreements are available for Hewlett Packard products that require maintenance and re pair on site For any assistance contact your nearest Hewlett Packard Sales and Service Office Addresses are provided at the back of this manual AUTOMATIC PRESELECTOR 8445A Serial Numbers Prefixed 1129A This manual applies directly to HP Model 8445A Automatic Preselectors having the above listed serial pre
63. PIN SQUARE ALTP4 0360 1514 TERMINAL PIN SQUARE ALTPS 0360 1514 TERMINAL PIN SQUARE Alul 1826 0013 IC LINEAR Alu2 1826 0013 IC LINEAR 193 1826 0013 IC LINEAR A1J4 1826 0013 IC LINEAR ALUS 1826 0013 IC LINEAR A2 08445 60003 BOARD ASSY POWER SUPPLY AgCl 0180 2181 C FXD ELECT 1300 UF 75 10 SOVOCW A2C2 0180 1819 CzFXO ELECT 100 UF 75 10 SOVOCW A2C3 0160 3467 C FXD CER OISC 100 PF 103 250VDCW 2 0160 3459 C FXD CER 0 02 UF 20 100VDCW 2 5 0160 2055 C FXO CER 0 01 UF 80 20 100V0CW 2 41 1901 0200 DIODE SILICON 100 PIV A2CR2 1901 0200 DIODE SILICON 100 PIV 3A A2CR3 1901 0200 DIODE SILICON 100 PIV 3A A2CRS 1901 0200 0100 5141 0 100 PIV A2CR5 1901 0159 DIODE SILICON 0 75A 400PIV A2CRO 1901 0159 DIODE SILICON 0 75 400PIV A2CRT 1901 0159 DIODE SILICON 0 75A 400PIV A2CRB 1901 0159 DIODE SILICON 0 75A 400PIV A2CR9 1902 3256 DIOOE 8REAKDOWN SILICON 23 7V 5 A2CR10 1901 0025 DIODE SILICON 100 1 A2CR11 1901 0025 DIODE SILICON 100 1 A2CR12 1901 0025 DIODE SILICON 100 1 A2CR13 1901 0025 DIODE SILICON 100 1 AZCR14 1902 0025 DIODE BREAKDOWN 10 0V 5 400 A2CR15 1902 0025 DIODE BREAKOOWN 10 0V 5 400 MW A2CR16 1902 3245 DIODE BREAKDOWN SILICON 21 5V 5 2 1 1902 3245 DIODE SREAKOOWN SILICON 21 5 5 A2CR18 1902 0041 OIODE BREAKDOWN 5 11V 5 A2CR19 1902 3268 0100 BREAKDOWN 26 1V 5 A2CR20 1902 3268 DIODE BREAKOOWN 26 1V 5 A2CR2L 1902 3279 0100 BREAKDOWN 28 7V 2 1 2110
64. R TRANSFORMER 9V TO XA1 PIN 2 1 PWR GROUND ik REF GROUND 9K PlOAS Tei 27 7V RMS 80 1A 40V 19 5V POWER SUPPLY 23V POWER SUPPLY fers he somes 9V IF OFFSET SUPPLY OPERATE TEST P O YIG lt gt FILTER nw 0010 n 0011 1 n 0000 P TE 19 5V n 0001 Le POWER n 1000 GROUND n AE K n E 23V n 0101 4 SIGNAL n 1100 pepe GROUND n 1101 1 8 GHz LOW PASS FILTER 28 14V Service P O 5 YIG FILTER 4 Y1G DRIVER E t Ge m rn Figure 8 7 Preselector Troubleshooting Block Diagram 8 13 SERVICE SHEET 3 THEORY OF OPERATION PRE DRIVER ASSEMBLY 1 Service Sheet 3 contains the schematic diagram for the Pre Driver Assembly Al except for the manual and remote tuning circuitry Service Sheet 5 The Pre Driver converts the sweep sweep tune and band code signals from the 8555A RF Section to a voltage that is proportional to the frequency to which the RF Section is tuned The circuitry consists of a harmonic number amplifier n or amplifier IF 550 MHz or 2 05 GHz network summing amplifier Yig reset circuit and logic decoder relay driver circuit HARMONIC NUMBER AMPLIFIER The harmonic number amplifier 101 multiplies the sweep tune voltage by a factor of n x 0 4 The sweep tune voltage is pro
65. R RF UNIT r 1 REMOTE 1 Le J SPECTRUM ANALYZER Figure 4 3 Insertion Loss Test Setup 1 8 18 GHz EQUIPMENT Spectrum Analyzer 2 HP 8555A 8552 141T Sweep Oscillators HP 8690B 8692B 8693B 8694B 8695A OU HP 6205B Coaxial Cable BNC to alligator clips HP 10501A 1 Connect test setup as indicated in Figure 4 3 and make the following control settings PRESELECTOR BINE OR BION z vem m Ree Sha Gere gl eet ON MODE dae a w hh S Gad ad Se GR REMOTE Preselectors without manual controls disconnect cable between Preselector and Display Section POWER SUPPLY POWER Sag ones a we ee Ee es eR US RR do ON SWEEP OSCILLATOR WITH 8692B RF UNIT NE RF SWEEP SELECTOR Ss aes Uem CW START GW AR EIE w eae 4 0 GHz EUNGTION ca 5g a crue E uxor nae ON Sag gh Sar START STOP ALC os 22 eR e e abe he teks Boe Sata ge a oth ae On ANALYZER BAND A ue n 2 FREQUENCY 50255 ee Ble POX oe eS Kas 4 0 GHz 4 7 Performance Tests Model 84454 PERFORMANCE TESTS 4 16 Yig Filter Insertion Loss 10 11 12 13 14 15 16 17 4 8 SCAN WIDTH PER DIVISION 10 MHz INPUT ATTENUATION
66. RENCE DESIGNATORS fuse Filter jack relay inductor loud speaker meter microphone mechanical part ABBREVIATIONS henries hardware hexagonal mercury hour s Hertz intermediate freq impregnated incandescent include s insulation ed internal kilo 1000 Wow H HN wow u OH u I l H H left hand linear taper lock washer logarithmic taper low pass filter milli 10 3 meg 106 metal film metallic oxide manufacturer mega Hertz miniature momentary metalized substrate mounting mylar nano 10 9 normally closed neon nickel plate N O NOM NPO plug transistor resistor thermistor switch transformer terminal board test point integrated circuit normally open nominal negative positive zero zero tem perature coef ficient negative positive H H NM HW H ow wo H OH H negative not recommended for field re placement not separately replaceable order by description oval head oxide peak printed circuit picofarads 10 12 farads phosphor bronze Phillips peak inverse voltage positive negative positive part of polystrene porcelain position s potentiometer peak to peak point peak working volt age rectifier radio frequency round head or right hand SECT SEMICON SI SIL SL SPG SPL SST SR STL TA TD TGL THD TI TOL i H H H uou 9g n un H H vacuum tube neon bulb photocell
67. REQ OFFSET control R1 Remove fuse A3F1 Disconnect interconnect cable between Preselector and Spectrum Analyzer 3 Connect jumper between test points anode of 4 Connect a jumper between test points 2 and A3TP4 5 Connect terminal of digital voltmeter to test point 2 6 Connect terminal of digital voltmeter to test point 7 Adjust A3R7 for zero indication on digital voltmeter 8 Remove jumpers installed in steps 3 and 4 above 9 Disconnect digital voltmeter and install fuse A3F1 5 1 Adjustments Model 8445A ADJUSTMENTS 5 11 Yig Driver Adjustments Matched Operation cont d 10 Install interconnect cable between Preselector and Spectrum Analyzer 11 Connect rigid coaxial cable between lower FILTER PORT on Preselector and RF Section INPUT 12 Set Spectrum Analyzer controls as follows BAND ut Su erem ar ed eot det x NL NL IQ PR Tas o Rep eR edu a n 1 550 MHz IF EREQUENGCY Mink eB GW APA ard Gee 5 2 GHz SCAN WIDTH Z emos ere es Re DOSE RESI PER DIVISION SCAN WIDTH PER DIVISION 10 MHz BANDWIDTH 5 14 sI eee ala BEEP ua NUS QU SR 300 kHz INPUT ATTENUATION RA eU 10 dB SCAN TIME PER DIVISION 10 MILLISECONDS LOG LINEAR 2 225 UR RO Ge LOG LOG REE L
68. RMS at 0 1 Amp input to the power supply m 40 VDC AND 19 5 VDC POWER SUPPLIES The 27 7 V RMS at 1 5 Amp input from power transformer T1 is rectified by diodes A2CRI1 CR4 and filtered by 2 1 to provide a 40 Vdc unregulated source The 40 Vdc source is electronically regulated to provide 19 5 Vdc source A2UI is a monolithic integrated circuit voltage regulator used to drive series pass transistor A2Q1 Current limiting is provided by A2F1 and A2R3 connected in series with the pass transistor and across the emitter base junction of the voltage regulator transistor Overvoltage protection is provided by A2CR19 CR20 and A2F1 Voltage divider A2R4 R5 and R6 provides an adjustable reference voltage to the voltage regulator 23 VOLT POWER SUPPLY The 27 7 V RMS at 0 1 Amp input from power transformer T1 is rectified by diodes A2CR5 CR8 and filter by A2C2 to provide 40 volt unregulated source The 40 volt source is electronically regulated to 23 volts The 23 volt supply is regulated by a standard Rouph regulator using a 23 7 volt breakdown diode as a reference element Overload protection is provided by fuse A2F2 with overvoltage protection provided by breakdown diode A2CR21 TROUBLESHOOTING PROCEDURE When a malfunction has been isolated to one of the three power supplies or to isolate a malfunction in one of the supplies perform the following procedure Make all voltage measurements in reference to 2 com
69. SECTION VI REPLACEABLE PARTS pro vides ordering information for all replaceable parts and assemblies SECTION VH MANUAL CHANGES nor mally will contain no relevant information in the original issue of a manual This section is reserved to provide back dated and up dated information in manual revisions or reprints SECTION VUI SERVICE includes all inform ation required to service the instrument 1 5 INSTRUMENTS COVERED BY MANUAL 1 6 Hewlett Packard instruments carry a serial number see Figure 1 2 on the back panel When the serial number prefix on the instrument serial number plate of your instrument is the same as one of the prefix numbers on the inside title page of this manual the manual applies directly to the instrument When the instrument seria number prefix is not listed on the inside title page of initial issue manual change sheets and manual up dating information is provided Later editions or revisions to the manual will contain the required change information in Section VII SERIAL NUMBER SERIAL PREFIX HEWLETT PACKARD Figure 1 2 Instrument Identification 1 7 DESCRIPTION 1 8 The Model 8445A Automatic Preselector is designed to complement the Model 8555A Spec trum Analyzer RF Section The Preselector covers the frequency range of 0 to 18 GHz When used with the 8555A Spectrum Analyzer the Preselec tor functions to reduce or eliminate signal inter modulation and multiple and spurious
70. Supply and Pre Driver Check and Adjustment Procedures prior to performing the Yig Driver Adjustments Linear Operation 5 10 Model 8445 Adjustments ADJUSTMENTS s c F 5 12 Yig Driver Adjustments Linear Operation cont d 2 Set controls as follows PRESELECTOR Remote Operaton MODE 9 5 biete duin Sad how a pde dcs MA aoe REMOTE SWEEP OSCILLATOR 8690B 8692B SPART GW xii Pub SSE e EIL Nie eus tereti 2 0 GHz oN 4 0 GHz SWEEP SELECTOR A Jee Seu P AUTO ed kan 10 1 SWEEP TIME Vernier LINE SYNC FUNCTION S Seca yas at e etm a te Ste mulsum a hin AF BOWER LEY Bias dto d ped ah etre sen dx ty ypt es 4 POWER SUPPLY 574 A ns Be 2 000 001 Vdc Note Make all Power Supply voltage adjustments by first setting voltage output to 0 volt and approaching set level in a positive going direction This reduces the effects of hysteresis in the magnetic core structure SWEPT FREQUENCY INDICATOR Z ak ae Y ue Grun a b SS N PU Do ped e debis LOG SENSITIVITY cuve qu e X B aero See Pe ORE UE We 9 dB CM BANDWIDTH e d de e ce ok dos HIGH ATTENUATION DB Sor eee e aei Ge GET aud 0 3 Adjust REFERENCE SET on Swept Fre
71. T 3 Model 8445A SERVICE SHEET cont d E LOGIC DECODER RELAY DRIVERS Check the logic decoder relay drivers using the tables below Analyzer Harmonic Relay Relay Number 1 4 A1K5 closed LN closed Band Code Bits 1 20 Vdc 0 open circuit approximately 12 Vdc 5 V DIV TP1 5 V DIV TP U5 6 Figure 8 8 Hysteresis Reset Circuit Waveforms 8 14 Service 2 0 TP3 20 0 TPS Model 8445A SERVICE SHEET 3 Figure 8 9 Pre Driver Assembly 1 Component Location INTERCONNECT BOARD 5 ERE DRIVER ASSY Al 08445 60001 Service SWEEP SENSE VIGHILTER HYSTERESIS 3 v I 19 5V a a E M i CLUDES NUMBER eg Ri OF ASSEMBLY ai 15 AIR DESIGNATIONS OF OTHER COMPONENTS R46 COMPLETE AS SHOWN P O Pi0 5V 100K Kn PER DIVISION 5 XAl Eun 0 I 5V SWEEP wi 2 weep HARMONIC BAND CODE INPUT RA NUMBER AB DE FROM Adj i 05 1000 5 010 55A 1 I Gu EE SECTION 5 R55 826 0013 001 E 1 000 09 010 845 52 0 0 i 1853 0020 1000 51 1K 010 23V 23V A R54 Ww 87 100 T MK JF HARMONIC NUMBER AMPL 101 1 m R4 5 16000 1 1 sweep 1 853 8000 8000 88000 800 SWEEP 0 1 1 1 2 5 K1B K2B 2 1 TUNE 0 TUNE OPERATE BV R2
72. TION Service Sheet 4 contains the schematic diagram for the Automatic Switching Control circuit 9 Volt IF Offset Supply and the Yig Driver AUTOMATIC SWITCHING CONTROL See Service Sheet 5 E 9 VOLT IF OFFSET SUPPLY Resistor A3R10 and breakdown diode A3CR5 form a diode regulated 9 volt power supply The 9 volt source is utilized by the n or amplifier 102 to provide an IF frequency offset Switch A3S1 is provided for test and adjustment purposes E vic DRIVER The Yig driver consists of operational amplifier A3U1 transistors A3Q2 Q3 and Q4 and their associated components The input voltage to the Yig driver is a negative voltage proportional to frequency with a ratio of 1 025 GHz volt The Yig driver output is a current proportional to frequency to match the linear current frequency curve of the Yig filter The current to frequency ratio of the Yig filter is 25 8 MHz mA with an offset of approximately 255 MHz due primarily to residual magnetism in the core structure To correct for the frequency offset the Yig driver produces a current that is equal to the following equation _ MHz 255 I mA 25 8 where 1025 x Vinput to Yig driver The current required to tune the Yig filter varies from approximately 70 mA at 2 GHz to 700 mA at 18 GHz Figure 8 11 is a simplified schematic of the Yig driver and Yig filter coil The negative input voltage is inverted by U1 As the input voltage increases the drive
73. TOR R amp P 12 MALE CONTACTS CONNECTOR COAXIAL CONNECTOR LOCK POST SUBMINAT TYPE D SWITCH PRECISIGN COAXIAL DELETE FOR OPTIONS 010 AND 030 SWITCH PRECISION COAXIAL DELETE FOR OPTIONS 010 AND 030 CABINET PARTS STAND TILT FILTER AIR TRIM SIOES COVER SIDE PERFORATED FRONT PANEL TRIM BOTTOM FRONT PANEL TRIM TOP FRAME ASSY 3 X 16 FOOT ASSY FM WINOOW COUNTER WINDQW TRIM STRIP PLATE CONNECTOR CLAMP FRONT PANEL TRIM PANEL FRONT FOR OPTION 020 AND 030 SUB PANEL FRONT PANEL REAR PANEL FRONT STANDARD FOR OPTIONS 020 AND 030 COVER TOP COVER BOTTOM DECK BAFFLE AIR BRACKET MOUNTING CRI AND R2 BRACKET MOUNTING BOTTOM DELETE FOR OPTIONS 010 AND 030 BRACKET MOUNTING TOP DELETE FOR OPTIONS 010 AND 030 BRACKET JOINING KIT RACK MOUNT CONNECTOR R 8 P 50 FEMALE CONTACT HOOD CONNECTOR SCREW PAN HD POZI DR 4 40 X 0 538 LG R VAR COMP 100 OHM 105 LIN 1 2w FREQ OFFSET CONTROL KNOB KNURLED R VAR COMP 100 OHM 10 LIN 1 2W TRACKING CONTROL R FXD FLM 56 2K OHM 1 1 8W R VAR WW LOK OHM 10 LIN 24 COARSE TUNE CONTROL OPT 020 amp 030 KNOB DIAL COARSE TUNE R VAR WW LOK OHM 10 LIN 24 FINE TUNE CONTROL 020 P 0301 KNOB DIAL FINE TUNE SWITCH PUSHBUTTON DPDT 06 SWITCH ROTARY MODE SWITCH 020 amp 030 MODE OPTION 030 KNOB DIAL MODE OPTION 020 TRANSFORMER POWER 50 60 HZ TERMINAL STRIP 2 INSULATED 1 GROUND CABLE ASSY RF
74. Vdc Output 103 5 115 126 5 4 Set ac line voltage to 115 volts Adjust A2R5 for 19 5 Vdc 20 mV at A2TP1 Measure and record the dc levels at test points locations listed below Location Normal Actual 4 pin 1 40 Vdc A2 pins 9 K 23 Vdc 10 Note The 40 Vde supply will vary from approximately 40 with the Yig Filter tuned to 2 GHz to 30 Vdc at 18 GHz 5 If the dc supplies are out of tolerance refer to Service Sheet 6 for trouble isolation procedure 5 9 Pre Driver Checks and Adjustments REFERENCE Service Sheet 3 DESCRIPTION With the Preselector connected to the Spectrum Analyzer the Pre Driver is checked and adjusted for an output voltage that tracks the tuning response of the Spectrum Analyzer Operational amplifiers 101 A1U2 and 103 are adjusted for null and checked for correct gain Gain controlled by fixed precision resistors Resistors A2R26 and A2R28 are adjusted for an offset voltage corresponding to 550 or 2050 MHz first IF of the Spectrum Analyzer All voltage measurements are made referenced to ground test point 2 5 2 Model 8445 Adjustments ADJUSTMENTS 5 9 Pre Driver Checks and Adjustments cont d SPECTRUM DIGITAL MULTIFUNCTION ANALYZER VOLTMETER UNIT TO AITP2 amp 2 NOTE See Figure 8 5 for adjustment and test point locations Figure 5 2 Pre Driver Check and Adjustment Test Setup EQUIPMENT Spectrum Analyzer HP 8555A 8
75. ack a selected analyzer RF tuning response virtually eliminating multiple image and spurious responses CAUTION Installation of a coaxial attenuator or a coaxial isolator at the Preselector input FILTER PORT is recommended when operating with signal sources that are not capable of absorbing their own reflected power Signals outside the passband of the Preselector are reflected back to the source 3 13 Multiple responses occur when the local oscillator harmonics cause more than one display for a single input frequency For example when 9 5 GHz signal is fed to the analyzer RF INPUT responses due to the 2 3 4 and 5 mixing modes appear on the display see Figure 3 7 Follow the signal frequency line for 9 5 GHz across the figure noting the intersections with solid lines representing mixing modes The Preselector tracks the selected mixing mode so that responses from other mixing modes are not present on the display 3 1 Operation Model 8445A FRONT PANEL 8448A AUTOMATIC PRESELECTOR r LINE ON OFF Controls primary power Light glows when switch is energized Type A1H bulb o PRESELECTOR INSERTION LOSS Chart Indicates 3 2 insertion loss versus frequency Calibration chart extrapolated from point to point measurements of Yig filter insertion loss during final tests FREQ OFFSET control adjusted for minimum insertion loss at each test point During power level measurement the Spectrum
76. added to the driver circuit Figure 8 13 is a SERVICE SHEET 4 cont d simplified drive circuit with one breakpoint For a voltage input smaller than V1 the breakpoint diode CR9 is off and all of the current flowing into the summing junction goes through R3 and R4 When the voltage input exceeds the diode conducts causing some current to flow through R28 This demands more current to flow through R6 which raises the voltage at TP3 An increase in voltage at increases the Yig coil current A3CR8 and ASCR7 Figure 8 15 successively conduct as V increases goes more negative At the voltage where the diodes conduct breakpoints are created and the slope of the curve following it is adjustable by varying the 20K resistors A3R21 24 and 29 Breakpoint adjustment procedures are contained in paragraph 5 11 matched operation with analyzer and 5 12 linear operation Figure 8 11 Simplified Yig Driver Circuit RM RI 1000 3160 Figure 8 12 Simplified Temperature Compensation Circuit SERVICE SHEET 4 TROUBLESHOOTING PROCEDURE YIG DRIVER ASSEMBLY A3 When a malfunction has been isolated to the isolate a malfunction in the Yig Driver perform Connect Preslector to Analyzer apply power and for equipment to warm up and stabilize Make all reference to 2 common ground point EQUIPMENT REQUIRED 8555A Spectrum Analyzer HP8 Digital Voltmeter mn 9 VOLT IF OFFSET SUPPLY S
77. amplifier remote control amplifier and the automatic switching control circuitry COAXIAL SWITCH DRIVER The coaxial switch driver provides control voltage to coaxial relays to connect either the Yig filter or the low pass filter to the front panel ports The coaxial relays are the latching type but are continuously driven in one direction or the other The direction depends on the applied voltage polarity In the AUTO MODE of operation A2Q2 and diodes CR10 CR13 perform the logic for the coaxial switch driver The coaxial relays are driven to the Yig filter position unless all four of the Band Code bits A B D and E are in the logic 0 state If the inhibit lineis grounded or the MODE switch is in MANUAL or REMOTE the coaxial relays are driven to the Yig filter position If the LOW PASS line is grounded the relays are driven to the low pass filter position Transistors A2Q4 thru A2Q8 function as a double pole double throw switch driven by A2Q3 A2Q4 functions as an inverter driving switch A2Q6 Q8 to produce a voltage opposite that provided by switch A2Q5 Q7 The voltage output at the emitters of A2Q5 Q7 and A2Q6 Q8 is always at either 0 or 40 volts When the output of one pair is high the output from the other pair is low The 40 volts difference between the two outputs is reduced to provide approximately 26 volts drive to the coaxial switches by A2R10 A more positive voltage at A2 pins 8 J drives the switches to the Yig filter pos
78. applied to the Yig Driver Assembly A3 Service Sheet 4 a SWEEP SENSE AND YIG FILTER HYSTERESIS RESET AMPLIFIERS Sweep sense amplifier A1US is triggered by the negative going edge of the sweep input signal when the Analyzer is operating in the PER DIVISION mode In the FULL scan mode the sweep plus tune signal inverted and amplified by A1Q9 Q10 triggers the sense amplifier at the end of the sweep period Amplifier A1US senses the falling edge of the sweep signal and triggers the Yig filter hysteresis reset amplifier A1U4 A1U4 is a saturating amplifier whose output goes to approximately 23 volts during retrace turning on diode A1CRA The resulting current out of the summing junction of amplifier 103 is equivalent to approximately a 4 GHz drop in frequency By lowering the frequency of the Yig filter below the normal SERVICE SHEET 3 cont d starting frequency the hysteresis effect in the magnetic core structure is effectively elirninated LOGIC DECODERS RELAY DRIVERS Transistors A1Q1 through AlQ8 and their associated circuitry perform as logic decoder and relay drivers Band code signals from the Analyzer RF Section are utilized to control switching in the circuits of the harmonic number amplifier the n or amplifier and the IF 550 MHz or 2 05 GHz The input band code is either a 20 volt level or open circuit 12 volts through a high resistance TROUBLESHOOTING PROCEDURE PRE DRIVER ASSEMBLY Al When a malfun
79. ara f 31 Blagnac Tel 61 85 82 29 Telex 51957 GERMANY Hewlett Packard Vertriebs GmbH Berliner Strasse 117 Postfach 560 40 06 Nieder Eschbach Fim 56 Tet 0611 50 10 64 Cable HEWPACKSA Frankturt Telex 41 32 49 FRA Hewlett Packard Veririebs GMbH Wilmersdorter Strasse 113 114 0 1000 Berlin W 12 Tel 0311 3137046 Telex 18 34 05 Hewlett Packard Vertriebs GmbH Herrenbergerstiasse 110 07030 Boblingen Wurttemberg Tel 07031 66 72 86 Cable HEPAG B blingen Telex 72 65 739 Hewlett Packard Vertriebs GmbH Voyelsanger Weg 38 04 Dusse dort Jel 0211 63 80 31 35 Telex 85 86 533 Hewlett Packard Vertriebs GmbH Wendenstr 23 02 Hamburg 1 Tel 0411 24 05 51 52 Cable HEWPACKSA Hamburg Telex 21 53 32 CEYLON United Electricats Ltd P O Box 681 Yahala Building Staples Street Colombo 2 5496 Cable HOTPOINT Colombo CYPRUS Kypronics 19 Gregorios amp Xenopoulus Road 1152 Nicasia fel 6282 75628 Cable HE I NAMI ETHIOPIA African Salespower amp Agency Private Lld Co 0 Box 718 58 59 Cunningham 51 Addis Ababa Tel 12285 Cable ASACO Addisababu HONG KONG Schmidt amp Co Hong Kong ttd 0 Box 297 1511 Prince s budding Floor 10 Chater Road Mong Kong Tel 240168 232735 Cable SCHMIDTCO Hong Kune INDIA Blue Star Ltd Buildings Jamshedyi Tata Rd Bombay 208R india Tel 29 50 21 Telex 2156 Cable BLU
80. ch as an awl or twist drill for this purpose Sharp objects may damage the plated through conductor d After soldering remove excess flux from the soldered areas and apply a protective coating to prevent contamination and corrosion 8 22 Component Replacement The following procedures are recommended when component replacement is necessary a Remove defective component from board b If component was unsoldered remove solder from mounting holes with a suction device or a wooden toothpick c Shape leads of replacement component to match mounting hole spacing Model 8445 Service Table 8 3 Schematic Diagram Notes SCHEMATIC DIAGRAM NOTES Refer to USAS Y32 2 1967 Resistance is in ohms capacitance is in microfarads and inductance in millihenries unless otherwise noted P O part of Asterisk denotes a factory selected value Value shown is typical Capacitors may be omitted or resistors jumpered Screwdriver adjustment Panel control Encloses front panel designations Encloses rear panel designation Circuit assembly borderline Other assembly borderline Heavy line with arrows indicates path and direction of main signal Heavy dashed line with arrows indicates path and direction of main feedback Wiper moves toward CW with clockwise rotation of control as viewed from shaft or knob Numbers in stars on circuit assemblies show locations of test points Encloses wire color code Code used MI
81. cket Kit Model 8445A 1 6 Figure 1 4 RF Interconnect Cable 8445A Installation SECTION II INSTALLATION 2 1 INITIAL INSPECTION 2 2 Mechanical Check 2 3 Check the shipping carton for evidence of damage immediately after receipt If there is any visible damage to the carton request the carrier s agent be present when the instrument is unpacked Inspect the instrument for physical damage such as bent or broken parts and dents or scratches If damage is found refer to paragraph 2 6 for recom mended claim procedures If the instrument appears to be undamaged perform the electrical check see paragraph 2 4 The packaging material should be retained for possible future use 2 4 Electrical Check 2 5 The electrical check consists of following the performance test procedures listed in Section IV These procedures allow the operator to determine that the instrument is or is not operating within the specifications listed in Table 1 1 The initial performance and accuracy of the instrument are certified as stated on the inside front cover of this manual If the instrument does not operate as specified refer to paragraph 2 6 for the recom mended claim procedure 2 6 CLAIMS FOR DAMAGE 2 7 If physical damage is found when the instru ment is unpacked notify the carrier and the nearest Hewlett Packard Sales Service office im mediately The Sales Service office wil
82. cont d 24 If voltage levels are not within tolerances repeat test procedure Refer to Service Sheet 3 for troubleshooting procedure 25 Set switch 51 to OPR position 5 10 Remote Amplifier Check and Adjustment REFERENCE Service Sheet 5 DESCRIPTION The remote amplifier A2U3 is adjusted for null common mode and differential mode The adjustments are repeated until settings are found that satisfy null common mode and differential mode requirements DIGITAL MULTIFUNCTION DC POWER VOLTMETER UNIT SUPPLY 2 5 TO REMOTE SHIELD TO A2TP4 TO A3TP2 NOTE 8445 See Figure 8 5 for adjustment Figure 5 3 Remote Amplifier Check and Adjustment Test Setup EQUIPMENT Power Supply 0 10 ee HP 6205B Coaxial Cable BNC to alligator 10501 Four foot test leads with alligator clips 2 Digital Voltmeter with 3484A Multifunction Unit HP 3480B 1 With test setup as indicated in Figure 5 3 apply power to Preselector and allow at least 30 minutes for equipment to stabilize Connect terminal of power supply to A3TP2 Connect terminal of power supply to REMOTE connector shield pv ee de Connect terminal of digital voltmeter to A2TP4 5 Connect terminal of digital voltmeter to A2TP5 6 Set power supply output voltage to zero 5 5 Adjustments Model 8445A
83. ction has been isolated to the Pre Driver Assembly Al or to isolate a malfunction in the assembly perform the following procedure Connect Preselector to Analyzer apply power and allow at least 30 minutes for equipment to warmup and stabilize Make all voltage measurements in reference to A3TP2 common ground point EQUIPMENT REQUIRED 8555A Spectrum Analyzer HP 8555A 8552 140 Digital Voltmeter HP 3480B 3484A Oscilloscope HP 180A 1801A 1821A m HARMONIC NUMBER AMPLIFIER Set switch 151 to test position Measure at A1TP2 for a level of 0 Vdc 1 mV Set switch 151 to operate position Connect voltmeter to 1 1 Select n 1 550 MHz IF BAND and ZERO SCAN WIDTH on Spectrum Analyzer Adjust analyzer FREQUENCY control for an indicated voltage level of 5 000 Vdc 1 mV at 1 1 Connect voltmeter to 1 2 and check for a level of 2 000 Vdc 2 mV Select analyzer bands n 2 and check for a level of 4 000 Vdc 3 mV 3 for 6 000 Vdc 4 mV and 4 for 8 000 Vdc 5 mV Amplifier 101 gain n x 0 4 with controlled by Logic Decoder Relay Drivers see 6 below See paragraph 8 30 for Operational Amplifier troubleshooting procedure If voltages are out of tolerance see paragraph 5 9 for adjustment procedure n or AMPLIFIER Set Yig Driver Assy switch A3S1 to test position and check voltage at test point 1 4 for a level of 0 Vdc 1 mV Set switch A3S1 to operat
84. ding No 59 Kotori cho Nakamura ku Nagoya City Tel 052 551 0215 Yohogawa Hewilett Packard Ltd Nitto 2300 Shinohara cho hohoku Yokohama 222 Tel 409 432 1504 5 KENYA Kenya Kinetics Box 18311 Nairobi Kenya Tel 57726 Cable PROTON KOREA Amencan Trading Korea Ltd Seuut PU Bux 1103 Jih amp Bih floors DueKyuny Bldg 10 Seyong Ro Chungty Ku Seoul Tel 75 5841 14 tines AMTRACO LEBANON Conslantin Macridis Clemenceau Street P O Box 7213 Beirut 220846 Cable ELECTRONUCLEAR Beirut MALAYSIA MECOMB Malaysia Ltd 2 Lorong 13 6A Section 13 Petaling Jaya Selangor Cable MECOMB Kuala Lumpur MOZAMBIQUE Goncalves LDA 3 1 Apt 14 D tuis P O 107 Lourenco Marques Cable NEGON NEW ZEALAND Hewlett Packard iN Z Ltd 94 96 Dixson St P O 9443 Wellington 2 lel 56 559 Cable HEWPACK Wellington Packard N Zo Lig 51092 Puhuranga Tei 573 733 HEWPACK Au kland SWEDEN Hewlett Packard Sverige AB Enighetsvagen 1 3 Fack 161 20 Bromma 20 Tel 08 98 12 50 Cable MEASUREMENTS Stockholm Teter 10721 Hewlett Packard Sverige Hagakessgatan 9C 5 431 41 Molndal Tel 031 27 68 00 Telex 21 312 hpnitndi SWITZERLAND Hewlett Packard Schweiz AG Zurcherstrasse 20 CH 8952 Schlieren Zurich Tel 051 98 18 21 24 Cable HPAG Veter 53933
85. djustable compo nents other than front panel operating controls are listed in Table 8 2 Adjustment procedures for these components are contained in Section V of this manual Table 8 1 Factory Selected Components A3R5 Yig Driver Center TRACKING control 8 1 Service Model 8445A Table 8 2 Adjustable Components n or Amplifier Summing Amplifier Power Supply Yig Driver Yig Driver Yig Driver Yig Driver 8 16 Servicing Aids on Printed Circuit Boards Servicing aids on printed circuit boards include test points transistor designations adjustment callouts and assembly part numbers with alpha numerical revision information 8 17 Part Location Aids The location of chassis mounted parts and major assemblies are shown in Figures 8 4 and 8 5 8 18 The location of individual components mounted on printed circuit boards or assemblies are shown on the appropriate schematic The part reference designator is the assembly designation plus the part designation Example A1R1 is R1 on the A1 assembly For specific component description and ordering information refer to the replaceable parts table in Section VI 8 19 Diagram Notes Table 8 3 Schematic Dia gram Notes provides information relative to symbols and values shown on schematic diagrams 8 20 GENERAL SERVICE HINTS 8 21 The etched circuit boards used in Hewlett Packard equipment are the plated through type co
86. e position and select n 1 550 MHz IF BAND on analyzer Check voltage level at A1TP4 for 9 0 0 3 Vdc Switch analyzer to 1 550 MHz IF BAND Check for a 9 0 0 3 Vdc level at 1 4 Switch analyzer through BANDS 1 to n 4 Voltage readings should be within 2 mV with a positive polarity on n bands and negative polarity on n bands Amplifier 102 gain 1 with polarity controlled by Band Code bit E See Logic Decoder Relay Drivers item 6 below See paragraph 8 30 for Operational Amplifier troubleshooting procedure If voltages are out of tolerance see paragraph 5 9 for adjustment procedure SERVICE SHEET 3 cont d IF 550 MHz 205 GHz NETWORK AND SUMMING AMPLIFIERS Set switches 151 and A3SI to test position Measure voltage at A1TP3 for a level of 0 Vdc 1 mV Set switches A1S1 and A3S1 to operate position and connect voltmeter to A1TP1 Set analyzer to 1 550 MHz IF ZERO SCAN WIDTH and adjust FREQUENCY for a voltage level indication of 5 000 volts A1TP1 Measure voltage at 1 for an indicated level of 1 463 Vdc 2 mV Select n 1 550 MHz IF BAND and check for an indicated voltage level of 2 536 Vdc 2 mV at A1TP3 Select n 2 BAND and check for an indicated voltage level of 2 000 Vdc 2 mV at A1TP3 Select n 2 BAND and check for an indicated voltage level of 6 000 Vdc 3 mV at A1TP3 The 550 MHz or 2 05 GHz IF offset is controlled by Band Code
87. ed Components YIG Driver Center TRACKING control R2 Center 18 GHz adjust A3R21 Center 15 GHz adjust A3R24 YIG Driver YIG Driver Add R19 100 in parallel with R8 2 675 Change R23 61 9K to R23 51 1K Change R26 to R26 08445 90002 08443 40005 08443 40002 08445 00028 08445 00007 08445 00024 08445 00014 08445 00025 08445 00017 08445 00026 08445 00018 08445 00027 08445 00019 5060 8543 5060 0216 5060 8739 5060 0774 0811 3243 0757 0401 0757 0458 0757 0460 Model 8445A gt CHANGE 3 Page 6 4 Table 6 2 Change A2R10to 0764 0013 Page 8 19 Figure 8 19 _ Change R10 100 to R10 56 R FXD MET OX 56 OHM 5 2 W 08445 90002 28480 0764 0013 HEWLETT PACKARD ELECTRONIC INSTRUMENTATION SALES AND SERVICE UNITED STATES CENTRAL AND SOUTH AMERICA CANADA ALABAMA P O Box 4207 2003 Byrd Spring Road SW Huntsville 35802 Tel 205 881 4591 810 726 2204 ARIZONA 2336 Magnolia St Phoenix 85034 Tel 602 252 5061 TWX 910 951 1330 5737 East Brcadway Tucson 85716 Tel 602 298 2313 TWX 910 952 1162 CALIFORNIA 1430 East Orangethorpe Ave Fullerton 32531 Tei 714 870 1000 3939 Lankershim Bouievard North Hollywasd 31604 Tel 72131 877 1282 TWX 910 499 2170 1101 Embarcadero Road Pale Alto 34303 Tel 415 327 5500 TWX 910 373 1280 2220 Watt Ave Sacramento 95825 Tel 1916 482 1463 TWX 910 367 2092 9606 Aero Drive San D
88. ee HP 432A Thermistor Mount 2 HP 8478B 0 6205B Signal Generator 8616B 10 dB Attenuator 8491 1 Connect test setup as indicated in Figure 4 4 and make the following control settings PRESELECTOR LINE OEFF ON Pete a Roy Bea ON POWER SUPPLY IE 1 8 Vdc Performance Tests Model 8445A PERFORMANCE TESTS 4 17 Limiting Level cont d SIGNAL GENERATOR GINES X40 t o a gan mw Wut A ne BEEN On ety Ey P Re ae ts E On ACC cane eh anes Sh a Sorc wis Fx Bote me mam Ge Tea poten On FREQUENCY 022551 dliox Qc 1800 MHz POWER uut oe Roden Be WE Se Sea xa as ON RANGE 5 dBm MOUNT RESISTANCE 2002 2 Adjust Signal Generator output level for an indication of 5 dBm on Power Meter 3 Connect Signal Generator output through the 10 dB attenuator to FILTER PORT on Preselector 4 Connect Power Meter and Thermistor Mount to second FILTER PORT on Preselector Adjust Power Supply Fine Voltage control for maximum power level indication on Power Meter 6 Adjust Preselector FREQ OFFSET control for maximum power level indication on Power Meter Note I
89. elsinki 12 Tel 13 730 HEWPACKOY Helsinkt Yelex 12 1563 FRANCE Hewlett Packard France Quartier de Courtaboeut Boite Postale No 6 F 91 Orsay Tel 1 920 88 01 Cable HEWPACK Orsay Telex 60048 ANGOLA Telectia Empresa Teena de Equipamentos El ctricos SAR Rua de Barbosa Rodrigues 42 0 Box 6487 Luanda Cable tuanda AUSTRALIA Hewlett Packard Australia Pty Ltd 22 26 Weir Street Glen Iris 3146 Victoria Tel 20 L471 6 Hines Cable HEWPARD Melbourne Telex 31024 Hewlett Packard Australia Pty Ltd bl Alexander Street Crows Nest 2065 New South Wales Tel 43 7866 Cable Sydney Telex 21561 Hewlett Packard Australia Pty ita Y7 Churchili Road Prospect 5082 Australia let 65 2366 Cable HEWPARD Adelaide Hewlett Packard Australia Pty Ltd 2nd Floor Suite 13 Casablanca Buildings 196 Adelaide Terrace Perth W A 6000 Tel 21 3330 Cable HEWPARO Perth MHewiett Packard Australia Pty Ltd 10 Wootlev Street PO 191 Dickson A C T 2607 lel 49 8194 Cable HEWPARD Canberra ACT Hewlett Packard Australia Pty Ltd 75 Sunpsons Road Bardon Queensland 4068 lei 30 5411 HEWLETT PACKARD ELECTRONIC INSTRUMENTATION SALES AND SERVICE EUROPE AFRICA ASIA AUSTRALIA Hewlett Pachaid France 4 Quai des F 69 Lyon 5 me Tel 78 42 63 45 Cable HEWPACK Lyon Telex 31617 Hewlett Packard France 29 rue de la G
90. eration in structions for the HP 8445A Automatic Preselec tor Front and rear panel controls connectors and indicators for the basic model Preselector are iden tified and described in Figures 3 1 and 3 2 Front panel controls connectors and indicators for the HP 8445A Option 020 Automatic Preselector are identified and described in Figure 3 3 Operational adjustments are detailed in Figure 3 4 and 3 5 Additional operating information is contained in Figures 3 6 through 3 10 3 3 PANEL FEATURES 3 4 Front and rear panel features of the 8445 Automatic Preselector are described in Figures 3 1 and 3 2 Front and rear panel views of the Preselec tor connected to the HP 8555A 8552A 141T Spectrum Analyzer are shown in Figures 3 4 and 3 5 For a detailed description of the Spectrum Analyzer controls and indicators refer to the appropriate operating and service manuals for those instruments Interconnection wiring between the Preselector and the Spectrum Analyzer is con tained in Section VIII of this manual 3 5 OPERATOR S CHECKS 3 6 Upon receipt of the instrument or when the Preselector is to be used with a different analyzer perform the operational adjustment procedures listed in Figure 3 5 This procedure corrects for minor differences between the Preselector and the Spectrum Analyzer Additionally some improve ment can be made in Preselector tracking with a particular analyzer by matching the Yig filter tuning with the ana
91. es are available for modules that are not field repairable In addi tion repaired exchange modules are available for major sub assemblies as an alternate method of repair The factory repaired modules are available at a considerable savings in cost over the cost of a new module 8 13 These exchange modules should be ordered from the nearest Hewlett Packard Sales Service office using the part numbers in the replaceable parts table in Section VI of this manual Virtually all orders for replacement parts received by HP offices are shipped the same day received either from the local office or from a Service Center 8 14 Factory Selected Components Some com ponent values are selected at the time of final checkout at the factory Usually these values are not extremely critical they are selected to provide optimum compatibility with associated com ponents These components which are identified on the schematics with an asterisk are listed in Table 8 1 The recommended procedure for re placing a factory selected component is as follows a Try the original value then perform the test specified in Section V of this manual for the circuit being repaired b If the specified test cannot be satisfac torily performed try the typical value shown in the parts list and repeat the test c If the test results are still not satisfactory substitute various values until the desired result is Obtained 8 15 Adjustable Components A
92. et switch A3S1 to TEST position and check for a volts at TP junction of A3R10 and A3CR5 check A3R10 and A38CR5 If voltage is correct circuit wiring YIG DRIVER TROUBLESHOOTING Set Analyzer controls as follows BAND ohio 1 FREQUENCY 22555002 uon SCAN WIDTH SCAN TIME 10M SCAN MODE On Preselector check fuse A3F1 Connect digital v Make all voltage measurements in reference to test ground Voltage level at test point F should be Set Analyzer BAND to n 4 and tune FREQUEN Voltage level at test point F should indicate appr there is no change in voltage level between the 1 5 ar points check the input level at pins 2 and 3 of A3U1 between the level at pin 2 and at pin 3 should not ex stage consisting of A3U1 A3Q2 Q3 Q4 and their function as a single operational amplifier The norm 10 mV at the input to 301 is determined by the A3R7 Amplifier A3U1 can be isolated from the removing fuse A3F1 and then connecting a jumper f of A3CR3 to test point Repeat voltage m 301 If voltage level differs by more than 25 mV t If has little or no effect replace 1 for open or shorted transistor or diode in the dri transistor or diode will normally cause fuse A3F1 to Model 8445A Pio 0 POWER INTERCONNECT P O YIG PIO INTERCONNECT BOARD A5 YIG DRIVER ASSY 08456000 SUPPLY ASSY A2 BOARD AS FILTER ASSY A4
93. ett Packard 6 3 Table 6 2 lists 8445A replaceable parts in alpha numerical order of their reference designa tion 6 4 Table 6 3 lists code number identification of manufacturers Manufacturer s code and part number are supplied for each part listed in Table 6 3 M d H H Hl f H H H l og f H H l 6 5 ORDERING INFORMATION Replaceable Parts 6 6 To obtain replacement parts address order or inquiry to your local HP Sales and Service office see list at rear of manual for address Identify parts by their HP part number 6 7 To obtain a part that is not listed include a b o d Instrument model number Instrument serial number Description of the part Function and location of the part Table 6 1 Reference Designators and Abbreviations used in Parts List assembly motor battery capacitor coupler diode delay line device signaling lamp misc electronic part amperes automatic frequency control amplifier beat frequency oscilla tor beryllium copper binder head bandpass brass backward wave oscilla tor counterclockwise ceramic cabinet mount only coefficient common composition complete connector cadmium plate cathode ray tube clockwise deposited carbon drive electrolytic encapsulated external farads flat head Fillister head fixed giga 109 germanium glass ground ed Won H H N H H H H M N wg H H REFE
94. fix numbers NOTE For Preselectors having serial numbers 1119A00110 and below see Section VII Manual Changes Serial Prefixes Not Listed For instruments with serial number prefixes not listed a Manual Changes insert is included with this manual 1971 HEWLETT PACKARD COMPANY Copyright 1501 PAGE MILL ROAD PALO ALTO CALIFORNIA U S A Printed OCT 1971 ul PACKARD Manual Part No 08445 90002 Microfiche Part No 08445 90003 Operating Supplement No 08445 90004 HEWLETT Table of Contents TABLE OF CONTENTS Section Page Section I GENERAL INFORMATION 1 1 PERFORMANCE TESTS cont d 1 1 Introduction 1 1 4 3 Equipment Required 1 5 Instruments Covered by Manual 1 1 4 5 Front Panel Checks 1 7 Description 1 1 4 7 Preset Adjustments 1 9 Options 1 2 4 9 Performance Tests 1 15 Modifications Required 1 3 4 14 Out of Band Rejection 1 17 Test Equipment Required 1 3 4 15 Low Pass Filter Insertion Loss 1 19 Warranty E 1 3 4 16 Yig Filter Insertion Loss 1 21 Accessories Supplied 1 3 4 17 Limiting Level 1 23 Operating Accessories 1 3 V ADJUSTMENTS INSTALLATION 2 1 5 1 Introduction 2 1 Initial Inspection 2 1 5 4 Equipment Required 2 2 Mechanical Check 2 1 5 6 Factory Selected Components 2 4 Electrical Check 2 1 5 8 Power Supplies Check amp Adjustment 4 2 6 Claims for Damage 2 1 5 9 Pre Driver Checks amp Adjustments 2 9 Preparation for Use 2 1 5 10 Remote Amp
95. for a normal operating supply 23 VOLT SUPPLY Remove input line voltage from Preselector Remove A2 assembly from Preselector Check for a short on the 23 volt line external to the power supply Typical resistance to power ground A3TP2 from A5XA2 9 is 4000 ohms A2 assembly removed Check diodes A2CR9 and CR21 for short Check transistors A2Q9 and Q10 for open or shorted condition Check diodes A2CR5 through CR8 and capacitor A2C2 for open or short Install A2 assembly apply power to Preselector Check input to rectifiers A2CR5 thru CR8 Typical voltage level is 88 volts peak to peak Model 8445A Model 8445A pte Co eee sio Diea wam m mme 3 bidis ad MS Lus s Figure 8 20 Power Supply Assembly 2 Component Location SERVICE SHEET 6 ON OFF SWITCH AND POWER LINE MODULE WIRING REAR VIEW P O POWER SUPPLY ASSY 2 08445 60003 GROUND 40V UNREG ul i 0990 I Fl SERIES POWER LINE MODULE A6 B Ie 500 mA REGULATOR 5060 1189 9 971 CRIB a E Em 2 1854 0072 BOTTOM VIEW 39 7V 51 PIS 15 20 115 230 INPUT 50 60 Hz U1 1820 0196 VOLTAGE REGULATOR 2 CR2 CRI icu LL PR POR 27 7V RMS 1901 0200 1 5 AMP N aT 01 a Z CR6 CR5 5 A 4 G CR19 CR20 26 1V 26 1V 1853 4 CRI 1 9 18 21 23 TV C3 19 5V 100 pF ADJ 27 7V RMS
96. g sweep frequency the hysteresis effects in the filter magnetic core structure are effectively eliminated The Summing Amplifier combines the output of the Harmonic Number Amplifier with the output from the 2 05 2 550 MHz IF Offset Network to produce an output voltage level to the Yig Driver that is proportional to the frequency to which the analyzer is tuned The Summing Amplifier has unity gain L with an output voltage level proportional to frequency by a ratio of 1 025 GHz volt DRIVER The input to the Yig Driver is a voltage proportional to frequency by a ratio of 1 025 GHz volt The Yig Driver output is a current that tunes the Yig Filter from 1 8 to 18 GHz The input to the Yig Driver can be supplied from any one of three separate sources the Yig Pre Driver the remote control circuitry or the manual control circuitry Switching is automatic except for instruments with manual controls Refer to Service Sheet 5 for switching information Two front panel controls are associated with the Yig Driver circuitry FREQ OFFSET control corrects for a frequency offset of approximately 255 MHz in the Yig Filter linear current frequency curve The offset is due primarily to the residual magnetism in the core structure TRACKING control corrects for minor variations in circuit component values chosen to give the desired coil current input voltage relationship Temperature compensation is provided by a thermistor installed in the Yig F
97. i 543 4232 523 1874 Telex 0017 74507 NICARAGUA Roberto Ter n G Apartado Postal 689 Edificio Ter n Managua Tel 3451 3452 Cable ROTERAN Managua PANAMA Eiectr nico Baiboa S A 4929 Ave Manuel Espinosa 13 50 Bigg Alina Panama City Tet 230833 Teiex 3481003 Curundu Canal Zone Cable ELECTRON Panama City CANADA MANITOBA Hewlett Packard Ltd 511 Bradford Ct Winnipeg Tel 1204 786 7581 TWX 610 671 3531 NOVA SCOTIA Hewlett Packard Canada Ltd 2735 Dutch Village Rd Suite 206 Halifax Tei 902 455 0511 TWX 610 271 4482 OHIO 25575 Center Ridge Road Cleveland 44145 Tel 216 835 0300 TWX 810 327 9129 3460 South Dixie Drive Dayton 15439 Tel 513 298 0351 TWX 810 453 1925 1120 Morse Road Columbus 43229 Tel 614 846 1300 OKLAHOMA 2919 United Founders Soule ard Okiahoma City 73112 Tel 405 848 2801 TWX 319 830 6862 OREGON Westhills Mali Suite 158 4475 S W Schails Ferry Road Portland 37225 Tel 503 292 9171 TWX 910 464 6103 PENNSYLVANIA 2500 Moss Side Boulevard Monroeville 15146 Tet 412 271 0724 TWX 710 797 3650 1021 8th Avenue King of Prussia Industrial Park Xing of Prussia 19406 Tet 215 265 7000 TWX 510 660 2670 RHODE ISLAND 873 Waterman Ave East Providence 02914 Tel 401 434 5535 TWX 710 382 7573 TEXAS 1270 201 Arapaho Rd Richardson 75080 Tel 214
98. iego 92123 Tel 714 279 3200 TWX 310 335 2000 COLORADO 7965 East Prentice Englewood 80110 Tel 303 771 3455 TWX 910 935 0705 ARGENTINA Hewlett Packard Argentina 5 6 1 tavalle 1171 37 Buenos Aires Tel 35 0436 35 0627 35 0431 Tetex 012 1009 Cable HEWPACKARG BRAZIL Hewlett Packard Do Brasil Ltda Rua Frei Caneca 1119 Sao 3 SP Tel 288 7111 287 5858 Cable HEWPACK Sao Paulo Hewlett Packard Do Brasil Praca Dom Feliciano 78 Salas 806 808 Porto Afegre Rio Grande do Sul RS Brasil Tel 25 8470 Cable HEWPACK Porto Alegre Hewlett Packard Do Brasil ted Ltda Rua da Matriz 29 Botafogo 26 02 Rio de Janeiro Tel 246 4417 Cable HEWPACK Ria de Janeiro ALBERTA Hewlett Packard Canada Ltd 11745 Jasper Ave Edmonton Tet 403 382 5561 TWX 610 831 2431 CONNECTICUT 508 Toltand Street fast Hartford 06108 Tel 203 289 9394 TWX 710 425 3416 111 East Avenue Norwalk 06851 Tel 1203 853 1251 TWX 710 468 3750 FLORIDA PO Box 24210 2806 W Oakland Park Blvd Ft Lauderdale 33307 Tel 305 731 2020 TWX 510 955 4099 P O Box 20007 Herndon Station 32814 621 Commonwaaith Avenue Orlanda Tel 305 842 3970 TWX 810 850 0113 GEORGIA P O 28234 450 Interstate North Atlanta 30328 Tet 404 436 6181 TWX 810 766 4890 ILLINOIS 5500 Howard Street Skokie 60076 fet 1312 677 0400 TWX 310 223 3613 INDIANA 3839 Mead
99. ilter with feedback applied to the Yig Driver input amplifier 9 Volt Reference The Yig Driver Assembly contains 9 volt power supply The 9 volt source is used as a reference by the Pre Driver n or Offset Amplifier 202 MANUAL REMOTE AND SWITCHING CONTROL CIRCUITRY a Manual Control Circuitry Instruments with options 020 or 030 are equipped with manual front panel tuning controls and a mode switch COARSE and FINE tuning controls allow the Yig Filter to be manually tuned over the 1 8 to 18 GHz frequency range The MODE switch provides manual selection of AUTO REMOTE MANUAL or LOW PASS Low Pass Filter operation All instruments contain the manual control amplifier located on the Power Supply Assembly A2 On instruments without manual controls the input and output of the manual control amplifier is left floating Block Diagram SERVICE SHEET 1 Service SERVICE SHEET 1 cont d b Remote Control Circuitry All instruments are equipped with provisions for remote tuning of the Yig Filter by an external voltage source The REMOTE input floating BNC connector on the rear panel has a frequency tuning ratio of 1 GHz volt A remote control amplifier located on the Power Supply Assembly A2 inverts and conditions the remote input voltage to drive the Yig Driver On instruments with options 020 or 030 selection of the REMOTE input is accomplished with the MODE switch Instruments other than options 020 or 030 w
100. in 50 1500 300 1000 1 lt 20 dB 25 50 29 50 30dB 25 dB 4048 10d8 20 d8 Emitter Follower Current Gain Power Gain Service ing methods In addition the emitter lead for bipolar transistors is identified on the printed circuit boards 8 28 OPERATIONAL AMPLIFIERS 8 29 Operational amplifiers are used to provide such functions as summing amplifiers offset ampli fiers buffers and power supplies The particular function is determined by the external circuit connections Equivalent circuit and logic diagrams for type 741 operational amplifiers are contained in Figure 8 3 Circuit A is a non inverting buffer amplifier with a gain of 1 Circuit B is a non inverting amplifier with gain determined by the resistance of R1 and R2 Circuit C is an inverting amplifier with gain determined by R1 and R2 with the input impedance determined by R2 Circuit D contains the functional circuitry and pin connec tion information along with an operational ampli fier review Note In Circuit D it is assumed that the ampli fier has high gain low output impedance and high input impedance 8 30 Operational Amplifier Troubleshooting Procedure Measure and record the voltage level at both the inverting terminal pin 2 and the non inverting terminal pin 3 The level should not differ by more than 10 mV If the voltage level is not within 10 mV check the Transistor Bia
101. ine 6 Set Spectrum Analyzer INPUT ATTENUATION to 0 dB 7 Tune Generator to a frequency 1 GHz above that recorded in step 4 above Record frequency 8 Tune Spectrum Analyzer to frequency of Signal Generator 9 Center Signal Generator signal on CRT display 10 Reduce Spectrum Analyzer BANDWIDTH to 30 kHz and SCAN WIDTH PER DIVISION to 0 5 MHz Center signal on CRT display with FINE TUNE control 11 Set Analyzer INPUT ATTENUATION to 10 dB 12 Note and record signal level Signal should be at least 50 dB below the reference level set in step 5 above Out of Band Rejection 4 15 Low Pass Filter Insertion Loss SPECIFICATION Low Pass Filter Insertion Loss DC 1 8 GHz 2 5 dB 2 05 GHz gt 50 dB DESCRIPTION Insertion loss is measured at the high end of the filter s operating range by applying a known input power level and measuring the output power level Filter rejection at 2 05 GHz is measured in the same manner 4 4 Model 8445A Performance Tests PERFORMANCE TESTS 4 15 Low Pass Filter Insertion Loss cont d SIGNAL GENERATOR SPECTRUM ANALYZER Figure 4 2 Insertion Loss Test Setup DC 1 8 GHz EQUIPMENT Spectrum Analyzer at a Z ee eee 8555 8552 141 Signal Generator 8616 1 Connect test setup as indicated in Figure 4 2 and make the following control settings PRESELECTOR aris w s
102. ired to return the Preselector to peak operating condition when repairs are required Included in this section are test setups checks and adjustment procedures A test card for recording data is included at the back of this section Adjustment location drawings or photographs are contained in the test setup and or the component location figures adjacent to the schematic diagrams in Section VIII 5 3 The adjustment procedures are arranged in numerical order For best results this order should be followed Record data taken during adjust ments in the spaces provided or on the data test card at the end of this section Comparison of initial data with data taken during periodic adjust ments assists in preventive maintenance and troubleshooting 5 4 EQUIPMENT REQUIRED 5 5 Each adjustment procedure contains a list of test equipment for that particular test Table 1 3 contains a tabular list of test equipment and accessories required in the adjustment procedures In addition the table contains the required mini mum specifications and a suggested manufacturer s model number 5 6 FACTORY SELECTED COMPONENTS 5 7 Table 8 1 contains a list of factory selected components by reference designation basis of selection and schematic diagram location on which the component is illustrated Factory selected com ponents are designated by an asterisk on the schematic diagrams in Section VIII of this manual ADJUSTMENTS 5 8 Power S
103. ithout manual controls are automatically switched to REMOTE input when the associated Spectrum Analyzer is turned off or the interconnecting cable between the Preselector and Spectrum Analyzer is removed c Switch Control Circuitry The switch control circuitry consists of the REMOTE switching b above and the coaxial switching circuitry The coaxial switching circuitry is controlled by Band Code signals from the 8555A Spectrum Analyzer RF Section For instruments without manual controls and for instruments with manual controls set to AUTO position ae Code signals determine the selection of the Yig Filter or Low Pass ilter POWER SUPPLY ASSEMBLY A2 Refer to Service Sheet 6 for the 23 19 5 and 40 volt power supplies In addition to the three supplies above a 9 volt supply is required by the Preselector The 9 volt reference supply is located on the Yig Driver Assembly A3 with the schematic diagram shown on Service Sheet 4 8 10 Model 8445A YIG PRE DRIVER CIRCUITS PER DIVISION RETRACE SWEEP SENSE gt AMPL A2US 09 010 INTERFACE ES HARMONIC 1 025GHzIVOLT 1 5 TO 10V 9 a gt A2U1 MMIXING SIGN net MIXING OF AMPL A2U2 9Vdc REFERENCE TROUBLESHOOTING BLOCK DIAGRAM SERVICE SHEET 2 40V 19 5V 23V POWER SUPPLIES SERVICE SHEET 6 IF FREQ SENSE YIG DRIVER CIRCUITS AND MANUAL CONTROL AMPLI
104. ition A more positive voltage at A2 pins 13 P drives the switches to the low pass filter position MANUAL CONTROL BUFFER AMPLIFIER The manual control buffer amplifier A2U2 generates an output voltage proportional to the sum of the dial settings of the COARSE and FINE tune control Manual tune controls are provided on instrument options 020 and 030 The COARSE tune control is calibrated in frequency from 0 to 20 GHz The FINE tune control is calibrated from 500 to 500 MHz A resistive network A2R13 R15 and R16 provides a voltage offset that is equal to 500 MHz With the FINE control centered 0 MHz the offset corrects the input voltage so that the frequency calibration of the COARSE tune control reads correctly Operational amplifier A2U2 is an inverting amplifier with unity gain The output voltage is proportional to frequency by a ratio of 1 025 GHz V Yig driver input sensitivity EH REMOTE CONTROL BUFFER AMPLIFIER The remote input buffer amplifier generates a voltage at A2TP4 equal to the voltage difference on the floating BNC remote input A2U3 and its associated circuitry form a standard instrumentation type differential amplifier A2R20 and R21 are adjusted for unity gain and best common mode rejection Over voltage protection is provided by A2CR15 CR16 and CR17 A2R24 reduces the input sensitivity to a ratio of 1 000 GHz volt The output of the remote amplifier is routed through MODE switch S2 and or the automatic switching c
105. king 0 5 V gate Vertical Input Impedance 75K ohms HP 1416A Swept Fre quency Indicator Directional Coupler 2 each HP 779D Directional Coupler Frequency Range Usable from 2 18 GHz 10 dB Coaxial Attenuator Frequency Range DC 18 GHz HP 8491B Coaxial Attenuator Option 010 Crystal Detector Frequency Range 1 8 18 GHz HP 8470A Crystal Detector Crystal Detector Frequency Range Usable to 18 GHz HP 423A Crystal Detector Adjustments T Troubleshooting P Performance 1 5 General Information 11670A 11670B 11670C 11670D 11670E 11670F 11670G 11670H 11670J 11670K 11670M Table 1 4 Optional RF Interconnect Cables ing Dim Dim Part No Connector Type Mounting Configuration inches inches Preselector below Spectrum Analyzer Preselector below Spectrum Analyzer Preselector above Spectrum Analyzer Preselector above Spectrum Analyzer Preselector below Spectrum Analyzer Rack mounted Preselector below Spectrum Analyzer Rack mounted Preselector above Spectrum Analyzer Rack mounted Preselector above Spectrum Analyzer Rack mounted Preselector below Spectrum Analyzer Joining Bracket Kit Preselector below Spectrum Analyzer Joining Bracket Kit Preselector above Spectrum Analyzer Joining Bra
106. l arrange for repair or replacement without waiting for a claim to be settled with the carrier 2 8 The warranty statement for the instrument is on the inside front cover of this manual Contact the nearest Sales Service office for information about warranty claims 2 9 PREPARATION FOR USE CAUTION Before applying power check the power selector switch on the Preselector input power line module rear panel for proper position 115 or 230 volts 2 10 Power Requirements 2 11 The Preselector can be operated froma 50 to 60 Hertz input line that supplies either 115 or 230 volt 410 in each case power Consumed power is normally less than 65 watts 2 12 The 115 230 power selector switch on the rear panel power line module of the Preselector must be set to agree with the available line voltage The selector switch is located below the fuse holder and fuse extractor lever An arrow on the selector switch points to callouts listing the line input voltage and fuse amperage rating To change the position of the selector switch it is necessary to remove the power cable slide the protective cover to the left and lift the fuse extractor before the switch can be changed With the fuse extractor extended press down and toward the desired direction Replace fuse with a fuse of the amperage rating for the selected position See Section VI for replacement HP Part Numbers The instrument is normally shipped with fuse installed for 115 vo
107. lifier Check amp Adjustment 2 10 Power Requirements 2 1 5 11 Yig Driver Adjustments Matched 2 13 Power Cable 2 1 Operation 2 2 16 Operating Environment 2 1 5 12 Yig Driver Adjustments Linear 2 19 Installation Connections 2 2 Operation 2 22 Storage and Shipment 2 2 2 23 Original Packaging 2 2 VI REPLACEABLE PARTS 2 27 Other Packaging Materials 2 2 6 1 Introduction 6 4 Ordering Information OPERATION 3 1 3 1 Introduction 3 1 MANUAL CHANGES 3 3 Panel Features 3 1 7 1 Current Instruments 3 5 Operator s Checks 3 1 7 3 Older Instruments 3 7 Operating Instructions 3 1 1 5 Newer Instruments 3 9 Controls Indicators and Connectors 3 1 3 11 Spectrum Analyzer Preselection 3 1 VIII SERVICE 3 16 Preselector Bandwidth 3 11 8 1 Introduction 3 18 Recommended Frequency Ranges 3 11 8 3 Principles of Operation 3 20 Yig Filter 210 Mode 3 12 8 5 Recommended Test Equipment 3 22 Preselector Tracking with Spectrum 8 7 Troubleshooting a Analyzer 3 12 8 11 Repair 3 25 Preselector Tracking Manual 8 20 General Senice Hints Operation 3 13 8 23 General Service Information 8 28 Operational Amplifiers IV PERFORMANCE TESTS 4 1 8 31 Electrical Maintenance 4 1 Introduction 4 1 8 33 Mechanical Maintenance LIST OF ILLUSTRATIONS Figure Page Figure 1 1 Model 8445A and Accessories 1 0 35 Operational Adjustments 1 8 to 18 GHz 1 2 Instrument Identification 1 1 3 6 Yig Filter Remote Operation 1 8
108. lt operation 2 13 Power Cable 2 14 To protect operating personnel the National Electrical Manufacturers Association NEMA and the International Electrotechnical Commission IEC recommends that the instrument panel and cabinet be grounded The Preselector is equipped with a three conductor power cable the third conductor is the ground conductor and when the cable is plugged into an appropriate receptacle the instrument is grounded To preserve the protection feature when operating the instrument from a two contact outlet use a three prong to two prong adapter and connect the green or green yellow lead on the adapter to ground 2 15 Power cables are selected for shipment with each instrument with a line connector plug to match the standard power cord for the country of destination on the purchase order A label indicat ing the power cable inside is affixed to the packing case Figure 2 1 indicates the connector plugs and the HP part numbers for the various available power cables 2 16 OPERATING ENVIRONMENT 2 17 A forced air cooling system is used to main tain required operating temperatures within the instrument The air intake and filter are located on the rear of the instrument warm air is exhausted through the side panel perforations When opera ting the instrument choose a location which pro 2 1 Model 8445A Operation SECTION III OPERATION 3 1 INTRODUCTION 3 2 This section provides complete op
109. lyzer tuning See Preselector Tracking paragraph 3 22 and Yig Driver Adjust ment paragraph 5 11 3 7 OPERATING INSTRUCTIONS 3 8 General operating instructions are contained in Figures 3 4 and 3 5 These instructions will familiarize the operator with basic operating func tions of the Preselector in use with the Spectrum Analyzer Additional operating techniques and in formation are contained in Figures 3 6 through 3 10 3 9 CONTROLS INDICATORS AND CONNECTORS 3 10 Front and rear panel controls indicators and connectors are identified and briefly described in Figures 3 1 through 3 3 Operational adjustment procedures are given in Figures 3 4 through 3 6 Additional information to assist the user during instrument operation is given in the following paragraphs 3 11 SPECTRUM ANALYZER PRESELECTION 3 12 The 8555A Spectrum Analyzer RF Section has a 2 05 to 4 1 GHz local oscillator and a 2050 or 550 MHz first IF The analyzer responds to signals within the 10 MHz to 18 GHz range when using internal mixing In some cases the open front end and harmonic mixing of the analyzer present problems of signal interpretation The Preselector is used to eliminate unwanted responses on the CRT display The Preselector uses a low pass filter over the frequency range of dc to 1 8 GHz and a Yig filter as a microwave resonator in the RF signal path over the frequency range of 1 8 to 18 GHz The Yig filter is electronically tuned to tr
110. m d ANALYZER BAND 20 sche Sed Ee ORE b uh ente 1 2 05 GHz IF EREQUENGCY eS tr ee oe 1 8 GHz BANDWIDTH as sto Bod ma Ek SNS Oe RD 300 kHz SCAN WIDTH PER DIVISION 10 MHz INPUT ATTENUATION 2202 2 64 eR a BO 10 dB BASE GENE CEIPPE Re ca aaae z oy ok ga ge te ee ei te eS 9 o clock SCAN TIME PER DIVISION 10 MILLISECONDS LOG REF LEVEL 6 4 a ae Saha sb na Bp ee ck Bed 20 dBm LEOGALINEAR 200 50 n9 eem Su 2t W QS Uxor LOG VIDEO BIL PER 10 kHz SCAN MODE ee dt Soe Vhs MD RU dtr INT SCAN TRIGGER s a onr dea Toa vomere e yon We IAE US AUTO POWER xe Cet Geeta hh esu er Lue Ss ON SIGNAL GENERATOR DINE OL 2 m aae de iN el ere On RN On On EREQUENCY 2 525 225 Yer Be un 1800 MHz ATEENUATION suan n wun te a Rhee a Vos ee ae 10 dB 4 5 Performance Tests Model 8445A PERFORMANCE TESTS 4 15 Low Pass Filter Insertion Loss cont d 2 Center 1 8 GHz signal on CRT display with FREQUENCY control Set TUNING STABILIZER to ON and reduce SCAN WIDTH PER DIVISION to 100 kHz Center signal on CRT display with FINE TUNE control 3 Adjust Signal Generat
111. m FILTER PORTS Measure resistance to ground from center pin of each FILTER PORT Normal indication less than 0 2 ohms On Preselec tors with Low Pass Filter select BAND 1 2050 MHz IF check resistance of filter switches and cabling Resistance from center pin to center pin of FILTER PORTS should not exceed 0 2 ohms Resistance from center pin to ground should indicate infinity TROUBLESHOOTING PROCEDURE 8 12 YES Check Manual and or Automatic Switching cir cuits SS5 NO Compare voltage level at test point ATTP3 with level at test point 4 There should be no dif ference in voltage level in automatic mode of oper ation YES Connect digital voltmeter to test point F Select n 4 BAND ZERO SCAN WIOTH and tune Analyzer from 10 to 18 GHz Voltage level at F shoutd drop from approximately 34 5 to approximately 30 volts NO Check Yig Driver Summing Amplifier and Yig Driver SS4 Model 8445A SERVICE SHEET 2 gi SWEEP SENSE 1 15 XAl 1 PER 1 2 I DIVISION gt SWEEP 8 1 20V I AN HARMONIC 1 NUMBER AMPL 1 SWEEP gt 1 1 OPERATE o Q TEST YIG RESET AMPL SUMMING AMPL 1 I TUNE i 0 48 INPUT 19 5V 3 f FROM P erp m 49 5 1 8555 x t BAND 1 COD dise A yy o 4 52 gt CEE BIT D i
112. mbia Central Africa Vel 73793 Cable ARJAYTEE Lusaka MEDITERRANEAN AND MIODLE EAST COUNTRIES NOT SHOWN PLEASE CONTACT Hewlett Packard Correspondence Ottice Piazea Marcon 25 1 00144 Kome Eur Tel b 59 40 29 HEWPACKIT Telex 61514 OTHER AREAS NOT LISTED CONTACT Hewlett Packard INTERCONTINENTAL 3200 Hillview Ave Pato Ally Gautorma 4504 Tel i415 326 7000 feb 71 493 1921 VNX 91053733207 Artu Telex 034 8461 HEWLETT PACKARD HP Part No 08445 90002 PRINTED IN U S A KAXL s This manual is provided FREE OF CHARGE from the BoatAnchor Manual Archive as a service to the Boatanchor community It was uploaded by someone who wanted to help you repair and maintain your equipment If you paid anyone other than BAMA for this manual you paid someone who is making a profit from the free labor of others without asking their permission You may pass on copies of this manual to anyone who needs it But do it without charge Thousands of files are available without charge from BAMA Visit us at http bama sbc edu
113. mon ground point EQUIPMENT REQUIRED Volt Ohm Ammeter HP 412A Oscilloscope HP 180A 1801A 1821A 40 VOLT SUPPLY To check the 40 volt supply remove input line voltage from Preselector and remove fuse A2F1 to isolate the 19 5 volt supply from the 40 volt supply Check diodes A2CR1 thru CR4 and capacitor A2C1 for open or shorted condition Check 40 volt output for short Typical resistance to power ground A3TP2 from 5 2 pin 11 is 2400 ohms with 2 removed Apply power to Preselector and check input to rectifiers A2CR1 thru CR4 Typical voltage level is 90 volts peak to peak Preselector not connected to analyzer Replace fuse A2F1 Power Supplies SERVICE SHEET 6 Service SERVICE SHEET 6 cont d BE 19 5 VOLT SUPPLY Remove input line voltage from Preselector Remove A2 assembly from Preselector Check for a short on the 19 5 volt line external to the power supply Typical resistance to power ground A3TP2 from A5XA2 pin 3 is 1200 ohms A2 assembly removed Check A2CR19 and CR20 for short Check fuse A2F1 and check transistor A2Q1 for open or short Install A2 assembly apply power and check for a 5 11 volt voltage drop across diode A2CR18 Check voltage drop across A2R3 Compare voltage level at A2U1 pin with level at pin 2 Compare voltage level at 2171 pin 3 with level at pin 2 Use junction of A2C3 and A2R2 with circuit traces to A2UI for measurement points Typical voltage levels given
114. nd Accessories 1 of 2 Minimum Specifications Suggested Model Frequency Comb Frequency markers spaced 1 10 100 MHz apart HP 8406A Comb A T Generator Generator usable to 8 GHz Frequency Accuracy 0 01 HP 8616A B Signal P A Generator Output Amplitude gt 40 dBm to 2 GHz Signal Generator Frequency Range 1 8 4 0 GHz Frequency Accuracy 1 Output Amplitude gt 5 dBm Output Impedance 50 ohms Sweep Oscillator Frequency Range 2 0 18 GHz HP 8690B Sweep Oscil Output Amplitude gt 5 dBm lator with Output Impedance 50 ohms 8692B RF Unit 8693B RF Unit 8694B RF Unit 8695A RF Unit Digital Voltmeter Voltage Accuracy of range Resolution 1 mV 10 volts Overrange 50 Input Impedance 10 megohms Polarity Automatic Indication 0 01 of reading 0 01 HP 3480B Digital Multimeter with HP 3484A Multi Function Unit Oscilloscope Frequency Range dc to 50 MHz Time Base 1 us div to 10 ms div Time Base Accuracy 3 Dual Channel Alternate Operation AC or dc Coupling External Sweep Mode Voltage Accuracy 3 Sensitivity 0 005 V div HP 180A with HP 1801A Vertical Amplifier and HP 1821A Horizontal Amplifier HP 10004 10 1 Divider Probes 2 Power Meter HP 432A Power Meter with HP 8478B Thermistor Mount Frequency Range 0 01 18 0 GHz Accuracy 1 Power Range 20
115. ndicated power meter level should correspond with the insertion loss indicated on Preselector calibration label Typically 4 dB below the level established in step 2 above 7 Note and record level indicated on Power Meter dBm 8 Remove 10 dB Attenuator from Signal Generator to Preselector path and install in Preselector to Thermistor Mount and Power Meter path 9 Note and record level indicated on Power Meter dBm 10 Record compression loss difference between levels recorded in steps 9 and 7 above dB 4 10 Model 8445A Table 4 1 Performance Test Card Hewlett Packard Model 8445 Test Performed by Preselector Instrument s Serial No 8445A _ Date 8555 _ 8552 140 Out of Band Rejection Reference Frequency Measurement Frequency Out of Band Rejection Low Pass Filter Insertion Loss Reference Level Insertion Loss 2050 MHz Insertion Loss Yig Filter Insertion Loss Reference Frequency Reference Signal Level Preselector Signal Level Insertion Loss See Specification Reference Frequency Reference Signal Level Preselector Signal Level Insertion Loss Reference Frequency Reference Signal Level Preselector Signal Level Insertion Loss See Specification Limiting Level Reference Frequency Reference Level Measurement Level Compression Loss Performance Tests 4 11 4 12 Model 8445A Adjustments SECTION V ADJUSTMENTS 5 1 INTRODUCTION 5 2 This section describes adjustments requ
116. nsisting of metallic conductors bonded to both sides of an insulating material The circuit boards can be either a single layer or multi layer board The metallic conductors are extended through the component holes or interconnect holes by a plating process Soldering can be performed on either side of the board with equally good results Table 8 4 lists recommened tools and materials for use in repairing etched circuit boards Following are recommendations and precautions pertinent to 8 2 Harmonic Number Amplifier IF 550 MHz 2 05 GHz Network IF 550 MHz 2 05 GHz Network Remote Control Amplifier Remote Control Amplifier Remote Control Amplifier Amplifier null Amplifier null 2050 MHz IF Offset 550 MHz IF Offset Amplifier null 19 5 Vdc Adjust Common Differential Mode null Common Differential Mode null Amplifier null Amplifier null FREQ OFFSET control centering 18 GHz Breakpoint 15 5 GHz Breakpoint 12 5 GHz Breakpoint recommendations and precautions pertinent to etched circuit repair work a Avoid unnecessary component substitu tion it can result in damage to the circuit board and or adiacent components b Do not use a high power soldering iron on etched circuit boards Excessive heat may lift a conductor or damage the board c Use a suction device or wooden toothpick to remove solder from component mounting holes CAUTION Do not use a sharp metal object su
117. ol to LOG Rotate LOG REF LEVEL control to 30 dBm Adjust LOG REF LEVEL Vernier control to position signal peak on LOG REF LEVEL graticule line Connect a 30 dBm 8 0 GHz signal to upper FILTER PORT on Preselector Select n 2 Frequency BAND on Analyzer set SCAN WIDTH PER DIVISION to 10 MHz and tune FREQUENCY control to center the 8 0 GHz signal on CRT display Reduce SCAN WIDTH PER DIVISION to 0 5 MHz keeping signal centered on display with FRE QUENCY control Reduce SCAN WIDTH PER DIVISION to 100 kHz center signal on display with FINE TUNE control Set LOG LINEAR switch to LINEAR and LINEAR SENSITIVITY control to 1 mV DIV Adjust Preselector TRACKING control to maximize signal on CRT display If signal is already at maximum no further adjust ment of FREQ OFFSET or TRACKING is required If signal was not at maximum repeat steps 7 through 22 until a setting is found which satisfies requirements of steps 13 and 22 Figure 3 5 Operational Adjustments 1 8 to 18 GHz 2 of 2 3 9 Operation Model 8445A REMOTE OPERATION SIGNAL SOURCE 1 8 18 GHz negative side of the power source to the coaxial shield The Yig filter output from the other port may be and the positive side to the center conductor connected to an analyzer or power meter POWER METER COAX THERMI STOR MOUN 1 Check that the 115 230V switch is set to correspond OFFSET and TRACKIN
118. on CRT display Note Tuning rate is critical The frequency tuning of the Preselector passband is changed ata rate of 1 MHz mV Adjust FREQ OFFSET to maximize signal level on CRT display Record signal level dBm Subtract level recorded in step 9 B dB Record insertion loss at 4 GHz dB Repeat the above procedure at selected frequency points to 18 GHz Model 8445A Performance Tests PERFORMANCE TESTS 4 17 Limiting Level SPECIFICATION Maximum input level for lt 1 dB signal compression gt 5 dBm DESCRIPTION Yig filter compression is checked at the low frequency end of the operating range point of maximum filter compression Compression is measured by applying a 5 dBm signal to the filter input the power level at the filter output is measured to establish a reference level The input power level is increased by 10 dB and the output level is checked for a corresponding increase In the actual test a 10 dB fixed attenuator is switched from between the signal source and filter to the filter output Using this procedure any change in output level would be due to compression and not to errors in the measurement test setup DC POWER SUPPLY SIGNAL GENERATOR pat Be POWER METER SS UW cs Ge LREMOTE SASA ade a S THERMISTOR MOUNT ATTENUATOR Figure 4 4 Yig Filter Signal Compression Test Setup EQUIPMENT Power Meters Z xn he cee Seg S
119. ontrol see 4 below K AUTOMATIC SWITCHING CONTROL Relay driver A3Q1 and Relay A3K1 provide automatic switching of the Yig driver input for instruments without manual controls For those instruments Std and option 010 20 volts is supplied from the 8555A RF Section SERVICE SHEET 5 cont d through interconnect cable W3 to the base of transistor 391 The 20 volts causes 391 to conduct energizing A3K1 With A3K1 energized the Pre Driver output is routed through contacts 2 and 3 of A3K1 and then through the interconnect wiring to the Yig Driver circuitry When the 20 volts to A3Q1 is removed either the 8555A turned off or W3 interconnect cable disconnected A3K1 de energizes and the output of the remote amplifier is routed through contacts 1 and 3 of to the Driver circuitry Also the inhibit line to the coaxial switch driver 1 above is grounded through contacts 4 and 6 of A3K1 The ground applied to the inhibit line ensures that the Yig Filter is switched in the RF circuit path For instruments with manual controls 19 5 volts is supplied via a jumper between pins 2 and 6 of XA5 This voltage keeps A3Q1 saturated and relay 1 energized removing the ground on the inhibit line to the coaxial switch driver The output from the Pre Driver manual control and remote control amplifiers is routed through MODE switch S2 to the Yig Driver The signal path tc the Yig Driver through A3K1 is broken by removal of a jum
120. oore Kuads PU Bor 99 Overpart Natal Tel 347536 UNITED KINGDOM Hewlett Packard Ltd 224 Bath Road Slough 5114 05 Bucks Tel Slough 0753 33341 Cable HEWPIE Siough 84413 Hewletl Packard Ltd The Graflons Stam ord New Road Altrincham Cheshire Tei 961 928 8626 Telex 668068 YUGOSLAVIA Belram SA 83 avenue des Mimasas Brussels 1150 Belgium Tel 44 34 32 34 26 19 Cable BELRAMEL Brussels Telex 21790 SOCIALIST COUNTRIES PLEASE CONTACT Hewlett Packard Ges m b H Innstrasse 23 2 Postfach A1204 Vienna Austria Tel 222 3366 06 09 Cable HEWPACK Vienna Telex 75923 ALL OTHER EUROPEAN COUNTRIES CONTACT Hewlett Packard S A Rue du Bors du lan 7 1217 Meyrin 2 Geneva Swivenand Tel 022 41 54 00 Cable HEWPACKSA Geneva Telex 2 24 86 TANAN Hewlett Packard Taiwan 39 Chung Sinao West Road Sec 1 Overseas Insurance Corp Bidg 7th Floor Taipei 161 579 605 579 610 579 613 IP824 HEWPACK Cable Taipei THAILAND The International Engineering Co Ltd P 0 39 614 Sukhumvit Road Tel 910722 17 unes Cable GYSOM INTENCU BK 226 Bangkok UGANDA Uganda Tete Electric Co Ltd Box 4449 Kampala Tel 57279 Cable COMCO Kampala VIETNAM Peninsular Trading Inc Box 210 Vuong Salgon Jei 20805 93398 Cable SAIGON 242 ZAMBIA R J Titbury Zambia Ltd Box 2792 Lusaka Za
121. or CAL OUTPUT level for an indicated 20 dBm CRT display 4 Connect Signal Generator output to upper FILTER PORT on Preselector 5 Connect lower FILTER PORT to Analyzer INPUT 6 Note and record signal level dB 7 Insertion loss should not exceed 2 5 dB 8 Record insertion loss lt 2 5dB_ dB 9 Set Analyzer SCAN WIDTH PER DIVISION to 5 MHz 10 Tune Analyzer and Signal Generator to 2050 MHz 11 Note and record insertion loss gt 50 dB dB 4 16 Yig Filter Insertion Loss SPECIFICATION Tracking Filter Insertion Loss 1 8 12 GHz 7 dB Standard and Option 020 6 dB Option 010 and 030 12 18 GHz 10 dB Standard and Option 020 8 dB Option 010 and 030 DESCRIPTION Yig filter insertion loss is measured at fixed frequency points by applying a known signal level tuning the Yig filter passband to the signal and measuring the power out the filter output port Perform the operational adjustment procedure in Figure 3 5 prior to performing the test below The operational adjustment procedure sets the FREQ OFFSET and TRACKING controls in addition to checking the insertion loss at 2 0 and 8 0 GHz The Yig filter is tuned by applying a voltage to the REMOTE input Voltage to frequency tuning ratio is 1 GHz volt The Preselector FREQ OFFSET control is used as a fine tuning control 4 6 Model 8445A Performance Tests PERFORMANCE TESTS s RR EE 4 16 Yig Filter Insertion Loss cont d SWEEP DC POWER SUPPLY OSCILLATO
122. ote Operation 1 8 to 18 GHz 3 10 Model 8445A Operation 3 14 When the analyzer local oscillator is tuned to 3 GHz 2050 MHz Ist IF image responses may occur at different frequencies Refer to Figure 3 7 Follow the 3 GHz local oscillator line up the figure noting the intersections with solid lines representing mixing modes Each of these signals appear at the same place on the display and are products of the different mixing modes The Pre selector eliminates images by allowing only se lected frequency bands to enter the analyzer s RF INPUT and allowing only one mixing mode to be used at one time 3 15 Spurious signal responses are caused when strong signals enter the RF INPUT of the analyzer and are of sufficient amplitude to cause inter modulation products The narrow bandwidth of the Preselector tuning response 85 MHz nominal acts to eliminate spurious signal responses on the display Signals that are farther apart than the Preselector bandwidth cannot appear in the analy zer input at the same time 3 16 PRESELECTOR BANDWIDTH 3 17 The Yig filter has a 3 dB bandwidth that is typically 30 to 45 MHz At the low frequency end of the filter range overcoupling causes a passband with double peak see Figure 3 8 The slight dip between the two peaks indicates the center of the filter bandpass and the point of adjustment for the FREQ OFFSET control At frequencies above 4 GHz the passband has a single peak see Figure
123. otective Coating Component replacement Circuit board repair Wiring Contamination corrosion protection Krylon Inc Norristown Pennsylvania 8 4 Wattage rating 47 5612 Tip Temp 850 900 degrees Shape pointed Ungar No PL111 De soldering aid To remove molten solder from Suction device Soldapult by Edsyn Co Arleta connection California Must not dissolve etched circuit base board material or conduc tor bonding agent Resin flux core high tin con tent 60 40 tin lead 18 gauge SWG preferred Good electrical insulation cor rosion prevention properties For working on etched Boards for general purpose work use Ungar No 1237 Heating Unit 37 5W tip temperature of 750 800 degrees and Ungar No PL113 1 8 inch chisel tip Ungar No 776 handle with Ungar No 4037 Heating Unit Freon Aceton Lacquer Thinner Isopropyl Alcohol 100 dry Krylon No 1302 Humiseal Protective Coating Type 1B12 by Columbia Technical Corporation Woodside 77 New York Model 8445A mA and 0 4 0 5 volt when collector current is 10 100 mA In contrast forward bias voltage for silicon transistors is about twice that for german ium types about 0 5 0 6 volt when collector current is low and about 0 8 0 9 volt when collector current is high 8 26 Figure 8 1 Part A shows simplified versions of the three basic transistor circuits and
124. ows Drive Indianapolis 46205 Tel 317 546 4891 TWX 810 341 3263 Hewlett Packard Do Brasil ind stria Comercia Ltda Praca Dom Feliciano 78 Salas 806 8 Porto Alegre RGS CHILE H ctor Calcagni y Cia Ltda Bustos 1932 3er Piso Casilla 13942 Santiago Tel 423 96 Cable CALCAGNI Santiago COLOMBIA instrumentacion Henrik A Langebaek amp Kier Ltda Carrera 7 No 48 59 Apartado Aereo 5287 Bogata 1 D E Tel 45 78 06 45 55 46 Cable AARIS Bogota Telex 44400 INSTCO COSTA RICA Alfredo Gallegos Gurdi n Apartado 10159 San Jos Tel 21 86 13 Cable GALGUR San 1056 BRITISH COLUMBIA Hewlett Packard Ltd 4519 Canada Way North Burnaby 2 Tel 604 433 8213 TWX 610 922 5059 UNITED STATES LOUISIANA Box 856 1942 Wiliams Soulevard Kennet 72062 Tet 504 721 5201 TWX 810 955 5524 MARYLAND 6707 Whitestone Road Baltimore 21207 Tel 301 944 5400 TWX 710 862 9157 P O Box 1648 2 Choke Cherry Road Rockville 20850 Tet 301 948 6370 TWX 710 828 9684 MASSACHUSETTS 32 Hartwell Ave Lexington 02173 Tel i617 861 8960 TWX 710 326 6904 MICHIGAN 21840 West Nine Mile Road Southfield 48075 Tet 313 353 9100 TWX 810 224 4882 MINNESOTA 2459 University Avenue St Paul 55114 Tel 612 645 9461 TWX 910 563 3734 MISSOURI 11131 Colorade Ave Kansas City 64137 Tel 816 763 8000 TWX 810 771 2087 2812 South Brentwood Bivd St
125. per between pins 3 and 13 of XA5 TROUBLESHOOTING PROCEDURE When a malfunction has been isolated to the Coaxial Switch Driver Manual Control Buffer Amplifier Remote Control Buffer Amplifier or Automatic Switching Control circuit perform the following test procedure Connect Preselector to Analyzer apply power and allow instruments to warm up and stabilize Warmup time required only for measurements associated with amplifiers A2U2 and A2U3 Make all voltage measurements in reference to 2 common ground point EQUIPMENT REQUIRED 8555 Spectrum Analyzer HP 8555A 8552 140 Digital Voltmeter HP 3480A Power Supply s ai e 1 HP 6205B RB COAXIAL SWITCH DRIVER Set Analyzer controls as follows BAND to n 1 550 MHz IF FREQUENCY to 1 5 GHz and SCAN WIDTH to ZERO On Preselectors with manual controls set MODE switch to AUTO Connect voltmeter to test point A Press Frequency BAND Lever on 8555A RF Section to select BANDS 1 550 MHz IF through n 4 Note voltage level indicated for each band The voltage level should be approximately 19 5 volts on all bands except n 1 2 05 GHz IF band which should indicate approximately 0 volt Check voltage levels at test points ID and E for both n 1 2 05 GHz IF and n 1 550 MHz IF bands Use transistor cases A2Q2 Q3 and Q4 for test points and D Compare level with ty pical le
126. perating range Instruments without manual controls can be remotely tuned over this range Disconnect the interconnect cable between the Preselector and the Spectrum Analyzer Connect a variable dc source to the REMOTE input A voltage at the REMOTE input tunes the Yig filter at a ratio of 1 GHz volt TEST EQUIPMENT REQUIRED Spectrum 8555A 8552 140 Digital Voltmeter HP 3450A Oscilloscope 180A 1801A 1821A Frequency Comb HP 8406A Set analyzer controls as follows n 1 2 05 GHz IF SCAN WIDTH PER DIVISION SCAN WIDTH BANDWIDTH 200 MHz Preselector with manual controls set MODE switch to AUTO With Interconnect Cable W3 disconnected from Preselector apply power to Preselector Preselector line voltage fuse AGF1 fails Connect Interconnect Cable W3 Replace fuse 1 and apply power to Preselector Remove top cover from Preselector Check fuse A2F1 19 5 V supply check fuse A2F2 23 V supply check fuse A3F1 and 40 V supply Con nect Interconnect Cable W3 Troubleshoot Power Supply Assembly A2 SS6 Troubleshoot Coaxial Switch Driver circuits SS5 Preseiector line voltage fuse AGF1 fails Preselector line voltage fuse AGF1 fails or failure NO Preselector voltage supply YES Analyzer LO feedthrough signal disappears from CRT dis
127. play YES Check Sweep Tune input from analyzer to Preselector at ATTP1 for a 5 to 10 volt sweep ramp Set Analyzer SCAN WIDTH to PER DIVISION NO Check input wiring and Interconnect Cable W3 YES Analyzer stops sweeping Trace forms a dot on display screen CAUTION Do not operate Analyzer with a high intensity dot stopped on screen CRT damage will occur YES Check Sweep input to Preselector for shorted cable or wiring Voltage level at XA1 Pin 12 should bea 5 to 5 volt ramp Connect Cable W1 between Preselector FILTER PORT and Analyzer INPUT Set Analyzer SCAN WIDTH to FULL Connect a Comb Generator to the other Preselector FILTER PORT Set Comb Generator for 100 MHz comb signals at maximum output level Check Analyzer display for signals Set Analyzer SCAN WIDTH to ZERO Connect a digital voltmeter to test point 1 Adjust Analyzer FREQUENCY control for a digital volt meter indication of 5 000 volts Use test point A3TP2 as common ground point Signal source or sources capable of producing a 30 dBm signal over the frequency range of 10 MHz to 2 0 GHz NO YES Normal indication for Preselector without Low Pass Filter Low Pass Filter installed check coaxial switch driver circuit and switches SS5 Analyzer displays comb signals from approxi mately 800 MHz to 2 GHz Analyzer tries to tune Yig Filter below its frequency limit
128. portional to the 1st LO frequency in the 8555A RF Section and varies linearly from 5 000 005 Vde at 2 05 GHz to 10 000 005 Vdc at 4 1 GHz Precision resistors in the amplifier circuit are switched to provide gain according to the harmonic mixing mode in the RF Section n or AMPLIFIER The n or amplifier A1U2 provides an offset voltage to match the or mixing mode in the RF Section A 9 0 Vdc reference voltage from Yig Driver Assy A3 applied to the amplifier provides a 9 0 Vdc level for minus mixing modes and a 9 0 Vdc level for the plus mixing modes The positive or negative voltage is controlled by band code bit E from the RF Section IF 550 MHz or 2 05 GHz NETWORK The 550 or 2 05 network provides a voltage offset equivalent to the first IF frequency in the Analyzer RF Section The resistive network is driven by the 9 or 9 Vdc from the n or amplifier and provides an output of either 0 537 or 2 000 volts at the output of summing amplifier A1U3 The voltage level is controlled by band code bit D from the RF Section A1R26 ADJ 4 adjusts the 2050 MHz IF offset and A1R28 ADJ 5 adjusts the 550 MHz offset EJ SUMMING AMPLIFIER Summing amplifier A1U3 combines the output from the harmonic number amplifier with the output from the IF 550 MHz or 2 05 GHz network to produce a voltage proportional to the frequency to which the Analyzer is tuned The output from the summing amplifier is
129. quency Indicator to position trace on upper third of CRT display 4 Adjust Frequency Meter for 2 0 GHz Note dip in display indicating 2 GHz frequency point 9 Adjust FREQ OFFSET control to center Preselector passband at 2 0 GHz 6 Replace Sweep Oscillator 8692B RF Unit with 8694B RF Unit 7 Tune Sweep Oscillator to 8 0 GHz with START CW control 8 Replace Frequency Meter HP 536A with HP 537A Tune Frequency Meter to 8 0 GHz 9 Adjust Power Supply output voltage for 8 000 002 Vdc 10 Adjust Preselector TRACKING control to center passband at 8 0 GHz 11 Repeat passband adjustments for 2 0 and 8 0 GHz 12 Replace Sweep Oscillator 8694B RF Unit with 8695A RF Unit Adjustments Model 8445A ADJUSTMENTS 5 12 Yig Driver Adjustments Linear Operation cont d 13 Tune Sweep Oscillator to 12 5 GHz with START CW control 14 Replace Frequency Meter HP 537A with HP P5324 Tune Frequency Meter to 12 5 GHz 15 Adjust Power Supply output voltage for 12 500 002 Vdc 16 Adjust A3R29 to center Preselector passband at 12 5 GHz 17 Tune Sweep Oscillator and Frequency Meter to 15 5 GHz 18 Adjust Power Supply output voltage to 15 50 Vdc 19 Adjust A3R24 to center Preselector passband at 15 5 GHz 20 Tune Sweep Oscillator and Frequency Meter to 18 0 GHz 21 Adjust Power Supply output voltage to 18 00 Vdc 22 Adjust A3R21 to center Preselector passband at 18 0 GHz 23 Repeat steps 13 through 22 Model 8445A Adjustments
130. r to performance test the Pre selector PERFORMANCE TESTS 4 14 Out of Band Rejection SPECIFICATION For Yig filter 1 GHz from center of passband gt 50 dB typically 55 dB DESCRIPTION The Yig filter is tuned to a fixed frequency either manually or remotely A signal is applied through the filter and the power output level measured The signal source is then shifted 1 GHz and the power output level is again measured The difference between the two power levels is the out of band rejection for 1 GHz frequency separation 4 2 Model 8445A Performance Tests PERFORMANCE TESTS DC POWER SUPPLY SIGNAL GENERATOR a 1 REMOTE Lo a SPECTRUM ANALYZER Figure 4 1 Out of Band Rejection Test Setup EQUIPMENT Spectrum 2 8555 8552 141 Signal Generator s e x ded ET ex Es ee eer HP 8616B Power Supply E u aya Wd RE X ue DAS EIS HP 6205B Coaxial Cable BNC to alligator clips HP 10501A Required for Preselectors without manual controls 1 Connect test setup as indicated in Figure 4 1 and make the following control settings PRESELECTOR without manual controls a ieee HO ee ON Interconnect Cabl 45 2 E voe ee ewe Disconnected PRESELECTOR with manual controls LINE OR B ON Ng eee oin Ee ee IBS ON
131. r to performing the adjustment procedure below DESCRIPTION The Yig Driver is adjusted to tune the Yig Filter to track the tuning response of the Spectrum Analyzer Operational amplifier A3U1 is adjusted for null Front panel adjustments are performed to provide correct frequency offset and tracking The Yig linearity correction breakpoints are adjusted to compensate for saturation in the Yig core at the higher frequencies 9 6 Mode 8445A Adjustments ADJUSTMENTS 5 11 Yig Driver Adjustments Matched Operation cont d DIGITAL MULTIFUNCTION FREQUENCY COMB VOLTMETER UNIT GENERATOR SWEEP RF OSCILLATOR UNIT NOTE See Figure 8 5 for adjustment and test point locations Figure 5 4 Yig Driver Check and Adjustment Test Setup Matched Operation EQUIPMENT Spectrum Analyzer HP 8555A 8552 141T Sweep Oscillator 2 2 2 lll s s ee ee HP 8690B RF Unit 2 2 HP 8695A Comb Generator 8406 Digital Voltmeter with 3484A Multifunction Unit HP 3480B Four foot test leads with alligator clips 2 each 1 With test setup as indicated in Figure 5 4 apply power to Preselector and Spectrum Analyzer Allow at least 30 minutes for equipment to stabilize Note Perform the Power Supply and Pre Driver Check and Adjustment Procedures prior to performing the Yig Driver adjustments 2 Center F
132. rack mounted A different mounting installation will require a different RF cable to connect between the Preselector output and the Spectrum Analyzer input The power cable supplied with the instru ment is selected at time of shipment Selection is based on shipping destination Figure 2 1 illustrates the different power cable connectors that are currently available 1 23 OPERATING ACCESSORIES 1 24 Operating accessories for use with the Pre selector are listed in Table 1 4 Operating acces sories include various lengths of rigid coaxial cable for interconnecting the Preselector with the Spec trum Analyzer See Table 1 4 for cable length and connector type Cable dimensions are illustrated in Figure 1 4 Table 1 2 Accessories Supplied 8120 1348 Line Power Cable 08445 20022 RF Interconnect Cable 08445 60007 Interconnect Cable 5060 0774 Rack Mounting Kit 5060 0216 Joining Bracket Kit See paragraph 2 15 and Figure 2 1 See paragraph 1 24 and Figure 1 4 719 feet 3 wire Ac Line Rigid Coaxial Cable Connects Preselector RF output to Spectrum Analyzer RF Input Type N connectors 18 inch Control Cable interconnects Preselec tor with Spectrum Analyzer Hardware and parts for mounting Preselector in 19 inch rack Hardware and parts for strapping Preselector to Spectrum Analyzer NUT SaPPLIED WITH OSO 1 3 General Information Model 8445A Table 1 3 Test Equipment a
133. rminal of power supply REMOTE center pin and shield now shorted together Page 6 6 Table 6 2 Change P1 to 1251 0158 CONNECTOR PC EDGE 6 PIN 76530 250 06 30 210 Page 8 13 Figure 8 7 and Page 8 17 Figure 8 15 Change YIG Filter Assy A4 terminal 6 to read terminal 5 and change terminal 5 to read terminal 6 CHANGE 1 Page 6 6 Table 6 2 Add MP4 5000 8595 COVER SIDE PERFORATED OLIVE GRAY 5000 8595 Change MP4 to 5000 0731 COVER SIDE PERFORATED BLUE GRAY 5000 0731 Add 5 5020 6850 FRONT PANEL TRIM BOTTOM MINT GRAY 5020 6850 Change MP5 to 5020 0900 FRONT PANEL TRIM BOTTOM LIGHT GRAY 5020 0900 Add MP6 5020 6851 FRONT PANEL TRIM TOP MINT GRAY 5020 6851 Change MP6 to 5020 0901 FRONT PANEL TRIM TOP LIGHT GRAY 5020 0901 more NOTE Manual change supplements are revised as often as necessary to keep manuals as current and accurate as possible Hewlett Packard recommends that you periodically request the latest edition of this supplement Free copies are available from alt HP offices When requesting copies quote the manual identification information from your supplement or the mode number and print date from the title page of the manual 7 September 1972 HEWLETT jp PACKARD Printed in U S A 8445A CHANGE 1 cont d Page 8 1 insert new Table 8 1 Page 8 17 Figure 8 15 Change R5 to R5 Change R8 value to 2 675 Designation PANEL TRIM STRIP MINT GRAY Add MP10 08443 40005 28
134. rt cir cuits and open circuits In transistor circuit testing the most important consideration is the transistor base to emitter junction The base emitter junction in a transistor is comparable to the control grid cathode relationship in a vacuum tube The base emitter junction is essentially a solid state diode for the transistor to conduct this diode must be forward biased As with simple diodes the forward bias polarity is determined by the mater ials forming the junction Transistor symbols on schematic diagrams reveal the bias polarity re quired to forward bias the base emitter junction The B part of Figure 8 1 shows transistor symbols with the terminals labeled The other two columns compare the biasing required to cause conduction and cut off in NPN and PNP transistors If the transistor base emitter junction is forward biased the transistor conducts However if the base emitter junction is reverse biased the transistor is cut off open The voltage drop across a forward biased emitter base junction varies with transistor collector current For example a germanium tran sistor has a typical forward bias base emitter volt age of 0 2 0 3 volt when collector current is 1 10 Table 8 4 Etched Circuit Soldering Equipment Soldering tool Soldering Unsoldering Soldering Tip Soldering Unsoldering Remove excess flux from soldered area before applica tion of protective coating Resin flux Pr
135. s Analyzer displays comb signals from 100 MHz to 1 8 GHz Normal indication for Preselector with Low Pass Filter Set switch A3S1 to TEST position Connect digital voltmeter to A1TP3 Select BANDs n 1 n 2 n 3 and n 4 Note voltage indication for each BAND Voltage level 10 mV at test point ATTP3 550 MHz IF 2 000 Vdc 2050 MHz IF 2 000 Vdc 4 000 Vdc 6 000 Vdc 8 000 Vdc Check band code input bits A and B Check Harmonic Number and Summing Amplifiers SS3 ATTP3 Set switch A3S1 to OPR position Select BANDs n 1 through n 4 while noting voltage level at Service Voltage level 10 mV at test point ATTP3 n 1 1 lt 1 550 MHz IF 1 463 Vdc 550 MHz IF 2 536 Vdc 2050 MHz IF N A n 1 2050 MHz IF 4 000 Vdc 2 2 n 3 n 3 4 n 4 work 553 Check band code inputs bits D and E Check Offset Amplifier and 550 2050 MHz IF Net Tune Analyzer to 18 GHz n 4 BAND With digital voltmeter measure voltage across each Yig Filter coil Use Yig Filter terminal 2 as reference point measure voltage at terminals 1 and 5 Dif ference in voltage drop across the two coils should not exceed 50 mV at 18 GHz or 5 mV at 1 8 GHz 2 000 Vdc YES 6 000 4 000 Vdc 8 000 Vdc 6 000 Vdc 10 000 Vdc 1 Select BAND n 1 550 MHz IF Disconnect cables fro
136. s cont d Connect digital voltmeter to test point AITP4 Adjust A1R23 for null indication Test limits 0 00 0 2 mV Record level Connect digital voltmeter to test point A1TP3 Adjust A1R31 for null indication Test limits 0 00 0 2 mV Record level Set switch A3S1 to OPR position Adjust A1R26 for 2 000 volts at test point 1 Test limits 2 000 002 V Record level Set Spectrum Analyzer BAND to 2 Verify that voltage level at test point A1TP3 is 2 000 volts Test limits 2 000 002V Record level Set Spectrum Analyzer BAND to n 1 550 MHz IF Adjust A1R28 for 536 6 mV at test point 1 Test limits 536 6 2 0 mV Record level Set Spectrum Analyzer BAND to n 1 550 MHz IF Verify that voltage level at test point A1TP3 is 536 6 mV Test limits 536 6 2 0 mV Record level Set Spectrum Analyzer BAND to n 1 2 05 GHz IF Set switch A1S1 to OPR position Set switch 351 to TEST position Adjust Spectrum Analyzer FREQUENCY control for an indicated voltage level of 3 000 volts at test point A1TP3 Check and record the voltage level for each of the FREQUENCY BANDS below FREQUENCY BAND Test Limits Vdc Record Level 1 3 000 002 PEE n 2 6 000 003 n 2 6 000 003 n 3 9 000 004 n 3 9 000 004 n 4 12 000 005 n 4 12 000 005 Model 8445A Adjustments ADJUSTMENTS 5 9 Pre Driver Checks and Adjustments
137. sing TYPE CUTOFF CONDUCTION NPN CURRENT COLLECTOR BASE EMITTER PNP COLLECTOR V CONTROL MAIN BASE amp CURRENT CURRENT EMITTER Figure 8 1 Transistor Operation 8 5 Service Model 8445A FIELD EFFECT TRANSISTORS BLACK EPOXY METAL CASE METAL CASE PLASTIC 1 e DGS R SGD 605 OR GOS DIODES DIODE SYMBOL ANODE CATHODE 7 i V bab Fl M h 7 CATHODE CATHODE CONICAL CATHODE END m mS A 8 B hu Mud um 4 BI POLAR TRANSISTORS BLACK EPOXY PLASTIC TRANSISTORS EBC METAL CASE TRANSISTORS DUAL Figure 8 2 Examples of Diode and Transistor Marking Methods external circuitry and components If the external circuitry input signal operating voltages feedback resistors is normal replace the operational ampli fier 8 31 ELECTRICAL MAINTENANCE 8 21 Perform the electrical checks and adjust ments once every six months and after repair or component replacement 8 6 8 33 MECHANICAL MAINTENANCE 8 34 Inspect the air filter at the rear of the instrument frequently and clean it before air flow is restricted To clean the filter wash thoroughly in warm water and detergent Air dry filter before installing it on the instrument 8445 Service A B INPUT INPUT OUTPUT OUTPUT R2 CAIN 1 GAIN 1 RI R2 INPUT IMPEDANCE VERY H
138. ss Insertion Loss Frequency ea od id x S Limiting Level Maximum input level for lt 1 dB signal compression gt 5 dBm Low pass DC 1 8GHz lt 2 5 dB Filter 2 05 GHz gt 50 dB Burnout Level gt 17 dBm Tracking 1 8 12GHz lt 7 dB lt 6 dB Remote Function YIG filter frequency can be set by Filter 12 18 GHz lt 10 dB lt 8 dB externally supplied voltage Differential input utili zed to eliminate AC hum or other common mode signals which may be present on remote drive input cable Low Pass Filter deleted with Options 010 and 030 Sensitivity Nominally 1 volt GHz with direction of tuning from low to high frequency Differential Input Resistance 2K ohms en D Common Mode Rejection Ratio 80 dB 6 YIG 210 Response Typically 20 dB down from LP FILTER d M viG FILTER main mode tuning response Figure 1 3 Typical Preselector Settling Time Typically within 3 MHz of final Minimum Insertion Loss 25 C 9 E CH frequency after 5 msec Input VSWR Typically lt 1 8 1 8 18 GHz Tuning Linearity Typically 10 MHz Out of Band Rejection For YIG filter 1 GHz from Remote Input Connector BNC female outer con center of passband gt 50 dB typically 55 dB ductor isolated 1 9 OPTIONS 1 12 The Model 8445A Option 010 Automatic Preselector is the same as the standard Preselector 1 10 Model 8445A Automatic Preselector except the 1 8 GHz
139. t Table of Contents Page 8 15 8 16 8 16 8 16 8 16 8 17 8 18 8 19 8 19 8 21 8 21 Page 5 13 6 1 6 2 6 7 8 1 8 2 8 3 8 4 iil General Information Model 8445A MODEL 8445A PRESELECTOR oo 5060 0774 08445 60007 mga 08445 20022 8120 1348 5060 0216 Figure 1 1 Model 8445 and Accessories Model 8445 General Information SECTION GENERAL INFORMATION 1 1 INTRODUCTION 1 2 This manual contains all information required to install operate test adjust and service the Hewlett Packard Model 8445A Automatic Preselec tor This section covers instrument identification description options accessories specifications and other basic information 1 3 Figure 1 1 shows the Hewlett Packard Model 8445A Automatic Preselector with accessories sup plied 1 4 The various sections in this manual provide information as follows SECTION II INSTALLATION provides in formation relative to incoming inspection power requirements mounting packing and shipping etc SECTION III OPERATION provides inform ation relative to operating the instrument SECTION IV PERFORMANCE TESTS pro vides information required to ascertain that the instrument is performing in accordance with published specifications SECTION V ADJUSTMENTS provides infor mation required to properly adjust and align the instrument after repairs are made
140. upplies Check and Adjustment REFERENCE Service Sheet 6 DESCRIPTION Power supplies in the Preselector provide regulated outputs of 19 5 and 23 volts and an unregulated output of 40 volts Only the 19 5 volt supply is adjustable These checks verify proper operation of the power supplies DIGITAL MULTIFUNCTION VOLTMETER UNIT 2 amp A2TP VARIABLE VOLTAGE TRANSFORMER MULTIFUNCTION VOLTMETER TO TERMINALS 183 NOTE See Figure 8 5 for adjustment and test point locations Figure 5 1 Power Supply Check and Adjustment Test Setup EQUIPMENT Digital Voltmeter w 3484A Multifunction Unit AC Voltmeter HP 3480B Sak hs Gen eta ade ba Mo i be HP 410 Deni e MES u General Radio W5MT3A Note Unless otherwise specified all dc voltages are measured with respect to test point A3TP2 5 1 Adjustments Model 8445A ADJUSTMENTS 5 8 Power Supplies Check and Adjustment cont d PROCEDURE 1 Connect test setup as indicated in Figure 5 1 2 Remove top cover from Preselector and connect digital voltmeter test leads to A2TP1 19 5 Vdc and 2 signal reference ground Connect AC voltmeter to terminals 1 and of power transformer 1 3 Apply power to Preselector measure and record the 19 5 volt output Vary the ac line voltage from 103 5 to 126 5 volts The 19 5 volt regulated output should not vary more than 20 mV AC Input 19 5
141. urements adjust FREQ OFFSET for maxi mum signal level at frequency of measurement 3 25 PRESELECTOR TRACKING REMOTE MANUAL OPERATION 3 26 Preselector tracking in both REMOTE and MANUAL operating modes is affected by the front panel FREQ OFFSET and TRACKING controls Adjustment of these controls changes the accuracy of the 1 volt GHz remote tuning and the dial accuracy of the manual controls To adjust FREQ OFFSET and TRACKING controls for REMOTE or MANUAL operation perform adjustment pro cedures in paragraph 5 12 Yig Driver Adjustments Linear Operation 3 13 3 14 Model 8445A Performance Tests SECTION IV PERFORMANCE TESTS 4 1 INTRODUCTION 4 2 This section contains front panel checks and performance tests for the 8445A Automatic Pre selector Front panel checks for routine inspection are given in paragraph 4 5 Procedures for verify ing that the instrument meets specifications are given in paragraphs 4 14 through 4 17 The front panel checks preset adjustments and performance test should be performed using the 8555A Spec trum Analyzer System that will normally be used with the Preselector 4 3 EQUIPMENT REQUIRED 4 4 Test equipment and test accessories for per formance P adjustment A and troubleshooting are listed in Table 1 3 Critical specifications and or required features for the test equipment and accessories are contained in the test equipment and test accessories table 4 5 FRONT P
142. vels given below Voltage Level BAND BAND n 1 2 05 GHz IF n 1 550 MHz IF 2 A2TP 2 A2TP SERVICE SHEET 5 cont d MANUAL CONTROL BUFFER AMPLIFIER Check operational amplifier A2U2 for unity gain and inversion of input voltage Compare input voltage at A2U2 Pin 2 with output at A2TP6 See paragraph 8 30 for Operational Amplifier troubleshooting procedure REMOTE CONTROL BUFFER AMPLIFIER Connect a 10 volt power supply to REMOTE input positive to center conductor and negative to shield Check operational amplifier A2U3 for unity gain and inversion of input voltage at A2TP4 See paragraph 8 30 for Operational Amplifier troubleshooting procedure See paragraph 5 10 for Remote Contro Buffer Amplifier Adjustment AUTOMATIC SWITCHING CONTROL CIRCUITRY Check relay driver A3Q1 and relay A3K1 A3Q1 should be saturated and relay A3K1 energized except when Preselector is in Remote Operating Mode The Preselector automatically switches to Remote Operating Mode when the Analyzer s power is removed or when interconnect cable W3 is disconnected 1250 0909 MP1 OPTION 001 1250 0816 p MP2 N MP7 MP 2190 0104 MP8 08761 2027 MP5 08555 20094 08555 20093 MP3 5040 0306 MP2 1250 0915 MP1 1250 0914 Figure 8 16 Filter Port Connector Exploded View Switching Manual and Remote Control SERVICE SHEET 5 2950 0132 Service
143. y 5 8 Model 8445A Adjustments ADJUSTMENTS aa 5 11 Driver Adjustments Matched Operation cont d 27 Tune Spectrum Analyzer and Sweep Oscillator to 15 5 GHz 28 Adjust A3R4 to maximize signal on CRT display 29 Tune Spectrum Analyzer and Sweep Oscillator to 18 GHz 30 Adjust A3R21 to maximize signal on CRT display 31 Repeat steps 25 through 30 5 12 Yig Driver Adjustments Linear Operation REFERENCE Service Sheet 4 Note This procedure aligns the Preselector for linear operation Use this procedure when the Preselector is to be used with different Spectrum Analyzers See paragraph 5 11 Yig Driver Adjustment for Matched Operation See paragraph 3 23 for improvement in Spectrum Analyzer adjustments prior to performing the adjustment procedure below DESCRIPTION The Yig Driver is adjusted for linear frequency tracking with voltage Operational amplifier A3U1 is adjusted for null Front panel controls are adjusted to provide correct frequency offset and tracking The Yig linearity correction breakpoints are adjusted to tune the filter bandpass to fixed frequency points for fixed input voltages The linearity breakpoints compensate for saturation in the Yig core at the higher frequencies 5 9 Adjustments Model 8445A ADJUSTMENTS 5 12 Yig Driver Adjustments Linear Operation cont d FREQUENCY METER REMOTE INPUT SWEEP OSCILLATOR RF UNIT DC POWER SUPPLY CRYSTAL DIRECT

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