HP-608D-Manual 电路图.pdf

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1、 HP Archive This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! On-line curator: Glenn Robb This document is for FREE distribution only! RadioFans.CN 收音机爱 好者资料库 OPERATIONANDMAINTENANCEHANDBOOK FOR MODEL608D VHFSIGNALGENERATOR Page2, Page4, Page4,

2、Page4, Page8, #608D006 ERRATA Paragraph1-3,line14: change10.5milliwattto0.1milliwatt. Specifications,OutputLevelCalibrationAccuracy: change12decibelstoldecibel. Specifications,ExternalSineWaveModulation: change4to25-voltrmssignalrequiredto 0.5-voltrmsorbetterr-uired. Specifications,ExternalPulseModu

3、lation: changePositivela-voltpeakpulserequiredto Positive5-voltpeakpulserequired. Figure2,item20: arrowshouldpointtorecessedscrewaboveZERO RadioFans.CN 收音机爱 好者资料库 i OPERATIONANDMAINTENANCEHANDBOOK FOR MODEL608D VHFSIGNALGENERATOR Copyright1955byHewlett-PackardCompany Theinformationcontainedinthisboo

4、klet isintendedfortheoperationandmain- tenanceofHewlett-Packardequipmentand isnottobeusedotherwiseorreproduced withoutthewrittenconsentoftheHelett- PackardCompanyo HEWLETT-PACKARDCOMPANY 275PAGEMILLROADsPALOALTOsCALIFORNIA,U.S.Ao RadioFans.CN 收音机爱 好者资料库 SectionI SectionII TABLEOFCONTENTS MODEL608D V

5、HFSIGNALGENERATOR GENERALDESCRIPTION 1-1Introductory. 1-2AuxiliaryEquipment. 1-3GeneralElectricalCharacteristics. INSTALLATIONANDOPERATION PageNo. 1 1 2 -.D 2-1Introductory.0 . ,5 0 2-2Installation5 (:l . , co 2-3OperatingControls,Dials,and 0 -.DTerminals , 5 * 2-4TurningontheEquipment6 Q) 2-5Contin

6、uousWaveOperation 11 2-6InternalSineWaveModulation12 0 .02-7ExternalSineWaveModulation13 cO 2-8PulseModulation14 d r.=2-9Crystal-ControlledBeatFrequency IIIt Calibrator15 , N 2-10SignalGeneratorLoading cr- . Considerations15 , . 2-11Adjust.Control16acOFineFreq. . 1-t Q) U) SectionIIITHEORYOFOPERATIO

7、N Ill Ill -. 3-1General17 cr- . , . 3=2RadioFrequencyOscillator19 -. Ill3-3RadioFrequencyBuffer . 20 3-4RadioFrequencyPowerAmplifier 21 (:l 3-5OutputAttenuatorandR-FPower co Monitor220. , , -.D 3-6Xtal(BeatFrequency)Calibrator23 3-7ModulatorSection 24 3-8Modulation-MeasuringCircuits .26 3-9PowerSupp

8、ly , ,26 3-10HeaterSupplyMultivibrator 27 SectionIV TABLEOFCONTENTS(Contd.) MAINTENANCE PageNo. 4-1 4-2 4-3 4-4 4-5 4-6 4-7 4-8 4-9 4-10 4-11 4-12 4-13 4-14 4-15 4-16 4-17 Introduction. CabinetRetnoval. PeriodicChecksandRoutineCare. LocalizingTrouble. PowerSupplyTroubleShootingand Adjusttnent. Syste

9、tnAnalysisCheckChart. ReplacetnentofElectronTubes. RadioFrequencyOscillatorTube Replacetnent. RadioFrequencyAtnplifierand BufferTubeReplacetnent XtalFrequencyOscillatorTube orCrystalReplacetnent. ReplacetnentofElectronTubes WithintheRegulatedPower Supplies. AttenuatorProbeReplacetnent Replacetnentof

10、LatnpII CalibrationofthePercent ModulationMeter. OutputVoltsMeterCalibrationand R-FPowerMonitorService RepairingtheCalibrator Oscillator. TroubleShootingChart 29 31 31 33 34 36 41 43 45 47 49 51 54 0- 0 00 54 tl Jl 57 -. . -.!) 61 -.:. Jl 62 Jl U1 1 . Pl . . -.!) N Pl ., P. g. 0 : =l;: 0- 0 00 .tl 0

11、 0 0 Title t Figure 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 LISTOFILLUSTRATIONS PageNo. VHFSignalGenerator=hp-Model608D,.Y:;ooItispiece Model608DSignalGeneratorFrontPanel Controls.,001:)0:J1I18 DiagramShovlingRelationshipsofFront PanelControlstoMajorCircuits10 BlockDiagramforSignalGenerat

12、or608D18 CabinetRemovalDiagram000030 R-FTunerDriveMechanism0,032 TubeLocationDiagram0,42 R-FOscillatorandAmplifierTube ReplacementDiagram.?.44 DiagramShowingAdjustmentfor InternalFreqoCalibrator.46 R-FGeneratorAssemblyRearViewr ShowingOutputAttenuatorDriveSystem48 R-FOutputAttenuatorPobeShowing Pick

13、upLoopandImpedanceMatching Network.000050 Model608DSignalGeneratorRightSide ViewgCabinetRemoved,.,.64 Model608DSignalGeneratorRearViewg CabinetRemoved.0,65 Model608DSignalGeneratorLeftSide ViewpCabinetRemoved.00.0066 R-FGeneratorAsemblygSidePlate RemovedtoShowTuningCompartments67 TubeCompartmentofR-

14、FGenerator Assembly,FrequencyDialandCover PlateRemoved00000068 SignalTracingBlockDiagram69 TubeSocketVoltageandResistance DiagramgRightSideChassis71 TubeSocketVoltageandResistance DiagramgRearChassis.0073 TubeSocketVoltageandResistance Diagram9R-FGeneratorAssembly75 J1 . . -D . J1 J1 =#: 0 o 00 t:l

15、o o 0 Fig.1.VHFSignalGenerator-hp-Model608D q 00 o 1-1 1-2 SECTIONI GENERALDESCRIPTION INTRODUCTORY TheHewlett-PackardModel608DVHFSignalGeneratorisa generalpurposetestinstrmnentwhichfurnishesaccuratelyadjust- ableradiofrequencysignalsfrom0,1microvoltto0.5voltover thefrequencyrangefrom10to420megacycl

16、esandwhichmaybe amplitudemodulatedbyinternallygeneratedsinewavesorbyex- ternallyappliedsinewavesorpulses.The608Dincludesabuilt- incrystal-controlledheterodynecalibratorwhichpermitsthe operatortoadjusttheoutputfrequencyveryaccuratelyatcheck pointsevery5megacyclesoverthefullfrequencyrangeofthein- stru

17、ment.Theoutputsignallevelisadjustedbyanattenuator calibratedinbothvoltsanddbmandcanbereaddirectlytoan accuracyof1dboverthefullfrequencyrangewithouttheuseof externalpads,monitoringdevices.orcharts.The608Dfeatures straightforwardoperationthroughtheuseofreliable.direct- readingcontrolsandmetersthrougho

18、ut.Withitshighqualityout- putsignal,the-hp=Model608Disespeciallysuitableforapplica- tionsrequiringaminimumofincidentalamplitudeorfrequency modulation. TheModel608DSignalGeneratorisdesignedtomeettheexacting requirementsofprecisionlaboratoryworkandyettobeequally usefulforgeneralapplicationsinthe10to42

19、0megacyclefrequency range.Theequipmentcanbeusedfortesting,calibrating.and troubleshootingVHFradioequipmentandcircuitsandformeasur- ingstandingwaveratios,antennaandtransmissionlinecharacter- istics,receiversensitivity,etc.Toobtainutmostaccuracyin thistypeofapplication.particularcarehasbeentaken-inthe

20、de- signofthe608Dtoholdspuriousmodulationtoaverylowvalue underalloperatingconditions. AUXILIARYEQUIPMENT TheModel608DSignalGeneratorisacompletetestequipment readyforuseasreceivedfromthefactory.Aspecialwrench necessaryforremovingther-famplifiertubeissuppliedandis mountedontheinstrumentchassis.Touseth

21、ecrystalcalibrator includedintheequipment,anearphoneheadsetmustbeprovided bytheoperator.Forexternalmodulationofthesignalgenerator. anexternalsourceofmodulatingvoltagemustbeprovidedbythe operator.Aspecialcoaxialfuseholderforprotectiontotheoutput -1- attenuatorisavailableasanaccessory.Thisfuseprotects

22、the outputattenuatorfrom.dam.ageintheeventthatanexternalvoltage isaccidentallyappliedtotheRFOUTPUTjack,Thefuseholder connectsdirectlytotheoutputjackandisprovidedwithastandard fem.aletypeNoutputjack.Atype8AGs1/16am.pfuseisutilized. Thefuseholderhasaninsertionlossof0.50dbat200m.c.0.56 dbat300m.Ctand0.

23、65dbat400m.c;anditsVSWRisnotgreater than1.35whenconnectedtoa50-ohm.resistiveload. 1-3GENERALELECTRICALCHARACTERISTICS TheModel608Dgeneratesr-foutputsignalsoverthefrequency rangefrom.10to420m.egacycleswhichareindicatedonadirect- readingdial.Thefrequencydialcalibrationisaccuratetobetter than1%whenthem

24、.ovableindexisinitsoriginalpositionasindi- catedbythealignm.entoftheadjustm.entknobwiththewhiteline onthepanel.Calibrationaccuracym.aybeim.provedbyem.ploy- ingthecrystal-controlledheterodynecalibrator.whichprovides checkpointsatevery5m.egacyclesovertheentirefrequency rangeoftheequipm.ent.Thefrequenc

25、ydialindexisadjustable from.thefrontpanelsothatatanycheckpointthecalibrationm.ay besetveryclosetothecalibratoraccuracyof0.01%.Thecheck- pointsignalsareobtainedbyconnectinganearphoneset(notpart oftheequipm.ent)totheXTALCAL.OU1PUTjack.Thecali-JJ bratoriscapableofprovidingupto-e-;-s:m.illiwattofpowerto

26、a./ 600-ohm.headsetandisadjustablebytheXTALCAL.GAIN control. Anoutputattenuator.calibratedtobereaddirectlyinbothvolts anddecibels.continuouslyvariestheoutputsignalfrom.+4to -127dbm.(350m.illivoltsto0.1m.icrovolt)andm.aybereadtoan accuracyofldborbetterovertheentirefrequencyandattenu- ationrangewhenco

27、nnectedtoanexternal50-ohm.resistiveload. Theinternalim.pedanceofthegenerator,asseenattheoutput jack.isnom.inally50ohm.soverthefullfrequencyrange;and whenconnectedtoa50-ohm.resistiveload,theVSWRduetom.is- m.atchwillnotbegreaterthan1.2(SWRof1.6db). Ther-foutputsignalfrom.the608Dm.aybeam.plitudem.odula

28、ted byinternallygenerated400-and1000-cyclesinewavesorby externallyappliedsinewavesabove.5voltrm.soverthefrequency rangefrom.20cpsto100kcorbyexternallyappliedpulsesabove approxim.ately10volts,Whenpulsem.odulated.the608Discapable ofgeneratingpulsesofradiofrequencyenergyasshortas4m.icro- secondsatr-fsi

29、gnalfrequenciesabove40m.egacyclesandpulses asshortas1m.icrosecondabove220m.egacycles.Thedegreeof sinewavem.odulationiscontinuouslyvariablefrom.0to95%bya frontpanelcontrol.Allsinewavem.odulationofther-foutput -2- en Cll ., . III . . .0 N III ;:l p. o o t:I III N 0, . o 00 o .0 2-3OPERATINGCONTROLS.DI

30、ALSANDTERMINALS Thefrontpaneloperatingcontrolsdialsandtertninalsforthe 608DarelistedwiththeirfunctionsinTable1andareshownin Figo20Asitnplifiedblockdiagratnshowingwhichcircuitsare affectedbyvariousfrontpanelcontrolsisshowninFigo30 i 2-4TURNINGONTHEEQUIPMENT CAUTION Donotobstructtheventilatinglouverso

31、nthe sidesoftheinstrumentcabinet.Safeopera- tingtemperaturedependsonfreeairflow throughtheselouvers. Toplacethesignalgeneratorintooperation,proceedasfollows: a.Locatethesignalgeneratorneara115-volta-cpower source, b.Withpowerswitchinoffposition,connectthepower cordtothesignalgeneratorandtothepowerso

32、urce. ._c. PlacetheMOD.SELECTORintheCWpositionandthe OUTPUTLEVELcontroltonearmaximum.Othercon- trolsmaybesetinanypositionbeforeturninggenerator on. f.Allowequipmenttoheatfor5minutesbeforeuse.If greatestfrequencystabilityisrequired,allowequipment toheatfor45minutes. d.TurnpowerswitchtotheONposition.T

33、hePOWERpilot lampshouldindicatethatpowerisappliedtoallcircuits ofthesignalgenerator. o 00 tJ ControlsandTerminalsTable1. e.AfterapproximatelyI-minutewarm-up,adjusttheAMP. TRIMMERformaximumreadingandOUTPUTLEVEL controltoobtainaSETLEVELreadingonthefrontpanel OUTPUTVOLTSmeter. Ref.No. Fig.l.Designation

34、Function 1PowerReceptacleReceivespower.fromcord supplied.Foruseon115- volt,50to400cycle,single- phase,a-csource. -6- Table1.(Continued) i o o Q 00 o =Il: Q) o tS. I1l N 0 14 14 (lj 0, J.4 Q) U) Q 00 o , Ref.No. Fig.1 Designation Function 2DC0.25AMP(fuse) Protectstheinternaldc powersupplyagainstshort

35、 circuitsintheinstrument. 3AC3AMP(fuse)Protectspowersourceand instrumentagainstshort circuits. 4PowerSwitch IntheONpositionallcir- cuitsofthesignalgenera- torareenergized. 5POWER(pilot Pilotlampthatindicates lamp)whenmaincircuitsare energized. 6MOD.SELECTOR Preparescircuitsforde- (switch)siredtypeof

36、modulation. 7 FREQUENCYSelectsfrequencyrangeto RANGE(switch)beusedandpositionsthe rangepointerontheMEGA- CYCLESdial. 8FREQUENCY Selectsoutputfrequencyin CONTROLcombinationwithFREQUENCY RANGEswitch. 9 MEGACYCLESIndicatesthefrequencyof (dial) therfoutputsignaldirectly inmegacycles. 10AMP.TRIMMER Tunes

37、r-fpoweramplifier (control)circuittotrackwithoscillator formaximumoutputasindi- catedonoutputmeter. 11OUTPUTLEVEL Adjuststher-fpowerlevel (control)existingatinputtooutput attenuator. -7- Fig.2.Model608DSignalGeneratorFrontPanelControls -8- CJ) to; . I - *a- o 00 tl o o a- -.0 o o o 00 o -.0 * - o 00

38、 o -.0 Ref.No. Fig.1. 12 13 14 15 16 17 18 19 20 21 22 Table1. Dcsignation OUTPUTVOLTS- DBM(tlleter) OutputAttenuator (control) RFOUTPUT (jack) XTALCAL,OUT- PUT(connector) XTALCALGAIN (control) EXT,MOD (jack) MOD.LEVEL (control) PERCENTMODU- LATION(tlleter) ZERO EXT.PULSE (jack) CALIBRATION ADJUSTME

39、NT -9- Function Indicatesr-fpowerlevel existingatinputtoout- putattenuator. Selectsandindicatesthe r-foutputlevelintllicro- volts,tllillivolts,and decibels. Outputconnectorfor1- outputsignal(See CAUTION). Outputconnectortocon- nectearphonestocrys- talcalibrator. Adjustsloudnessofbeat frequencysignal

40、obtained frotllXTALCAL.OUT- PUTjack. Receivessinewavefrotll externalsourcefortllod- ulationofr-foutputsig- nal. Adjuststllodulationper- centagetodesiredvalue asindicatedontllodula- tiontlleter. Indicatesthepercentage tllodulationofther-f outputsignal. Electricallysetsthetllodu- lationtlletertozerowi

41、th instrutllentinoperation withnotllodulationapplied. Receivespulsesfrotllex- ternalsourcefortllodula- tionofther-foutputsignal. Positionswindowhailline tofrequencydial. (SET)(ADJUSTANDREADI qIMILLIVOLTS-MICROVOLTSI (ADJUST) QIAMP.TRIMMERI (SELECT) Q (ADJUST! QIOUTPUTLEVELI QIMOOULATIONSELECTORI (AD

42、JUST) QIMOD.LEVELI 1 I I. I I , . o I IEXT.MOD.I IEXT.PULSEI MODULATOR RADIOFREQUENCY GENERATOR (ADJUST) IHAL.CAL.GAINIQ / / I / I READPERCENT MODULATION OUTPUT ATTENUATOR READSET LEVEL IRFOUTPUTI ZINT 50il. INTERNAlMODULATION OSCIllATOR CRYSTAL (BEATFREQUENCY) OSCIllATOR IHAL.CAL.OUTPUTI Fig.3.Diag

43、ramShowingRelationshipsofFrontPanelControls toMajorCireuits . 9000909#dAOq-epu-e261l-e1.IdSSS/61/S0909 -.0 o o Q co o -.0 :jj: Q co o -.0 CAUTION Donotconnectanysourceofr-ford-cpower totheRFOUTPUTjackontheModel608D SignalGenerator.Todosowillburnoutthe itnpedancetnatchingnetworkintheoutputat- tenuato

44、randnooutputwillbeobtained. Specialcaretnustbetakenwhenworkingwith ,.transceivertypeequiptnents,suchasVHF aircraftequiptnent,toinsurethatthetrans- tnitterretnainsinoperativewhilethesignal generatorisconnectedtotheequiptnent antenna. NOTE Forprotectiontotheoutputattenuatoronthe Model608DSignalGenerat

45、or,aspecialfuse- holderisavailableforconnectiontotheRF OUTPUTconnector.Whenusingthesignal generatorforanyapplicationwherethereis thepossibEityofvoltagebeingappliedtothe RFOUTPUTjack,thisfusetnaybeusedbe- tweentheoutputjackandthetestcablecon- nectingthesignalgeneratortotheexternal equiptnent. 2-.1;CO

46、NTINUOUSWAVEOPERATION General ForCWoperationthe608Dsuppliesacontinuouswaveoutputsig- nalwithlessthan1%hartnonicorspurioussignalsandwithless than0.1%incidentalatnplitudetnodulation.Over1tnilliwattof powercanbeobtainedacrossanexternal50-ohtnloadwiththe outputleveldirectlyindicatedtoanaccuracyofbettert

47、han1db foralltypesofoperation(seeparagraph2-10).WhensetforCW operation,theMOD.LEVELandXTALCAL,GAINcontrolsare inoperativeandtnaybesettoanyposition.ThePERCENTMODU- LATIONtneter,however,tnonitorstheoutputsignalduringall typesofoperationandtnaygivetnotnentaryfluctuationsresulting frOtnswitchingtransien

48、ts. -11- Step-by-StepProcedureforObtainingCWOperation a.Followingtheturningonproceduredescribedabove,set theMODSELECTORtoCWo b.SelectthedesiredbandoffrequencieswiththeFREQUENCY RANGEselector. c.SettheMEGACYCLESdialtothedesiredfrequency. d.SettheOUTPUTLEVELcontroltonearm.axim.Ulu. e.AdjusttheAMP,TRIM

49、MERform.axim.um.outputasindi- catedonOUTPUTVOLTSm.eter. f.ConnecttheexternalloadtotheRFOUTPUTjackonthe signalgenerator.(SeeprecedingCAUTION.) g.SettheOUTPUTLEVELcontroltoobtainareadingat SETLEVELontheOUTPUTVOLTSm.eter. h.Settheoutputattenuatorforthedesiredoutputlevelas readdirectlyfrom.theoutputatten