HP-651B-Manual-sn-647 电路图.pdf

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1、HP Archive This vintage Hewlett Packard document was preserved and distributed by Please visit us on the web ! Prepared by on-line curator: Tony Gerbic For FREE Distribution Only * RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 RadioFans.CN 收音机爱 好者资料库 01810-1 OPERATINGANDSERVICEMANUAL (HPPARTNO.006

2、51-90004) MODEL651B TESTOSCILLATOR SERIALSPREFIXED:647- CopyrightHewlett-PackardCompany1966 P.O.Box 301,Loveland,Colorado,80537U.S.A. Printed:OCT1966 Model651BTableofContents 5-2 5-2 5-3 5-3 5-4 5-7 5-4 5-4 5-4 5-4 5-7 5-7 Page Page 1-1 7-1 7-1 7-1 5-8 5-8 5-8 5-9 5-9 5-9 5-9 .5-11 .5-12 .5-12 Page

3、.6-1/6-2 .6-1/6-2 5-25. 5-23. 5-24. 5-17. 5-20. 5-21. 5-22. Section VMAINTENANCE (Contd) 5-10.OutputImpedanceCheck. 5-11.MonitorFlatnessCheck. 5-12.FrequencyResponseCheck 5-13.DistortionCheck. 5-14.AttenuationCheck. 5-15.AdjustmentandCalibration. Procedure. CoverRemoval. PowerSupply VoltageAdjustmen

4、t FrequencyDialCalibration X100, X1K, and XlOKRange FrequencyCalibration X10RangeFrequencyCalibration X1MRangeFrequency Calibration X100KRangeFrequency Calibration. . 5-26.10 MHzFlatnessAdjustment 5-27.OutputAdjustment. 5-30.MinimumDistortionAdjustment. 5-31.OutputMonitorCalibration 5-32.Troubleshoo

5、tingProcedure. . 5-37.TroubleshootingInformation. 5-39.ServicingEtchedCircuitBoards 5-41.ServicingRotarySwitches. 5-43.ServicingTunerAssembly. BSALES AND SERVICEOFFICES Appendix ACODE LISTOFMANUFACTURERS Section VICmCUITDIAGRAMS. 6-1.Introduction. Section VIIREPLACEABLEPARTS 7-1.Introduction. 7-4.Or

6、deringInformation 7-6.Non-ListedParts. Page 2-1 2-1 2-1 2-1 2-1 2-1 2-1 Page 3-1 3-1 3-1 3-1 3-1 Page 4-1 4-1 4-1 4-1 4-2 4-2 4-2 4-2 4-3 Page 5-1 5-1 5-1 5-1 5-1 5-2 5-2 TABLEOFCONTENTS Page 1-1 1-1 1-1 1-1 1-1 1-1 1-1 Section IGENERAL INFORMATION . 1-1.Description. 1-5.Accessories 1-7.Options. 1-8

7、.Option 01 1-10.Option 02 1-12.InstrumentIdentification. Section nINSTALLATION. 2-1.Inspection. . . . . . 2-3.PowerRequirements. 2-5.Three-ConductorPowerCable 2-8.Installation. 2-10.Rack/BenchInstallation. 2-12.RepackagingforShipment Section illOPERATINGINSTRUCTIONS 3-1.Introduction. 3-3.Controlsand

8、Indicators 3-5.AdjustmentofMechanicalZero 3-7.Operation. . . . . . . . . . . Section IVTHEORYOFOPERATION 4-1.GeneralDescription 4-3.CircuitDescription 4-5.OscillatorCircuit. 4-13.PeakDetector. 4-17.PowerAmplifier 4-19.MonitorCircuit. 4-21.OutputAttenuator. 4-24.RegulatedPowerSupply Section VMAINTENA

9、NCE. 5-1.Introduction. . . . . . 5-3.RequiredTestEquipment 5-5.PerformanceChecks. 5-7.DialAccuracyCheck. 5-8.OutputMonitorCheck. 5-9.OutputVoltageCheck. LISTOFTABLES Number 1-1.Specifications. . . . . . 1-2.Accessories. 5-1.RequiredTestEquipment. 5-2.DialAccuracyTest. . . 5-3.MonitorFlatnessCheck. P

10、age 1-0 1-1 5-0 5-1 5-3 Number 5-4.FrequencyResponseCheck 5-5.FrequencyRangeSwitchPadding Resistors. 7-1.ReplaceableParts Page 5-3 5-7 7-4 LISTOFILLUSTRATIONS Number 1-1.Model 651BTestOscillator. 3-1.LocationofControlsandIndicators. 3-2.ImpedanceCorrectionGraph 4-1.RCNetworkCharacteristics 4-2.PeakD

11、etectorCircuit. . . 5-1.DialAccuracyCheck. . . . 5-2.OutputMonitor,VoltageCheck 5-3.MonitorFlatnessCheck. 5-4.DistortionCheck. Page 1-0 3-0 3-2 4-1 4-2 5-1 5-2 5-3 5-3 NumberPage 5-5.AttenuationCheck. . . . . . . .5-4 5-6.A2TP2TestLeadConnection. .5-5 5-7.LocationofInternalAdjustments5-6 5-8.Trouble

12、shootingTree. . . . . .5-10 6-1.BlockDiagram. . . . . . . . . . .6-3 6-2.OscillatorCircuit6-4and6-5/6-6 6-3.MonitorCircuitandPowerSupply6-7/6-8 7-1.FrequencyTuningAssembly7-2 7-2.ChassisMechanicalParts. . .7-3 iii SectionIModel 651B Figure1-1.Model 651BTestOscillator Table1-1.Specifications 1-0 Freq

13、uencyRange:10 Hz to10MHz, 6bands.dial calibration:1to10. FrequencyResponse: Flatwithin:2%100 Hz to 1 MHz 3%10Hzto100 Hz 4%1 MHz to10MHz* DialAccuracy:(Includingwarm-updriftand 10%linevoltagevariation). 2%,100 Hz to 1 MHz 3%,10Hzto100 Hz, 1MHzto10MHz Output:200mW(3.16V)into50ohms;16mW (3.16V)into 600

14、ohms;6.32Vinto opencircuit. Attenuator: Range:90dBin10dBsteps OverallAccuracy:D.1 dB.3mVto 3V range;O.2dB. 1 mVrange *Thisspecificationappliesonlyat50ohmout- put.Theresponseabove1 MHzatthe600 ohmsoutputisaffectedbycapacitiveloads. AmplitudeControl:20dBrange(nominal). Output Monitor:Voltmetermonitors

15、levelatin- put ofattenuatorinvoltsordB.Topscale calibratedinvolts,bottomscalecalibrated in dB. Accuracy:2%atfullscale Flatness:1%atfullscale,20Hzto4 MHz 2%atfullscale.10Hzto20Hz, 4 MHzto10MHz Distortion:Lessthan1%,10Hzto5 MHz, lessthan2%at10MHz. HumandNoise:Lessthan0.05% ofmaximum ratedoutput. Tempe

16、ratureRange:00to+500C. Power:115V/230V10%,50to 1000 Hz,30watts. Dimensions:5-7/32high.16-3/4wide.13-1/4 deep(132,6x425x336 mm). 01810-1 Model 651B 1-1.DESCRIPTION. SECTIONI GENERALINFORMATION 1-7.OPTIONS. Section I 1-2.TheHewlett-PackardModel 651BTestOscilla- torisawiderangecapacitance-tunedoscillat

17、orcov- eringafrequencyrangefrom10Hzto10MHz.The oscillatorhasastablesine-waveoutputsignalthatis adjustablefrom10microvoltsto3.16voltsinto50or 600ohms.The Model 651BTestOscillatorisshown inFigure1-1andthespecificationsaregivenin Table1-1.Thismanualiswrittenforthestandard Model 651BTestOscillator;refer

18、toparagraph1-7 fordifferencesbetweenthestandardinstrumentand Options 01 and 02. 1-3.Two outputimpedancesareprovidedatfront paneloutputconnectors.The600 ohmconnectorpro- videsan outputwithanimpedancethatiscompatible withtransmissionlinesandmanydistributionsystems. The50ohmconnectorprovidesanoutputwhe

19、rea low- sourceimpedanceisdesired. 1-4.TheModel 651BTestOscillatoroutput voltage isconstantlymonitoredattheinput oftheattenuator byaninternalvoltmeter.Thevoltmeterhastwo scalesforRMS voltagereadingsandadBmscaleref- erencedto1milliwattinto50ohms.TheOUTPUT ATTENUATOR,inconjunctionwiththeAMPLITUDE cont

20、rol,providesamonitoredoutput ofdesiredlevel whenmatchedinto a50or600 ohm load. 1-5.ACCESSORIES. 1-6.Table1-2containsalistoftheaccessories whichwillincreasetheusefulnessoftheModel 651B. 1-8.OPTION 01. 1-9.Option 01isastandard-hp-Model 651BTest OscillatorthathasthedBmscaleoftheoutputmoni- torreference

21、dto1milliwattinto 600ohms.Thefront panelOUTPUT ATTENUATOR dBmmarkingshave beenchangedtocorrespondwiththesignallevelat the600noutputconnector(-80to+10DBM). 1-10.OPTION 02. 1-11.Option 02isastandard-hp-Model 651BTest Oscillatorthathasoutputimpedancesof75ohmsand 600 ohms.Also,theoutputmonitorhasthedBms

22、cale referencedto1milliwattinto 75ohms. 1-12.INSTRUMENTIDENTIFICATION. 1-13.Hewlett-Packardusesatwo-sectioneight-digit serialnumber(000-00000).Ifthefirstthreedigits oftheserialnumberonyourinstrumentdo notagree withthoseonthetitlepageofthismanual,change sheetssuppliedwiththemanualwilldefinedifference

23、s betweenyourinstrumentandtheModel 651Bdescribed inthismanual. 1-14.Ifaletterprefixestheserialnumber,the instrumentwasmanufacturedoutsidetheUnited States. Table1-2.Accessories -hp-Model10110A,BNCtoBindingPostAdapter:-hp-Model 11005ALineMatchingTransformer: Convertsa BNCconnectortobindingpostProvides

24、fullybalanced600noutputfrom connectors.single-endedinput. -hp-Model 11004ALine-MatchingTransformer:-hp-Model 11048BFeed-ThruTermination: Providesfullybalanced135nor600noutputPrecision50nfeed-thruterminationwith fromsingle-endedinput.maleandfemaleBNCconnectors. 01810-11-1 Model651B 2-1.INSPECTION. SE

25、CTIONII INSTALLATION 2-10.RACK/BENCHINSTALLATION. SectionIT 2-2.Thisinstrumentwascarefullyinspectedboth mechanicallyandelectricallybeforeshipment.It shouldbephysicallyfreeofmarsorscratchesandin perfectelectricalorderuponreceipt.Toconfirm this,theinstrumentshouldbeinspectedforphysical damageintransit

26、.Also,checkforsuppliedacces- sories.andtesttheelectricalperformanceofthe instrumentusingtheprocedureoutlined inPara- graph5-5.Ifthereisdamageordeficiency,seethe warrantyontheinsidefrontcoverofthismanual. 2-3.POWERREQUIREMENT.S. 2-4.The Model 651Bwilloperatefromeither115or 230 Vac,50- 1000 Hz.Theinst

27、rumentcanbeeasily convertedfrom115to230 voltoperationby changing thepositionoftheslideswitchlocatedontherearpanel, sothatthedesignationappearingontheswitchmatches thenominalvoltage ofthepowersource.A0.4amp- ere,slow-blowfuseisusedforboth115 and 230 volt operation. 2-5.THREE-CONDUCTORPOWERCABLE. 2-6.

28、Toprotectoperatingpersonnel,theNational ElectricalManufacturersAssociation(NEMA)recom- mendsthattheinstrumentpanelandcabinetbeground- ed.AllHewlett-Packardinstrumentsareequipped withathree-conductorpowercable,which, whenplug- ged intoanappropriatereceptacle.groundsthein- strument.Theoffsetpinonthepo

29、wercablethree- prongconnectoristhegroundwire. 2-7.Topreservetheprotectionfeaturewhenoperat- ingtheinstrumentfromatwo-contactoutlet,usea three-prongtotwo-prongadapterandconnectthe greenpigtailontheadaptertoground. 2-8.INSTALLATION. 2-9.The Model 651Bisfullytransistorized;there- forenospecialcoolingis

30、required.However,the instrumentshould notbeoperatedwheretheambient temperatureexceeds550C (131oF). 01810-1 2-11.TheModel 651Bisinitiallyshippedasabench- typeinstrument(unlessorderedspecificallyasarack type)withplasticfeetand atiltstandinplace.Con- versiontoarack-mountedinstrumentcanbe accomplishedby

31、usingtherackmountingkitand instructionsfurnishedwithyourinstrument. 2-12.REPACKAGINGFORSHIPMENT. 2-13.Thefollowingisageneralguideforrepackaging forshipment.Ifyou have anyquestions,contactyour local-hp-SalesandServiceOffice.(See Appendix Bforofficelocations.) -NOTE- Iftheinstrumentistobeshipped toHew

32、lett-Packardforservice orrepair,attachatagtothein- strument,identifyingtheowner andindicatingtheserviceor repairtobeaccomplished;include themodelnumberandfullserial numberoftheinstrument.Inany correspondence,identifythein- strumentbymodelnumber,serial numberandserialnumberprefix. a.Placeinstrumentin

33、originalcontainer. if available.Iforiginalcontainerisnotavail- able,asuitableonecanbepurchasedfrom yournearest-hp-SalesandServiceOffice. Iforiginalcontainerisnotused, b.Wrapinstrumentinheavypaperorplastic beforeplacinginaninnercontainer. c.Useplenty ofpackingmaterialaroundall sidesofinstrumentandpro

34、tectpanelfaces withcardboardstrips. d.Placeinstrumentandinnercontainerin a heavycartonorwooden box andsealwith strongtapeormetalbands. e.MarkshippingcontainerwithDelicateIn- strument,Fragileetc. 2-1 Sectionill VERNIER Model65lB OUTPUT ATTENUATOR AMPLITUDE -0D iII oI 00 - o FREQUENCY Dial:Variesoutpu

35、tfrequency withineachfrequencyrange.Dialreading multiplied byrangesettingistheoutputfre- quency oftheinstrument. CDFREQUENCY RANGE Switch (S1):Selects one ofsixfrequencyranges,from10Hzto 1 MHz. CD CD Output Monitor (M1):Monitorstheamplitude ofthetestoscillatoroutput. MechanicalZeroAdjust: Allows out

36、putmoni- tortobemechanicallyzeroed,wheninstru- mentisoff, OUTPUT ATTENUATOR:Attenuatestestos- cillatoroutput in ninestepsot10 dBeach. OutputConnectors(J2andJ3):Providesthe outputsignal,atimpedancelevelsof50nand 600(20(75nand600non Opt. 02). 0)AMPLITUDE COARSE and FINEControls: Controlsamplitudeofsig

37、nalappliedtoOUT- PUTATTENUATOR. eDFREQUENCY VERNIER:Providesafine frequencyadjustmentforFREQUENCYdial. oLINEONSwitch (S3) andPilotLamp:Switch appliesprimarypowertoinstrument;pilot lampglowstoindicateapplicationofprimary power. 115/230 V Slide Switch (S4):Setsinstrument tooperatefromaprimarypowersour

38、ceof either115 Vacor230 Vac. FUSE(F1):.0.4ampfuseprotectsinstrument fromoverloads. PrimaryPowerConnector(J1):Connects primarypowertotestoscillator. 3-0 Figure3-1.LocationofControlsandIndicators 01810-1 Model 651BSectionm SECTIONIII OPERATINGINSTRUCTIONS 3-1.INTRODUCTION. 3-2.TheModel 651BTestOscilla

39、torgeneratesa stablesinewaveoutputthatisavailableatoutputim- pedancelevelsof 600ohmsand50ohms.Thefre- quency oftheoutputisvariablefrom10Hzto10MHz, andtheoutputpowerlevelcanbevariedfrom10 microvoltsto3.16voltsinto 600or50ohmloads. Theamplitudeoftheoutputwillbeindicatedonthe outputmonitor,M1. 3-3.CONT

40、ROLSANDINDICATORS. 3-4.Figure3-1identifiesanddescribesthefunction ofallthefrontandrearpanelcontrols,connectors, andindicatorsontheModel 651B. 3-5.ADJUSTMENTOFMECHANICALZERO. e.Connect loadtooutputconnectorhavingan impedancewhichmatchesimpedanceof load. f.AdjustAMPLITUDEcontrolsfordesiredout- putvolt

41、age,asindicatedon outputmonitor. g.Theoutputmonitor,Ml,indicatestherms valueoftheoutput voltage,andthepower levelin dBmforresistiveloadsof50ohms. Theoutputvoltagelevelisobtained bymulti- plyingthemonitorscalereadingsbythemon- itorscalemultiplierwhichappearsonthe OUTPUT ATTENUATOR switch.Usethe follo

42、wingequationandtheimpedancecorrec- tiongraphofFigure3-2to obtaintheModel 651B outputpowerlevelin dBm,forloads otherthanthosemarkedontheoutputconnec- tors. Where, RL=LoadResistance(TerminatingRe- sistance) RS=SourceResistance(OutputImped- anceofOscillator V=Model 651B Outllut Monitor Reading m 3-6.Th

43、eoutputmonitorisproperlyzero-setwhen themeterpointerrestsoverthezeromark,andthe 651Bisinnormaloperatingpositionatnormalop- eratingtemperature,andisturnedoff.Zero-set the outputmonitorasfollowsto obtainmaximum accuracyandmechanicalstability a.Turn651B on and allowittooperateforat least20minutes,tolet

44、themetermovement reachnormaloperatingtemperature. Output Voltage=R L + R S X2V m b.Turn651B off, and allow30secondsforall capacitorstodischarge. c.Insertpointedobject(suchastipofball- pointpen) intorecessonadjustmentwheel, androtatewheeluntilmeterpointerisexactly overzero. 3-7.OPERATION. 3-8.Toopera

45、tethe651BTestOscillator,proceed asfollows: a.Connectprimaryacpowerto651B (115/230V,50to1000HZ),andsetslide switchS4toproperposition. b.TurnLINEONswitchtoONposition.Indi- catorlampwillglow,verifyingapplication ofprimarypower. c.Set FREQUENCY RANGEswitchandFRE- QUENCYDialtodesiredoutputfrequency. d.Se

46、t OUTPUT ATTENUATORswitchtodesired voltagerange. 01810-1 Problem:A 600 ohm loadisplacedonthe 50ohm outputconnector.The Model 651B outputmonitorindicatesanoutput of0.9 volts,withtheOUTPUT ATTENUATORset onthe1. 0 volt(+10,dBm)range.Findthe actualoutputvoltageandpowerlevel(indBm) oftheModel 651B. Solut

47、ion:Theactualoutput voltageiscalcu- latedasfollows: 600 Output Voltage=600 +50X2 (0.9)= 1.66volts Theindicatedpowerlevelwouldbe17. 3 dBmforanoutputvoltageof 1. 66voltson the3.0volt(+20dBm)range.Theactual powerlevelisthealgebraicsumofthe indicatedpowerlevelandthecorrection factorobtainedfromtheimpeda

48、ncegraph ofFigure3-2.Forthisexampleacor- rectionof-10.8dBmisobtainedfora 600 ohm load.Theactualpowerlevelis+6. 5 dBm17.3 dBm +(-10.8dBm). 3-1 Sectionill Model 651B +25 +20 / lOOK10KIK10010 I ) -y -y o -5 +5 +15 -10 -25 1 -20 -15 +10 m Cl I Z o u w c: c: o u c: w w lTD-B-0783IMPEDANCEOHMS Figure3-2.I

49、mpedanceCorrectionGraph 3-201810-1 Model 651BSectionIV SECTIONIV THEORYOFOPERATION 4-1.GENERALDESCRIPTION. 4-2.The Model 651BTestOscillatorincludesan oscillator,poweramplifier,peakdetector,attenua- tor,andmonitorcircuit.Ablockdiagramofthein- strumentisshown inFigure6-1.Theoscillator circuitusesa modifiedWeinbridgenetworktogen- erateastable,distortionlesssinewavesignalwhich isappliedtothepoweramplifiercircuit.Thepeak detectorcircuitprovidesadegenerativefeedback voltagetotheoscillatorcircuittostabili