HP-427A-Manual 电路图.pdf

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1、HP Archive This vintage Hewlett Packard document was preserved and distributed by Pleasevisituson the web! Scanned by on-line curator: Tony Gerbic * For FREE Distribution Only * RadioFans.CN 收音机爱 好者资料库 oERATINGANDSERVICEMANUAL VOLTMETER 427A ctf;HEWLETTACKARD FUNCTION 427AVOLTMETER RANGE HEWLETTi:IJ

2、PACKARD RadioFans.CN 收音机爱 好者资料库 = .-HEWLETTillPACKARD-. CERTIFICATION TheHewlett-PackardCompanycertifies thatthisinstrumentwas thoroughlytestedandinspectedandfoundtomeet itspublished specificationswhenitwasshippedfromthefactory.TheHewlett- PackardCompanyfurther certifies that itscalibrationmeasure-

3、mentsaretraceabletotheU.S.NationalBureauof Standardsto theextentallowedbytheBureauscalibrationfacility. WARRANTYANDASSISTANCE AllHewlett-Packard products are warranted against defects in materials and workmanship. This warranty applies for one year from the date of delivery, or,inthe case of certain

4、 major compo- nents listedinthe operating manual, for the specified period.We will repair or replace products which prove tobedefective during thewarrantyperiodprovidedtheyarereturnedtoHewlett- Packard.Noother warrantyisexpressed or implied.Weare not liable for consequential damages. Service contrac

5、ts or customer assistance agreements are available for Hewlett-Packard productsthatrequire maintenance and re- pair on-site. For any assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addresses are providedatthe back of this manual. RadioFans.CN 收音机爱 好者资料库 OPERATINGANDSERVICE

6、MANUAL -hp-PartNo. 00427-90005 MODEL427A VOLTMETER Serials Prefixed: 947- AppendixC,Manual Backdating Changes, adapts manualtoserials prefixed 550-,621-, 731- Copyright Hewlett-Packard Company 1969 P.O. Box 301, Loveland, Colorado, 80537 U.S.A. Printed:AUG 1972 Model 427ATableofContents TABLEOFCONTE

7、NTS SectionPage IVTHEORYOFOPERATION.4-1 4-1.GeneraL.4-1 4-5.DCOperation. .4-1 4-7.OhmsOperation. . . . .4-1 4-9.ACOperation. .4-1 4-12.CircuitDescriptions.4-2 4-13.DCAmplifier(A1). . . . . .4-2 4-16.DCOffset(A2). . . . .4-2 4-19.ACMeteringCircuit(A2). .4-3 4-23.BatteryRegulatorA14-3 Section IIINSTAL

8、LATION Section IGENERAL INFORMATION . . 1-1.Description. 1-5.Battery. 1-7.InstrumentandManual Identification. . . . . 1-10.AvailableAccessories. 1-12.CablesandAdapters 1-13.Probes. 5-4 5-4 5-1 5-2 5-2 5-3 5-3 5-5 5-5 5-5 5-6 5-6 5-6 5-6 5-6 5-7 5-7 5-7 5-7 5-7 5-8 5-8 5-8 5-8 5-8 5-9 5-9 5-9 5-9 Pag

9、e Page .6-1 .6-1 Page 7-1 . .7-1 7-1 7-1 5-27. 5-30. 5-14. 5-16. 5-18. 5-20. 5-25. 5-42. 5-45. 5-47. 5-50. 5-52. 5-54. 5-56. 5-60. 5-63. 5-67. 5-71. 5-73. 5-75. 5-77. 5-80. 5-82. Section VMAINTENANCE(Contd) 5-7.ACAccuracyandFrequency ResponseCheck. . . . . ResistanceAccuracyCheck. DCAccuracy. ACReje

10、ctionCheck. . InputImpedanceCheck. AdjustmentandCalibration Procedures. . . . . . . CoverRemoval. . . . . AmplifierBalanceandZero OffsetAdjustment. . . . 5-31.RegulatorAdjust. 5-32.ACCalibration. 5-36.ResistanceInfinityAdjustment 5-38.DCCalibration. 5-40.AlternatePerformanceChecks andCalibrationProc

11、edures. ACCircuits. . . . . ResistanceCircuits. DCCircuits. ACRejection. InputImpedanceCheck BatteryReplacement. Troubleshooting. . . . . PowerSupply . . . . . DCAmplifier. . . . ACMeteringCircuit. AdjustmentofFactorySelected Components A1R19*. A2C2* . A2R14* A2R16* EtchedCircuitBoardRepair. Section

12、 VICIRCUIT DIAGRAMS. . 6-1.Introduction. Section VIIREPLACEABLEPARTS. 7-1.Introduction. 7-4.OrderingInformation. 7-6.Non-ListedParts. 1-1 1-1 1-1 1-1 3-1 3-1 3-1 3-1 3-1 3-1 3-2 3-2 Page 1-1 1-1 1-1 Page 2-1 2-1 2-1 2-1 2-1 2-1 2-1 2-1 2-1 2-1 Page 3-1 3-1 Introduction. InitialInspection PowerRequir

13、ements. GroundingRequirements. Installation. . . . . BenchMounting . . . . RackMounting. CombinationMounting RepackagingforShipment 2-1. 2-3. 2-5. 2-7. 2-10. 2-12. 2-14. 2-16. 2-18. OPERATING INSTRUCTIONS 3-1.Introduction. 3-3.FrontandRearPanel Description. . . . 3-5.OperatingInstructions 3-6.Mechan

14、icalZeroAdjustment 3-8.Turn-OnProcedure. 3-11.DCMeasurements. 3-12.ResistanceMeasurements 3-13.ACMeasurements. 3-16.DBMeasurements. Section III Section VMAINTENANCE. 5-1.Introduction. 5-3.RequiredEquipment. 5-5.PerformanceChecks Page 5-1 5-1 5-1 5-1 Appendix ACODE LISTOFMANUFACTURERS BSALESANDSERVIC

15、EOFFICES CMANUAL BACKDATING CHANGES Number 1-1.Specifications. 3-1.EffectsofHarmonicDistortion. 3-2.DBRangeIdentification. 5-1.RequiredTestEquipment. 5-2.ResistanceAccuracyCheck. LISTOF Page 1-0 3-2 3-2 5-0 5-2 TABLES Number 5-3.1%Resistors. 5-4.Troubleshooting. 5-5.PowerSupplyVoltages 5-6.ACMeterin

16、gCircuitVoltages 7-1.ReplaceableParts. Page 5-7 5-7 5-8 5-8 7-1 01791-2 iii TableofContents LIST OFILLUSTRATIONS Model 427A NumberPageNumberPage 1-1.Model 427AVoltmeter. . 1-05-2.ResistanceAccuracyCheck 5-2 1-2.11096AHighFrequencyProbe.1-15-3.DCAccuracyandLinearityCheck.5-2 3-1.LocationofFrontPanelC

17、ontrols5-4.ACRejectionCheck.5-3 andIndicators.3-05-5.InputImpedanceCheck.5-4 3-2.ImpedanceCorrectionGraph3-35-6.LocationofInternalAdjustments.5-5 4-l.SimplifiedBlockDiagram4-05-7.BatteryReplacement.5-7 4-2.DCOperation. .4-1 4-3.OhmsOperation4-26-1.Locationof SwitchComponents.6-2 4-4.ACOperation4-26-

18、2.ComponentLocation.6-3 4-5.DCOffsetCircuit.4-36-3.SchematicDiagram6-3 5-l.ACAccuracyandFrequency ResponseCheck. . . 5-07-1.LocationofMechanicalParts.7-0 iv 01791-2 SectionI Figure1-1.Model 427AVoltmeter Table1-1.Specifications Model 427A ACVOLTMETER(Contd) InputImpedance:10megohmsshuntedby 40pFon10

19、 mVto1 Vranges;20 pf on 3 Vto300 Vranges. Response:Respondstotheaveragevalueofthein- put;calibratedinrmsvoltsforasinewaveinput. Overload: 300 V/rmsmomentarily,1Vrangeand below. 425 V/rmsmaximumabove 1Vrange. OHMMETER ResistanceRanges:10ohmscenterscaleto10meg- ohmscenterscale(7ranges). Accuracy:5%ofr

20、eadingatmidscale(OOCto+500C). Polarity:Commonterminalnegative. SourceCurrent: DCVOLTMETER VoltageRanges:100mVto1000 Vfullscaleina 1,3,10sequence(9ranges). Accuracy:2%offullscaleonanyrange(OOCto 50oC). InputResistance:10megohmsonallranges. ACRejection:Superimposedpeakacvoltages(60 Hz and above)100tim

21、esgreaterthanfullscale affectsreadinglessthan1%.Maximum450 voltspeak. Overload:1200 Vdc onanyrange. ACVOLTMETER VoltageRanges:10mVto300 Vrmsfullscaleina 1, 3,10sequence(10ranges). FrequencyRange:10Hzto1 MHz. Accuracy:(OOCto500C). RANGE2%OFFULLSCALE O.01 V - 30 V10 Hz - 1 MHz 100 V - 300 V10 Hz - 100

22、 KHz FrequencyResponse: RANGE X10 X100 X1K X10K X100K X1M X10M OPENCIRCUIT VOLTAGE 0.1V 0.1V 1V 1V 1V 1V 1V SHORTCmCUIT CURRENT 10rnA 1rnA 1rnA 100J.LA 10J.LA 1J.LA 0.1J.LA 3dB-r-.-r-.-,.-,-, 2dB IdB. O-+-,-p-+-F-:0111/-+-l -, 1Hz5Hz10HzIMHz2MHz3MHz4MHz Frequencyresponse10 mVto30Vranges. 1-0 GENERAL

23、 FloatingInput: Maybeoperatedupto500 Vdcabove ground.(Ohms inputopeninanyfunctionexcept ohms-voltsinputopenwheninstrumentisin off position.) Power:22-1/2voltdrycellbattery.(EvereadyNo. 763orRCA VS102.) Option 01:Batteryoperationandaclineopera- tion(selectableonrearpanel).115or230 V 20%,50Hzto400Hz.1

24、/2W. 01791-2 Model 427A SECTIONI GENERALINFORMATION Section I 1-1.DESCRIPTION. 1-2.TheHewlett-PackardModel 427Aisaversatile, compact,self-containedvoltmeter.Itiscapableof makingdcmeasurementsfrom1 mVto1000volts,ac measurementsfromO.3mVto300voltsatfrequencies from10 Hzto1 MHz,andresistancemeasurement

25、s from0.2ohmsto500megohms.Withthe01option, theModel 427Amaybepoweredeitherby a 115or 230voltlineorbyaninternal22-1/2voltdrycell battery. 1-3.Theuseofsolidstatecomponentsthroughout givestheModel 427Abothruggednessandreliability. Batteryoperationmakestheinstrumentidealforfield useorisolationfromcommon

26、modegroundloops. 1-4.Figure1-1showstheModel 427A,andTable1-1 containsalistoftheModel 427ASpecifications. 1-5.BATTERY. 1-6.ThebatteryusedintheModel 427Aisa22-1/2 voltdrycell,EvereadyNo. 763oranRCA VS102. Typicalbatterylifeismorethan300hourscontinuous operationor700hoursintermittentoperation. 1-7.INST

27、RUMENTANDMANUAL IDENTIFICATION. 1-8.Hewlett-Packardusesatwo-sectionserialnum- ber.Ifthefirstsection(serialprefix)of theserial numberonyourinstrumentdoesnotagreewiththose onthetitlepage ofthismanual,changesheetssup- pliedwith themanualwilldefine thedifferencesbe- tweenyourinstrumentandthe Model 427Ad

28、escribed inthismanual.Someserialnumbersmayhave alet- terseparatingthetwosectionsofthenumber.This letterindicatesthecountryin whichtheinstrument wasmanufactured. 1-9.Ifaletterprefixestheserialnumber,the instrumentwasmanufacturedoutsidetheUnited states. 1-10.AVAILABLEACCESSORIES. 1-11.Thefollowingacce

29、ssoriesareavailabletoin- creasethetestcapabilitiesoftheModel 427A. 1-12.CABLESANDADAPTERS. -hp-11001A45testlead,dualbananatoBNC male -hp-11002A 5testlead-dualbananatoalligator clips -hp-11003A5testlead-dualbananatopencil probeandalligatorclip -hp-10111AshieldedBNCfemaletobanana plugadapter 1-13.PROB

30、ES. -hp-Model1l074A10:1 VoltageDividerProbe extendsthevoltagerangeof Model 427A by a factorof 10. -hp-Model1l039A1000:1CapacitiveVoltage Dividerformeasuringvoltagesupto24 KV. -hp-Model1l096AHighFrequencyProbeex- tendsthefrequencyrangeofthe427Ato500 MHz. ThevoltagerangeisO.25Vto30V. 01791-2 Figure1-2

31、.1l096AHighFrequencyProbe 1-1 Model 427A SECTIONII INSTALLATION Section II 2-1.INTRODUCTION. 2-2.Thissectioncontainsinformationandinstruc- tionsnecessaryforinstallationandshippingof Model 427AVoltmeter.Includedareinitialinspectionpro- cedures,powerandgroundingrequirements,install- ation,andinstructi

32、onsforrepackagingforshipment. 2-3.INITIALINSPECTION. 2-4.Thisinstrumentwascarefullyinspectedboth mechanicallyandelectricallybeforeshipment.It shouldbephysicallyfreeofmarsorscratchesandin perfectelectricalorderuponreceipt.Toconfirm this,theinstrumentshouldbeinspectedforphysical damageintransit.Also,t

33、esttheelectricalperform- anceoftheinstrumentusingtheprocedureoutlinedin Paragraph5-5.Ifthereisdamageordeficiency,see thewarrantyontheinsidefrontcoverofthismanual. 2-5.POWERREQUIREMENTS. 2-6.TheModel 427Ausesa 22. 5voltdrycellbattery foritsprimarypowersource.However,if Option01 isincluded,theModel 42

34、7Acanbeoperatedfromany sourceof 115or230volts(20%)at50to400 Hz. Withtheinstrumentdisconnectedfromtheacpower source,movetheslideswitch(locatedontherear panel)untilthedesiredlinevoltageappears.Power dissipationislessthan1/2wattmaximum. 2-7.GROUNDINGREQUIREMENTS. 2-8.Toprotectoperatingpersonnel,theNati

35、onal ElectricalManufacturersAssociation(NEMA)recom- mendsthattheinstrumentpanelandcabinetbeground- ed.TheOption01427Aisequippedwithathree- conductorpowercablewhich, when pluggedintoan appropriatereceptacle,groundstheinstrument.The offsetpinonthepowercablethree-prongconnector isthegroundwire. 2-9.Top

36、reservetheprotectionfeaturewhenoperating theinstrume:ltfromatwo-contactoutlet,useathree- prongtotwo-prongadapterandconnectthepigtailon theadaptertoground. 2-10.INSTALLATION. 2-11.TheModel 427Aisfullytransistorized;there- fore,nospecialcoolingisrequired.However,the instrumentshould notbeoperatedwhere

37、theambient temperatureexceeds+550C (1310F).Foradditional information,addressinquiriestoyourlocal-hp- SalesandServiceOffice.(See Appendix Bforoffice locations.) 2-12.BENCH MOUNTING. 2-13.Model 427Aisshippedwithplasticfeetandtilt standinplace,readyforuseasabenchinstrument. 01791-3 2-14.RACK MOUNTING.

38、2-15.Model 427Amayberackmounted byusingan AdapterFrame(-hp-PartNo. 5060-0797).Theadapt- erframeisarackframethatacceptsanycombination ofsubmodularunits.Itcanberackmounted only. 2-16.COMBINATION MOUNTING. 2-17.TheModel 427Amaybemounted incombination withothersubmodularunitsbyusinga CombiningCase (-hp-

39、Model1051A).Ifthe427Aisequipped with a carryinghandle,itwillbenecessarytoremovethe topcoveron 427AbeforeinsertingitintotheCom- biningCase.TheCombiningCaseisafull-module unitwhichacceptsvariouscombinationsofsubmodular units.Beingafull-moduleunititself,itcanbebench orrackmounted andisanalogoustoanyful

40、l-module instrument. 2-18.REPACKAGINGFORSHIPMENT. 2-19.Thefollowingparagraphscontainageneralguide forrepackagingoftheinstrumentforshipment.Refer toParagraph2-20iftheoriginalcontaineristobe used;2-21ifitisnot. -NOTE- Iftheinstrumentistobeshippedto Hewlett-Packardforserviceorrepair, attachatagtotheins

41、trumentidentifying theownerandindicatingtheserviceor repairtobeaccomplished;includethe modelnumberandfullserialnumberof theinstrument.In anycorrespondence, identifytheinstrumentbymodelnumber, serialnumber,andserialnumberprefix. 2-20.Iforiginalcontaineristobeused,proceedas follows: a.Placeinstrumenti

42、noriginalcontainer.If originalcontainerisnotavailable,asuitable containercanbepurchasedfromyournear- est-hp-SalesandServiceOffice. b.Ensurethatcontaineriswellsealedwith strongtapeormetalbands. 2-21.Iforiginalcontainerisnottobeused,proceed asfollows: a.Wrapinstrumentinheavypaperorplastic beforeplacin

43、ginaninnercontainer. b.Placepackingmaterialaroundallsidesofin- strumentandprotectpanelfacewithcardboard strips. c.Placeinstrumentandinnercontainerina heavy cartonorwoodenbox andsealwithstrongtape ormetalbands. d.MarkshippingcontainerwithDELICATE INSTRUMENT, FRAGILEetc. 2-1 SectionIII MODEL427AFRONT

44、PANEL ,/ CDBATT/LINE(option01only)slideswitch:Se- lectseitherbatteryorlineoperation. CD115/230slideswitch(option01only):Selects either115 Vacor230Vacforlineoperation. CDLine input (option01only):Connectsac operatingpowertoinstrument. RANGE switch:Selectsappropriaterangeof unknown input. CDDCZERO/noo

45、thumbwheel: Used toelectrical- lyzerotheinstrumentinDCmode andtoinfinity- settheinstrumentinOHMSmode. OHMSterminal:Connectsunknownresistance toinstrument. Model 427A MODEL427AREAR PANEL (OPTION01) o LINE CD o CDCOMterminal:Connectstoinstrumentcom- mon. (Common inputforACV,OHMSand DCV.) VOLTSterminal

46、:Appliesunknownacordc voltagetoinstrument. FUNCTION switch:Selectsmode ofoperation. SelectionsareOFF,BATT, +DC, -DC,OHMS and AC. Mechanicalzero:Mechanicallyzeroesthe meter. Meterface:Displaysthemagnitudeof unknown resistanceorvoltage inohmsorvoltsrespec- tively. 3-0 Figure3-1.LocationofFrontPanelCon

47、trolsandIndicators 01791-2 Model 427A 3-1.INTRODUCTION. SECTIONIII OPERATINGINSTRUCTIONS 3-10.OPTION 01 INSTRUMENT. Section III 3-2.TheModel 427Amaybeoperatedasa dcvolt- meter,acvoltmeter,ohmmeterordBmeter.This sectioncontainsoperatinginstructionsforeachmode ofoperation. 3-3.FRONTANDREARPANELDESCRIP

48、TION. 3-4.Figure3-1showsthelocationofalltheModel 427Acontrolsandindicatorsandexplainsthefunction ofeach.The Option01rearpanelisshown.The standardrearpanelisblank. 3-5.OPERATINGINSTRUCTIONS. -NOTE- Toobtainmaximumbatterylife, settheFUNCTIONswitchofOFF whentheinstrumentisnot inuse. 3-6.MECHANICAL ZERO

49、 ADJUSTMENT. 3-7.Beforeanymeasurementsaremade,complete theMechanicalZeroAdjustmentinthefollowingsteps. a.Besureinstrumenthasbeenoffforatleast oneminute. b.RotateMechanicalZeroAdjustmentscrew CLOCKWISE untilmeterpointeristotheleft ofzeroand movingupscaletowardzero. c.Continuetorotateadjustmentscrewclockwise. STOP whenneedleisexactlyonzero.If needleovershoots,repeatstepb. d.Whenpointerisexactlyoverzero,rota