HP-403B-Manual-SNprefix-403 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 OPERATINGANDSERVICEMANUAL ACVOLTMETER 4038 INPUT FUNCTION0 un0 lUTON CI.VIlI, ,.StIS iIfI J/ HEWLE

2、TTPACKARD RadioFans.CN 收音机爱 好者资料库 = HEWLETTiIPACKARD CERTIFICATION TheHewlett-PackardCompanycertifies thatthisinstrumentwas thoroughly testedandinspectedandfoundtomeet itspublished specifications when itwasshippedfromthefactory.TheHewlett- PackardCompanyfurther certifies that its calibrationmeasure-

3、 mentsaretraceabletotheU.S.National Bureau of Standardsto theextent allowedbytheBureaus calibration facility. WARRANTYANDASSISTANCE AllHewlett-Packard productsarewarranted against defectsin materials and workmanship. Thiswarrantyapplies for one year from .tnedateofdelivery, or,inthe case of certain

4、major compo- nents listedinthe operating manual, for the specified period.We will repairorreplace products which prove tobedefective during thewarrantyperiodprovidedtheyarereturnedtoHewlett- Packard.Nootherwarrantyisexpressedorimplied.Wearenot liable for consequential damages. Service contractsorcus

5、tomer assistance agreementsareavailable for Hewlett-Packard productsthatrequiremaintenanceand re- pairon-site. Forany assistance, contact your nearest Hewlett-Packard Sales and Service Office. Addressesareprovidedatthe back of this manual. RadioFans.CN 收音机爱 好者资料库 OPERATINGANDSERVICEMANUAL -hp-Part N

6、o. 00403-90010 MODEL4038 ACVOLTMETER Serials Prefixed:0986A Ifotherserial prefixes re- quire modificationofthis manual, the changes will appear in Appendix C or inan associated Manual Changes supplement. Copyright Hewlett-Packard Company 1962 P. O. Box301,Loveland, Colorado, 80537 U.S.A. Printed:Jan

7、uary 1973 Mode1403BTableof Contents Page 6-1 6-1 6-1 6-1 5-3 5-3 5-4 5-4 5-4 5-5 5-5 5-5- 5-6 5-6 5-6 5-7 5-7 5-7 Page 5-1 5-1 5-1 5-1 5-2 5-2 5-2 5-3 5-3 Section VIREPLACEABLE PARTS. 6-1.Introduction. 6-4.OrderingInformation. 6-6.Non-ListedParts. 1-1 1-1 Page 3-1 3-1 3-1 3-1 3-1 3-1 3-1 3-1 3-1 3-4

8、 3-4 3-4 3-4 Page 2-1 2-1 2-1 2-1 2-1 TABLEOFCONTENTS PageSection 1-1VMAINTENANCE. 1-15-1.Introduction. 5-6.TestInstrumentsRequired. 5-8.Meter,MechanicalZero. 5-10.PerformanceChecks. 5-12.CalibrationChecks. 5-13.FrequencyResponseChecks. 5-16.Noise Check. 5-17.InputResistanceCheck. 5-18.Adjustmentand

9、Calibration Procedures. . . . . . . . 5-20.PowerSupplyAdjustment 5-21.InputResistance. 5-23.OverloadCheck. . . 5-24.CalibrationandTracking. 5-25.HighFrequencyResponse 5-26.30-VoltResponseCalibration. 5-27.Troubleshooting. . . . . . . . . . 5-29.Repair. 5-30.CabinetRemoval. 5-31.ServicingEtchedCircui

10、tBoards 5-33.TransistorReplacement. 5-35.FunctionSwitchRepair. 5-37.FluorescentIndicatorDecal. Section IGENERAL INFORMATION. 1-1.Description.: . . . . 1-5.Instrumentand Manual Identification. . . . 1-7.AccessoriesAvailable. Section IIINSTALLATION. 2-1.Inspection. 2-4.PowerRequirements. 2-6.Installat

11、ion. 2-8.RepackagingForShipment. Section illOPERATING INSTRUCTIONS 3-1.Introduction. . . . . . 3-3.FrontPanelDescription. 3-5.OperatingProcedure. . . 3-7.BatteryChargingInformation. 3-9.InstrumentTemperatureLimits. 3-11.InputProtection. . . 3-13.VoltageMeasurements. 3-18.WaveformErrors. 3-21.Decibel

12、Measurements. 3-24.ImpedanceCorrectionGraph 3-27.CurrentMeasurements. . . . 3-28.Clip-OnProbe. . . . . Section IVTHEORYOFOPERATION. 4-1.Introduction. 4-3.PreliminaryAttenuator. 4-6.InputCircuit. . . . 4-11.IntermediateAttenuator. 4-20.MeterRectifierCircuit 4-25.PowerSupply. Page 4-1 4-1 4-1 4-1 4-2

13、4-2 4-3 Appendix ACODE LISTOFMANUFACTURERS BSALESANDSERVICEOFFICES CMANUAL BACKDATING CHANGES LISTOF Page .1-1 .1-2 3-4 Number 1-1.Specifications. . . . . . . . . . . 1-2.AccessoriesAvailable. 3-1.EffectofHarmonicson Model 403B VoltageMeasurements. 3-2.Examplesof Voltage andDBMeasurements.3-4 5-1.Te

14、stInstrumentsRequired.5-1 TABLES Number 5-2.CalibrationCheckTable. . . . . . 5-3.Troubleshooting. . . . . . . . . 5-4.TestProcedureTroublesliooting . 5-5.TransistorReplacement. 6-1.ReplaceableParts. 6-2.MechanicalParts Page 5-2 5-6 5-6 5-7 6-2 6-5 Page 4-3 5-0 5-2 5-4 5-4 5-5 . 5-8 5-9/5-10 5-9/5-10

15、 . . .6-7 Number 4-6.MeterRectifierCircuit. 5-1.Model 403BTopView. 5-2.Model 403B Bottom View 5-3.OverloadCheck Setup . . . . 5-4.PerformanceCheckSetup. 5-5.FrequencyResponseSetup 5-6.Range SWitchDetail. . . 5-7.FunctionSwitchDetail. 5-8.SchematicDiagram 6-1.Exploded View. LISTOFILLUSTRATIONS PageNu

16、mber 1-1.Model 403BTransistorizedAC Voltmeter. . . . . . . . . . . . .1-0 3-1.FrontPanelDescription.3-2 3-2.VoltageMeasurements. . . . . . . . . 3-3 3-3.Model403BlmpedanceCorrectionGraph.3-5 4-1.Model403BFunctionaiBIockDiagram.4-0 4-2.InputAmplifier. . . . . . . .4-1 4-3.DiodeCurrentVs Diode Voltage

17、4-2 4-4.FixedAmplifierBlockDiagram. .4-2 4-5.MeterRectifier,SimplifiedDiagram.4-3 iii 1-0 SectionI 8 J .r I, 1 ./ I:x -s I ,;), OECI8HS / 1100 HI RANGE VOLn oe Model403BAcVoltmeterModel 403BAcVoltmeter standardOption 01 Figure1-1.Model 403BAcVoltmeter Model403B Model403B SECTIONI GENERALINFORMATION

18、Section I 1-1.DESCRIPTION. 1-2.The-hp-Model 403BTransistorizedACVolt- meterisageneralpurposeinstrumentthatmeasures rmsvaluesofacvoltagesinthe5Hzto2MHzrange. Theinstrumenthasfull-scalerangesfrom1 mVto 300volts(-72dBmto+52dBm)ina1,3,10sequence. TheModel 403Bmeterfaceiscalibratedwiththeupper scaleinvol

19、ts(rms);theModel 403B Option01meter faceiscalibratedwiththeupperscaleindB.Models 403B and 403B Option 01areshowninFigure1-1,and specificationsaregiveninTable1-1. 1-3.TheModel403BoperatesfromNickelCadmium batteries.Theinstrumentalsoincludesaself-con- tainedbatterychargerwhichoperateson115or230 voltsa

20、c. 1-5.INSTRUMENTANDMANUAL IDENTIFICATION. onthetitlepage ofthismanual,changesheetssup- pliedwiththemanualwilldefinethedifferencesbe- tweenyourinstrumentandtheModel 403Bdescribed inthismanual.Someserialnumbersmayhave alet- terseparatingthetwosectionsofthenumber.This letterindicatesthecountryinwhicht

21、heinstrument wasmanufactured. 1-7.ACCESSORIESAVAILABLE. 1-8.Toincreasetheusefulnessofyourinstrument, thefollowingaccessoriesareavailable: a.-hp-Model 11005A LineBridgingTrans- former. b.-hp-Model 11039ACapacitiveVoltage Divider. c.-hp-Model 10111ABNC-To-BindingPost Adapter. 1-6.Hewlett-Packardusesat

22、wo-sectionserialnum-1-9.Table1-2providesinformationanduseofthe ber.Ifthefirstsection(serialprefix)oftheserialaccessoriesmentionedaboveaswellasotheruseful numberonyourinstrumentdoesnotagreewiththoseaccessories. Table1-1.Specifications RANGE: O.001to300voltsrmsfullscale(12ranges)in a 1, 3,10sequence.

23、FREQUENCY RANGE: 5 Hzto2 MHz ACCURACY: %ofFullScale. MODEL 403B ACCURACY SPECIFICATION Frequencyoto500Coto-20oC 10Hzto1 MHz2%8% 5to10Hz and5% 8% 1to2 MHz MODEL 403B OPTION01ACCURACYSPECIFI- CATION Frequencyoto500Coto-20oc 10Hzto1 MHz0.2dB0.7dB 5to10Hz and0.4dB0.7dB 1to2 MHz METER: Individuallycalibr

24、ated,tautband.Respondsto averagevalueof inputwaveformandiscalibrated inthermsvalueof asinewave. NOMINAL INPUT IMPEDANCE: 2megohms;shuntedby60pFonO.001-volt toO.03-voltranges,30pFonO.1-voltto 300-voltranges. OVERLOAD PROTECTION: Fuseprotected: DCISOLATION: Signalgroundmaybe500 Vdcfromexternal chassis

25、. POWER SUPPLY: 4rechargeablebatteries(furnished).40-hour operationperrecharge(20hoursat-200C), up to500rechargingcycles(expectedbatterylifeof 20,000hours).Rechargingcircuitisself-con- tainedandfunctionsautomaticallywheninstru- mentisoperatedfromacline(115or230V10% 48to440 Hz,3watts). TEMPERATURERAN

26、GE: -20oCto+50oC. DIMENSIONS: 5-1/8in. wide,6-3/32in. high, 8 in.deep. ACCESSORIES AVAILABLE: -hp-11002ATestLeads,5ft.long,dualbanana plugtoalligatorclips.-hp-11003ATestLeads, 5 ft. long,dualbananaplugtoprobeandalligator clip. ACCESSORY FURNISHED: Detachablepowercord. 1-1 SectionI Table1-2.Accessori

27、esAvailable Model403B Model No.UseFeatures 11002ATestLeadsDualBananaPlugtoAlligatorClips 11003ADualBananaPlugtoProbeandAlligatorClip 1l01lAAdapterBindingPosttoBNC 1l005ALineBridgingTransformerTerminatingResistance:600or10Kohms Providesbalanced600-ohminputFrequencyRange:20 Hzto45 kHz tounbalanced600-

28、ohmoutputforPowerHandlingCapacity:+15dBm(4.5Vinto600n) measurementsonbalancedlines. 1l039ACapacitiveVoltageDividerAccuracy:3% (Divisionratio:1000:1)InputCapacity:15pF 1pF Max. Voltage Rating:60Hz 25 kV, 100 kHz 22 kV, 1 MHz 20 kV,10MHz15kV, 20 MHz 7 kV 456AACCurrentProbeResistanceMax.CurrentAccuracy

29、 1mY/rnA1%at1 kHz 2%50milliohms1amprms 1.5amppeak100 Hzto3 MHz 11004ALineMatchingTransformerTerminatingResistance:600or10Kohms Providesbalanced135or600ohmFrequencyRange:5 kHzto600 kHz inputto600ohmunbalancedout-PowerHandlingCapacity:22dBm(10 V into 600n) putformeasurementsonbalanced lines. 1-2 Model

30、403B SECTIONII INSTALLATION sectionII 2-1.INSPECTION. 2-2.Unpacktheinstrumentuponreceiptandinspect itforsignsofphysicaldamagesuchasscratched panelknobsetc.Ifthereisanyapparentdamage, file aclaimwiththecarrierandrefertothewarranty pageonthebacksideofthefrontcoverofthismanual. 2-3.Anelectricalinspecti

31、onshouldbeperformedas soonaspossibleafterreceipt.Toaid inelectrical inspection,performancechecksareincludedinsec- tionV,Paragraph5-10. 2-4.POWERREQUIREMENTS. 2-5.Theacpowercircuitwhichprovidescharging currenttotheNickel-Cadmiumbatteriesintheinstru- mentcanbe connectedtoa115-or230-volt, 48 - 440 Hz,s

32、ource.Aswitchlocatedontherearpanelof theinstrumentallowstheusertoselect115-or230- voltmodesofoperation. IWARNINGI WHEN THE 403BISUSED WITHOUT THEPOWER CORD, THEREISNO GROUND RETURN.USECAUTION TO AVOIDELECTRICALSHOCK. 2-6.INSTALLATION. 2-7.The-hp-Model 403Bisfullytransistorized; thereforenospecialcoo

33、lingisrequired.However, theinstrumentshould notbeoperatedwheretheam- bienttemperatureexceeds500C (1310F). 2-8.REPACKAGINGFORSHIPMENT. -NOTE- Iftheinstrumentistobeshippedto Hewlett-Packardforserviceorre- pair,attachatagtotheinstrument identifyingtheownerand indicating theserviceorrepairtobeaccom- pli

34、shed;includethemodelnumber and fullserialnumberoftheinstru- ment.Inanycorrespondence,iden- tifytheinstrumentby modelnumber, serialnumberandserialnumber prefix. 2-9.Thefollowingisageneralguideforrepacking forshipment.Ifyou have anyquestions,contactyour local-hp-SalesandserviceOffice.(seeAppendix B fo

35、rofficelocations.) a.Placeinstrumentinoriginalcontainerifavail- able.Iforiginal containerisnotavailable, onecanbepurchasedfromyournearest-hp- SalesandserviceOffice. Iforiginal containerisnotused, b.Wrapinstrumentin heavypaperorplasticbe- foreplacinginaninnercontainer. c.Useplenty of packingmateriala

36、roundallsides ofinstrumentandprotectpanelfaceswithcard- boardstrips. d.Placeinstrumentandinnercontainerina heavy cartonorwooden box andsealwithstrong tapeormetalbands. e.MarkshippingcontainerwithDelicateIn- strument,Fraileetc. 2-1 Model403B SECTIONIII OPERATINGINSTRUCTIONS sectionill 3-1.INTRODUCTIO

37、N. 3-2.Thisvoltmeterisreadyforuseuponreceipt fromthefactoryand will givespecifiedperformance afterashortwarm-upperiod.Allowapproximately 60secondswarm-upforoptimumperformance. 3-3.FRONTPANELDESCRIPTION. 3-4.Adescriptionoffrontpanelcontrolsisgiven in Figure3-1.Thedescriptionsarekeyedtothephoto thatac

38、companiesthefigure. 3-5.OPERATINGPROCEDURE. 3-6.TheoperatingprocedurefortheModel 403Bis given inFigure3-2.Instructionsarekeyedtothe photothataccompaniesthefigure. 3-7.BATTERYCHARGINGINFORMATION. 3-8.The403Bhasaself-containedbatterycharger. Thisinstrumentiscontinuallychargingthebatteries whenevertheF

39、UNCTIONswitchisONandtheline cordconnectedtoa 115or230 voltsource.Inthe eventofcompletedischarge,the403Bcanbeused aftertwentyminutesofrechargingwiththelinecord connectedtoanacsource.Completerechargerequires approximately60hours(depending onsettingof R39) whentheNickel Cadmiumcellsarecompletelydis- ch

40、arged.(RefertoSection IV,Paragraph4-25). THE FOUR NICKEL CADMIUMBAT- TERIESIN THE-HP-403B ARE IN HERMETICALLY-SEALED CONTAIN- ERS. UNDERHIGHTEMPERATURES (ABOVE500C), HYDROGEN IN THE HERMETICALLY-SEALED BATTERY CONTAINERCANBUIlDUPTO LARGE PRESSURE, CAUSING DAMAGE TO THE BATTERIES AND/OR INSTRUMENT. (

41、REFERTOSECTIONIV,PAGE4-3.) 3-9.INSTRUMENTTEMPERATURELIMITS. 3-10.Thisinstrumenthascertaintemperaturelimi- tations.Thedesignofthisinstrumenthasprovided forsafeandstableoperationovertherangeof -20to +50oC(-4to+1310F).Thistemperaturerangeis quiteadequateformostusers;however,keepthese limitsin mind when

42、operatingunderfield conditions. Internaltemperaturesinexcessof 1220Farequite easytoobtainiftheinstrumentisleftinthesun,even iftheairtemperatureisquitemoderate.A good practiceistobecertainthattheinstrumentisnot storedoroperatedindirectsunlighttoavoidthepos- sibilityofreducedperformance.Whenusing403B

43、attemperaturesbelowOOC,becertainthebatteries arefullychargedpriortosubjectinginstrumentto thistemperature. 3-11.INPUTPROTECTION. 3-12.A1/16Afuseisincludedinserieswiththe input Circuit whichwillopen withrepeatedorexces- siveoverload.Thisfuseisaccessiblewhenthecabi- netisremoved.Asparefuseisincludedin

44、sidethe instrument. 3-13.VOLTAGEMEASUREMENTS. 3-14.Alwaysleavetheinstrumentonthe1-voltrange orhigherwhenmakinginitialconnectionstocircuits which have dclevelsover25volts.Thenswitchto theappropriatelowerrangetoobtainanup-scale reading.Thispracticeshouldbeusedwhenmaking powersupplyripplemeasurementswh

45、erethedcvolt- agemaybeasmuchas600volts,buttheacrippleis only a fewmillivolts.To obtainspecifiedaccuracy, the groundstrapshouldbeconnectedexceptwhen thesignalgroundisdcoffsetfromchassisground. 3-15.Ifmeasurementsaremadefromahigh-imped- ancesource,humpick-upcanaffectthemeterindi- cationbecauseof highi

46、mpedanceof boththesource andvoltmeter.Shieldedleadswillreducepick-up althoughtheywillcauseanincreaseinthecapacity shuntedacrossthesource,withthepossibilityof excessivecircuitloading. 3-16.Therated2megohmsinputresistancewill be effectivelyreduced(above 1kHz)by shunt inputcapa- city.(Thisfactistruefor

47、anyacvoltmeter.)50pF hasareactanceof0.8megohmat4kHz, 80,000ohms at40kHz,etc.Theshuntcapacitydecreasesonthe higherranges(seeTable1-1).Thisfactorshouldbe consideredwhenmeasuringhigherfrequencyvoltages incircuitsofmoderateimpedancelevel. 3-17.severeRFcirculatingcurrentsaregenerated atpotentialsapproach

48、ing300voltsinthe1to2MHz frequencyrange.Theseseveregroundcurrentslimit theaccuracyofthe403Bto10% onthe300-voltrange. Byusing-hp-accessories1000lA (10:1 divider) and a 10111A(adapter)shuntedby a2-megohmresistor, theaccuracyofthe403Bcanberetainedto5%. 3-18.WAVEFORMERRORS. 3-19.Inordertomaintainaccuracy

49、ofmeasure- ment, onemustrememberthatthisinstrumentisan averagerespondingdevice,butthemeterscaleis calibratedintermsofthermsvalue of apuresine wave.Ifthewaveformofthevoltage beingmeasured containsappreciableharmonicsorotherspurious voltages,themeterindicationwilldeviatefromthe truermsvalue ontheorderindicated byTable3-1. 3-1 sectionm Mode1403B .Ulllilt CD CD FUNCTION:Three-positionswitchchecks batterychargewhentheswitchisintheON position; itapplies27. 5voltsfromtheNi