HP-3465A-Manual-SNprefix-1546 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 MULTIMETER 3465A HEWLETTPACKARD RadioFans.CN 收音机爱 好者资料库 I Revised: Octob

2、er 1975 OPERATINGANDSERVICEMANUAL MODEL 3465A MULTIMETER Serial Numbers: 1546A01501 and greater IMPORTANTNOTICE Thislooseleafmanualdoesnotnormallyrequireachangesheet.Allmajor changeinformationhasbeenintegratedintothemanualbypage revision. Incaseswhereonlyminorchanges arerequired,achangesheetmaybe su

3、pplied. IftheSerialNumberofyourinstrumentislowerthantheoneonthistitle page,themanualcontainsrevisionsthatdonotapplytoyourinstrument. Backdatinginformationgiveninthemanualadaptsittoearlier instruments. Wherepractical,backdatingjnformationisin,tegratedintothetext,parts listandschematicdiagrams.Backdat

4、ing changesaredenotedbyadelta sign.Anopendelta()orlettereddelta(A)ona given page, referstothe correspondingbackdatingnoteonthatpage.Backdatingchangesnot integratedintothemanualaredenotedbyanumbereddelta(1)which referstothecorrespondingchange intheBackdatingsection(Section VIII). JjThissymbolisaninte

5、rnationalsymbolmeaningrefertothe OperatingandServiceManual.Thesymbolflagsimportant operatinginstructionsinFigure 3-1 and Paragraphs3-13, 3-16,3-21and3- 27. WARNINGI Topreventpotentialfireorshockhazard,donotexpose equipmenttorainormoisture. -hp- Part No. 03465-9,0004 (complete Manual including binder

6、) -hp- Part No. 03465-90001 (Includes Binder, Cover Inserts - no Pages) -hp-Part No. 03465-90003 (Loose-LeafPagesOnly) Microfiche Part No. 03465-90051 Copyright Hewlett-Packard Company 1975 P.O. Box 301, Loveland, Colorado 80537 U.S.A. Printed: June 1975 RadioFans.CN 收音机爱 好者资料库 HEWLETTi:jPACKARD CER

7、TIFICATION Helwett-PackardCompanycertifiesthatthisinstrumentmetitspublished specifications atthetimeofshipmentfromthefactory. Hewlett-Packard Companyfurthercertifiesthatits calibrationmeasurementsare traceable to the United States National BureauofStandards,totheextentallowedbythe Bureauscalibration

8、facility,andtothecalibrationfacilitiesofother International Standards Organization members. WARRANTYANDASSISTANCE ThisHewlett-Packardproductiswarrantedagainstdefectsinmaterialsand workmanshipforaperiodofoneyearfromthedateofshipment,exceptthat inthecaseofcertaincomponents,ifany,listed inSectionIofthi

9、soperating manual,thewarrantyshallbeforthespecifiedperiod.Hewlett-Packardwill, at itsoption,repairorreplaceproductswhichprovetobedefectiveduringthe warrantyperiodprovidedtheyarereturnedtoHewlett-Packard,andprovided theproperpreventivemaintenanceproceduresas listed in thismanualare followed. Repairs

10、necessitatedbymisuseoftheproductarenotcoveredbythis warranty.NOOTHERWARRANTIESAREEXPRESSEDORIMPLIED, INCLUDINGBUTNOTLIMITEDTOTHEIMPLIEDWARRANTIESOF MERCHANTABILITYANDFITNESSFORAPARTICULARPURPOSE. HEWLETT-PACKARD IS NOTLIABLEFORCONSEQUENTIALDAMAGES. Ifthisproductis sold aspartofaHewlett-Packardintegr

11、atedinstrument system,theabovewarrantyshallnotbeapplicable, and thisproductshallbe coveredonlybythesystemwarranty. Servicecontractsorcustomerassistanceagreementsareavailablefor Hewlett-Packardproducts. Foranyassistance,contactyournearestHewlett-PackardSalesandService Office. Addresses are providedat

12、thebackofthismanual. Model3465A TABLEOFCONTENTS TableofContents 4-64. 4-69. 4-72. 4-78. 4-80. 4-82. SectionPage I.GENERAL INFORMATIO1-1 1-1.Introduction.1-1 1-3.Description1-1 1-5.Specifications.1-1 1-7.Instrumentand Manual Identification1-1 1-9.Options1-1 1-11.Option 001 . . . . . . . . . . . . . .

13、 . . . . . .1-1 1-13.Option 002 . . . . . . . . . . . . . . . . . . . .1-1 1-15. Accessories. . . . . . . . . . . . . . . . . . . .1-1 1-17. Safety Considerations. . . . . . . . . . . . . . .1-1 SectionPage II.INSTALLATION.2-1 2-1.Introduction.2-1 2-3.Initial Inspection. . . . . . . . . . . . . . .

14、. . .2-1 2-5.Power Requirements . . . . . . . . . . . . . . .2-1 2-7.Grounding Requirements2-1 2-10. Environmental Requirements2-1 2-12. Repackaging for Shipment2-1 2-16. Power Cords and Receptacles2-2 SectionPage III.OPERATING I STRUCTIOS3-1 3-1.Introduction3-1 3-3.Frontand Rear Panel Features3-1 3

15、-5.Turn-on and Warm-up3-1 3-7.Internal Battery Voltage Measurement and Recharging. . . . . . . . . . . . . . . . . . . .3-1 3-9.Low Battery VoltageDetection. . . . . .3-1 3-11.Overload Indication3-1 3-13.ACVoltage Measurements3-1 3-14.ACVoltage Ranges3-1 3-16.DCVoltage Measurements3-3 3-17.10mVRange

16、 Zero Adjust3-3 3-19.DCVoltage Ranges3-3 3-21. Current Measurements3-3 3-23.ACCurrent Ranges3-3 3-25.DCCurrent Ranges3-3 3-27. Ohms Measurements3-4 3-28.Ohmmeter Ranges3-4 3-30.Ohmmeter Reference Current3-4 SectionPage 4-35.Display4-4 4-37.Power Supply4-5 4-39. Detailed Theory . . . . . . . . . . .

17、. . . . . . . 4-5 4-41.Precision Resistor Pack(R75)4-5 4-43.Ohms Converter4-5 4-50.AC-to-DCConverter4-6 4-56.A-DConversion Using a Monopolar Reference . . . . . . . . . . . . . . . . . . . . 4-6 Data Accumulator. . . . . . . . . . . . . . . . 4-8 Display4-8 Power Supply04-10 +10 V Series Voltage Reg

18、ulation.4-11/4-12 -12V Supply4-11/4-12 Battery Low-Voltage Detection4-11/4-12 SectionPage V.MAINTENANCE5-1 5-1.Introduction5-1 5-3.TestEquipmentRequired5-1 5-5.Performance Tests5-1 5-6.DCVoltmeter Accuracy Test5-1 5-8.DCAmmeter Accuracy Test5-1 5-10.Ohms Accuracy Test5-2 5-12.ACVoltage Accuracy Test

19、5-2 5-14.ACAmmeter Accuracy Test5-2 5-16.ACNormal-Mode Rejection Test5-5 5-18.ACEffective Common-Mode Rejection Test5-5 5-20.DCVoltmeterInputResistance Test.5-5 5-22.ACVoltmeterInputImpedance Test5-6 5-24. Adjustment Procedures5-7 5-26.Power Supply Adjustment5-8 5-30.InputAmplifier Adjustments5-8 5-

20、33.Ohms Converter Adjustments (R58and R69)5-9 5-35.AC-DCConverter Adjustments5-9 Page 4-1 4-1 4-1 4-2 4-2 4-3 4-4 Section IV.THEORYOFOPERATION. 4-1.Introduction. 4-3.Description . . . . . . . . . . . 4-6.Simplified Theory. 4-8.Signal Conditioning. 4-18.Analog-toDigital(A-D)Converter. 4-26. Logic Sec

21、tion. PERFORMANCE TEST CARDS Section VI.REPLACEABLE PARTS. 6-1.Introduction. 6-4.Ordering Information. 6-6.Non-Listed Parts. 6-8.Parts Changes. 6-10. Proprietary Parts. Page 6-1- 6-1 6-1 6-1 6-1 6-1 iii TableofContents TABLEOFCONTENTS(contd) Model3465A SectionPage VII.TROUBLESHOOTIG AND CIRCUIT DIAG

22、RAMS7-1 7-1.Introduction7-1 7-3.Schematic Diagrams7-1 7-5.Preliminary Troubleshooting7-1 7-7.Analog Troubleshooting7-1 7-10. Digital Troubleshooting7-1 7-13.Polarity, Zero Detect and Clock Circuit Verification7-2 7-15.Analog Switch Lines and Control State Counter Verification7-2 SectionPage 7-17.Dat

23、a AccumulatorInput/Output Verification7-2 7-19.DisplayandDisplay Driver Verification7-3 SectionPage VIII.BACKDATING8-1 8-1.Introduction8-1 8-3.Change Sequence8-1 8-5.PartsnotIncluded in Backdating8-1 Appendix A.Electronic Sales and Service Offices LISTOFTABLES TablePage 1-1.Specifications1-2 1-2.Gen

24、eralInformation1-3 3-1.OhmmeterCurrentThroughUnknown3-4 4-1.Display InterfaceConnections. . . . . . . . . . . . 4-9 5-1.TestEquipmentRequired5-0 5-2.DCVoltmeterAccuracyTest.5-1 5-3.DCAmmeterAccuracy Test5-2 5-4.Ohms Accuracy Test5-2 5-5.ACVoltage Accuracy Test5-3 TablePage 5-6.ACAmmeterAccuracy Test

25、, 100/lAthru lOrnARanges5-4 5-7.ACAmmeterAccuracy Test, 100 rnA and 1000rnA Ranges5-5 5-8.Power SupplyJumpers5-8 6-1.Standard Abbreviations6-1 6-2.Code ListofManufacturers6-2 6-3.Replaceable Parts List . . . . . . . . . . . . . . . . . . 6-3 8-1.Manual Backdating Changes. . . . . . . . . . . . . . .

26、8-1 LISTOFILLUSTRATIONS FigurePage 2-1.Power Receptacles2-2 3-1.Frontand Rear Panel Features3-2 4-1.Basic Block Diagram and Measurement Sequence4-1 4-2.Simplified Diagram, Ohms Converter.4-2 4-3.Block Diagram,AC-to-DCConverter4-3 4-4.Block Diagram, Power Supply4-5 4-5.Over-VoltageProtectionCircuit4-

27、5 4-6.Basic Diagram,ACConverter Amplifier4-6 4-7.FunctionalDiagram,A-DConverter.4-7 4-8.DataAccumulator.4-9 4-9.Basic Diagram,DC-to-DCConverter.4-10 4-10. Simplified Diagram,DC-to-DCConverter.4-10 5-1.DCAmmeterAccuracy Test5-1 iv FigurePage 5-2.Ohms Accuracy Test5-2 5-3.ACAmmeter Accuracy Test 100/l

28、Athru 10 rnA Range5-3 5-4.ACormal-Mode Rejection Test5-5 5-5.ACEffective Common-Mode Rejection Test . . . . . . . . . . . . . . . . . . . . . 5-6 5-6.DCVoltmeterInputResistance Test5-6 5-7.ACVoltmeterInputImpedance Test.5-6 5-8.Multimeter Adjustment Location5-7 7-1.Functional Block Diagram7-5/7-6 7-

29、2.Signal Conditioning7-7/7-8 7-3.Analog-to-DigitalConverter7-9/7-10 7-4.Logic and Display7-11/7-12 7-5.Power Supply7-13/7-14 Model3465A SECTION I GENERALINFORMATION Section I 1-1.INTRODUCTION. 1-2. This section contains general information concerning the -hp- Model3465AMultimeter. Includedisan instr

30、u- mentdescription, specifications, informationaboutinstru- mentandmanual identification,optionand accessory information and safety considerations. 1-3.DESCRIPTION. 1-4. The -hp- Model3465AMultimeterisa 4-1/2 digit, five function digital multimeter. The five functions are dc volts, acvolts, dc curre

31、nt,accurrentand ohms. Measurements can be made to four significant digits with a sample rateof 2-1/2 readings per second. Throughout this manual, the 3465AMultimeter willbereferredtoasMultimeter. 1-5.SPECIFICATIONS. 1-6. Instrument specifications are listed in Table 1-1. These specificationsarethepe

32、rformancestandards or limits against which theinstrumentistested. Any change in the specifications duetomanufacturing, design or traceability tothe U.S. National BureauofStandards will be covered by revisedpagestothismanual.Additional information describing the operating characteristics arenotspecif

33、ica- tionsbutare supplemental information fortheuser. 1-7.INSTRUMENTANDMANUALIDENTIFICATION. 1-8. Hewlett-Packard uses a two-section serial number. The first section (prefiX) identifies a seriesofinstruments. The last section (suffix) identifies a particularinstrumentwithin the series.Ifaletterisinc

34、luded with the serial number, it identifies thecountrywhere theinstrumentwas manufac- tured. This manualiskeptup-to-datewith theinstrument atalltimesbyrevision.Iftheserialprefixofyour instrument differs fromtheoneontheIde pageofthis manual, refer to Section VIII for backcl.lting information thatwill

35、adaptthismanualtoyourinstrument.All correspondence with Hewlett-Packard should include the complete serial number. 1-9.OPTIONS. 1-10. Multimeter options are available to proVide alternate methodsofpowering the instrument. The standard instru- mentispowered by rechargeable NiCad batteries or can be p

36、owered from an ac sourceof86 to 127 V or 172 to 254V, 48to 66 Hz. 1-11.Option001. 1-12. Option 001 allowsacline operation only. Poweris derived from anacsourceof86to 127 V or 172 to254V, 48to 66 Hz. Two NiCad Battery Packs can be installed at any time to allow portable operationofthe Multimeter. 1-1

37、3.Option002. 1-14. Option 002ispowered by fourDtype dry cell batteries (U2 in Europe). Alternate power can be derived frommostHewlett-Packard hand-held calculatorbattery chargers suchasthe Model82002ABattery Charger/AC Adapterthrougha special rear panelinputconnector. 1-15.ACCESSORIES. 1-16. The fol

38、lowing accessories are available toextendthe usefullnessofyour Multimeter: 1.Model11096ARFProbe,100 kHz to 500 MHz (down3dBat 10 kHz and700MHz), for use on the 10 V and 100 V ranges in the DCV function only. 2. Model 11002A Test leads, dual banana to dual alliga- tor. 3. Model 11003A test leads, dua

39、l banana to probe and alligator. 4. Submodule front handle, -hp-Parto.5061-2001. 5. Handle Kit (Rack), -hp- Part0.5061-0088. 6. Rack adapterkit(includes 1/2 module filler), -hp- PartNo. 5061-0054. 7.Nickel Cadmium Battery Pack (2 reqUired) -hp- Part No. 00035-60024. 8. Model82002ABattery Charger/AC

40、Adapter, alter- nate power(batteryelimination) for the Option 002 Multimeter. 9. 11129A Binding Post Kit. 1-17.SAFETYCONSIDERATIONS. 1-18. This operating and service manual contains cautions and warnings alerting the usertohazardous operating and maintenance conditions. This information is flaggedby

41、a caution or warning headingand/orthe symbol6.The 500V ac rms; 800V peak ac 350V(dc+peakac) (V,.Q)andCOMterminalsand 100.Q 1K.Q 10K.Q 100K.Q 1000K.Q 10M.Q PowerRequirements: 1mA 1mA 10J.LA 10J.LA 1J.LA 0.1J.LA 500V(dc+peakac) ACAandDCAVoltageBurden(nominalatfull-scale): 1000m range:250mV Allotherran

42、ges:125mV ReadingRate:2.5samples per second OverloadIndication:DisplayBlanksexceptforoverrange1 anddecimalpoint(alsopolaritysign onDCVorDCAFUNC- TIONS). OhmsTerminalCharacteristics: Configuration:2wire Open-circuitvoltage:FULL-SCALE INPUT -A / / / / /, 7/ / /ZERO-DETECT 1 mV) is present when the unk

43、nown resistance, Rx,isremoved and an open loopis presentonthe ohms amplifier. To maintain theAlsignal at 1 mV when an open loopispresent, an overload feedback circuitisused. Reference Supply Voltage+VoffsetOhms=Rx Output-IOn 4-7. A simplified theoryofoperationofthe Multimeteris presentedinthefollowi

44、ngparagraphs. The simplified theory describes each sectionofthe functional block diagram, Figure 7-1. These sections are the signal condi- tioning section,analog-to-digitalsection, logic section and the display section. Also presentedisa simplified descrip- tionofthe power supply. Refer to Figure 7-

45、1, Functional Block Diagram, and Figure 4-1, Basic Block Diagram and Measurement Sequence, for this discussion. 4-8.SignalConditioning. 4-11. OhmsConverter.The ohms converterisa high gain integrating amplifier. A simplified diagramofthe ohms converterispresented in Figure 4-2. The blocksofthe ohms c

46、onverter are the integrating amplifier, protection diodes, over-voltage protection circuit and the overload loop.Anintegrating amplifierisused because this type of amplifierisless susceptible to oscillations. The protection diodes clamp theHIterminal to a voltageofabout+1.2 V in the positive directi

47、onor -.7V in the negative direction. 4-6.SIMPLIFIEDTHEORY. 4-9. Signalconditioning consistsofattenuating and/or converting theinputsignal to a de voltage within the working limitsoftheinputamplifier. For full-scale inputs, this voltage can vary from10mVde to 1 V de depending on the function and rang

48、e. 4-10. The signal conditioning section consistsofcurrent shunts,aninputattenuator,ohmsconverterand an ac-to-dcconverter. Theoutputfrom the signal condi- tioning sectionisapplied to the input amplifier during the run-upintervalofthe measurement sequence. The Input Amplifier Gain Table locatedonFigu

49、re 7-3 indicates the full-scale input level appliedtothe input amplifier for each function and range. This signalistheoutputofthesignal conditioning section. COMr-., TO INPUT AMP OVER- VOLTAGE PROTECTION CIRCUIT C29 .-lr-AUTO-ZERO OUTPUT tNIS PROPORTIONAL TORx rlOHMS OUTPUT .0.0-. *+IVFOR 10MRANGE Rx +IOV*:.-VI0Vn.,.-.-.-_i OVERLOAD PROTECTION 3465-B-4167 Figure 4-2. Simplified Diagram, Ohms Converter. 4-2 ) ) Model34