HP-1805A-Manual 电路图.pdf

HP Archive This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web ! On-line curator: Gertjan Rhebergen RadioFans.CN 收音机爱 好者资料库 OPERATINGANDSERVICEMANUD,1. DUALCHANNEL VERTICALAMPLIFIER 1805A HEWLETTIIPACKAJ) RadioFans.CN 收音机爱 好者资料库 CERTIFICATION TheHewlett-Packard Company certifies that this instrumentwas thoroughly tested and inspected and foundtomeet its published specifications when itwasshipped from the factory-TheHewlett- Packard Company further certifies that its calibration measure- ments are traceabletotheU.S.National Bureau of Standardsto the extent allowedbythe Bureaus calibration facility. WARRANTYANDASSISTANCE ThisHewlett-Packardproductiswarrantedagainstdefects inmaterialsandworkmanship.Thiswarrantyappliesfor oneyearfromthedateofdelivery,or,inthecaseofcertain majorcomponentslistedintheoperatingmanual,forthe specifiedperiod.Wewillrepairorreplaceproductswhich provetobedefectiveduringthewarrantyperiodprovided theyarereturnedtoHewlett-Packard.Nootherwarranty isexpressedorimplied.Wearenotliableforconsequential damages. Servicecontractsorcustomerassistanceagreementsare availableforHewlett-Packardproductsthatrequiremain- tenanceandrepairon-site. CWcitation.ispreselll. DONOTSUBSTITUTEPARTS ORMODIFYINSTRUMENT. BecauseofthedangerofintroducinRadditionalhazards,donotinstallsubstitutepartsorperformanyun- authorizedmodificationtotheinstrument.ReturntheinstrumenttoaHewlett-PackardSalesandSeruice OfficI for serulceandrepair toensurethatsafetyfeaturesaremaintained. DANGEROUSPROCEDUREWARNINGS. Illl/1illg.suchliStheexall/plehelou.pre(,ldcpotentiallydanRerousproccduresthrouphoutthis IIwllua!.Instructiollsmlltailldinthcuarnlllf,fsmusthI followed. WARNINGI /)allperous(o!taf,fes.capah/cofcausinRdcath,arcprcselltIIIthisillstrull/cnt. lse ex/rl1/e cautioll chcll handlillf,f, tpstinR,andadjustinR. 558/74 Model 1805A TABLE OFCONTENTS TableofContents SectionPageSection Page I II III GENERALINFORMATION. 1-1.Introduction. 1-5.Specifications. 1-7.AccessoriesSupplied. 1-9.AccessoriesAvailable. 1-11.Options. 1-12.Option003. 1-13.InstrumentandManual Identification. INSTALLATION. 2-1.Introduction. 2-3.InitialInspection. 2-5.PreparationforUse. 2-8.Repackingforshipment. OPERATION. 3-1.Introduction. 3-3.InstrumentCapabilities. 3-6.GeneralOperatingInstructions. 3-7.ControlsandConnectors. 3-8.InitialTurn-onProcedure. 3-9.AmplifierCalibration. 3-10.ApplicationProcedures. 3-11.Peak-to-peakVoltage Measurements. 3-12.DC VoltageMeasurements. 3-13.Time-intervalMeasurements. 3-14.FrequencyCalculation. 3-15.ProbeCompensation. 1-1 1-1 1-1 1-1 1-1 1-1 1-1 1-1 2-1 2-1 2-1 2-1 2-1 3-1 3-1 3-1 3-1 3-1 3-1 3-1 3-1 3-1 3-1 3-3 3-3 3-3 V VI PERFORMANCECHECKAND ADJUSTMENTS. 5-1.Introduction. 5-3.EquipmentRequired. 5-5.PerformanceChecks. 5-7.Adjustments. 5-9.PerformanceCheckRecord. 5-11.Front-panelControlSettings. 5-13.PerformanceCheckProcedures. 5-14.InitialPerformanceCheck. 5-15.PolarityCheck. 5-17.DeflectionFactor. 5-19.DC OffsetVoltage. 5-21.RiseTime. 5-23.BandwidthCheck. 5-25.CommonMode Rejection. 5-27.VerticalOutputAmplitude. 5-29.VerticalOutputBandwidth. 5-31.Triggering. 5-33.VSWRCheck. 5-35.Adjustments. 5-37.DCBalanceAdjustment. 5-38.SyncBalanceAdjustment. 5-39.SyncLevelAdjustment. 5-40.VertOutLevelAdjustment. 5-41.Volts/DivCalAdjustment. 5-42.AttenuatorAdjustments. 5-43.PulseResponseAdjustments. REPLACEABLEPARTS. 6-1.Introduction. 6-3.OrderingInformation. 5-1 5-1 5-1 5-1 5-1 5-1 5-1 5-2 5-2 5-2 5-2 5-3 5-3 5-4 5-4 5-5 5-5 5-6 5-6 5-7 5-7 5-7 5-7 5-7 5-9 5-9 5-10 6-1 6-1 6-1 VIIMANUALCHANGES. . . . . . . . . . . . . . . .7-1 IVPRINCIPLESOFOPERATION. . . . . . . .4-1 4-1. 4-3. 4-5. 4-6. 4-7. 4-8. 4-9. 4-11. 4-12. 4-13. 4-14. 4-19. 4-21. 4-23. 4-28. 4-35. 4-36. 4-37. 4-38. Introduction. . . . . . . . . . . . . . . . .4-1 BlockDiagram. . . . . . . . . . . . . .4-1 Attenuator. . . . . . . . . . . . . . . .4-1 ImpedanceConverter.4-1 Preamplifier. . . . . . . . . . . . . . .4-1 ChannelAControl.4-1 SyncAmplifier.4-1 DelayLine. . . . . . . . . . . . . . . .4-1 MainAmplifier. . .4-1 OutputAmplifier. . . . . . . . . . . . .4-1 ControlCircuit. . . . . . . . . . . . . .4-1 PowerSupply. . . . . . . . . . . . . . .4-2 DetailedCircuitry. . . . . . . . . . . . .4-2 AttenuatorsAlOandAll4-2 Preamplifier. . . . . . . . . . . . . . .4-2 DelayLine. . . . . . . . . . . . . . . .4-2 MainAmplifier . . . . . . . . . . . . . .4-2 OutputAmplifier. . . . . . . . . . . . .4-3 SyncAmplifier. . . . . . . . . . . . . . .4-3 7-1.Introduction. 7-3.ManualChanges. 7-5.ManualChangeInstructions. VIIISCHEMATICSANDTROUBLE- SHOOTING. 8-1.Introduction. 8-3.Schematics. 8-8.RepairandReplacement. 8-10.OutputTransistorRemoval. 8-11.AttenuatorRemoval. 8-12.AttenuatorRepair. 8-16.CircuitBoards. 8-17.BoardConnections. 8-18.CircuitBoardRemoval. 8-27.SemiconductorReplacement. 8-28.IntegratedCircuitReplace- ment. 8-29.Troubleshooting. 7-1 7-1 7-1 8-1 8-1 8-1 8-1 8-1 8-1 8-1 8-2 8-2 8-2 8-3 8-3 8-3 111 ListofIllustrations ListofTables Model 1805A LIST OF ILLUSTRATIONS FigureTitlePageFigureTitlePage 2-I.Plug-inMating.2-28-7.PreamplifierandSyncAmplifier 3-I.ControlsandConnectors.3-2Schematic2.8-10 3-2.DividerProbeAdjustmentDisplay.3-48-8InterconnectingBoardA4,Component Identification.8-12 5-1.PolarityCheckTestSetup.5-28-9.PreamplifierandSyncAmplifier 5-2.DeflectionFactorTestSetup.5-3Schematic3.8-12 5-3.RiseTimeTestSetup.5-38-10.MainAmplifierBoardA7,Component 5-4.BandwidthTestSetup.5-4Identification.8-14 5-5.CMRTestSetup.5-48-11.OutputAmplifierBoardA8,Component 5-6.VerticalOutputAmplitudeIdentification.8-14 TestSetup.5-58-12.OutputAmplifierSchematic4.8-14 5-7.VerticalOutputBandwidth8-13.TopSwitchedBoardAI,Component TestSetup.5-5Identification.8-16 5-8.VSWRTestSetup.5-68-14.TopSwitchBoardSchematic5.8-17 5-9.AdjustmentLocations.5-88-15.BottomSwitchBoardA2, ComponentIdentification.8-18 8-1.AttenuatorAssembly.8-28-16.BottomSwitchBoardSchematic6.8-19 8-2.ChassisComponentandAssembly8-17.ControlBoardA3,Component Locations.8-4Identification.8-20 8-3.TroubleshootingBlockDiagram.8-68-18.ControlBoardSchematic7. 8-20 8-4.AttenuatorComponentIdentification.8-88-19.PowerSupplyBoardA5,Component 8-5.AttenuatorSchematic1.8-9Identification. 8-22 8-6.PreamplifierandSyncAmplifierBoard8-20.PowerSupplySchematic8. 8-23 A6,ComponentIdentification.8-10 LIST OF TABLES TableTitlePageTableTitlePage I-I.Specifications.1-25-10.ChannelBPulseResponseAdjust- 5-I.RecommendedTestEquipment.5-0ments.5-10 5-2.DeflectionFactorAccuracy.5-3PerformanceCheckRecords.5-11 5-3.Triggering.5-6 5-4.VSWR.5-76-1.AbbreviationsforReplaceable 5-5.CompensationAdjustments.5-9PartsList. 6-1 5-6.AttenuatorInputAdjustments.5-106-2.ReplaceableParts. 6-2 5-7.CompensationAdjustment.5-106-3.ListofManufacturersCodes.6-9 5-8.AttenuatorInputAdjustment.5-10 5-9.ChannelAPulseResponseAdjust- ments.5-107-1.ManualChanges.71 IV Model 1805A 1-1.INTRODUCTION. GeneralInformation SECTION I GENERALINFORMATION 1-7.ACCESSORIES SUPPLIED. 1-2.TheHewlettPackardModel 1805A plug-inisa dual-channelverticalamplifierdesignedtooperate with ahorizontaltimebaseinanHP180-series oscillo- scopemainframe.Eachchannelprovidesaccurate measurementsofhigh-frequencysignalsandfastrise timepulseswith5 mV/divverticaldeflectioncapabil ityoverthefull lOOMHzbandwidth.Selectableinput impedanceofeither50ohmsor1megohmpermits impedanceselectionthatbestmeetsmeasurement applications.Itslowshuntcapacitanceofapproxi- mately13pFreducesphaseshiftandsignallossin pulseorcwmeasurements.Inaddition,thedc offset capabilityof200divisionsallows lowlevel,biased logic pulses to bepositionedon screen foraccurate measurements. 1-3.Thismanualcontainsinstallationandoperating instructions,aswellasmaintenanceinformationfor the1805A.Instrumentspecificationandprocedures forverifyingproperoperationareincluded. Proce- duresarealsoincludedforadjustingtheinstrumentto itsperformancespecifications.Schematicdiagrams, thetheoryofoperation,andtroubleshootinginfor- mationareprovided foruseinmaintainingtheinstru- ment. 1-4.Thissectionofthemanualcontainstheperform- ancespecificationsforthe1805A,andalistof availableoptions.Italsoliststheaccessoriesthatare available.Instrumentandmanualidentificationinfor- mationarealso included. 1-5.SPECIFICATIONS. 1-6.Table1-1isa completelistofthe1805Acritical specificationsthatarecontrolledbytolerances.Any changesinspecifications due tomanufacturing,design, ortraceabilitytotheU.S.NationalBureauofStandards will be listed on amanualchangesheetincludedwith thismanual.Themanualandmanualchangesheet supersedeallpreviousinformationconcerningspecifi- cationsofthe1805A. 1-8.Thefollowing accessoriesaresuppliedwiththe 1805A: Two Voltage Divider Probes,HPModel lO014A 1-9.ACCESSORIES AVAILABLE. 1-lO.Thefollowing accessoriesareavailableforthe 1805A: Model10016AVoltageDividerProbes Model lO020A Resistive DividerProbeKit Model 1120A 500 MHz ActiveProbe Model 1125AImpedanceConverterProbe 1-11.OPTIONS. 1-12.OPTION003.Thisoptionprovidesthebasic instrumentwithoutthetwoHPModel10014AVoltage Divider Probes. 1-13.INSTRUMENTAND MANUALIDEN- TIFICATION. 1-14.Instrumentidentificationbyserialnumberis locatedontherearpanel.Hewlett-Packardusesa two- sectionserialnumberconsistingofa four-digit prefix anda five-digit suffix,separatedbyaletterdesignat ingthecountryinwhichtheinstrumentwasmanufac- tured.(A=U.S.A.;G=WestGermany;J=Japan;U= UnitedKingdom.) 1-15.Thismanualappliestoinstrumentswithaserial prefixnumberasshownonthetitlepage.Ifchanges havebeenmadeintheinstrumentsincethismanual wasprinted,aManualChangessupplementsupplied withthemanualwill definethesechanges.Besureto recordthesechangesinyourmanual.Backdating informationinSectionVIIadaptsthemanualtoinstru- mentswithserialnumberslowerthanthatshownon thetitle page.Partnumbersforthemanualandthe microfiche copyofthemanualarealsoshownonthe title page. 1-1 GeneralInformationModel 1805A Table1-1.Specifications *AlldisplaymodesexceptChop,dcto100kHzIII Chop. 1820C, 1824Adc - 50MHz1/2div 1825A, 1840A,dc-100MHz1div 1841A 1820B, 1822Adc- 50MHz1/2div dc- 100MHz2div 1820A, 1821Adc - 50MHz 1div GENERAL OPERATINGENVIRONMENT Temperature:0to+55C. Humidity:to95%relativehumidityat+40C. Altitude:to4600 m (15 000ft). Vibration:vibratedinthreeplanesfor15min.each with0.254mm(0.010 in.)excursion,10to55 Hz. WEIGHT:net,2.3kg(5lb);shipping3.6kg(8lb). OFFSET 200divofoffset. Allowsoffsetofdcoracsignals uptothedynamicrangeandmaximuminput. VERTICALSIGNALOUTPUT(selectedbytrigger source switch) Bandwidth:50MHzinto50ohms. Amplitude:50mV foreachdivisionofdisplayinto 50ohmswithusableamplitudesupto500 mVPOp. Source Impedance:approx 50ohms. Required Vertical Deflection Trigger Frequency* Time Base Plug-In FREQUENCY TRIGGERING SOURCE:selectablefromchannelA,channelBora composite(Comp)signalfromAandBinany displaymode.CompositeischannelsAandB signalsswitchedforAltandChopmodesand addedfor AandB mode.Vernierandposition controlsdonotaffectA, B,orcompositetrigger signals.AandBsignalsareindependentof polarityselection. MODES OF OPERATION ChannelA;channelB;channelsAandBdisplayed alternatelyonsuccessivesweeps(ALT);channel AandBdisplayedbyswitchingbetweenchannels atapprox400kHzrate(CHOP)withblanking duringswitching;channelApluschannelB (algebraicaddition). EACHCHANNEL(2) BANDWIDTH:(measuredwithorwithout10014A probe, 3dBdownfrom8divreferencesignalfrom aterminated50-ohm source.) DC-coupled:dcto100 MHz. AC-coupled:approx10 Hzto100MHz(lowerlimitis approx1 Hzwith10014A probe). RISE TIME:<3.5ns(measuredwithorwithout10014A probes,10%to90%pointsof6divinputstepfrom aterminated50-ohm source). DEFLECTION FACTOR Ranges:5mV/divto5V/div(10calibratedposi- tions)in1,2,5 sequence.2%attenuatoraccuracy. Vernier:providescontinuousadjustmentbetween deflectionfactorsettingsandextendsmaximum deflectionfactortoatleast12.5 VIdiv.Frontpanel lightindicateswhenvernierisnotinCALposition. POLARITY:+or-up, selectable. SIGNAL DELAY:inputsignalsaredelayedsufficient- lytoviewleadingedgeofinputpulsewithout advancedtrigger. INPUTCOUPLING:AC, DC, 50ohms(dc),orground. Groundpositiondisconnectsinputconnectorand groundsamplifierinput. INPUTRC ACandDC:1megohm1%shuntedbyapprox 13pF.Constantonallranges. 50 ohm:50ohms2%.VSWR<1.2:1at100MHzon allranges. MAXIMUMINPUT AC and DC:300 V (dc +peakac)at1kHzorless. 150 V (dc +peakac)on5mV/divrangeat1kHz orless. 50ohm:10 Vrms. DYNAMIC RANGE:6divat100MHzincreasingto 16divat.15 MHz. POSITIONINGRANGE:16 div. A+BOPERATION Amplifier:bandwidthanddeflectionfactorsare unchanged;eitherchannelmaybeinvertedfor ABoperation. Differential Input(A-B)Common Mode:CMRRisat least40dBfromdcto1MHzforcommonmode signalsof16divorless.CMRRisatleast20dB at50 MHz forcommonmodesignalsof6divor less. 1-2 Model 1805A 2-1.INTRODUCTION. SECTION II INSTALLATION NOTE Installation 2-2.Thissectioncontainsinformationandinstruc- tionsnecessaryforinstallingandinterfacingthe 1805A.Includedareinitialinspectionprocedures, installationinstructions,andprocedures forrepacking theinstrumentforshipment. 2-3.INITIAL INSPECTION. 2-4.Thisinstrumentwascarefullyinspectedboth mechanicallyandelectricallybeforeshipment.It shouldbe freeofmarsorscratchesandinperfect electricalorderuponreceipt. Toconfirmthis,the instrumentshouldbeinspectedforphysicaldamage incurredintransit.Iftheinstrumentwasdamaged, file aclaimwiththecarrier.Checkforsuppliedac- cessories (listedinSectionI)andtesttheelectrical per- formanceoftheinstrumentusingtheperformance testproceduresoutlinedinSectionV.Ifthereisa deficiency, refer tothewarrantyinthefrontofthis manual. 2-5.PREPARATION FOR USE. .,WARNINGI Readthesafetysummaryatthefrontof themanualbeforeinstallingoroperating theinstrument. 2-6.The1805Aandthehorizontalplug-inmustbe lockedtogetherbeforeinstallingintoa180-series oscilloscopemainframe.Thisprocedureisexplained below.Powerforthe1805Aissuppliedbytheoscillo- scopethroughthehorizontalplug-in. ToadaptModel1805A totimebases Model 1840A (serial prefix1123Aand lower)andto Model 1841A (serial prefix 1150Aandlower),ordermodificationkit HPPartNumber01840-69503 for Model 1840AandmodificationkitHPPart Number01841-69506forModel 1841A. 2-7.Installplug-insasfol