HP-851B-Manual-SNP-526 电路图.pdf

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1、CD D a. r 8518 SPECTRUMANALYZER DISPLAYSECTION .OPERATINGANDSERVICEMANUAL , HEWLETT,PACKARD r . CD RadioFans.CN 收音机爱 好者资料库 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 *

2、 RadioFans.CN 收音机爱 好者资料库 021411 OPERATINGANDSERVICEMANUAL MODEL8518 SPECTRUMANALYZER DISPLAYSECTION SERIALSPREFIXED:526- (.I.1.un.Icl.O(OM.S nOI01MilllOAD.ALOAUO.(I.IIO.IA.11.1. PriltetJUNE1965 RadioFans.CN 收音机爱 好者资料库 Model 851B TableofContents TAlLEOfCONTINTS 4-7. 4-13. 4-15. 4-16. 4-20. 4-24. 5-21

3、 5-21 5-21 5-22 5-24 5-24 5-25 5-27 5-27 5-31 5-31 5-31 5-31 5-32 5-32 5-32 5-33 6-1 6-1 6-1 Pag. 5-50. 5-51. 5-55. 5-58. Section VMAINTENANCE (Contd) 5-49.HorizontalAmplifierChecksand Adjustments. . . . . . . Calibration. . . . . . . . SweepTimeCalibration. . SWEEPTIMEVernierCheck Single SweepandSw

4、eep AmplitudeChecks. .5-23 5-61.SynchronizationandOutputChecks.5-23 5-69.CRTChecks. . . . . . . 5-23 5-75.VerticalAmplUierChecksand Adjustments. . . . . . . 5-77.VerticalCalibration. 5-82.IMCI.F.BandwidthAlignment andCheck. 5-87.100KCI.F.Bandwidth Alignment andCheck. 5_91.FinalIMC andlOOKCBandwidth

5、Adjustments. . . . . . . 5-94.10KC, 3KC,andIKCI.F.Band- width AUgnment andChecks.5-28 5-99.10KCProcedure. . .5-29 5-102.3KCandIKC BandwidthChecks5-30 5-105.Finall-IOKCBandwidth AdjustmentS_30 5-107.AUTOSELECTCheck. . .5-30 5-111.I.F.SensitivityCheck. . .5-31 5-116.VERT DISPLAYChecksand Adjustments.

6、. . 5-117.PreliminaryCheck. 5-118.weDisplay. 5-121.SQDisplay. 5-123.LINDisplayLinearityCheck. 5-124.FinalI.F.BandwidthAdjustments. 5-126.MeasurementSetup andInitial Procedure. 5-127.CrystalFilter(10KC, 3KC, lKC) Balance. . . . . . . . .5-32 5-128.IMCBandpassFilterAdjustments5-33 5-131.Troubleshootln

7、g. . . . .5-33 5-132.Localizatlon.5-33 5-134.PartsLocation5-33 5-136.IsolatingTroubleinTransistor Circuits. . . . . . . . . 5-140.In-CircuitTestingofTransistors Q3,Q4, Q5,Q6. . . . . .5-33 5-142.ReplacementofCathode-RayTube5-36 5-145.TransistorReplacement. .5-36 5-150.Removing I.F.GAIN SwitchAssyAl5

8、-39 5-152.RemovingBandpassFilterAssyA12 5-41 5-154.RemovingSwitches. . . .5-41 5-156.RemovingAssembliesA3andAS.5-41 5-158.EtchedCircuits.5-41 5-163.Transistors. . .5-43 VIREPLACEABLE PARTS 6-1.introduction. 6-5.OrderingInformation 5-14 5-19 5-19 5-19 5-20 5-21 4-1 4-1 3-1 3-1 3-1 3-1 3-1 3_I 3-6 3-6

9、 5-1 5-1 5-1 5-1 5-1 5-1 5-3 5-11 5-12 5-12 5-13 4-4 4-4 4-5 4-5 4-5 4-5 4-6 2-1 2-1 2-1 2-1 2-1 2-1 2-1 2-1 2-1 Pag. I-I I_I I_I 1-2 1-2 NPRINCIPLESOFOPERATION. 4-1.Introduction. 4-5.OperationofHorizontalSweep Generator. External. . . Internal. . OperationofVerticalDisplay Current-ControlledAttenua

10、tor. SquareMode ofOperation. LogarithmicMode ofOperation VMAINTENANCE. 5-1.Introduction 5-5.Content. 5-6.Coverand Side PanelRemoval. 5-7.PerformanceChecks. 5-9.OperationalChecks. . 5-14.VerticalDisplayAccuracyCheck. 5-20.I.F. BandwidthAccuracyCheck 5-24.I.F.InputSensitivityCheck. 5-27.I.F. GAIN SetA

11、ccuracyCheck. 5-31.Sweep RateAccuracyCheck. 5-35.851B Inspection andAdjustment TestCard. 5-37.ChecksandAdjustments. 5-39.PreliminaryAdjustmentProcedure. 5-40.LVPowerSUpplyAdjustments 5-43.HVPowerSupplyCheck. 5-46.Focus Check andAdjustment IIIOPERATION. 3-1.Introduction. 3-7.Description. 3-9.I.F.Band

12、width. 3-12.Display. 3-15.Oscilloscope. 3-20.OperatingInslructions 3-22.PhotographicTechniques UINSTALLATION. 2_1.initialInspection. 2-3.MechanicalCheck. 2-4.PerformanceCheck. 2-6.ClaimforDamage. 2-8.Connections. . 2-10.PowerRequirements 2-15.EstablishingFigure-of-MeritRating 2_18.Rack Mounting. Sec

13、tion IGENERAL INFORMATION. 1-1.Introduction. 1-3.Description. 1-5.Applications. 1-7.Cathode-RayTube 02148-1 III ListoflllustraUonsModel 851B LISTOFILLUSTIATIONS 5-41 5-42 5-52 5-52 5-50 5-53 5-54 5-54 5-56 5-67 5-61 5-62 5-63 5-64 5-65 5-66 5-28. 5-29. 5-30. 5-31. 5-32. 5-33. NumberTitlePage 5-12.Ca

14、thode-RayTube,Partsand ConnecUons InvolvedInRemoval . . 5-37 5-13.TopVIewof851DisplaySecUon.5-3ij 5_14. Bottom View of851Dlsplaysection5-39 5-15.UnderSide ofTransistor/Transformer Deck,ldentuicationofQ3-Q6 Terminals. 5-16.TransistorBiasingandTypicalOper- atingCh2racterisUcs. . . . . 5-17.CRT ShieldA

15、ssembly,Parts identification. . . . . . . 5-18.I.F.GAIN(DB) SwitchAssemblyAI, Component Identification. . 5-19.BandpassFilterAssemblyA12, Componentidentification. 5-20.20MCI.F.lnputandAttenuator SChematic, 851B. 5-21.RFCircuitAssemblyBoardsA2A2, A2A3, A2A4. 5-22.RFCircuitAssemblyA2.TopCover Removed.

16、 5-23.RFCircuitAssemblyBoardsA2A5 and A2Al. . . . . . . . . .5-54 5-24.I.F. Bandwidth SwitchingCircuits.851B5-55 5-25.VERT DISPLAY SwitchAll. .5-56 5-26.RFClrcuttAssemblyBoardsA2A6, A2A7,andRearofCasting. 5-27.VERT DISPLAY Switch.Current- ControlledAttenuator,and20MC I.F.AmpllfierSChematics,851B.5-5

17、7 VerticalAmplUierA7Board5-58 VerticalAmplifierSchematic,851B5-59 SWEEPTIMESwitch AIOSI. .5-60 SweepandHorlzonu.lAmplUierA6Board5-60 SYNC Switch S2. . . . . .5-60 SweepandHorizontalAmplUler SChematic, 851B. 5_34.MYPowerSupply A8Board. 5-35.HVPowerSupply SChematic.8518 5-36.LVPowerSupplyA9Board. . .

18、5-37.LVPowerSupply SChematic.85IB 5-38.I.F.BANDWIDTH SwitchA4S1. 5-39.851B SWEEPTIMESwitch AIOSI. SChematic. . . . . . 3- 3-3 5-21 5-22 5-24 4-6 4-5 5-25 5-26 Page 2-2. 3-1. 3-2. 3-3. 3-4. 3-5. 4-1. 5-3. 5-4. 5-5. NumberTitle 1-1.Model 851BSpectrumAnalyzer- DLsplaysection. . .1_1 2-1.Insu.llatlonCon

19、nections, Model 851/8551 SpectrumAnalyzer. .2-2 Rack MountingProcedure,851B.2-4 FrontPanelControls,Connectors,and Indicators. . . Switches andConnectors,RearPanel. InitialOperatingProcedurefor10-Mc to 10-Gc Inputs. .3-4 PhotographicProcedure.3-5 Optimum 851I.F.BANDWIDTHsettings.3-6 Model 851B/8551AS

20、pectrumAnalyzer, BlockDiagram. . .4-2 4-2.ModeJ 851BSpectrumAnalyzerDisplay sectlon, BlockDiagram. .4-3 4-3.HorizontalSweepGenerator,Block Diagram.4-4 4-4.TypicalDynamicResistance-vs-Current Curve.HotCarrierDiodes. 4-5.VERT DISPLAY SwitchatSQ, SimplifiedSChematic . 4-6.VERT DISPLAY SwitchatLOG, SImp

21、lified SChematic .4-7 5-1.MeasurementSetup,CheekandAdjustment ofLVPowerSupply. . . .5-20 5-2.CRTBaseasSeenfromRear,CRTPro- teetiveCoverRemoved . . MeasurementSetup, SweepCalibration Pin-cushioningandBarrellfngDefined MeasurementSetup,CaUbrationof 851 VerticalAmplUler. 5-6.Setupfor851 Video Bandwidth

22、 Measurements. . 5-7.MeasurementSetup, IMCandlOOKC I.F.BandwIdth Alignment andChecks.5-27 5-8.MeasurementSetup, 10KCI.F.Bandwldth Alignment andChecks. .5-28 5-9.MeasurementSetup,FinalI.F.Bandwidth Adjustments. . . 5-32 5-10.851BSpectrumAnalyzerDisplaySection, TopView,TopCoverRemoved .5-34 5-11.851BS

23、pectrumAnalyzerDisplaySection, Bottom View, BottomCoverRemoved5-35 kJo_lv 02148-1 Model8518ListofTables LIST0TAlLIS 5-40 5-43 5-36 5-36 5-58 5-45 5-44 5-58 5-46 5-51 5-66 6-2 6-14 6-20 PageNumberTitle 5-23.TypicalDataforOut-of-Circuit TransistorResistanceMeasurement 5-23A.safeOhmmeterRangesforTransi

24、stor ResistanceMeasurements. 5-23B.ConnectionPoint,Q3, Q4,Q5,Q6 Base-EmitterForwardBiasCheck.5-36 5-23C.Recommendations,Component Removal5-40 5-23D.AdjustmentsRequiredafterComponent Replacement. 5-23E.EtchedCircuitSolderingEquipment. 5-24.Connections,RFCircuitAssemblyA2, BoardsA2AlthroughA2A5. 5-24A

25、.Connections,RFCircuitAssemblyA2, BoardsA2A6,A2A7. 5-25.WaveformChartModel 851Spectrum AnalyzerDisplaysection 5-25A.SymbolsUsedonSchematicDiagrams 5-26.Connections,SweepandHorizontal AmpliflerAssemblyA6, 851B . 5-27.Connections,VerticalAmplUter AssemblyA7. 5-28.Connections,SWEEPTIMESwitch AIOSI, 851

26、B .5-62 Connections,HVPowerSupply A8Board5-62 Connections,SYNC Switch S2,851B.5-64 Connections,LVPowerSupplyA9Board5-64 Connections,I.F.BANDWIDTH Switch A4S1 ReferenceDesignationIndex,General ReferenceDesignationIndex,AssyA2 ReplaceableParts 5-29. 5-30. 5-31. 5-32. 6-1. 6-2. 6-3. 5-11 5-0 5-2 5-2 5-

27、3 5-4 5-5 5-6 5-11 Page 1-0 1-2 1-2 1-2 TestEquipmentRequired TestAccessoriesRequired AssembliesvsSChematics,8518. Controls,Switches,andConnectorsvs SChematics ChassisPartsLocater OperationalChecks. PerformanceCheckTestCard,851B. VERT DISPLAYAccuracyCheck. I.F.BandwldthAccuracyChecks(IMC, lOOKC,10KC

28、). r.F.BandwidthAccuracyChecks,3KC and IKC .5-12 I.F.InputsensitivityCheck5-12 Sweep RateAccuracyCheck.5-14 851BCheckandAdjustmentTestCard5-14 LVPowerSupplyMeasurementData5-20 ResistancestoGround, LVPowerSupply, ReferenceData.5-20 HVPowerSupplyVoltages.5-21 SweepTimeCaUbration.5-22 DataforVideo Band

29、widthCheck5-25 SwitchSettingsforAUTOSELECTCheck5-30 DataforI.F.SensitivityCheck.5-31 SQDisplayLinearityCheckData.5-31 LINDisplayLinearityCheckData5-32 NumberTitle 1-1.Speciflcations 1-2.AccessoriesSupplied . 1-3.AccessoriesAvaUable. 1-4.Options. 5-5. 5-6. 5-7. 5-8. 5-9. 5-10. 5-1. 5-2. 5-3. 5-4. 5-1

30、1. 5-12. 5-13. 5_14. 5-15. 5-16. 5-17 5-18. 5-19. 5-20. 5-21. 5-22. 02148-1 v Model85lB I-l6tC-rl_-.- -,:.:rr ISf TOP161.71 (!d-.-1 T $IOE GENERAL OutputSignals:Verticalandhorizontalsignalsap- pliedtoCRTareavailableforexternalmonitoring. Vertical:0to-4volts;outputimpedance,4700n Horizontal:10voltspe

31、ak-to-peak,0.3voltopen circuit;sweepapproximatelysymmetricalabout zero;outputimpedance,4700n Cathode-RayTube:7.5-kvpost-acceleratortube withP2medium-persistencephosphorandinternal graticule.Lightbluefiltersupplied.Other phosphorsoptional. Dimensions: . InternalGraticule:Parallax-free7 x 10cm,marked

32、incmsquareswith2-mmsubdivisionsonmajor verticalandhorizontalaxes. 02148-1 NOTE OtMUlJIONIININIANtIt.LU.,U(IIIISI I.ItAClt.IStolT lINCLUliltNGlUll,Tltl ,OftCAINTHCIGMTllNCLUOIGrun00 1(IITOIIUCI(HE, IUAJtItONIt(CUS RFI: Conductedandradiatedleakagelimitsarebe- lowthosespecifiedinMIL-I-6181Dand MIL-I-16

33、910. Power:115or230volts10%, 50to1000cps, approximately25watts Weight:Net34 lb (15 kg);shipping45lb(20,3kg) AccessoriesFurnished:7-1/2foot (2290 mm)power cable;rackmountingkit;joining-bracketkitfor bonding Model 851toModel 8551 Options: 07.P7phosphorinlieuofP2(amberfilter supplied),noadditionalcharg

34、e. 31.P31phosphorinlieuofP2(greenfilter supplied),noadditionalcharge. Table1-1.Specifications,851BDisplaySection MaximumCWInput Signal:-14dbm VerticalDisplay: Linear,square(power),orlogarithmic DynamicRange:Linear,70:1;square,70:1; log,60db Accuracy:Linear,3%offullscale;square,5% offullscale*;log,2d

35、b*. I.F.Input: CenterFrequency:20 Mc InputImpedance:50ohms,nominal InputRequiredfor6-cmVerticalDisplay: 1-Mcbandwidth,-62to -53 dbm 100-Kcbandwidth,-75to-60dbm 10-Kcbandwidth,-95to-80dbm 3-Kcbandwidth, -95 to-80dbm 1-Kc bandwidth, -86 to -71 dbm I.F.Bandwidth: Manual:Bandwidthsof 1, 3, 10, 100 Kc,an

36、d1 Mc canbeselected. AutoSelect:One of theabovebandwidthsautomatic- allyselectedforbestresolutionof aCWsignal witheachcombinationofspectrumwidthand sweeprate. BandwidthAccuracy:Individualbandwidthsare calibratedwithin20%; bandwidthrepeatability andstabilitytypicallybetterthan3%. I.F.GAIN Set:Two-sec

37、tionattenuatorprovides0to 80 dbattenuationin1-dbsteps.Onesectionpro- vides0to70 dbattenuationin10-dbsteps;the other,0 to 10 db in1-dbsteps.Vernierprovides continuousadjustmentbetweenI-dbsteps. SweepRate:Sixcalibratedratesfrom3msec/cm to1sec/cmin a1,3, 10sequence.Vernierpro- videscontinuousadjustment

38、betweencalibrated ratesandextendsslowestratetoatleast3sec/cm. I.F.GAINSetAccuracy:70-dbsection,0.5db; 10-dbsection,0.1db DISPLAY CHARACTERISTICS SweepSynchronization: Internal:Sweepfreeruns Line:Sweepsynchronizedwithpower-line frequency External:Sweepsynchronizedwithexternally appliedsignal+3to+15vo

39、ltspeak Single Sweep: Sweepactuatedbypanelpushbutton SweepRateAccuracy:3% SectionI Table1-1 *Exceptpulsespectrumson1-McI.F.bandwidth 1-0 Model 851B SECTIONI GENERALINFORMATION Section I Paragraphs1-1to1-4 1-1.INTRODUCTION. 1-2.TheModel 851BistheDisplaySection ofthe Hewlett-PackardSpectrumAnalyzer;th

40、eRFSection istheModel 8551.Together,the851/8551provide anAnalyzerwhichcandisplayupto2 Gc ofspectrum. Analyzerinputrangeisfrom10 Mcto42 Gc,its dynamicrangeis60db,itssensitivityisatleast-65 dbm,itsimageseparationis4 Gc,anditsfunctions arecalibrated.TheRFSection, whichisareceiver thatelectronicallyscan

41、sthe inputsignal,isdescribed in aseparateOperatingandServiceManual. 1-3.DESCRIPTION. 1-4.The851BDisplaySectionisanoscilloscope withanunusuallywidedynamicrange.Thedisplay isamplitudevsfrequency,andrangeissuchthata fundamentalandharmonicsdownasfaras60dbcan beviewedsimultaneously.Inadditiontothefeature

42、s offeredbyothergoodoscilloscopes-featuressuch ascalibratedsweeptimes,calibratedgain,choiceof synchronizingvoltages,verticalandhorizontalposi- tioning, focusadjustments,andintensityvariation- the 851Bprovidesadditionalfacilitieswhich widen thescopeof theAnalyzerasanelectronictool. a.Choice ofAmplitu

43、deCalibrations.The851B displaycanbemade1)proportionaltovoltage(linear), proportionaltopower(square),or3)proportionalto thelog oftheinputvoltage.Useoflogarithmiccali- brationiswhatmakesitpossibletoviewamplitude variationsasgreatas60db inthesamedisplay. b.Choice ofCalibratedI.F.Bandwidths.The 851Bprov

44、idesfivecalibratedI.F.bandwidths: 1 Mc, 100 Kc, 10 Kc, 3 Kc, and 1 Kc.Thenarrowerband- widthsprovidegreaterresolutionandthewiderband- widths viewing of abroaderband offrequencies. c.AutomaticSelectionof OptimumI.F.Bandwidth. Characteristicsofthedisplayarea function ofthe width offrequencybandswept(d

45、eterminedby theset- tingoftheSPECTRUM WIDTHswitchinthe8551RF Section),theI.F.bandwidth, andthesweepspeed. Forautomaticselectionof optimum bandwidthfor selectedsweepspeedsand widthofbandswept,the 851BprovidesanAUTOSELECTpositionon theI.F. BANDWIDTHswitch. d.FacilitiesforMakingSuperiorOscillograms. Th

46、e851B CRThasaninternalgraticule,thuspro- vidingaparallax-freepresentation.Inaddition, when theinternalgraticuleisilluminatedbyultra-violet light,resultingphotographsareofunusuallyfine quality.(The hp 196BOscilloscopeCameraincludes asourceofultra-violetlght.)Anotherfeatureof theDisplaySectionisbase-l

47、ineblankingcapability. Thisfeatureisusefulboth when viewinglow-level signalsorwhenmakinganoscillogramsincefeatures ofinterestareclearerwhenbaseline glowisblanked. Forphotographicconvenience,theCRTincludesa bezelformounting acamera,and a SINGLE SWEEP lampwhichindicatescompletionofthesweep. 02148-1 Fi

48、gure1-1.Model 851BSpectrumAnalyzer-DisplaySection 1-1 section1 Paragraphs1-5to1-8 15.AL1CATIONS. 1-6.Someofthe many appUcationsofthe Hewlett- PackardSpectrumAnalyzerarediscussedin Appli- cationNotes63and 63A.One oftheseapplicationsis analyzingshortRFp.1lses.Becauseoffeaturescon- tributedby the8518-a choice ofI.F.bandwidths, dynamicrangeofatleast60 db,andcalibratedsweep speeds,theAnalyzerisa valuable tool inpulsework. ShortRFpulses(ten.ofnanoseconds) havepreviously beendUflcult toanalyzein thefrequencydomainbe- causeoflimitationsindynamicrangeandtheJ.F. bandwidth ofavailableanalyzers.T