HP-120A-AR-Manual-SNP_051 电路图.pdf

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1、 HP Archive This vintage Hewlett Packard document was preserved and distributed by www. Please visit us on the web. For free distribution only! Thanks to on-line curator: Bernhard Voss for supplying and scanning this vintage document. RadioFans.CN 收音机爱 好者资料库 OPERATINGANDSERVICINGMAN UAL MODEL120A/AR

2、 OSCILLOSCOPE SERIALSPREFIXED:051- Stock No. 120A900 CopyrightHEWLETT-PACKARD COMPANY1958 1501 PAGE Mn.LROAD,PALO ALTO, CALIFORNIA,U.S.A. 00016-2 RadioFans.CN 收音机爱 好者资料库 SWEEP 00016-2 SPECIFICATIONS Model 120A ii Sweep Range: Sweep Expand: Synchronization: TriggerPoint: VERTICAL AMPLIFIER Bandwidth:

3、 Sensitivity: InternalCalibrator: Input Impedance: BalancedInput: Common ModeRejection: PhaseShift: HORIZONTALAMPLIFIER Bandwidth: Sensitivity: Input Impedance: PhaseShift: 1 IJ-sec/cmtoatleast0.5sec/cm.15calibratedsweeps,accuratetowithin 5%,ina1,2,5,10.sequence,5J.Lsec/cmto200millisec/cm.Vernier pe

4、rmitscontinuousadjustmentofsweeptimebetweencalibratedstepsand extendsthe200millisec/cmsteptoatleast0.5sec/em. X5sweepexpansionmaybeusedonallrangesand expandsfastestsweep to 1 J,J.sec/cm.ExpansionisaboutthecenteroftheCRTand expanded sweepaccuracyis10%. Automaticfrom50cpsto250kc;internallyfromvertical

5、deflectionsignals. causing1/2emormoreverticaldeflection;fromexternalsignalsatleast 2.5voltspeak-to-peak,andfromlinevoltage. Zerocrossing,negativeslopeofexternalsyncsignals,zerocrossing, positiveornegativeslopeofverticaldeflectionsignals.Screwdriveroper- atedcontroloverridesautomaticandpermitsthetrig

6、gerpointtobeset between-10to+10volts.Turningfullycounterclockwiseintoautorestores automaticoperation. DCcoupled: de to 200kc.ACcoupled:2cpsto 200kc.Bandwidthisinde- pendent ofsensitivitysetting. 10millivolts/cmto100volts/cm.Fourcalibratedstepsaccuratewithin 5%,10mv/cm,100mv/cm,1V/Cfi,and 10v/cm.Vern

7、ierpermtscon- tinuousadjustmentofsensitivitybetweenstepsandextends10 v/ernstepto atleast100 v/cm. Calibratingsignalautomaticallyconnectedtoverticalamplifierforstand- ardizingof gain,accuracy2%. 1 megohm,approximately50 pfshunt. On10mv/cmrange.Inputimpedance2megohmsshuntedbyapprox.25 pf. Rejectionatl

8、east40db.Commonmodesignalmustnotexceed3voltspeak. Verticalandhorizontalamplifiershavesamephasecharacteristicswithin 20to100 ke whenverniersarefullyclockwise. DCcoupled:dcto200kc.ACcoupled:2cpsto200 kc. Bandwidthis independent ofattenuatorsetting. 0.1volt/cmto100volts/em.Threecalibratedsteps,accurate

9、within5%, 0.1v/cm,1v/cm,and 10v/cm.Vernierpermitscontinuousadjustment ofsensitivitybetweenstepsandextends10v/cmsteptoatleast100v/cm. 1 megohm,nominal,shuntedbyapproximately60 pf. Horizontalandverticalamplifiershavesamephasecharacteristicswithin 20to 100 kc whenverniersarefullyclockwise. RadioFans.CN

10、 收音机爱 好者资料库 Model 120A GENERAL Cathode Ray Tube: CRT Bezel: CRTPlates: Intensity Modulated: FilterSupplied: IlluminatedGraticule: Dimension,s: Weight: Power: Equipment Slides: AccessoriesAvailable: 00016-2 SPECIFICATIONS(Contd) 5AQPlmono-acceleratornormallysupplied; 2500 voltacceleratingpoten- tial.

11、P7andPl1phosphorsarealsoavailable.P2isavailableifdesired forspecialapplications. Lightproofbezelprovidesfirm mountforoscilloscopecameraandisre- movedeasilyforquick change offilter. Directconnection to deflectionplatesviaterminalsonrear.Sensiivity approximately20 v/cm. Terminalsonrear.+20volts to bla

12、nktraceofnormalintensity. ColoroffiltercompatiblewithCRTPhosphorsupplied: GreenwithPiandP2 AmberwithP7 Bluewith P11 Edge lighted withconttolledillumination,10emx10crn,markedincm squares.Majorhori?;ontalandverticalaxeshave 2mmsulxlivisions. Cabinet Mount:9-3/4in. Wide,15-5/8in. high,20-3/4in.deep. Ra

13、ckMount: I 8 -l J-!=;:=:!.I 1 -1-20-AR64 CabinetMount: Net 34 Ibs; shipping431bs. RackMount:Net32lbs;shipping 48lbs. 115/230 volts10%,50-1000cps;130watts. Canbeinstalledatthefactoryonspecialorderforeasywithdrawalofrack mountfromequipmentrack.Specification COl 120AR. AC-83A ViewingHood;face-fittingmo

14、ldedrubber. iii SECTIONI CONTENTS GENERALDESCRIPTIONPage 1 - 1 1 - 2 1 - 3 GeneralInformation Damage inTransit. . . . . PowerCord. I - 1 1-2 I - 2 SECTIONIIOPERATINGINSTRUCTIONS 2 - 1 2 - 2 2 - 3 2-4 2 - 5 ControlsandTerminals. Synchronization. . Calibrator. . . . . ACorDCCoupling OperatingProcedure

15、s II1 II -1 II - 1 II - 1 II -1 GeneralContent Over-AllOperation VerticalChannel . . HorizontalChannel SweepGenerator. Low VoltagePowerSupplies High VoltagePowerSupply Calibrator. . . . . . SECTIONmCmCUITDESCRIPTION 3 - 1 3 - 2 3 - 3 3 - 4 3 - 5 3 - 6 3 - 7 3 - 8 SECTIONIVMAINTENANCE III- 1 III - 1

16、III- 2 III - 3 III - 3 In- 5 III- 6 III - 6 4 - 1 4 - 2 4 - 3 4 - 4 4 - 5 4-6 4 - 7 4 - 8 4.9 4 - 10 4 -11 4 -12 4 - 13 Introduction . . . . . . . . . . Removing the Cabinet. Connectingfor230-VoltPowerLines TubeReplacement. . . . . . . . IsolatingTroublestoMajorSections CondensedTestand AdjustmentPr

17、ocedure AdjustmentProcedure . . TurnOn. . . . PowerSupplies TriggerGenerator. . . . . . . . VerticalAmplifier. . . . . HorizontalAmplifier SweepGenerator . . . . f:. IV - 1 IV - 1 IV-1 IV - 1 IV-2 IV -3 IV - 5 IV- 5 IV - 5 IV -6 IV- 7 IV - 8 IV- 9 SECTIONVTABLEOFREPLACEABLEPARTS 5 - 1TableofReplacea

18、bleParts . . . . . .V-.1 1-1GENERALINFORMATION The Model120Adcto200kc Oscilloscopeisageneral purposeoscilloscopeemployinga5AQP-mono- acceleratorprecisiontypecathode-raytube.Itcan beusedwitheitherinternalorexternalsweeps which canbeeither.internallyorexternallysynchronized anditcanbeobtainedineithert

19、hecabinetorrack type mounting.Because0itshigh sensitiVityand balancedinput,theModel 120Amayoftenbeused directlywithtransducers,enablingyoutoseea directpresentationofphenomenadesiredwithout havingtoresorttopreamplifiers.Thebalanced verticalamplifi.er mayalsobeusedasadifferential amplifieramplifyingth

20、edesiredsignalsandre- jectingextraneousinducedsignals. Theoperationofallpanelcontrolsisdiscussed.in SectionII.Because ofthestraight-forwardarrange- mentofthepanel and conventional-designations,the Oscilloscopeiseasytooperate. Someofthespecialfeaturesofthisoscilloscope areasfollows: DIRECTREADINGSWEE

21、PTIMES Whenyouareusingthe120Acomputationsare avoidedandpossibilitiesoferrorarereducedby directreading,calibratedsweeps.Asingleknob selects15calibrated sweepsfrom5microseconds/em to200milliseconds/cmordeterminesthecalibrated sensitivityofthehorizontalamplifier.Continuous controlofsweeptimeandhorizont

22、alsensitiVity betweencalibratedstepsisprOVidedbyavernier controlwhichalsoextends the 200milliseconds/em sweeptimetoatleast0.5sec/cmandlowersthe sensitivityofthe10volt/emstapofthehorizontal amplifiertoatleast100volts/em. LINEARmTEGRATORSWEEPGENERATOR Theaccuratedirectreadingsweepsareobtained from a f

23、eedbacktypeintegratorwlichinsuresa high orderlinearityandstability.Thistypeofsweepgen- eratorismorereliableandindependentoftube characteristicsthanothertypes of sweepgenerator. Sect. IPage1 SECTIONI GENERALDESCRIPTION X5SWEEPEXPANSION You speedobservationandanalysisoftransientsby expanding a twocent

24、imetersegmentofthetraceto 10centimetersforeasyviewing ofdetail.ThisX5 sweepexpander,maybeusedonallsweeptime settingsandexpandsthefastestsweeptimeto 1microsecond/cm. UNIQUEAUTOMATIC.TRIGGERING Notimeiswastedadjustingtriggercontrolsonthe Model 120A,itsautomatic,justconnectthesyn- chronizingsignaltoobt

25、ainastable,steadytrace. Theautomatictriggerendshuntingforthespotand facilitatesestablishingabaselinewhen asynchro- niZingsignalisnotpresentbecausethiscircuit triggersthesweepgeneratortoprOVide abaseline on the CRT inthe.absence of a synchronizingsignal. The automaticbaselineprovisionmaybeeasilyand q

26、Uicklylocked-outandanadjustabletriggerlevel established.Thislockoutislocatedjustbehind the frontpanelwhereitiseasilyaccessiblewitha screwdriver. CALIBRATEDAMPLIFIERS Accurate voltagemeasurementson.allkindsof wave- formsarequicklymadewiththe120A, t.heampli- fiersarecalibratedandaccuratewithin5%. Abui

27、lt-incalibratorwhichisaccuratewithin2% permitsquickverificationandstandardizationof verticalamplifiersensitiVity. Phaseshiftmeasurementscanbemadeaccurately withthisoscilloscopeoverawiderangeof input frequencies.Relativephaseshiftbetweenthe verticalandhorizontalamplifiersislessthan 2at100kc. CABINETA

28、NDRACKMOUNTrnG TheModel120AOscilloscopeisavailableasa cabinetmountforbenchorportableuseandasa rackmountforinstallationinastandard19inch equipmentrack.Only 7inchesofrackspaceis requiredforthe120ARanditmaybesupportedin Sect.I Page, 2 therackbythefrontpaneloronslidesforeasy withdrawalfromtherack.Since

29、bothmodelsare electricallyidentical anddifferonlyinmechanical placement,thisbook appliestoboth models. Theequipmentslidesareavailablefortherack mountmodelatextracost.Theycanalsobein- stalledatthefactoryonspecialorder. 1-2DAMAGE INTRANSIT After unpackingthisinstrument should any shipping damagebecome

30、eVident,refertotheClaimfor Damagein Shipmentparagraphon thewarranty sheetinthismanual. 1-3POWERCORD Thethreeconductor power cable supplied with the instrumentisterminatedina polarizedthreeprong male connector recommendedbythe NationalElec- tricalManufacturersAssociation.Thethirdcon- tactisanoffsetro

31、undpinaddedto astandard two-bladeacplug whichgroundstheinstrument chassiswhen used with theappropriatereceptacle. Tousethisplug in astandardtwocontactoutlet anadaptershouldbeusedtoconnecttheNEMA plug to the two contactsystem.Whentheadapter isusedthegroundconnectionbecomesashort leadfromtheadapterwhi

32、chcanbeconnectedto asuitablegroundfortheprotectionofoperating personnel. 2-1CONTROLSANDTERMINALS RefertoFigure2-1foracompleteexplanation of thepanelcontrolsandterminals. 2-2SYNCHRONIZATION TheModel 120AOscilloscopemaybeadjustedto synchronizeinreferencetotheinputsignal,the powerlinefrequencyorfromane

33、xternalsignal. Inaddition,inthe internal synchroniZation positions, theslopeandtriggerlevelpointmaybeadjusted. First,thepolarityof the presentationonthescreen of the cathode-raytubemaybeadjustedbyturning theSYNCswitch tostartthe sweeponeitheraposi- tive going(INT+)oranegative going(INT-)partof thewa

34、veform.Ifautomaticsweeptriggeringata zerovoltagelevelisnotdesired,rotatethe TRIG- GERLEVELcontrolout of the AUTOposition. Furtherrotationof thecontrolwilladjustthetrig- gerlevelpoint on the incoming waveformatwhich thesweepwillstart. The120Afeaturesautomaticsweep.Thisspecial circuitpresentsatraceon

35、the face of thecathode- raytube intheabsenceof an input.As Soonasa signalisfedinthe inputthesignaltakescontrol ofthesweepandtriggersthesweepgeneratorat thefrequencyoftheinputsignal. Sect.nPage1 SECTIONII OPERATINGINSTRUCTIONS 24ACORDCCOUPLING ACcouplingpermitshighgaintobeemployedwith- outregardforth

36、edelevelinvolved.IntheACpo.- sitiontbe input signal(verticalorhorizontal)is coupledtotheamplifierthrough acapacitorwhich removesthedccomponentfromthe input.This couplingcircuithasalowfrequencycut-offat 2cps.To avoiddegradinginputpulsesorsquare waves below200cp.sitisadvisabletouse dccoup- Uog4.WHENUS

37、ING,DCCOUPLINGTHEDCCOM- PONENTMAYBELARGEENOUGHTODEFLECT THETRACEOFFTHEFACEOFCRT.IFYOU ARE UNABLETOFINDTHETRACEWITHTHE VEltTICALPOSlTIONCONTROLTRYACCOUP- LING.WhenACcoupledthemaximumdcthatmay beappliedis600 volts. 2-5OPERATINGPROCEDURES Basicoperatingproceduresareillustratedin.the drawingsthatfollow.

38、Directionsaregivenforthe cabinet model butarethesamefortherackmount modelexceptthattheplacementofthecontrols isdifferent. Thefirsttwoproceduresarecomplete.Theothers arearrangedto supplement the-firsttwo byshOWing thevariationspossibleinusingtheoscilloscope. Anindextotheseillustrationsfollows: 2-3CAL

39、IBRATOR Aninternalsquare-wavecalibrator,with a nominal. frequency of 400 cps,isprovidedforcheckingver- ticalamplifiercalibrationaccuracy.Thecalibrator 60millivoltoutputisconnectedinternallytothe verticalamplifierwhentheVERT.SENSITIVITY switchisplacedinthe CAL. position.Noprovision ismadeforinternalc

40、onnection betweenthehoriz- ontal amplifier and thecalibrator.Horizontalampli- fiercalibration canbechecked easily,sinceanex- ternalsignal canbemeasuredon theverticalampli- fierandthenappliedtothehorizontalamplifier. FIG. 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12 TITL-E InternalSweep-InternalSyn

41、chronization InternalSweep-ExternalSynchronization ACCoupling-BalancedInput ExternalHorizontalInput VerticalBalanceAdjustment VerticalSensitivityCalibration InternalSweepMagnification ConnectiontoDeflectionPlates IntensityModulationOperation Aligning ScopeTracewithGraticule ConnectingExternalCapacit

42、orsto ExtendSweepTime oROTATETOMOVETRACEVERTICALLY. SETFORIVERT.SENsITIVITyDESIRED. SETTOICAL.IFORCALIBRATINGSIGNAl.- SWITCHOUTOFgPOSITIONTOADJUSTBETWEEN RANGESOFIVERTSENSITIVITYISWITCH. OFF SElECTJORCOUPLINGfORVERTIALINPUT.II=M) SETGAINOfVERTICALAMPLIfiER. REMOVESHORTINGBARWHENCONNECnNGABALANCEDINP

43、UTSIGNAL 0) HORll.POS. LO-1558 Lo-r-IIU DROTATECLOCKWISETOTURNON. IAH30SECOIDS. THENADJUSTTRACEINTENSITY. SET.TOISWEEPTIMEIDESIREDORTOIHaRtZ.SENsl DESIRED SWITCHOUTOf.POSITIOIITOADJUSTBETWEENRANGESOf SWEEPTlMEIORIHORlz.SENslSWITCH. SELECTORCOUPLING(HORtZONTAlINPUT). (ACCOUPLINGONLYWITHSYNCSIGNALS.)

44、.SETTOGfORUNEXPANDEDSWEEP SET10FOREXPANDEDSWEEP ROTATECOUlTERClOCKWISEFORSWEEP (ROTATECLOCKWISETOADJUSTITRIGGERLEVELI). ADJUSTfORSTATIONARYVERTICALPOSITIONOFTRACEWITHMAX.TONIN; OPERATIONOFIVERT.SENSITIVITVIIVERNIERI TOOBTAINAPATT.ERNEASilY,SETTHECONTROLSEXACTLYAS SHOWNANOPE,RfORMlHENUMBEREDSTEPSINSE

45、QUENCE. USESAMEPROCEDUREWHENEVERDIffiCULTYISENCOUNTEREDINOBTAlHtNCAPATTERN. THtSWILLEUMIIATEFAULTSDUETOMISALIGNMENIOFCONTROlS,AND.IlLISOLATEANY TROUBLESTOMAJORSECTIONS. SETT01INT.+lORINT-IfORINTERNALSYNCHONIZATION. SETTolLINEITOSYNCHRONIZEATLINEFREQUENCIES. SETTO(EXT.IfOREXTERNALSYNCHRONIZATION. fig

46、ure2-1.frontPanelControlDiagram Sect.nPage3 INTERNALSWEEP-INTERNALSYNCHRONIZATION 2 1.FeedverticalinputsignaltoverticalINPUT terminals.Removejumpertousebalanced input (10mvonly). 2. Set AC-DCswitchfortype couplingdesired. 3.AdjustVERTICALSENSITIVITYcontrolfor desiredsensitivity. 4. SetSYNCHRONIZATIO

47、NswitchtoINTERNAL + .or- , depending uponslopeoftriggerpoint desired. 5.AdjustSWEEPTIME-HORIZONTAL SENSI- TIVITYcontrolfordesiredsweepspeed. 6.IfAUTOMATICsweepisnotdesired,rotate TRIGGERLEVELcontroltoselectlevelof triggerpoint. Figure2-2. Sect.nPage 4 INTERNALSWEEPIiEXTERNALSYNCHRONIZATION 4 7 1.Fee

48、d.vertical inputsignaltoverticalinput terminals.Removejumperforbalancedin- put(10mvonly). 2.SetAC-DCswitchtotype of input coupling desired. 3.AdjustVERTICAL SENSITIVITYcontrolfor desireddeflection. 4. Feed external synchronization signal tohori- zontal inputterminals(accoupling only with external sy

49、nchronization). 5.SetSYNCHRONIZATIONswitch toEXTERNAL. 6.AdjustSWEEPTIMEHORIZONTALSENSI- TIVITYcontrolfordesiredsweepspeed. 7.setTRIGGERLEVELcontroltoAUTO- MATIesweeporrotateTRIGGERLEVEL controltodesiredtrigger-levelpoint. Thisprocedureisusefulwhenitisdesiredto observe phenomena occurringatrandom intervals. Figure2-3 Sect.IIPage5 AC COUPLING-BALANCEDINPUT 3 ROle 1.setVERTICAL SENSITIVITYcontrolto 10millivolts/em,input notbalancedon higherranges. 2.SetAC-DCswitchto AC. 3.Disconnectsho