HP-1784B-Manual-sn415 电路图.pdf

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1、OPERATINGANDSERVICEMANUAL J MODEL17818 DELAYGENERATOR HEWLETTPACKARD RadioFans.CN 收音机爱 好者资料库 CERTIFICATION I1uHewkttP.2CleardCompanycerlifiesthtthisinstrumentW4S thoroughly testedandinspected andfoundto meet its published spt!Cifieations whenitwasshippedfrom theftory.The Hewlett- Packard Company fur

2、ther certifies thatitscalibrationme4SUre- mentsaretraceabletotheu.s.Natiorn11BureauofStandardsto theextentallowedbythe Bureaus calibration facility. WARRANTYAND ASSISTANCE All Hewlett-Packard produl;ts are warranted against defects in materialsandworkmanship.Thiswarranty applies for onc year fromthe

3、dateofdelivery.or,inthecaseofcertainmajorcom- ponentslisted intheoperatingmanual, forthespecified period. Wewill repairorreplaceproductswhich provetobe defective duringthewarrantyperiod.Nootherwarrantyisexpressed or implied.Wei1rCnotliable for consequential damages. Servicecontractsorcustomerassista

4、nce agreementsareavailable for Hewlen-Packardproductsthatrequiremaintenanceandre- pair on-site. Foranyassistancecontactyournearest Hewlett-Packard Salesand Service Office. Addresses are providedatthebackofthismanual. RadioFans.CN 收音机爱 好者资料库 OPERATINGANDSERViCe:MANUAL MODEL1781B DELAYGENERATOR SERIAL

5、S PREFIXED:415 (ForOtherSerialPrefixInstruments Se.SectionIandAppendixI) C.rightHEWlETT.ACKARDCOMANY963 1S01AOEMillaOAD.AlOALTO.CAllfORNA.,U.S.A. 115313PRillEl:leT1115 RadioFans.CN 收音机爱 好者资料库 Model 1781B Delay Genera.tor SerialsPrefiXed:415 Stock No. 1781:8-903 Model1781BTableofContents ListofIllust

6、rationsandTables TAUOFCONTENTS 6-1 6-1 6-1 Page 4-4 4-5 1-1 I VIREPLACEABLEPARTS. 6-1.Introduction. 6-4.OrderingInformation VMAINTENANCE5-1 5-1.Introduction5-1 5-3.TestEquipment5-1 5-5.PerformanceGhecks5-1 5-8.Troubleshooting5-1 5-10.SystemTroubleshooting5-1 5-12.SectionalTroubleshooting.5-1 5-14.Lo

7、cationofParts5-1 5.16.Adjustmnts5-1 5-18.PresetAdjust5-6 5-19.TriggerSensitivityandSymmetry,5-6 5-20.Sweep LengthAdjust5-7 5-21.SweepCalibration.5-7 5-22.Dela,yLength-DelayingSweep Adjust5-8 5-23.CondensedAdjustmentProcedure5-9. 5-25.RepairandReplacement,.5-10 5-26.ReplacingComponents.5-10 5-28.Adju

8、stmentsAfterReplacement.5-10 Section 4-27.SchmittTrigger 4-30.TunnelDiode 4-1 4-1 4-1 4-1 4-2 4-3 4-4 3-1 3-1 3-2 3-2 3-2 3-2 3-3 3-3 Page 1-1 1-1 1-1 2-1 2-1 2-1 2-1 IVPRINCIPLESOFOPERATION 4-1.OverallFunctionalDesription 4-3.DelayingSweepGenerator. 4-5.AmplifierandTriggerGenerator 4-9.SweepGenerat

9、or 4-17.SweepSelection 4-22.DelayedTriggerGenerator APPENDIXI. LISTOfILLUSTRATIONS illOPERATING INSTRUCTIONS 3-1.Introduction 3-3.PreparationforUse. 3-6.OperatingControls 3-8.SweepStartControls 3-14.DelayControls, 3-21.OperatingConsiderations 3-28.OperatingProcedures Section IGENERAL INFORMATION 1-1

10、:InstrumentDescriptionandUses 1-4.ManualIdentificationandChanges. nINSTALLATION. 2-1.lncomingInspection 2-4.Installation. 2-6.RepackagingforShipment NumberTitlePage 1-1.Model 1781BDelayGenerator,-0 1-2.WaveformsIllustratingSweepCombinations UsingModel 1781B1-2 5-8 5-18 Page 5-1 5-G 5-7 5-8 NumberTit

11、le 5-1.FunctionalBlockDiagram 5-2.LocationfTestPoints 5-3.Location ofAdjustments 5-4.TriggerAdjustmentWaveforms. 5-5.LocationofPartsMounted on Switch AssembliesA3andA4 5-6.LocationofParton SweepTimeSWitch, Right View,.5-13 5-7.LocationofPartson SweepTimeSWiteh, ftView5-13 5-8.LocationofPartsonCircui

12、tBoard,5-14 5-9.SweepGeneratorSchematic,.5-15 5-10.DelayedTriggerGeneratorSchematic.,5-16 5-11.DelayingSweepTimeSwitchSchematic.,5-17 5-12.SweepSelectorandDelayFunction SwitchesSchematic 4-1 4-2 4-4 4-5 4-5 3-2 3-4 3-5 3-6 3-7 3-8 OverallBlockDiagram DelayingSweepGenerator DelayedTriggerGenerator Si

13、mplifiedSchmittTriggerandWaveform TunnelDiodeOperation FrontPanelControls DelayingSweep, Main Sweep,DelayedandTriggered MainSweep,Delayedand Almf:!d Mixed Sweep, Single Sweep, 4-1. 4-2. 4-3. 4-4. 4-5. 3-1. 3-2. 3-3. 3-4. 35. 3-6. LISTOFTABLES NumberTitlePage 1-1.Model 1781BSpecifications(withIi;Mode

14、l 175AOscilloscope)1-1 NumberTitlePage 5-8.DelayTriggerGeneratorTroubleshooting.5-5 5-9.SweepCalibration5-8 5.10.Model1781BCondensedAdjustment Procedure.5-9 5-11.AdjustmentsRequiredFollOWing Tube, Transistor,orDiodeReplacement,.5-11 5-12.CalibrationandComponentReplacement Record.5-12 5-1. .5-2. 5-3.

15、 5-4. 5-5. 5-6. 5-7. RecommendedTestEquipment TriggerSensitivityCheck DelayingSweepAccuracyCheck Delaying SweepLinearityChck SystemTroubleshooti,ng DelayingSweepTriggerCiruits Troubleshooting. DelayingSweepGenerator Troubleshooting 5-0 5-0 5-2 5-3 5-4 5-46.1, 6-2. 6-3. ReferenceDesignationIndex Repl

16、aceableParts, CodeListofManufacturers 62 6-7 6-10 01537-3iii Model1781B APPENDIXI MANUALCHANGES Appendix 1. ThisappendixcontainsinformaliQIlonchangesrequired toadaptthismanualtoaninstrumentwith a .serial prefixlistedinthetablebelow.Checkforyourin- strumentserialprefixandmakenumberedchanges indicated

17、.Notethatthesechangesadaptthemanual .tocoveraparticularinstrumentasmanufacturedanct thereforewillnotapplytoaninstrumentsubsequently modifiedinthefield.ConsultyourIf8ale/Serviee. Officeforinformationonrecommendedfiedmodifi. cations.ReferbacktoSection1forinfotnUitionj)1i erratainthismanualandonanyothe

18、ril1$tWlll.t serialprefixnotcoveredinti$appellcUR:fxd, comp,1 Mohm,10O,1/2W;Mil01121;Mil PartNo.EB1051. CHANGE2 .page5-16,.Figure5-10,. lfttC.l;V,.th. TaM.$!(1iViq6.l,. Ia$:2:Cf.ltlto1ijt.$tlek)io.0686-363t1;R:fxd, ()OlnP:,UKol!lM,6%,I/2W;MlOI121;Mil PaltNo.EB$5. (:HANGE3 412- 30OO526to00975 320,001

19、76 to 00525 309- 305- 1, 2 1, 3 I,2 1tllru4 1thrll3,i Pag5-16,FitUle10, Res:Changevalueto5KfJilm.s. Tables6-1and6-2, AB:Chngeto.,Stot;lkNo.0757-0092;R:val, camp,3sect,5K-5K,.25J.F. C40:Changevalu.tQnQP:r C41:ChangevahUto56:PF R75:Deleteandrernoveconnection. R87:Changevtilue to1Mohm. Tables6-1and6-2,

20、 C37:Changeto$j)StockNo.0160-0015;C:fxd, paper,0.471Jf,1O%,200VDCW;Mfr56289; MfrPartNo. 109147492. C38:Changeto1$:StockNo.0170-0060;C: fxd, my,O.047,to%,400VDCW;Mit84411;MIt PartNo.Type663 UW. C39:Changetoi!StockNo.0140-0170;C:fxd, mica,5600PF,5%, 300VDCW: Mfl 04062;Mfr PartNo.DM20F562J. C40:Changet

21、o1f.StockNo.0140-0044;C;fxd, mica,560PF,10%NPO,500VDCW;Mh28480; MfrPartNo.0140-0044. C41:Changeto!i:StockNo.0140-0014;C:fxd, mica,56PF10%,500VDCW;Mfr.00853;MIl PartNo.TypeDR1456BlO. 1-1 CHANOI14 Pae5-17,Figure5-11, Q3:Maybe.i4hertypeN2048(sStocNC).1902-0056;Semicondevice; .diode,breakdown;Mfl 28480;

22、MfrPartNo. 1902-0056. Q3:Changeto.t.,.StockNo.1850-0070;Transist(ll: germanium,PNP2N1373;Mfr01295;111Part No. 2N1373. CHANGE5 ge5-15,Figure5-9, V12:Delete. Page5-17,Figure5-11, Q3:May beeitheraselectedtype,1;1StockNo. I8500062orastandardtype2N1370(preferred replacement). Tables6-1and6-2, Q3:Changeto

23、fStockNo.1850-0065;1ransistor: PNP,2N1370;Mfr01295;MilPartNo. 2N1370. (PreferredRenlacement). V12:Delete. 01537-3 SectionI Figure1-1 Model 1781B SWEEP SELECTOR DELAYINGSWEEP TIME Wla MXED.A,1f 52ISIHIILl .5MAlN .2 SEClOll ARM FUNCTION fluttER ELAY GENERATOR *17818 DELAY LENGTH eM PRESET swEEPMODE TR

24、IGGER SOURCE E ACtNT EXT.I INPUTTRIGGERrREfRUN .DC LOCK ;- J Figure1-1.Model1781B DelayGenerato 1-0 01537-2 Model 1781B SECTION I GENERALINfORMATION Section I Paragraphs1-1to1-5 1-1.INSTRUMENT DESCRIPTIONANDUSES. 1-2.TheHewlett-PackardCompanyModel 1781B DelaGeneratorplug-in(showninfigure1-1)provides

25、 theModel 17MOaciUoslQlle.ToinstalltheModltl17IreQWive. a.UpoNib1e,uetheoriginalcontainerdesigned fortheinstrum.ent. b.WraptheinstrumentinbeavypaperOrplastic hefonplacingitintheship;/inlicontainer: c.l).tyQ$paQkimaterialaroundlillside. Qtthoinlltuunt,andprotectpanelfacea. withcarQ.- boUd. d.Usea.hea

26、vycardl;loa.rdcartonOr woodenboxto housetheinstrumenta!Idusehea.vytapeormetalba.nQ tosealthecoowner. $.packingbOxwithHFrle,Delicate Instrum.tnlti,oretc,asappropriate. Note IftheIJ:lentistosh1llPldtoB.-wlett- hea.rdforserviceOrrepair,attachtothe in.sQumentataghldentifyinctheowneran indicatingtheservi

27、ceorrepairtobea.ccom- p.Inanycorrespondence,identitythe i.n.tItrUtnentbymodelnurnbfar,.ria.!numr, llDd.rialnumberprefix. SECTIONIII OATINGINSTIUCT,IONI 3-1.INTRODUCTION. 3-2.TheMOO!il11781B 1s aplug-inUnitforl,laewith theModell75AOscilloscope.Theunitr;eneratesa lineardelayingsweepwhicb.isusedtosweth

28、etrace ordelaythepresentationofthemainswpfora.se- lectedtimeintervalatteraninputtr1KPr.Atthe8flcot ofthedelayperiod,theMbdel17lHBproducesatrigger pulsewhichcaneithertriggerorarmthemains9ieep, dependinguponthedelayfunctionselected.Afterthe trigger,themainsweepcanbeusedtotakeoverthe display,dependingo

29、nsettingsofModel178113and OscillO$copecontrols.Thetriggerisalsoavailable atthefrontpanelfor.externaluse.Thesweepor 01537-2 combiIltionof.lllweepstoappearunthecrtisdeter- minedbyoneoffivesweep.liIe14HlUoQ$:1):otLAYING inwhichdelayingsweepdrivesthetraceacrossthecrt an4tht!Idelayedmainsweepappearsasani

30、ntenMified Iilegrnentoftbedelayingsweep;2HIINDELAYED,in whichu.edelayeaJl1;ainsweepdrivesthetracecros. thecrt;3)MlUD,inwhichthedelayingsweepdrives thetn.ceacrosstbe,crtfora.ppronmatelythedelay periodll$themainsweepcomplettstrace;4) MAIN SlNCLE,.inwhichthemainsweepoccursonly oncewith nodelaywhentrigg

31、er.a,aM.muatbere- armedbeforeanothertriggerisetftetiVe;and5)MAIN inwhichthemainsweepoperatesnormallyanddrives traceaeroaathecrtwithno d.-lay. sectionill Paragraphs3-3to3-17 3-3.PREPARATIONFORUSE. 3-4.FortedaccuracyoftheModel 1781Boper- atinginany Model 175AOscilloscope,makesurethe +110voltand-100vol

32、tpowersupplyvoltagesinthe oscilloscopearewithin 0.4%oftheirnominalvalues. RefertotheMMODEtermj.rieswhethertbedelaying sweeprequiresaterorfreefUns.Thecontrol iscontinuQl;UIlyadjustablewith aswitchedPRESET positionatitscounterclockwiseextreJ)le.ThisPRE- SETpositionisinternallysetforoptimumtrigger oper

33、ation.Forveryhighfrequencytriggersignals, itmaybedesirabletouseafree-runningmodeof triggeroperation.Maximumstabilitywillbeobtained withslightre-adjustmentof SWEEP MODI; andTRIG- GERLEVELcontrols. 3-14.DELAY CONTROLS. 315.TheFUNCTION,DELAYINGSWEEPTIME, LENGTH,andSWEEPSELECTORcontrolsallaffect thedela

34、yorthewaythedelayappearsonthecrt. 3-16.FUNCTIONdetermineswhethertheModel 1781B triggersotarmsthemainsweepattheendof thedelaypel:iod.WithFUNCTIONsettoTRIGGER, theModel17MBstartsthemainsweepimmediately afterthedelayperiod.Aftercompletingitscycle, themainsweepisreadyforanotherstarting.trigger fromtheMo

35、del 1781B. 317.WiththeFUNCTIONsettoARM,theModel 1781BaItnlSbut(Ioesnot$tartthemainsweepatthe endofdelayperiod.Themainsweepthenrequires atriggeTasselectedbythe.TRIGGERSOURCEswitch oftheoscillOSCOpe.Afteronecycle,themainsweep remainsdisableduntilrearmedbyModel 1781B. ADJUSTLEVELOFTRIG- GERPOINTONTRIGG

36、ER SIGNAL SELECT SLOPEOFTRIG- GERSIGNALATTRIGGER POINT SELECT TRIGGEREDOR ARMED MAIN SWEEP AFTERDRAYPERIOD ,rtt-_DEPRESSTO ARM MAINSWEEP DELAYINGSWEEP SELECT HORIZONTAL pRESENTATIONONCRT 3-2 Figure3-1.FrontPanelControls 01537-2 11*117818 3-18.DELAYINClSWEEPTIMdetetrniDe.tblI*8Weep timeofthedelasweep

37、 1Iibet1lerornotthedelaying $weepappearsonthecrt.Tbispeepisthltreference fordelayme-.ureinents. 3-19.LENGTHdeterminesdelay lengthmeuuredin centimetersalongthedelaying sweep.Tmathedelay periodistheproductoftheLENGTHandDELAYlNG SWEEP TIMEsettings. 3-20.SWE:EPSELECTORdeterminesthehortal presentationont

38、hecrt.Therearefive oPttolUl explainedasfollows: a.DELAYING.T_BWteJldrive.the traceacroasthecrt.Themamsw.eptriggered(or armed)attheendf.thedtlap.tiodand.theate intervaloftMmatn.e11i.ndiwabrifbt,iO1I 0 2 4 5 1 118.a-o- 836 9 1.Set SWEEP SELECTOR to DELAUNO. 2.Set TRIGGER SOiRCEasdeSired.Ifexternal tri

39、ggerisused,connecttriggersignaltoEXT. INPUT. 3.Set TRIGGER SLOPEfortriggeringonpositive ornegative slope oftriggersignalasdesired. 4.Set SWEEPMODEtoPRESET. 5.Set TRIGGER LEVELtoO. 6.SetDELAYING SWEEP TIMEtodesiredsweep time. 7.ResetTRIGGER LEVELtostarttraceatde- siredsignallevel.Ittnaybeneces.saryto

40、switch SWEEPMODEfromPUSETandselectabetter settingforthepa.rticulrsignalbeing viewed. 8.Adjust LENGTHfordesireddelayperiod. 9.Adjustlengthofintensifiedsegmentwithoscil- loseopeSWEEP TIME. Figure3.2. Delaying Sweep 01537-2 Model1781:8 C;4UATQIt KCVOI.U 0 rl) o o oJ.Il. .i.,. . o):/ eA!.1.i.TfO0 Bectio

41、nIII 1igU1e8.3 01537-2 1.Performsteps1thru9, figure3-2. 2.SetSWEEPSELECTORtoMAIN DELAYED. IMpr$sentationistheintensittedsegment ed.TMexpansionratiois(DELAY- INGSWEEPTIME) : (SWEEP TIME). Figure3-3.MainBwee;p,DelayedandTrluered Sectionm FigureS-4 4 . o OSCILLOICOl l:-: 3 Model 1781:8 1.SetFUNCTIONtoA

42、RM. 2.Setdelayingsweepaccordingtofigure3-2. 3.SetSWEEPTIMEsointensifiedsegmentin- cludesthatpartofsignalyou wanttoseeon delayedmainsweep. 4.settheSWEEP SELECTORtoMAINDELAYED. 5.Triggerthedelayingsweepandthemainsweep internallyorexternally: a.Internally: SetbothTRIGGER SOURCEcontrolsto!NT b.Externall

43、y: (1)setoscilloscopeTRIGGER SOURCEto !NTJandModel 1781:8 TRIGOElt SOURCE toEXT.ACorDC. (2)ApplyexternaltriggersignaltoModel 1781BEXT.INPUT. (3)Theexternalsignaltriggersthedelaying sweepwhicharmsthemainsweepatthe endofthedelayingperiod.Thenext pulsefromtheinternaltriggergenerator triggersthemainswee

44、p. 6.TheMAINSWEEP ARMEDindicatorlightsat endofdelayperiod,indicatingmainsweepcan sweep.Aftersweep,indicatorgoesout, andmain$Weepisdisableduntilre-armedby delayingsweep. 7.TbemainSweepiseJq)anded.Expansionratio is(DELAYINGSWEEPTIME) : (SWEEP TIME). 3-6 Figure3-4.MainSwe.ep,DelaYeQandArm.ed 01537-2 MQ

45、del1781B sectionm F1r.3-5 I-A-A DE:LAYING PERIOD C61.1.IIATOfl ,.:01.$ 3 4 . -L+T= 01. . 3 1256 1.SetSWEESEWlCTORtoMIXED. 2.SetFUNCTIONtoTRIGGER. 3.SetSWEEPMODEonoscilloscopeandModel 1781BtoPRESET. 4.Triggerdelayingsweepasdesired.(Ifexternal triggeringisused,connecttriggersignalto EXT.INPUT.) 5.SetD

46、ELAYINGSWEEPTIMEtodeSiredsweep time. 6.SeUwmEPTIMEtodesiredsweeptime(faster thandelayingsweep). 7.SetLENGTHfordesireddelayingperiod.(De- layisnotcalibratedinmixedsweepoperation.) 01537-2 Fire3-5.Milted SWeep 3-7 Sectionm Figure3-6 OSC,tlOSCOl IIW.r:*AflO MOdel 1781B .,.-. 2 543 1.SetSWEEPSELECTORtoM

47、AINSINGLE. 2.SetoscilloscopeTRIGGER SOURCEaccording totriggersignalused. 3.SetoscmoscopeTRIGGERSLOPEandTRIG- GERLEVELasdesired. 4.Toarmsweep,depressandreleaaeARMswitch. 5.MAIN8WEEPARMEDindicatoronMode1178lB shouldlight.Asignalfromtheverticalchannel triggersthecircuittoproduceasinglesweep, and asingl

48、etraceisdisplayed.Attheendof thesweeptheMAINSWEEP ARMEDindicator goesoff.(Thisoperationisusefulintheob- servationandphotographyoftransientsignals whicharenotrepetitive.) 6.Repeatstep4 (above)tore-armsweepafter eachtrigger. 3-8 Figure3-6.SileSwe.ep 01537-2 MoQl17118 saCTIONIV ,tNCIPL0OATtON 8eetioAIV

49、. Paragrapbll4-1to4-8 4-1.OVERALLfUNCTIONALOESCRIPTION. 4-2.TheModel 1781BproVidesthe*Model17M OsCilloscopewithdelayedsweepoperation.Theunit insertsa knownamountofdelay,y,rhiebcanQeselected atthefrontpanel,betweenarefer 3, 5; 7,and11).tll.delaying sweepgeneratorcontainsamplifyingand8h.apcir- cuits(VI,CRl,andQ1)andp;tingrircuits(VO).the amplifyingandshapingcirW1t$provideadequatetrig- geringofthesweepcircuits,andthegatingcircuits providetmblan1dngtothecrt. 4-6.Theinputorreferencetriggerisappliedtoone gridoftub