HP-200T-Manual-snprefix-036 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 ! On-line curator: Glenn Robb This document is for FREE distribution only! RadioFans.CN 收音机爱 好者资料库 OPERATINGAND SERVICINGMANUAL MODEL200T PRECISIONTELEMETER TESTOSCILLATOR SERIALSPREFIX

2、ED:036- - , RANGE PRECISIONTELEMETER TESTOSCILLATOR .,.:.- HjIit.enPACK .u10eAUfOllfllA NORTHSHORELTD. 1074CheltenhamRd. SantaBarbara.Calif.93105 00042-2 CopyrightHEWLETT-PACKARDCOMPANY1959 1501 PAGE MILL ROAD,PALOALTO, CALIFORNIA,U.S.A. Printed3/61 RadioFans.CN 收音机爱 好者资料库 , Model200T FREQUENCY RANG

3、E: SPECIFICATIONS 250cpsto100 kc with wideoverlapatbothendsofeachrange. RANGES:250cpsto1000cps; 800cpsto3200cps; 2500cpsto10 kc; 8 kcto32 kc; 25 kcto100 kc. CALIBRATION ACCURACY: FREQUENCY RESPONSE: FREQUENCY STABILITY: OUTPUT: INTERNAL IMPEDANCE DISTORTION: HUMANDNOISE: POWER SUPPLY: DIMENSIONS: WE

4、IGHT: 1%longterm.Screwdriveradjustmentsonfrontpanelfor precisecalibrationofeachrange. 1 dbentirerange(reference:5 kc) ShortTerm:Lessthan 0.02%+0.5cyclesdriftperhourat constantambienttemperatureafteronehourwarm-up. Temperature:Lessthan0.5%change,forambienttemper- atureslOoCto500C(reference:20C). Powe

5、rSupply Voltage Stability:Lessthan0.1%frequency changeforvariationsof10%fromnominal115 voltline (103voltsto127volts). 160milliwattsor10voltsacross600-ohmratedload,or 20voltsopencircuit. 600ohms.Outputisbalancedtoground within1%forzero positionof outputattenuator.Unitmaybeoperatedoneside grounded. Le

6、ssthan 0.5%entirefrequencyrange.Distortionnotaffected byloadimpedance. Lessthan 0.03% ofratedoutput voltage. 115/230volts10%, 50to1000cps,approximately160watts. CabinetMount:18-3/4in.wide,9-3/16in.high,11-3/4in. deep. RackMount:19 in. wide,8-3/4in. high,10-15/16in.deep behindpanel. CabinetMount: Net

7、27lbs.,shipping36lbs. RackMount:Net 28lbs.,shipping36lbs. iii RadioFans.CN 收音机爱 好者资料库 SECTION I CONTENTS GENERAL DESCRIPTION Mode1200T PAGE 1 - 1 1- 2 1 - 3 General. PowerCable. . . . . . . . . . . . . . . . PowerTransformerPrimaryConnections I - 1 I - 1 I - 1 SECTION IIOPERATING INSTRUCTIONS 2 - 1

8、2 - 2 2 - 3 ControlsandTerminals OperatingProcedure. OutputCircuitOptions . II - 1 II-1 II - 1 SECTIONIIICIRCUIT DESCRIPTION 3 - 1 3 - 2 3 - 3 3 - 4 3 - 5 General. Frequency-ControllingBridge. Amplifier. OutputCircuit PowerSupply. III - I III - 2 III - 2 III - 2 III - 3 SECTIONIVMAINTENANCE 4 - 1 4

9、- 2 4 -3 4 - 4 4 - 5 4 -6 4 - 7 4 - 8 4 - 9 4 -10 4 - 11 4 -12 4 -13 4 - 14 4 -15 4 -16 General. OperationalCheck CoverRemoval. Lubrication,Tuning-CapacitorDriveMechanism TroubleShooting. . . . . . . . . TroubleLocalization. . . . . . . Power-SupplyLocalizationCheck. VoltageRegulatorAdjustment. Chec

10、kforCauseofDistortion. . TubeReplacement. ReplacementofLampsR184 6 G OUTUT 5 3 RANGE AXIl( IX100BXIK A.XIOOAX 10K -+-(0 1.Selectfrequencyrangeofoperation. 2.Vernier,adjustfrequency. 5.Adjustoutputvoltagelevel.Outputbalanced togroundonlywithAMPLITUDEcontrol infullclockwiseposition. 3.Readfrequencyofo

11、perationmultipliedby RANGEswitchposition.Thereisatwo- bandcalibrationoftheFREQUENCYdial. TheA bandiscalibratedfrom2.5to10, andtheBbahdfrom8to32. 6.Jumperfor600Qunbalancedoutput.Remove jumperfor600Qbalancedoutput. 4.Turnonpowertoinstrument.Whenthein- strumentisturnedon,theindexwindowwill beilluminate

12、d. FUSE-Thefuseholder,locatedontheback oftheinstrument,containsthepowerlinefuse. Characteristicsofthisfusearegiveninthe TableofReplaceableParts(SectionV). Figure2-1 Model200T 2-1CONTROLSANDTERMINALS RefertoFigure2-1foranexplanationofthe controlsandterminals. 2-2OPERATINGPROCEDURE 1) Withtheinstrumen

13、tpluggedintoapowersource ofspecifiedvoltageandfrequency.andthepower switchON. allow awarm-upperiodofapproxi- matelythirtyminutes. 2)Thefrequencyoftheoutputvoltageisdeter- mined(a) bythesettingof thefrequencydialand (b) bythesettingoftheRANGEswitch.Forex- ample.toobtaina1000-cycleoutput.setthefre- qu

14、encydialat10 on the Bscaleandthe RANGE switchatBXlOO(10 x 100is1000). 3)TurntheAMPLITUDEcontroltothezeropo- sition.Maketheconnectionbetween the Model 200Tandtheequipmenttobedrivenatthetermi- nalsdesignated600Q.(Connectionsarediscussed inparagraph2-3.OutputCircuitOptions.) TheModel200Tmaybeoperatedin

15、toaloadofany valuewithouteffecton the outputwaveform.The 200Tmaybeconsideredasa20-voltgenerator witha600-ohminternalimpedance. 4) AdjusttheAMPLITUDEcontroltoobtainthe desiredlevelofoutputvoltage. 2-3OUTPUTCIRCUITOPTIONS TheoutputcircuitoftheModel 200Tmaybear- rangedforbalancedorunbalancedoperation.T

16、yp- icalconnectionsforeachareindicatedinFigure2-2. A.UNBALANCED OPERATION Tooperatewithonesidegrounded. astrapis placedbetweentheGterminalandthecenterter- minal.asindicatedinFigure2-2A. Sect,IIPage1 SECTIONII OPERATINGINSTRUCTIONS B.BALANCED OPERATION Connectionsforbalancedoperationareindi- catedinF

17、igure2-2B.(Thebrokenlinefromthe groundterminalindicatestheoutputcircuitisbal- ancedtoground.withinthetolerancesgiven below.) TheAMPLITUDEcontrolinthe outputcircuitisa bridged-teeattenuatorandatanysettingexcept 600Q Toequipment beingdriven G A.UNBALANCED OPERATION 600Q Toequipment beingdriven G B.BAL

18、ANCED OPERATION Figure2-2.TypicalOutputConnections Sect.IIPage2 mlTIlmUmattenuationunbalancesthecircuit. ThereforeforbalancedoperationtheAMPLITUDE controlmustbesetformaximumoutput (fullclock- wise).Outputbalancealsoisa functionoffre- quencybecauseofcapacitivefeedthroughathigher frequencies.Upto10 kc

19、,however,unbalance islessthan 0.1%,andat100 kcisapproximately 0.3%.Ifsmalloutputsaredesired,orifbalance athigherfrequenciesiscritical,turntheAMP- LITUDEcontrolmaximumclockwise,andconnect anexternalbalancedattenuator,designedforthe frequenciesinvolved, betweentheModel 200T and theload. Figure2-3indic

20、atestheareawherelessthan1% unbalancemaybeobtained.Thischartindicates balanceobtainableatvarioussettingsoftheAMP- LITUDEcontrolwhenoperatingintoa600-ohm load.Whereothervaluesofloadareused,thechart doesnot applydirectlybutdoesapplyforsettings oftheAMPLITUDEcontrolthatwouldproduce theindicatedvoltageac

21、rossa600-ohmload. Mode1200T 10 - - -z:,- - -! = - 8 - S I 6 CD LESSTHAN 1%UNBALANCE . . - 4 . - : . = 2 0. . = 250100KC FREQUENCY Figure2-3.BalanceChartOperatinginto 600-ohmLoad . Model200T Sect. IIIPageI SECTIONIII CIRCUITDESCRIPTION 3-1GENERAL TheModel 200Tusesabalanced(push-pull)oscil- latorcircu

22、itfromwhichtheoutputistakendirectly, avoidingthecomplicationandpossibledistortionof anisolatingamplifier.Reaction oftheloadonthe oscillatorisavoidedbytheuseofazerosourceim- pedanceoutputstage.Thisarrangementresultsina simple,trouble-freecircuithaving lowdistortion andhighstabilityovertheentirefreque

23、ncyrange. Functionally,circuitsof the Model 200Tinclude afrequency-controllingbridgeandbalancedpush- pullamplifierwhichconstitutetheoscillatorcir- cuit,anoutputcircuitwhichmaybearranged eitherforbalancedorunbalancedoperation,and aregulatedpower-supplycircuit.Theseareshown inblockdiagramforminFigure3

24、-1andindetail ontheschematicdiagram. BALANCED PUSH-PULLAMPLIFIERCIRCUIT BRIDGED TEE ATTENUATOR AMPLITUDE CONTROL 6OO.n. FEEDBACK FEEDBACK POWERSUPPLY INPUT-_-I J15/230V SO-1000,-, REGULATED POWERSUPPLY V5-V9 Figure3-1.Model 200TBlockDiagram Sect.IIIPage2 3-2FREQUENCY-CONTROLLINGBRIDGE Thefrequency-c

25、ontrollingcircuitisarrangedas afloatingbridge.symmetricalwithrespectto ground.With noconnectiontogroundonanyter- minalofthebridge.stabilityofcalibrationisas- suredsinceanystraycapacityandleakagetoground presentatthebridgeoutputterminalsdonotshunt eitherthefrequency-oramplitude-controlling armsoftheb

26、ridge.Thefrequency-controlling components(rcnetworkswhicharevariedby operationoftheRANGEswitchandfrequencydial) comprisetwoarmsofthebridge.whiletheampli- tude-stabilizingcomponents(avoltagedivider whichincludesathermally-sensitiveresistance) comprisetheothertwoarms.Theamplitudeis stabilizedatsuchale

27、velthattheamplifiertubes areoperatedinthesubstantiallylinearportion oftheircharacteristics.This.togetherwiththe largenegativefeedbackatharmonicfrequencies, resultsinaverypuresine-waveoscillation. Thebridgeisfed by thebalancedvoltagedeveloped atthecathodesofV2andV4intheoutputofthe balancedamplifier.T

28、heoutput ofthefrequency- controllingbranchofthebridgeisappliedto thegridofV3andtheoutput oftheamplitude- stabilizingbranchisappliedtothegridofVI. Themannerinwhichthevoltage-versus-frequency andphase-versus-frequencycharacteristicsof anrcnetworkcanbeutilizedwithanamplifier ofproperdesigntoachieveanos

29、cillatorwhich deliversvoltageofexcellentstabilityandwave- formiswellcoveredintextssuchasTermang:; RI3I11.;:_ C71,) + It:o-2.Q _.;.,.,.,-:.!.6t.aJfA-ICPfi R36R47 OIL R45 B46 V5 Ii.-:;.JDR.:,.,;:At,In.R53 .ISf;(h.f);JIR52 CI5 I rJR40i .-C16 R41 PRI.WDG TERMS en (l) () M =2 0 ll oq (l) o Figure4-1.Bott

30、omViewModel 200T . 8. (l) - N Model200T 4-1GENERAL TheModel200TPrecisionTelemeterTestOscil- latorisaprecisioninstrumentdesignedcon- servativelyforlongcomponentlife,anditis probablethattubereplacementwillcorrecta majorityofthedifficultieswhichmaydevelop. Tubereplacementinstructionsaregiveninpara- gra

31、ph4-10. Themaintenancedataprovidedinthissection assumesthatmaintenancepersonnelarethoroughly familiarwiththeoperatingproceduresandcircuit theorygiveninSectionIIand III. As aguideintracingthecauseofsubstandardoper- ation,atrouble-shootingchart(Table4-1)is provided.Thetableindicatescausesandreme- dies

32、forcertainspecifictroubles.Wherethe causeofthetroubleisof amoreobscurenature thanthepossibilitiescoveredbythetable,the failureshouldbetracedtothesectionintrouble, andthenlocalizedwithinthesection.General dataonlocalizationproceduresisgiveninpara- graph4-6,TroubleLocalization. Therecurrenceofaspecifi

33、ctroublegenerallyin- dicatesthatprevioustroubleshootinghasremedied theeffectbut notthecause.Andofcoursefor satisfactoryequipmentperformance,troubleclear- ancemustaimatfinding andeliminatingthecause. Afterlocatingthesourceandeliminatingthecause oftrouble,theinstrumentshouldbetestedand adjusted.Ratedp

34、erformancespecificationsare givenatthefrontofthismanual. 4-2OPERATIONALCHECK 1)Turninstrumenton and allow a30minute warm-uptime. 2)SetRANGEswitchtoAX1KandtheFRE- QUENCYdialat5. Sect.IVPage1 SECTIONIV MAINTENANCE 3)Connecta600ohmloadacrosstheoutput terminal. 4)Connectanacvacuumtubevoltmetersuchas Mod

35、el400seriesacrosstheoutputterminal. 5)SetAMPLITUDEcontrolto100(maximum clockwise)andmeasuretheoutputvoltage.The outputvoltageshouldbeatleast10voltsrms. 6)CheckfrequencyresponseofModel200Tusing 5 kcasareference.Thefrequencyresponseshould bewithin1dbovertheentirerangeofthe instrument. 7)ConnectaDistor

36、tionanalyzersuchasModel 330B/C/Dacrosstheoutputterminal.Thedistortion shouldbelessthan0.5%overtheentirefrequency range. 8)CheckFREQUENCYdialcalibration.Referto paragraph4-15,Calibration. 4-3COVERREMOVAL Thebottomplateisremovedbyunscrewingthefour screws,oneineachcornerofthebottomplate, whichfastenthe

37、platetothechassis. Thecoverisremovedbyunscrewingtheeight screwswhichfastenthecovertothebackandtop oftheinstrument. 4-4LUBRICATION,TUNING-CAPACITOR DRIVEMECHANISM Thetuningcapacitordriveassemblyshouldbe oiledonceamonthiftheinstrumentisinconstant use,oreverysixmonthsiftheinstrumenthas onlyoccasionalus

38、e.Beforelubricatingtheinstru- ment,alldustanddirtthathascollectedonthe tuningmechanismshouldberemoved.Thefollow- ingneedlubrication: 1)Vernierdrive-shaftbearing,onedropoflight oilonshaft,ateachendofbearing(seeFigure4-1). en CD () rt . OQ CD tv CI9 CI5 CI6 IV5 TI C20 CI4 C6A C4 C9 ufL.I L4 CI9 3: 8-

39、CD . tv Figure4-2. TopView Model200T 0 0 -3 COMMON . Model200T 2)Idlerpulleybearing,onedropoflightoil on pulleyshaft.Idlerpulleybearingisdirectly belowindicatorlampsocket(seeFigure4-2). 4-5TROUBLESHOOTING Table4-1listsvarioussymptomsoftroubleand foreachindicatesthepartorpartsofthecircuit which shoul

40、d bechecked.Inthemain,forsimpli- fication, onlytubesarereferenced,butitshould berememberedthatcomponentsassociatedwith referencedtubesalsoarefailurepossibilities. Withineachsectionofthetable,checkingshould Sect.IVPage3 beperformedintheordergivensinceitisassumed throughoutaprocedurethatthepartschecke

41、d previouslyarefunctioningcorrectly. WhentestingtheModel 200T,itisrecommended thatlinevoltage beappliedtotheinstrument throughavariabletransformer,andthatthetrans- formerbeadjustedtodeliver105voltstothein- strument.Aninstrumentin good conditionoper- atessatisfactorilyfromanylinevoltage within ratedr

42、ange,butwherethereismarginaloperation (fromweaktubes,etc.)itwill beeasiertotrace atlowlinevoltages. TABLE4-1.TROUBLE SHOOTING Symptom and TestProcedureRemedy PossibleCause 1. INSTRUMENT NOT OPERATING, INDEXWINDOWNOT LIGHTED: a.Fuseopenduetode-Replacefuse.IfnewfuseblOWS,re- fectivefuseorover-moveV5an

43、dreplacefuse. loadinpowersupply Blowing of 2ndfuseindicates: (1)Shortcircuitinwiringassociated(1)Locateandclearshort withTl. (2)Shortcircuitinfilamentwiring.(2)Locateandclearshort (3)DefectivetransformerTl.(3)Replacetransformer No opening of 2ndfusewithV5removed indicates: (1)DefectiverectifierV5.(1

44、)ReplaceV5 (2)InternalshortcircuitinVI,V2,V3(2)Locateandreplacede- orV4.fectivetube. (3)Shortcircuitindcwiring.(3)Locateandclearshort. (4)DefecthTefiltercomponent.DCre- sistancefrompin 8 ofV5toground normallyisapproximately90K;dis- connectlinevoltagebeforemeasuring. b.PoorconnectiontoCheckpowercable

45、,andconnectionsat linevoltage.bothendsofcable. Sect.IVPage4Model200T TABLE4-1.TROUBLESHOOTING Symptomand TestProcedureRemedy PossibleCause 2.INSTRUMENT NOT OPERATING, INDEXWINDOWLIGHTED: a.Powersupplynotoper-ChecklevelofdcvoltageatpowersupplyIfvoltmeterindicationnot atingproperly.output;shouldbe180v

46、olts.Usedcvolt-180volts,refertopara- meter,suchasModel 41OB;connectvolt-graph4-7. meterbetweenpin 8of V6orV7andchassis. b.Defectivetube inoscil-CheckforbadVI,2, 3or4 bysubstitut-Replacedefectivetube. latorcircuit.ingtubesofsametypeknowntobegood.Seeparagraph4-10. c.ShortcircuitintuningTocheckcapacito

47、rsC6A, 6B, 4and5:Ifresistancemeasurements capacitorC6,variable (1)DisconnectModel200Tfromline. indicateshort,beforemak- C4orC9,orfixedca- (2)ConnectoneohmmeterleadtoC6 ingfurtherchecks,visually pacitorC5orC8. terminaldesignatedC6B onFig- examineC5.IfC5isdirty, ure4-2andothertochassis. withairhosegen

48、tlyblow (3)SetRANCEswitchtoAXI00. dustfromplatesandthen (4)Ohmmetershouldindicateapproxi- againmakeresistance mately480K. measurements. TocheckcapacitorsC6C,C8,C9: (1)Connectoneohmmeterleadtopoint onC6designatedCOMMON onFig- ure4-2andothertochassis. (2)With200Tdisconnectedfromline andRANGEswitchon A

49、XI00,ohm- metershouldindicateapproxi- mately1.018M. d.CapacitorC6shortedConnectoneohmmeterleadtoC6termi-Ifresistancemeasurement toground.naldesignatedC6C onFigure4-2andindicatesshort,checkfor othertochassis.defectininsulationbetween C6andinstrumentchassis. With200Tdisconnectedfromlineand RANGEswitchatanysetting,ohmmeter shouldindicateapproximately10K. e.Defectivelamp (RI8,RI9).Seeparagraph4-11. 3. INSTRUMENT OPERATINGPROPERLYONONLYPARTOFTHERANGES: a.Dirty