HP-202B-Manual-sn-1674 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 . INSTRUCTIONMANUALCHANGE FOR MODEL202B Serial1674andabove Thefollowingchangehasbeenma

2、deintheModel202B sincethismanualwasprepared. Serial1674andabove ChangeC19to: Capacitor:fixed,electrolytic, 40f,450vdcw, -hp-no.18-40 Mfr.X,#FP-146 #202B005 RadioFans.CN 收音机爱 好者资料库 INSTRUCTIONANDOPERATINGMANUAL FOR MODEL202B LOWFREQUENCYOSCILLATOR Serial1624andAbove Copyright1955byHewlett-PackardComp

3、any Theinformationcontainedinthisbooklet isintendedfortheoperationandmain- tenanceofHewlett-Packardequipmentand isnottobeusedotherwiseorreproduced withoutthewrittenconsentoftheHewlett- PackardCompany. / HEWLETT-PACKARDCOMPANY 395PAGEMILLROAD,PALOALTO,CALIFORNIA,U.S.A. 202B003 RadioFans.CN 收音机爱 好者资料库

4、 TABLEOFCONTENTS MODEL202B LOWFREQUENCYOSCILLATOR PageNo. GeneralDescriptionFrontispiece Fig.1.Model202BLowFrequency OscillatorFrontispiece Specifications1 Inspection3 CircuitDescription.5 Maintenance7 TableofReplaceableParts TroubleShootingChart SchematicDiagram 9 11 10 14 12 15 Model202B,Bottom.Ch

5、assis View. Model202B,TopChassis View Model202B,ResistorBoard Detail Fig.5.Model202B,RangeSwitch Detail. Fig.4. Fig.3. Fig.2. . cd . H Q) U) GeneralDescription TheModel202BLowFrequencyOscillatorisapractical,easy- to-usemulti-purposeinstrumentforusethroughoutthe0.5to 50,000cpsrange.Ithasthepreciseacc

6、uracyandhighstability associatedwithaudiofrequencymeasurementandhasbroadap- plicabilityforindustrial,fieldandlaboratoryuse.Applications includeelectricalsimulationofmechanicalphenomena,vibration orstabilitycharacteristicsofmechanicalsystems,electro- cardiographandelectro-encephalographperformance,se

7、ismo- graphresponse,vibrationchecksofstructuralcomponents,per- formanceofgeophysicalprospectingequipment,andgeneralaudio measurements. Fig.1.Model202BLowFrequencyOscillator 10 o . - . l!l N o N INSTRUCTIONS MODEL202B LOWFREQUENCYOSCILLATOR SPECIFICATIONS FrequencyRating FrequencyRange: FrequencyDial

8、Calibration: .5to50,000cycles/sec. .5to5 Range:Xl XIO XIOO XIOOO XIO,OOO 0.5to5cps. 5to50cps. 50to500cps. 500to5,000cps. 5,000to50,000cps. . cd . 1-4 U) CalibrationAccuracy:20/0. FrequencyResponse:ldb,5to50,000cps. 2db,0.5to5cps. FrequencyStability:20/0includingwarm-updrift. Lessthanl%frequencychang

9、e forlinevoltagechangesofflO voltsfrom115volts PowerOutputRating PowerOutput:100milliwattsintoratedload(10 voltsacross1000ohmsresistive load). Distortion:Lessthan10/0ofratedoutputfrom 2to50,000cps. Hum:LessthanO.10/0ofratedoutput. LoadImpedance: InternalImpedance: 1000ohms,resistive. 25ohmsat10cps.

10、-1- PowerSupplyRating Voltage: Frequency: Wattage: OverallDitnensions CabinetModel: RackModel: Panel: DepthBehindPanel: Weight CabinetModel: RackModel: l15/Z30volts10%. 501000cps. 95watts. ZO-3/4widex 1Z-l/Zhighx 14-3/4deep. 19widex10-1/Z1highX14-1/41 deep. 19longx10-1/Zhigh. 13-1/4. 43pounds. 36pou

11、nds. -Z- LO LO . o -. - l=Q N o N OPERATINGINSTRUCTIONS INSPECTION Thisinstrumenthasbeenthoroughlytestedandinspectedbefore beingshippedandisreadyforusewhenreceived. Aftertheinstrumentisunpacked,itshouldbecarefullyinspected fordamagereceivedintransit.Ifanyshippingdamageisfound, followtheprocedureoutl

12、inedintheClaimforDamageinShip- mentpageatthebackofthisinstructionbook. CONTROLSANDTERMINALS POWER Thetoggleswitchlocatedonthelowerleftofthecontrol panelcontrolsthepowersuppliedtotheinstrumentfrom thepowerline. FUSE Thefuseholder,locatedonthebackofthechassis,con- tainsa1-1/2amperecartridgefuse.Thefus

13、emaybe replacedbyunscrewingthefuseholdercapandinserting anewfuse. RANGE Thisrotaryswitchinsertsvariousrangeresistorsinthe frequencydeterminingcircuitoftheoscillator.Theposi- tionof.thisswitchindicatesthemultiplyingfactorforthe frequencydialcalibration. FREQUENCYDIAL Thefrequencydialiscalibrateddirec

14、tlyincyclesper secondforthelowestXrange.Itiscontrolledbya directdriveaswellasa6to1vernier. AMPLITUDE Thisvariableresistorcontrolstheamplitudeoftheoscil- latorvoltageadmittedtotheamplifierand,therefore, theoutputvoltageoftheinstrument. LOAD Thistoggleswitchlocatedatthelowerrightofthecon- trolpanelcan

15、beusedtoinserta1,500ohmresistance inparallelwiththeoutputload. -3- OUTPUT Thetwooutputtenninalsarelocatedinthelowerright cornerofthecontrolpanel. POWERCABLE Thepowercableconsistsofthreeconductors.Twoof theseconductorscarrypowertotheinstrumentwhilethe thirdconductor(greenwire)isconnectedtotheinstru-

16、mentchassis.Thethirdwireprojectsfromthecable neartheplugendofthecableandmaybeconnectedtoa groundwhenitisdesirabletohaveagroundedinstrument chassis. OPERATION PlugthepowercableoftheModel202Bintoanominal115volt, 50-1000cyclepowersourceandturnonthepowerswitch.The instrumentwillbegintooperateassoonasthe

17、tubeshaveheated, butformaximumaccuracyawarm-upperiodofabout30minutes isnecessary. SetthefrequencydialandRANGEswitchsothattheirindications, whenmultipliedtogether,equalthedesiredfrequency.Forexam- ple,ifitisdesiredtoselectanoutputfrequencyof2,500cycles persecond,setthefrequencydialto2.5andtheRANGEswi

18、tchto XIK. ConnecttheoscillatorOUTPUTbindingpoststotheequipment beingdrivenandadjusttheAMPLITUDEcontrolforthedesired outputvoltage. RatedloadfortheModel202Bis1000ohms.Itisimportantthat theinstrumentbeworkedintoloadsnogreaterthan1500ohms becauseasubstantialdcvoltagemaybuildupacrosslargeload resistanc

19、e. Ifitisdesiredtoworktheinstrumentintohighimpedanceloads, theLOADswitchatthelowerrightofthefrontpanelshouldbe turnedon.Thisplacesa1500ohmresistoracrosstheoutput terminalssothattheinstrumentseesaloadresistanceconsisting ofthe1500ohmresistorinparallelwiththeexternalload.The LOADswitchcanbeusedwithext

20、ernalloadsaslowas3000ohms togiveacorrectloadfortheinstrument. Usually,itisundesirabletoworktheinstrumentintoloadsless than1000ohmsbecauseanincreaseindistortionwillresult. However,nodamagewillbecausedtotheinstrumentbyworking intolowerloads. -4- ) Astheoutputvoltageoftheaudiooscillatorisreduced,theper

21、- centageofhumvoltagewillincrease.Atthelowerlevelsthishum voltagebecomesquitelarge,relativetothesinewaveoutputvolt- age.Thisundesirableconditioncanberemediedby.operatingthe audiooscillatoratorslightlybelowratedoutputandinsertinga suitableattenuatorbetweentheoscillatorandtheequipmentbeing drivenbythe

22、oscillator.Thevoltagedividercircuitshownbelow issatisfactoryformostapplications. 900ohms MODEL202B OSCILLATOR 100 ohms EQUIPMENT BEING SUPPLIED - ld . J. Q) r.J) N o N Othervaluesofresistancemaybeusedtoobtaindifferentvoltage divisions.Inallcases,thesumofthedividerresistorsshould equaltherateloadof10

23、00ohms. CIRCUITDESCRIPTION TheModel202BLowFrequencyOscillatorconsistsofanoscil- latorsection,anamplifiersection,andapowersupplysection. Theoscillatorsection(tubesVIandV2)isaresistancetunedtype circuit.Basically,thisoscillatorisatwo-stageresistance- coupledamplifierwhichiscausedtooscillatebytheuseofa

24、posi- tivefeedbacknetwork.Thisnetworkisafrequency-selective resistance-capacitancecombinationwhichcontrolsthefrequency ofoscillation. Thefeedbackcircuitisarrangedsothattheoutputofthesecond oscillatortubeisfedthroughthenetworktothegridofthefirst tube.Theentiresystemthusprovidesitsowninputintheproper

25、phaserelationship.FrequenciesotherthanthattowhichtheRC circuitistunedarefedbackoutofphaseforoscillationsothat theoscillationisrestrictedtoonefrequency. -5- Negativefeedbackisusedintheoscillatorsectioninorderto minimizedistortionandtoobtainaveryhighorderofstability. Theamountofnegativefeedbackisdeter

26、minedbyaresistance networkoneelementofwhichisnon-linear,namely,thethree 10wattlampsinthecathodeofV1.Theresistanceofthelamps isafunctionoftheirtemperatureandincreaseswiththecurrent load.Thislampbankcontrolstheamountoffeedbackinaccord- ancewithamplitudeofoscillationand,consequently.maintains theamplit

27、udeofoscillationsubstantiallyconstantoverawidefre- quencyrange.Itisnotablethatthelampshavesufficientthermal inertiatooperatewellevenatlowfrequencies. TheoutputamplifierincludestubesV3andV9.Negativefeedback isusedinthisamplifierinordertominimizedistortionandto provideagoodfrequencyresponse. Thepowers

28、upplysectionincludesaconventionalfull-waverecti- fierwithalow-passpifilter.Thepowertransformeriswired forusewith115voltsupply.Forusewith230voltsupply,the transformerleadsmustbeinterchangedinaccordancewithtrans- formerdetaildrawingonthegeneralschematicdiagram. . cd . !- III:N .A. 25K ffV - :t l- V RB

29、2 I .R48 AA560K , VV, R44 A.33K T YVV 0 0) r;I ID (.) CI8 2.2).lF (OPP.SIDE) 330 15K 560K 10K 56K 33K 560K 10K 56K R38 R36 R37 R34 R35 R53 R50 R32 R51 N o N .q4 Ll) - o - N .-4 Fig.4.Model202B.ResistorBoardDetail -11- TROUBLESHOOTINGCHART Thefollowinginformationisdesignedtobeofassistanceintroublesho

30、otingadefectiveinstrument: I . N I Symptoms InstrumentNOToperat- ing,pilotlightNOTon. PossibleCauses Blownfuse.Maybecausedby defectivefuse,shortedcompo- nentsorotheroverloadon powersupply. Remedies Replacefuse;ifthisfuseblows, removeV4(5Y3-GT)andagain replacethefuse.Ifthisnewfuse blows,itisanindicat

31、ionof: 1.Shortcircuitinfilamentortrans- formerwiring. 2.Tubewithinternalshortcircuit. IfthefusedoesnotblowafterV4is removed,itindicatesa 1.DefectiverectifierV4(5Y3-GT). 2.Shortindirectcurrentwiring. InstrumentNOToperat-IOscillatorsectionnotoperating. ing,pilotlighton. Incorrectdcvoltage.These voltag

32、esshouldagreewith schematicIO%. Amplifiersectionnotoperating properly. ReplaceoscillatortubesV IandV2. Checkforshortcircuitintuning capacitororassociatedtrimmers. Replacecomponentcausingincorrect dcvoltage. CheckdcvoltageonV3andV9.Re- placedefectivecomponent. 202B1/10/55Serial1624andAbove I . VJ I O

33、neormorefrequency bandsinoperative. Intermittentorjumpy output. Instrumentoperating highamountofdistor- tionpresentinoutput. ErraticAMPLITUDE control. Dirtyorbentcontactsonrange switch.Openrangeresistor. ShortintrimmercapacitorC4 orinmaintuningcapacitor. Incorrectdcvoltages,defective regulator. Coup

34、lingcapacitordefective (C8,C9,C18). Defectivenegativefeedback capacitorC19. DefectivevariableresistorR33. Cleanrangeswitch(S1)contactsor replacerangeswitchassemblyifany oftheresistorsisdefective. Useweakairjetorbrushtoclear foreignmatterfromplatesoftuning capacitor. Checkpowersupplyoutputvoltageand

35、outputofregulatedpowersupply. Checkforhighdcvoltageonthegrids ofV2,V3,andV9.Replacethe defectivecapacitor. Checkdcvoltageonpin5ofV3.If morethan+4voltsispresent,remove connectionbetweenC 19andV3.If thisreturnsthevoltageonpin5of V3tonormal,itindicatesthatC19 isdefective. CheckresistancebetweenarmofR28

36、 andgroundforsmoothvariationwith rotationofAMPLITUDEcontrol. ReplaceR28,ifnecessary. R 4R3 C25 R2 RIBRI7 R20Rig GREENTO -PIN4 VI RI6RI5 RI4RI3 TOP I II I :1:t :=$ RIO R6 TO R5 LOCATION ORANGE a:NJNING I . H:- I Fig.5.Model202B,RangeSwitchDetail . 202B1/10/55Serial1624andAbove . SIA1 ,-00- RI+RZS5.7M

37、 RlI.4-RIZ 89.ZM R3+R4.RI3+RI4.SJ5M R5+R6.R15+RI6-aSOK R7+RS.RI7+RIS.aSK R9+RIORI9+R20.a500 ) IOUTPUTI ) 0 a:_ o 0 a:!2 C20-8n.F01lOADI 1/-r:/ ,i9J (f) :; -o 0 CD a: o a: /I CI82.2F -It-.:., , a:, CI9,30!,-F t-T5 a: CD a: CD a: . a:a: a: ii: r-ii: T o liQIf.-SIA,SIB AREGANGED II$) ?1 I2J JQI6 7 + R4

38、4 Q .05!,-F 33K 5(V7 R45 .195 +/50 270K120!,-F R42 47K - BlK.-RED.,111 TIBLACK -i=- (BLACK)TI - PRI.#, 115VI BlK.- YEL. 50-60. L (START)IBlK.-GR. PRI.#2 BLK.-RED (START) BLK.-GR. PRI.#2 230VBlK.- VEL SO-SO,I.-III PRI.#, 33K56K fJ:UNLESS OTHERWISE .-1000OHMS M-IMEGOHM SIB oIRANGEI -ELECTRICALVALUE AD

39、JUSTED ATTHEFACTORY-PART MAY BEOMmm. NOTES CONDITIONS OFDCVOLTAGEMEASUREMENT: I.115/230VOLT,:50601POWERSUPPLY 2.MEASUREMENT TAKEN BETWEEN THE INDICATED POINTS ANDCHASSIS WITH A VOLTMETER OF 122 MEGOHMS INPUT RESSTANCE. 3.SETSlABATXIK,FREQUENCY DIAL ATI,R33ATZERO,S3OPEN. SCHEMATICDIAGRAM SER IAL15498

40、 OFMODEL2028 ABOVE TRANSFORMERDETAil TABLEOFREPLACEABLEPARTS p:j N o N Circuit Ref. Cl C2 C3 C4 C5 C6 C7 C8 C9 CIa Cll C12 C13 C14 CIS C16 Description Capacitor:fixed,ceramic, 100IJ.lJ.f,50/0,500vdcw Capacitor:fixed,ceramic, 100IJ.lJ.f,50/0,500vdcw Capacitor:variable,air, 4 s ections ,12.4IJ.lJ.f=53

41、5IJ.lJ.f persection Capacitor:variable,air, 4sections,12.4IJ.lJ.f-535IJ.lJ.f persection Capacitor:variable,air, 4sections,12.4IJ.lJ.f-535IJ.lJ.f persection Capacitor:variable,air, 4 s ections ,12.4IJ.lJ.f=535IJ.lJ.f persection Capacitor:fixed,mica, Electricalvalueadjustedatthe factory. Capacitor:fix

42、ed,paper 202IJ.f,100/0,400vdcw Capacitor:fixed,electrolytic, 20, 20, 20,20IJ.f,450vdcw Capacitor:fixed,mica Electricalvalueadjustedatthe factory. Thiscircuitreferencenotassigned. Capacitor:fixed,oilfilledpaper, 4 IJ.f,lO%,600vdcw Capacitor:fixed,oilfilledpaper, 4IJ.f,100/0,600vdcw Capacitor:fixed.oi

43、lfilledpaper, 4 IJ.f,100/0.600vdw Capacitor:fixed,eletrolytic, 20IJ.f.450vdcw Capacitor:fixed,paper, .047IJ.f,lO%,600vdcw -hp- StockNo. 15-26 15-26 12-7 12-5 12-7 12-5 16-63 18-42 17-10 17-10 17-10 18-20 16-15 Mfr.*litMfrs. Designation K K W 1261A-4-60G W 890D-4-60 W 1261A-4-60G W 890D-4-60 CC Type8

44、8PS4 X EP-444 P T-64 P T-64 P T-64 X FP-144 CC 73P47396 *SeeListofManufacturersCodeLettersForReplaceablePartsTable.II -15- TABLEOFREPLACEABLEPARTS Circuit Ref. C17 C18 C19 C20 C21 C22 C23,C24 C25 Rl through R20 R21 R22 R23 R24 R25 R26 R27 R28 Description Capacitor:fixed,mica, 1800IJ,lJ,f,100/0,300vd

45、cw Capacitor:fixed,paper, 2.2IJ,f,100/0,400vdcw Capacitor:fixed,electrolytic, 10,10,10IJ,f,450vdcw Capacitor:fixed,electrolytic, 20, 20, 20,20IJ,f,450vdcw Capacitor:fixed,electrolytic, 20, 20, 20,20IJ,f,450vdcw Capacitor:fixed,paper 1IJ,f,20%,400vdcw Thesecircuitreferencesnotassigned. Capacitor:fixe

46、d,ceramic, 22IJ,lJ,f,5%.500vdcw PartofRangeSwitchAssembly Lamp,incandescent 250v.lOW Lamp.incandescent 250v.lOW Lamp,incandescent 250v,lOW Resistor:variable.wirewound. 1000ohms.2W Resistor:fixed,wirewound, 3000ohms.5%.1W Resistor:position. 56,000ohms.10%.1W Resistor:position. 27,000ohms.10%,lW Resis

47、tor:fixed,composition. 130,000ohms,5%.lW -hp- StockNo. 14-47 16-63 18-31 18-42 18-42 16-44 15-2 211-29 211-29 211-29 210-5 26-3000 24-56K 24-27K 24-130K-5 Mfr.*22B-52HP resistorboard.jumper :- 0 Coupling.flexible.self-aligningM25CHP d Coupling.flexible.self-aligningM25GHP ro Shaft.couplerS2494-CRHP

48、N -i:) 3-1/2 . . ro VITube:6SH7212-6SH7ZZ. H U) V2Tube:6v6212-6V6ZZ It) V36SJ7212-6SJ7 It) Tube:ZZ . 0 . V4Tube:5Y3-GT212-5Y3-ZZ . . GT D:l V5Tube:6Y6-G212-6Y6GZZ N 0 N V6Tube:6Y6-G212-6Y6GZZ V7Tube:6SQ7212-6SQ7ZZ V8Tube:VR150212-VR150ZZ MechanicalDriveCables816-3-202BHP Indicator.DialM-64HP *SeeLis

49、tofManufacturersCodeLettersForReplaceablePartsTable. 19- LISTOFMANUFACTURERSCODELETTERS FORREPLACEABLEPARTSTABLE lO I . I N . CodeLetter A B C D E F G H HP I J K L M N o P R S T V X Z AA CC DD EE FF HH II KK LL MM ZZ Manufacturer AerovoxCorp. Allen-BradleyCo. Am.periteCo. Arrow,HartandHegem.an Bussm.anManufacturingCo. Carborundum.Co. Centralab Cinc