HP-204A-Manual-sn-186 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 INSTRUCTIONANDOPERATINGMANUAL FOR MODEL204A AUDIOOSCILLATOR (Portable) Serial186andAbo

2、ve HEWLETT-PACKARDCOMPANY 395PAGEMILLROAD,PALOALTO.CALIFORNIA.U.S.A. RadioFans.CN 收音机爱 好者资料库 GeneralDescription TheModel204AAudioOscillatorisacompact, instrumentwithaself-containedbatterypowersupply. splashproofmetalcase. hghtweight,precision Itisenclosedbyasturdy, Thisoscillator,whichhasarangeoffro

3、m2to20,000cycles/sec.,is veryusefulforcheckingtelephoneorremotebroadcastlines,laboratoryuse whereacompletelyhum-freeaudiovoltageisdesired,andforgeophysicaluse. PartsSubstitutions Difficultiesinprocuringsomeofthepartsusedinthisinstrumentmay causetheelectricalorphysicalvaluestodeviatefromthoseshownint

4、hisin- sructionmanual.Thesesubstitutionshavebeenmadesoasnottoimpairthe performanceofthisinstrument.Wheneverreplacementofanyoftheseparts isnecessary,eitherthesubshtutevalueortheoriginalvaluemaybeused. CAUTION Inordertoobtainmaximumusefullifefromthebatteriesinthisinstru- ment,alwaysturnoffthePOWERswit

5、chwhentheinstrumentisnotinuse. en (l) I-t . III . - 00 0 T o RadioFans.CN 收音机爱 好者资料库 2to20cycles/sec. 20to200cycles/sec. 200to2000cycles/sec. 2000to20,000cycles/sec. o . . cd ; H U) INSTRUCTIONS MODEL204A AUDIOOSCILLATOR (Portable) Specifications FrequencyRating- FrequencyRange- 2to20,000cycles/sec.

6、 DialCalibration- 2to20 Ranges- Xl XI0 XI00 XI000 CalibrationAccuracy-2% FrequencyResponse- 1dbfrom2to20,000cycles/sec. FrequencyStability-Within3%includingcalibrationerror,normaltube aging,andnormalbatteryaging.Agingofbatteriescausesnotmore than1%changeinfrequency. OutputRating- RatedOutput- 5volts

7、acrossala,000ohmsresistiveload Distortion-Lessthan1%,10to20,000cycles/sec. Lessthan2%below10cycles/sec. RatedLoadImpedance-la,000ohms,resistive PowerSource(SelfContained)- Filament- 5BurgessNo.2(orequivalent)flashlightbatteries(1-1/2 voltseach) Plate- 3BurgessNo.5308(orequivalent)batteries(45voltsea

8、ch) BatteryLife-60hourstotalwhenusedattherateof4hoursdaily. oerallDimensions 10-1/2 11 highX10-1/2 11 widex11deep Weight Approximately25Ibsincludingbatteries. -1- OperatingInstructions Inspechon- Thismstrumenthasbeethoroughlytestedandinspectedbeforebeing shIppedandISreadyforusewhenreceIved. Afterthe

9、instrumentisunpacked,itshouldbeinspectedfordamagere- ceivedintransit.Ifanyshippmgdamageisfound,followtheprocedureoutlined intheIIClaimforDamagemShipmentllpageatthebackoftheinstructionbook. ControlsandTermInals- AMPLITUDE-ThiscontrolisavariablevoltagedivIderwhichisusedto controltheamountofoscillatorv

10、oltageapplIedtotheinputoftheamplifiersec- hoand,therefore,theamplitudeoftheoutputvoltage.Theoutputvoltagein- creasesasthecontrolISrotatedclockwIse.Thiscontroliscalibratedfrom 11011to1110011InarbItraryunits. FREQ.RANGE-Thisrotaryswitchchangesresistancevaluesinthe frequencydeermmingsectionsoftheinstru

11、ment.Thepositionofthisswitch determInesthemultiplyingfactorthatmustbeusedtoconvertthefrequency dIalmdicatiototheactualoutputfrequencyoftheinstrument. FREQUENCY-ThISconrolvariesthecapacityinthefrequencydeter- minigcircuItsoftheinstrument. Thefrequencydialiscalibratedfrom2to20anditsindicationmultiplie

12、d bhefactormdicatedbytheposihonoftheFREQ.RANGEswitchwillgivethe acualouputfrequencyoftheoscillaor. POWER-Thisrotaryswitchcontrolsthepowersuppliedtotheinstru- menfromthebateries.WhentheswitchisintheOFFposition,thetwofHa- metlrcultsandhetwohighvoltageWIresfromthebatteriesareopened.When heInsrumentIStu

13、redon,heneonlamponthecontrolpanelwIllflashperiodi- cally. OUTPUT-Thetwobindingposts,locatedinthelowerleftcornerofthe controlpanel.aretheouputterminalsoftheoscillator.Thebindingpostmarked Gisonneced0theinsrumechassisandcase. Operation- TheprocedureforoperatingtheModel204AAudioOscillatorisasfollows: -

14、2- . 00 0 . o o . 1.Releasethelatchesoneithersideofthecasecoverandremovethe cover. 2.onnecttheequipmentundertesttotheOUTPUTbindingposts.Use theratedloadimpedanceforbestresults.* 3.SettheFREQUENCYdialandFREQ.RANGEswitchsothattheirin- dications,whenmultipliedtogether,equalthedesiredfrequency.Forexampl

15、e, ifafrequencyof700cycles/sec.isdesired,settheFREQUENCYdialto7and theFREQ.RANGEswitchtoX100. 4.TurnthePOWERswitchtoONandadjusttheAMPLITUDEcontrolfor thedesiredoutputvoltage. *Althoughtheratedloadimpedanceforthisinstrumentisla,000ohms (resistive),higherorlowerimpedanceloadsmaybeusedwithoutdamagetoth

16、e instrument.Loadimpedanceshigherthanthespecifiedloadimpedancewillre- sultinlowerpoweroutput.Lowerloadimpedanceswillincreasethepercentage ofdistortionintheoutputvoltage. Informationonwhenandhowtoreplacebatterieswillbefoundinthe MaintenanceSectionofthisbook. -3- CircuitDescription TheModel204AAudioOs

17、cillatorconsistsofanoscillatorsection,an isolahgamplifier,anddrybateriestosupplythefllamentandplatevoltages. TheoscillaorsectionconsistsoftubesVIandV2whichareconnected toformatwostageresisancecoupledamplifier.Twofeedbackcircuitsare connectedaroundhisamplifier-apositivefeedbackcircuittoproduceoscilla

18、- tiosandaegatiefeedbackcircuittominimizedistortionandmaintainconstant ampliudeofoscillaion. Theposrvefeedbackcircuicotainsafixedresistance(Rl-R8)and variablecapaciynework(CI-C4).Osc1llationsareproducedwhenthereis zerophaseSh1fthroughthisfeedbacknetworkandtheoscillatorfrequencyis determinedbythecirc

19、uitconstansofh1Snework. Theegahvefeedbaketworkintheoscillatorsectionminimizschanges inosc1llatoramplitudew1thchagesinfrequency.Th1sneworkiscomposedof R12,RI7,adRILRllisa 3waincandescentlamp.Thislamphasatem- perature-resistancecharacteristicsuchthatitsresistancewillincreaseindirect proportiontohevolt

20、ageapplied0it.Changes10theresistanceofthislamp w1llchangehepercentageofnegativefeedbackintheoscillatorcircuit.Whe heOS(11latorvolagerisesmorevolage1Sappliedtothelamp(RIl).thin creasedvoltagew1lraiseheemperatureandresistanceofhelampwhichin urnincreasesheprcentagefnegaiefeedbackintheoscillatocircuit.I

21、n- crasigthepercenagefegahvefeedbackwilltend0decreaseheoscillaor outputvoltagetoi.snormaoperaigpoint.Theactionwillbreversdifthe oscBatoroupuvoltagedecreases,theegativefeedbackvoltagewilldecrease lowerlng.hevoltageacrosshelamp(RIl)whichwillloweritsreSIstancethus lowerghepeenageofngattvefeedbackandten

22、dig0raiseheoscillator ouputto1tSnormaloperaiugpon.Thehermalinertiaofthelam.p1Sgea enoughsothatitsresisancewillnovaryinaccordancewiththesinewae voltageathelowestfrequencl.esivoled. TheIsolatigamplifier(ubeV3)prevetstheoscillatorfom.being affecedbyheexeralload.Aegaivefeedbackcircuitwhichispartofthe am

23、plifier,reducesanydistortioncausedbyheamplifier. -4- n.Theplatebatteriessnould.beat least135voltsunderloadandthefilamentbatteriesatleast1-1/2voltswhen loaded.Ifthebatteryvoltagesarenormal,thenreplacetheinstrumentinthe case. -5- TubeReplacement- TubesV2andV3maybereplacedwithanytubehavingnormalcharact

24、er- istics.TubeVIismorecriticalbecauseitoperates(lowestfrequencyrange only)withanextremelyhighresistanceinitsgrIdcircuit.Therefore,ifthere- placemetfortubeVIhasgascurrent,thefrequencycalibrationofthelowest fequencyrangewillshiftduetothegascurrentflowingthroughthegridresistor. ReplacemenofLampRll- Th

25、islampoperatesfarbelowitsratedpowerconsumptionandshould haveainfimtelife.However,shouldthelampfailitwillbenecessarytoread- justresistorR12aferthereplacementlampisinstalled. Installthereplacementlampandmeasuretheoscillatorvoltagebetween hejuncboofC9andR19,andthechassis.Thisvoltagemustbebetween9and 11

26、volts(RMS)wIthheosillatorsetat1000cycles/sec.Ifthisvoltageisnot WithlhespeIfiedrange,thenadjustR12sothatthecorrectvoltageisobtained. LubrlaionofTuningCapaciorDrlveMechamsm ThetuIngcapacitordrivemechanIsmshouldbelubricatedonceayear. Putonedropofhghtoil(#10)ineachofthethreeoilholesinthetuningcapacitor

27、 drivecasig(SeeFig.3).Donotlubricatethegearteethorthebearingsinthe capator. yCahbraion- hefrequencycalibralonhas(exceptwhenduetoagassytubeVI) c;ifted,thenhefollowingprocedureshouldbeusedtorestorethecalibration. Avacuumtubevolttneter,anoscilloscope,andasourceofaccuratefre- quencyvolagetocoverthe200to

28、2,000cycles/sec.rangearenecessaryfor ahbratingthlinstrumen. 1.Unscrewthecapivesrewsandremoveheinstrumenfromthecase. 2.RotatetheFREQUENCYdialcounterclockwiseuntilitstops.The smalldobeyondthehighfrequencyendofthedialscaleshouldhencoincidewith thedexlinonthewlndow. 3.Ifthedotdoesnotcoincide,removethekn

29、objustbelowthediales- cutcheon.Loosenthefourscrewsonthedialhubandrotatethedial,whilehold- ighhubagamshesop,untilhedotcoincideswiththeindex.Tlghtenthe crews. -6- . ll . . 00 0 . o 4.Connectthesourceofstandardfrequenciestothehorizontalinputter- minalsoftheoscilloscope.Theverticalinputterminalsoftheosc

30、illoscope, hevacuumtubevoltmeter,andtheratedloadareconnectedtotheOUTPUT terminalsoftheoscillator. 5.SettheoscillatorFREQUENCYdialtothestopdot,theFREQ. RANGEswitchtoXIOO,andtheAMPLITUDEcontrolnearmaximum.Turnon theoscillatorandmeasureitsfrequency(withtheInstrumentinthecase)by meansoftheLissajousfigur

31、esontheoscilloscopescreen.Thefrequency shouldbe2400cycles. 6.Ifthefrequencyiscorrect(2400cycles/sec.)proceedtothenextstep. Ifnotcorrect,thenadjustClandC3(SeeFig.2)simultaneously,withanon- metallicscrewdriver,untilafrequencyof2400cycles/sec.isobtained.The instrumentmustalwaysbeputbackintothecaseforfr

32、equencychecking. 7.NowsettheFREQUENCYdialtoexactly20.Donotchangethe FREQ.RANGEcontrol.AdjusttheAMPLITUDEcontrolshghtlysoastoobtain asatisfactoryindicationonthevoltmeter.Thisvoltageshouldbenotedand usedasareferencelevelforflatteningtheoscillatorresponse. 8.SettheFREQUENCYdialtoexactly2andcomparetheos

33、cillator frequenywiththefrequencystandard.Alsonotetheoutputvoltage.Ifthe frequencyisnot200cycles/sec.andtheoutputvoltageisnotthesameasIt wasat20,thenadjustClandC3simultaneouslytoobtainthecorrectfrequency andoltage. 9.Returnto20andre-adjustC 1andC3forthecorrectfrequencyand referencelevel. 10.Repeatst

34、eps8and9.Theoscillatorfrequencycalibrationandres- ponseshouldnowbecorrect.Ifthefrequencycalibrationisnotcorrectonthe otherranges,thentheinstrumentshouldbereturnedtothefactorywherethe calibraionwill.becorrectedforanominalcharge.SeetheWarrantySheetin hebackofthisinstructionbookconcerningproperpackinga

35、ndshippinginstruc- ions. -7- Troubl ThefolloW1Uglnformabon)sdesignedtoaidintroubl(hootingadefecbveinstrument: SymptomPossibleCauseTestprocedureRemedies InstrumentnotopeI-Exhaustedbatteries. atmg,indicatorlamp notflashing. Removetheinstrumentfromthe aseandmeasurethevoltageof allbattertes.RefertotheBa

36、t- teryReplacementsectionfor voltagerequirements. Replacebatteriesifvol.tages aretoolow. f 00 I Instrumentnotoper- ating,indicator lampflashing. OscIllatorsectIon notoperatingpro- perly. Measuretheoscillatorvoltag aslndicatedontheschematl dIagram.Ifoscillatorvoltage isnotpresent,thenproceed asfollow

37、s: 1.ChecktoseeiftubesVI orV2aredefective. 2.Ifthetubesarenormal, measuretheDCvoltagesin theoscillatorcircuit.These voltagesshouldagreewiththe voltagesmdicatedonthesche- maticdiagramwithin100/0and withallowanceforthelower voltageduetopartiallyex- haustedbatteries. 3.Shortcircuitintuning capacitorC2o

38、rassociated trimmercapacitorsCl,C3. 1.ReplacetubesVIand/or V2.SeeTubeReplacement section. 2.ReplaceClrcuitcomponent causingtheincorrectDCvolt- age. 3.Clearshortcircuit.If foreignmaterialisshortcit- cuitingthecapacitor,remove carefullysoasnottobendthe plates.Ifplateshavebeenbent sotheyaretouching,car

39、efully straightentheplates. o9BTpnoIdSfS/Z/TVtOz 204A1/2/53Serial18 220K 2 22 4=3 C8 I .25F 4= R20 CIO 5- CI2 OOQ) !XiI I f923220K .25F20F I +/2.5 -3 +1/2.5 6lAJ 1/ -,66 RI9 -.66 -1/ C3I 61: 25K 67 1 I 7 25 I I7 R5k I iJC2 RI3RI5RIGRI8 R21 R24 R8R7R6 V 470K150K 1M 4700 IAMPLITUDEI 1M4700 84.5K845K8.

40、45M C6 84.5M .5F L- - - R25 IDUTPlOOK 8T4 BT5 1.5VI 1.5V I -It-/o;-2 SIB SIC L-os;y, RII( 3W CII 50F I 0 R9-82 * II IFREQ.RANGEl RIO -= ISO R22 :S2Aa528 CS-SOF22K AREGANGEO) oPOWER .-P ON2 2 SIA,SIB,SIC,SSIOAREGANGED SIA -NOTES- f1/2.5CONDITIONSOFDCVOLTAGEMEASUREMENT: K 1000OHMS. RI4 I.FRESHBATTERIE

41、S IN INSTRUMENT. MI MEGOHM. , I 1/2.2M YI4 11111f-l111 2!AMPLITUDEIATZERO*.ADJUSTEDATFACTORYFOROPTIMUM SCHEMATICDIAGRAM SERIAL186a OFMODEL204A ABOVE Fig.1.Model204AAudioOscillator _. RI2 Fi:o.2.Model204ATopViewCaseRemoved Fig.3.Model204ARearViewCaseRemoved CAPTIVESCREWS WHICH FASTEN- PANELTOCASE. Fig.4.ModelZ04AB ottOITlViewB ottOITlPlateandCaseReITloved t1l2.5V RED WIRE tl35V WHITE WIRE o I I I u. ,:L uo . . u. eli l!l w a: 2 -.;tralrryjnslrtlmrn/rJpffJami:J,furflCY 395PAGEMILLROADv.!.pPALOALTO,CALIFORNIA