HP-204B-Manual-sn-416 电路图.pdf

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1、HPArchive This vintage Hewlett Packard document was preserved and distributed by Please visituson the web! Thanks to on-line curator: Kenneth Kuhn for supplying and scanning this vintage document. RadioFans.CN 收音机爱 好者资料库 01369-4 OPERATINGANDSERVICEMANUAL MODEL2048 SERIALSPREFIXED:416- OSCILLATOR Pri

2、nted:JUHE1964 RadioFans.CN 收音机爱 好者资料库 Mode1204B 01369-1 SECTIONIGENERALINFORMATION SECTIONIIINSTALLATION SECTIONIIIOPERATION SECTIONIVPRINCIPLESOFOPERATION SECTIONVMAINTENANCE SECTIONVIREPLACEABLEPARTS Index Iii RadioFans.CN 收音机爱 好者资料库 Model 204BTableofContents ListofIllustrations ListofTables TAau0

3、CONTENTS SecUon V (Contd) VIREPLACEABLEPARTS. 6-1,Introduction. . 6-2.OrderingInformation SectionPage IGENERAL INFORMATION.-1 1-1.Introduction. .-1 1-4.PowerSupply. -1 1-6.MercuryandRechargeableBatteries1- 1-8.AccessoriesAvailable1- 1-10.InstrumentIdentification-1 UINSTALLATION2-1 2-1.Inspection.2-1

4、 2-4.Rack/BenchInstructions2- 2-6.CombiningCase.2_ 2-8.AdapterFrame.2- 2-10.Battery-PoweredOscillators2- 2-12.AC-PoweredOscillators2-1 2-16.RepackaginglorShipment.2-2 10OPERATION.3-1 3-1.Introduction.3-1 3-3.Procedure. 3_1 3-5.GeneralOperatingConsiderations3-1 3-10.OperationWithRechargeable Batterie

5、s3-. 3-16.RechargingNickel-Cadmiwn Batteries.3-2 3-20.Cycle-LifeofNickel-Cadmium Batteries. .3-2 3-26.MercuryBatteryReplacement.3-2 V PRINCIPLESOFOPERATION.4- 4-1.Introduction4- 4-7.OscillatorCircuit4- 4-13.PeakDetector4-2 VMAINTENANCE 5-1 5-1.Introduction5-1 5-3.RequiredTestEquipment 5-1 5-5. 5-7.

6、-8. 5-9. 5-10. 5_12. 5-14. 5-16. 5-18. 5-19. 5-23. 5-26, 5-28. 5-29. 5-3l. 5-32. 5-34. 5-36. 5-38. 5-40. 5-42. 5-45. PerformanceChecks. DialAccuracyCheck FrequencyResponseand OutputVoltageCheck. DistortionCheck Repair. CoverRemoval. ServicingEtchedCircuitBoards. Troubleshooting. AdjustmentandCaUbrat

7、ion ACPowerSupplyChecks. BatteryChargerCurrent Adjustment. DCB:41.Adjustment DistortlonCheck. FrequencyCalibration Adjustments ReplacementProcedures. CamCableReplacement FrequencyPotentiometer Replacement. Range SwitchAssembly Replacement Battery-PackPowerSupply. ACPowerSupply. RechargeableBatteryPo

8、wer Supply . . ReplacementofRechargeable Batteries. . Page 5-1 5-1 5-2 5-2 5-3 5-3 5-3 5-4 5-4 5-4 54 5-5 5-5 5-5 5-6 5-6 5-6 5-7 5-6 5-8 5-8 58 6- 6- 6- PageNumber Page 1-05-3.CoverRemoval. . .5-3 2-05-4.Model 204B, Exploded View .5-4 5-5.CamsandCableRelationship.5-6 2-05-6.RangeSwitchDetail.57 2-1

9、5-7.RearViewofBattery-Powered 2-2Model 204B.5-8 5-8.ACPowerSupplyInstallation.5-8 3-05-9.RearInternalViewofRechargeable BatteryPowerSupply. 5-10 32510.OscillatorandAmpUflerwithBattery 4-PackPowerSupply. 5-11 4-2 5-11.Option 02PowerSupplywith 4-2 RechargeableBatteries. 5-12 5-15-12.Option01ACPowerSup

10、ply. 5-13 LISTOILLUSTRATIONS Number 1-1.Model 204BOscUlator. 2-1.CombiningCase. 2-2.StepstoPlaceInstrumentInto CombiningCase. . . . . . . . 2-3.AdapterFrameInstrumentCombinations 2-4.TwoSubmoduleUnitsinRackAdapter. 3-1.FrontPanelControls,Connectors andOperatingInstructions. 3-2.RearView of Model 204

11、B Showing MercuryBatteriesInstalled. 4-1.BlockDiagram. 4-2.SimplifiedSchematicDiagram. 4-3.RCNetworkCharacteristics. 5-1.TestSetupforDialAccuracyor DistortionChecks. 5-2.TestSetupforFrequencyResponse andOutputVoltageCheck. . . 5-2 LIST0TAlLIS Number 1-1.Speciflcations. 51.RequiredTestEquipment 5-2.D

12、ialAccuracy. ., Page .-. .5-1 .5-2 Number 5-3.TroubleshootingSummary 6-1.Index byReferenceDesignator 6-2,ReplaceableParts., Page 5-5 6-2 6-5 v Model204B SECTION I GENERALINFORMATION Section I Paragraphs1-1to1-11 1-1.INTRODUCTION. 1-2.TheModel 204BOscillator(f1gure1-1)isa transistorizedbattery-powere

13、dinstrumentwhichpro- duces sine_wavesignalsinthe5-cpsto560_kcrange. Theoutputis10milliwattsinto 600ohmsandiscon- tinuouslyadjustableoveratleasta40-dbrange.Into theratedload of 600ohms,frequencyresponseis within3%,Theoscillatoroutputisfloating,isolated frompowerline ground andinstrumentchassis. 1-3.T

14、he800-ohmoutputimpedanceoftheoscillator makesitcompatible withtransmissionlinesand many distributionsystems.Whenbattery-powered,the oscillatorisuseful forisolatedapplications.The Model403A/BACVoltmeter.alsobattery-powered, makesan ideal companioninstrumentfortheModel 204B. 14,POWERSUPPLY. 1-5.Normal

15、lytheoscillatoris equipped with abat- terypackwhichconsistsof four 6. 75-voltmercury batteries.IfoperationfromACisdesired,anAC power supply (Option1)ora power supply withre- chargeablebatteries(Option2)maybeused.Both ofthesepowersuppliesoperatefrom115or230 volts, andareinkitformfor fieldinstallation

16、.Thebattery packisalsoin kitform.AUthreetypesof power suppl1es mountinthesamelocationintheinstrument and can beeasilyinterchangedinthefield. 1-6.MERCURYANDRECHARGEABLE BATTERIES. 1-7.MercurybatteriesusedintheBatteryPackare ventedtopreventexcessiveinternalpressuresfrom developing.Thenickel cadmiumbat

17、teriesareseal- edbutpresentnoproblemifproperlyused(seeSection III).ThefollOWingprecautionsshouldbefollowedior eithertype ofbattery: a.DONOTshortcircuiteithertype ofbattery. b.Disposeofbatteriespromptly whentheyhave exhaustedorwill notoperateequipment upto specifications. c.Neverdisposeofbatteriesbyf

18、ire. d.Turnoffbatterypowered equipment when not inuse. e.Storebatteriesina coolwell-ventilatedplace. 1-8.OPTIONSAVAILABLE. 1-9.Thefollowingthreepower suppUesareavail- ableinkitformforfieldinstallation: BatteryPackPowerSupply - 204B-64B ACOperatedPowerSupply -204B-llA RechargeableBatteryPowerSupply.2

19、04B-llC 110.INSTRUMENTIDENTIFICATION, 1-11.Hewlett-Packardusedatwosection,eight- digitserialnumber(000-00000).Ifthefirstthree digitsoftheserialnumberonyourinstrumentdo not agreewiththoseonthetitlepageofthismanual, changesheetssupplied withthemanual will define differencesbetween yourinstrumentandthe

20、Model 204Bdescribedinthismanual. TableI-I.Specifications FREQUENCY RANGE: 5 cpsto560 kc in 5ranges. verniercontrol DIAL ACCURACY:3% FREQUENCY RESPONSE:3%.withratedload OUTPUT IMPEDANCE: 600ohms OUTPUT:10milliwatts(2. 5vrms)into600ohms, 5vrmsopenclrcuit,completely floating OUTPUT CONTROL: Continuousl

21、yvariablebridged TOOattenuatorwith atleast40-dbrange 01369-4 DISTORTION:Lessthan1% NOISE:Lessthan0.05%.acorbatteryoperated POWER SOURCE: 4batteriesat8.75volts each, 7-madrain,Ufe atleast300hours. DIMENSIONS: Module6-3/32In. high,5-1/8in. wide,8in.deep NET WEIGHT:6lb EQUIPMENTAVAlLABLE:204B-llA.ACSup

22、ply Kit for fieldinstallation,204B-llCRecharge- ableBatterySupply Kitforfieldinstallation, 2048-64B.Battery Kit for field installation. 1-1 Model204B 2-1.INSPECTION. SECTION II INSTALLATION SectionII Paragraphs2-1to2-14 2-2.Unpack theinstrumentuponreceiptandinspect itforsignsofphysicaldamagesuchassc

23、ratched surfaces,brokenknobs.etc.Ifdamageisapparent, proceedasdescribedintheClaimforDamage in Shipmentsectionofthewarrantyintherearofthis manual. 2-3.Anelectricalinspection shouldbeperformed assoonaspossibleafterreceipt;seeparagraph5-5 forperformancechecks.Thesearegoodtestproce- duresforincoming qua

24、l1ty-controlinspection. 2-4.RACK/BENCHINSTRUCTIONS. 2-5.TheMode1204B1sshipped withplasticfeetand atiltstandattached.readyforuseasabench-type instrument.ToadapttheModel204Bforrackmount- ing,removetheplasticfeet identified in figure 5-3 by following theproceduregiven inparagraph5-13(c). 2-6.COMBIN1NGC

25、ASE. 2-7.Thecombiningcaseshowninfigure2-1isa full-moduleunit whichacceptsvaryingcombinations of submodule unitssuchastheModel 204B.Being a full-moduleunit,thecombiningcasecanbeusedas a bench modeloritcanberackmounted.Instructions foruseofthecombiningcasearegiven graphicaUy in figure2-ZforliZ-moduleu

26、nits.TheModel 204Bis a1/3-moduleWlit.thereforeitisnecessarytouse eithertherightorleftdividerlatchwheninstalling thedividerassembly. 2-8.ADAPTER FRAME. 2-9.Theadapterframeissimplyarackframethat acceptsany combinationofsubmoduleunits(seefig- ure2-3);itcan onlyberackmounted.Instructions areasfollows: a

27、.Placeadapterframeverticallyon edge of bench asshown instep1flgure2-4. b.Stacksubmoduleunitsinframeasshown instep 2 .Placespacerclampbetweenunits,step3 c.Placetwo endspacerclampsasshown instep 4 and push submoduleunitsintoframe. d.Insertscrewsoneithersideofframe,step5 and tightenuntil8ubmodule Wlits

28、aretightin frame. e.ThecompleteassemblyIsnowreadyforrack mounting. 01369-3 2-10.BATTERY-POWEREDOSCILLATORS. 2-11.Powerforbatterypoweredoscillatorsissup- pliedfromfour6.7:i-voltMallorymercurybatterles. Therearenospecialinstallationinstructionsfor placingbattery-poweredoscillatorsintooperation. Toconv

29、ertforoperationfromanacpower supplyor arechargeablebatterypowersupply.refertopara- graph5-35. 2-12.AC-POWEREDOSCILLATORS. 2-13.POWER REQUIREMENTS,WhentheModel 2048hasanacpowersupplyortherechargeable batterypowersupply. asourceof115or230volts :1:10%.50toIWOcpswtIlberequired.Whenthe sourceis115volts.s

30、ettheswitch.located onthe rearpanel,sothat thenumber115appears.Ifa 230-voltsourceisused,placethe switchsothatthe number230appears. 2-14.POWER CABLE.Fortheprotectionofopera- tingpersonnel,theNationalElectricalManufacturers Association(NEMA)recommendsthattheinstrument panelandcabinetbegroWlded when be

31、ingoperated fromanacpowerline.Instrumentswiththeacpower supplyorrechargeablebatterypower supplyare equipped with adetachable.three-conductorpower cablewhich, when pluggedintoanappropriaterecep- tacle,groundstheinstrument.Theoffset pin onthe powercablethree-prongconnectoristhe ground pin. FILLERPANEL

32、 iI , I (0 I ( 0 0I ( 10 I ( 10 Ie 10 0 I .!_,_uI Figure2-3.AdapterFrameInstrument Combinations 2-1 SectionII Paragraphs2-15to2-17 2-15.Topreservetheprotectionfeaturewhenoper- atingtheinstrumentfromatwo-contactoutlet.usea three-prongtotwo-prongadapterandcannectthe pigtailOntheadaptertogrOWld. 2-16.R

33、EPACKINGFORSHIPMENT. Model 2045 CD ADAPTER FRAME 2-17.ThefollowingIsageneralguideforrepack- aginganinstrumentforshipment.Ifyouhaveany questions.contactyourlocal19salesofficeorrepair facility.Proceedasfollows: a.PlaceinstrumentlnoriginalcontainerUavai- able.Iforlglnaicontainerisnotavailable,itcanbe p

34、urchasedfromyournearestHewlett-PackardSales andServiceOffice(refertomapsin Appendix). b.Iforiginalcontainerisnotused.rapinstru- ment in heavypaperorplasUcbeforeplacingin innercontainer. c.Useaheavycartonorwooden box tohousethe instrumentandinnercontainerandusestrongtapeor metalbandstosealtheshipping

35、container. =- o o 4 .- liZMOOULE INSTRUMENT d.MarkshippingcontainerwithDelicateInstru- ment,Fragile,etc.asappropriate. Note Ifinstrumentisto beshippedtoHewlett- Packardorserviceorrepair,atrachatag toInstrumentIdentifyingowner,model number,serialnumber,andindicating serviceorrepairto beperformed.In a

36、ny correspondenceidentifyinstrumentby modelnumberandserialnumber,and serialnumberprefix. 2-2 . - SPACER CLAMP RETAINING SCREWS Figure2-4.TwoSubmoduleUnits inRackAdapter 01369-3 SectionIJ Figure3-1 Model 2048 Controls and COlUlectors 1.Forselectingfrequencyrange.InOFFposition osclllatorisinoperative.

37、 2.Onindicator;glows inallpositions of RANGE switch exceptOFF. 3.Forselectingfrequency withindesiredrange. DialcalibrationmultipliedbyRANGEswitch positiongivesoutput frequency incyclesper second. 4.Providesfine frequencyadjustment.Dialis calibratedwitharrowin verUcal position. 5.Forselectingdesiredo

38、utput level(10mwmax- imuminto 600 ohms). 6. Outputterminals,floating; impedance, 600 O. 7.iscabinetgroW1dterminal. Operation a.Connect loadtoOUTPUT600Q(6)terminals. b.Selectfrequency withRANGE(1)and FREQ. (3).Example:IfFREQ.issetto20and RANGE to XIK.theoscillatorsoutputfre- quency1s20kc(20cpsxlK=20k

39、c). c. Set AMPLITUDE(5)fordesiredpower level. Note IfoscUlatoriseqtdpped withACPowerSup- plyorRechargeableBatteryPowerSupply, turningRANGEswitchtoOFFdoes notturn ACPowerSupplyorBatteryChargeroff. D1sconnect powercordtolurneitherofthese twopowersuppliesoff. Figure3-1.FrontPanelControls,Connectors,and

40、 OperalingInstructions 3-0 Model 2048 SECTIONIII OPERATION SectionIII paragraphs3-1 to3-15 31.INTRODUCTION. 3-2.The Model 204B has fouroperatingcontrolsand one outputconnector(seefigure3-1).A sinewave signal in the5-cpsto 560-kc rangeisselectedby positioning the FREQ.RANGE, and VERNIER con- trols.Ou

41、tput power leveliscontrolledbythe AMPLITUDEcontrolwhich hasatleasta 40-dbrange. A 115/230 volt switchison therearpanelwhenoscl- llalorsareequipped withanacpower supplyorre- chargeablebatterypower supply. 3-3.PROCEDURE. 3-4.OperatinginstructionsfortheModel 204Bare given in figure3-1. 3-S.GENERALOPERA

42、TING CONSIDERATlONS. 3-6,Topreventdamage totransistorsin theoscil lator, a blockingcapacitorshould beusedinseries with the output when connecting to a loadacrosswhich thereisa dc potentialdifference.When thecapacitor Is used, Initialcurrentsurgemustbelimitedto a capacitance-voltage productlessthan 2

43、00microfarad- volts.Forexample, if a 20-voH potentialdifference existsacrossthp.load,usea10-j.I.fcapacitor(lOj.l.fx 20v=200j.l.fv). CAUTION DONOTCONNECT THEOSCILLATOR ACROSSLOADSWHICHAREREFERENCED OFFGROUND(.)BYMORETHAN25 VOLTS;H1GHERVOLTAGESWILL BREAK DOWNCOMPONENT INSULATION. 3-7,When the Model 20

44、48 isinitiallyturnedonand RANGEswitchissettoXl,allow20secondsforos- cillatortostabilize;only a fewsecondsarenecessary forstabilizationwhen SWitching tootherRANGEpo- sltions.1f FREQ. dialissweptattoofastarate,out- put voltage fluctuations willoccur(Since a wlrewound resistorisusedasthevariablefrequen

45、cydetermining element).Ifsweepspeedisdecreasedorsweepingis stopped,oscillatoroutputwillstabilizeatitsnormal leveL 3-8,To obtain maximum amplitudestabilityfrom battery-poweredosCillators,wait20minutesafter turn-onlopermitthebatteryvoltagetostabilize.This effect maycauseasmuchasa1%change in amplitude

46、during thefirst20minutesof operation. 3-9.Whenoperatingfrombatteries(Mercuryor Nickel-Cadmium) thebatteriesrequirereplacementor recharging (Nickel-Cadmiumbatteriesonly)when maximumoscillatoroutputbecomeslessthan 5. 0 volts rmS opencircuitorlessthan2.5voltsrmsinto 600 ohms.Formercurybatteryreplacemen

47、tdata,refer toparagraph3-26,ChargingInstructionsfornickel cadmiumbatteriesaregiven inparagraph316, 310.OPERATIONWITHRECHARGEABLE BATTERIES. 3-11.ThereIsnochange in theoperatingprocedure for aninstrumentin which therechargeablebattery 01369-4 supply has beeninstalled.However, this powersup plypermits

48、eitheracoperatiOnfor115/230 vac-10% (selectedby switchonrear)50to 1000 cps power sourcesorbatteryoperationforportableapplications, Batteryoperationonly (withchargerpowercorddiJi- c08nected)isrequiredattemperaturesbelow 32 F (0landisrecommendedattemperaturesabove 104 F (400C), 3-12.When theRANGEswitc

49、histurnedOFF, power Isremovedfrom theoscillatorportionof theinstru- ment and aresistorisconnectedacrossthe output of thepowersupply.Thechargerwlll continue to operateaslongasthepowercordisconnectedtoa powersource,ThereSistor,placedacrosstheout put of the power supply,actsasa loadInplaceof the oscillatorsectionto maintain a constantchargerate through thebatteries.A diode in the outputcircuit preventsbatterydischargewhen theoscillatorisnot connectedtoapowersource, 3-13,Itisrecommended that