HP-523B-Manual 电路图.pdf

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Scanned by on-line curator: Tony Gerbic * For FREE Distribution Only * RadioFans.CN 收音机爱 好者资料库 OPERATINGANDSERVICINGMANUL MODEL 523B ELECTRONICCOUNTER SERIAL894ANDABOVE RadioFans.CN 收音机爱 好者资料库 R552: R553, 554: r!iJMANUALCHANGES HODEL523B ELECTRONICCOUNTER Serial894andabove: ERRATA: Addresistor,fixed,composition,1000ohms +10%,W; -hp-StockNo.23-1000,Mfr.,B- Connectedbetweenterminal2of84010andR547 Addresistor,fixed,composition,12,000ohms +10%, ;-hp-StockNo.23-12K,Mfr.,B- R553isconnectedbetweenR458andjunctionofR456 andR457 R554isconnectedbetweenpin19ofZ408andR464 Serial1494andabove: C311: C431, 433, 434, 436: Changetocapacitor,fixed,mica,1325pf1%,500vdcw; -hp-StockNo.0140-0155,Mfr.,E1Menco Changetocapacitor,fixed,mica,.001uf5%, 300 vdcw; -hp-StockNo.0140-0152,Mfr.,E1Menco R319,Changetoresistor,fixed,composition,10,000ohms 329,+5%,W;-hp-StockNo.23-10K-5,Mfr.,B 339,350-;- 361: 1/4/61 RadioFans.CN 收音机爱 好者资料库 OPERATINGANDSERVICINGMANUAL FOR MODEL 523B ELECTRONICCOUNTER SERIAL894ANDABOVE .1. HEWLETT-PACKARDCOMPANY 275 PAGEMILLROAD,PALOALTO,CALIFORNIA,U.S.A. 523B002 SPECIFICATIONS FREQUENCYMEASUREMENT RANGE: ACCURACY: INPUTREQUIREMENTS: INPUTIMPEDANCE: GATETIME: READSIN: PERIODMEASUREMENT RANGE: ACCURACY: INPUTREQUIREMENTS: INPUTIMPEDANCE: MEASUREMENT PERIOD: STANDARDFRE- QUENCYCOUNTED: READSIN: lacpsto1.1mc. 1countstability(seeGENERAL). O.2voltrmsminimum. Accoupled:Approximately1megohmshuntedbynotmorethan45f. Approximately.001,01,.1,1,10seconds. Kilocycles;decimalpointautomaticallypositioned. 00001cpsto10kc. O.30/0(formeasurementsofoneperiod) .030/0(10periodaverage)at1voltrms. Improvedbygreaterinputvoltage. 1voltrmsminimum;directcoupled. DcCoupled:Approximately1megohmshuntedbynotmorethanlOOf, at10kc. 1or10cyclesofunknown. 10cps,1kc,100kc,1mc,orexternalappliedfrequency. Seconds,milliseconds,microseconds;decimalpointautomaticallypo- sitioned. TIMEINTERVALMEASUREMENTS RANGE: ACCURACY: INPUTREQUIREMENTS: INPUTIMPEDANCE: 3microsecondsto100,000seconds(27.8hours). 1count,stability(seeGENERAL). 1voltminimum.Directcoupledinput. Dccoupled:Approximately1megohmshuntedbynotmorethan120f. SPECIFICATIONS (CONTID.) - TIMEINTERVALMEASUREMENTS(Contd.) STARTANDSTOP: TRIGGERS.LOPE: TRIGGERAMPLITUDE: STANDARDFRE- QUENCYCOUNTED: READSIN: GENERAL REGISTRATION: STABILITY: DISPLAYTIME: OUTPUTFREQUENCIES: STARTANDSTOP MARKEROUTPUTS: POWERSUPPLY: Independentorcommoninput. Positiveornegativeonstartand/orstopinput. Continuouslyadjustableonbothinputchannelsfrom-300to+300volts. 10cps,1kc,100kc,1mc;external. Seconds,milliseconds,microseconds;decimalpointautomaticallypo- sitioned. Sixplacesonneonlampdecadeunits. 2/1,000,000perweek. VariablefromapproximatelyO.1to5seconds;orinfinite. Secondarystandardfrequenciesavailableatfrontpanel10cps,Ikc rectangular100kcand1mcsinewave(stabilityasabove). .StartandStoppulseoutput(widthapproximately5.lsec.). 115/230volts10%,50-60cps,approximately370watts. DIMENSIONS:CabinetMount: RackMount: 13-1/4widex 17highx21-1/811deep. 19Hwidex1411highX19-3/811deepbehindpanel. WEIGHT: ACCESSORIES FURNISHED: ACCESSORIES AVAILABLE: CabinetMount:Net54lbs.,shipping81lbs. Twor&AC-16KCableAssembly,4feetofRG-58/U50ohmcoaxial cableterminatedateachendwithUG-88/UTypeBNCmaleconnector. eFtAC-16DCableAssembly,44inchesofRG-58/U50ohmcoaxial cableterminatedatoneendonlywithaUG-88/UTypeBNCconnector. (fj)Model508TachometerGenerator.Converts523Bintotachometer indicatorwithdirectmechanicalconnectiontoequipmentundertest. 523B-95A,Model560ADigitalRecorderAdapterKitforfieldin- stallation. I CONTENTS 5-1TableofReplaceableParts SECTIONIV MAINTENANCEINSTRUCTIONS SECTIONV TABLEOFREPLACEABLEPARTS OPERATINGNOTE MODELAC-4D-95 DECADECOUNTER ,. 4-1 Page 4-1 4-1 4-3 4-1 4-3 4-3 4-9 4-9 4-11 4-11 4-3 4-7 4-11 4-11 4-7 4-12 5-1 Introductory. ReplacingtheAirFilter RemovingtheInstrument Cabinet Connectingthe523BforUseon 230-voltPowerLines. ServicingEtchedCircuits. TubeReplacementChart IsolatingTroublestoMajor SectionsUsingtheTrouble Lights CheckingforMarginal Operation AdjustingthePowerSupply AdjustingtheTimeBase Section 100-KCOscillatorand AmplifierAdjustments FrequencyDividerAdjustments AdjustingtheGateSection. PeriodandFrequency SensitivityAdjustments. TimeIntervalZeroLevel CalibrationAdjustments GateLengthAdjustment TroubleShootingfromFront PanelIndications 4-1 4-2 4-3 4-4 Para 4-9 4-10 4-10A 4-5 4-6 4-7 4-l0B 4-11 4-11A 4-8 4-11B 4-llC 4-12 2-9 2-9 2-1 2-2 2-3 2-4 2-5 2-6 2-7 2-8 2-9 2-1 2-1 2-11 2-9 2-11 2-11 2-13 2-17 2-19 2-19 Page 1-1 1-1 SECTIONII OPERATINGINSTRUCTIONS Description. TypesofMeasurements Introductory AirFilter InstallationandOperating Precautions. ControlsandTerminals HowtoSelfCheckthe523B HowtoMeasureFrequency. HowtoMeasurePeriod HowtoMeasureTimeInterval HowtoTotalize HowtoMeasureFrequencyRatio HowtoUsethe523Basa SecondaryFrequencyStandard HowtoUsethe523BWiththe r$j)560ADigitalRecorder The100-KCCrystalOscillator HowtoStandardizetheCrystal OscillatorAgainstWWV HowtoStandardizetheCrystal OscillatorAgainst aLocal FrequencyStandard HowtoSubstituteanExternal FrequencyStandardforthe InternalStandardinthe523B FrequencyMeasurementData PeriodMeasurementData TimeIntervalMeasurementData TotalizingData RatioMeasurementData SECTIONI GENERALDESCRIPTION 1-1 1-2 2-13 2-14 2-15 2-16 2-1 2-2 2-3 Para 2-17 2-18 2-19 2-20 2-21 2-4 2-5 2-6 2-7 2-8 2-9 2-10 2-11 2-12 SECTIONIII THEORYOFOPERATION 3-1 3-2 3-3 3-4 3-5 3-6 3-7 3-8 3-9 3-10 3-11 3-12 3-13 3-14 Introductory TheoryofOperation-General TimeBaseSection. CrystalOscillatorand FrequencyMultiplier PhantastronFrequencyDivider DecadeDividerPlug-InUnit TriggerPlug-InUnits InputSignalStabilizedAmplifier. InputSignalAutomaticNoise Filter InputSignalGate SignalGateControlBinary DisplayTimeCircuits ResetCircuits. PowerSupply 3-1 3-1 3-3 3-3 3-3 3-4 3-5 3-5 3-5 3-6 3-6 3-6 3-7 3-7 OPERATINGANDSERVICINGMANUAL FOR MODELAC-4A DECADECOUNTERS SectionI -GeneralDescription-1- SectionII-Installation.-2- SectionIII-TheoryofOperation-4- SectionIV-ServicingtheAC-4APlug-In CounterUnit-9- SectionV -TableofReplaceableParts fortheAC-4A-17- SECTION I GENERAL DESCRIPTION ., 1-1DESCRIPTION TheHewlett-PackardModel523BElectronic Counterisaprecisionfrequency-andtime- measuringinstrument.Itmeasuresfrequen- ciesfrom.00001cycletoover1.1megacycle persecondandtimeintervalsfrom3micro- secondsto27.8hours,computesfrequency ratios,andcountsrandomorperiodicevents; theanswerisinstantlydisplayedinlighted numeralsacrossthefrontpanel.Thisdirect- readingdigitaldisplaypermitseffortless reading,andtheanswerisobtainedwithout makingdifficultcontrolsettings.Operating controlsarestraight-forwardandfoolproof sothathighlyaccuratemeasurementscanbe madereliablyandwitheasebynon-technical personnel.The523Bcanconvenientlybe checkedforsatisfactorycircuitoperation throughitsownindicatingsystem.Provision ismadeforusinganexternalfrequencystand- ardinplaceoftheinternalstandardifasource havinggreaterthan2parts/million/weeksta- bilityisavailableoriftheinternalfrequency standardisdisabled. The523Bincorporatesnewfeatureswhich addtoreliability,stability,flexibility,ease ofmaintenance.Printedwiringisextensively use.dbothinplug-inunitsandinthechassis. Keycircuitsareequippedwithspecialindi- catorlightssothatataglancetheycanbe quicklychecked.Ifalightdoesnotlight,or actserratically,itindicatesthecircuitat fault.Thisfeaturewillassistservicetech- nicansgreatlyinmakingafasttroubleanaly- sisincomplicatedcircuits. 1-2TYPESOFMEASUREMENTS a.FrequencyMeasurements Frequencymeasurementsinthe523Bare indicateddirectlyinkilocycles,alighteddeci- malpointisautomaticallypositionedtogive adirect-readinganswerforfivedifferent frequency-samplingtimes:O.001,O.01,O.1, and10seconds.Thelongersamplingtimes providemoresignificantfiguresandare especiallyusefulwhenreadinglowfrequen- cies;theshortersamplingtimesprovidea continuous,non-flickeringdisplaywhenmak- ingquickrepetitivemeasurementsofchanging frequencies.Answerdisplaytimeiscontinu- ouslyadjustablefromO.1second(butnot shorterthanthegatetimeused)to5seconds, orthedisplaycanbeheldindefinitely. b.PeriodMeasurements Periodmeasurements(thereciprocalof frequency)areindicatedinseconds,milli- secondsormicrosecondsasselectedbythe operator,thedecimalpointbeingautomati- callypositionedforthetimeunitselected. Itisalsopossibletomake10-periodaverage measurementstoobtaina10-timesincrease inperiodmeasurementaccuracy.Special carehasbeentakentoassurethatperiod measurementswillalwaysbeaccurately startedandstoppedatexactlythesamevolt- agelevelontheinputwaveform.Periodmeas- urementsaremostoftenusedformeasuring lowfrequenciestoobtainmoresignificant figuresthanwouldbeobtainedbymeasuring frequencydirectly,thusmakingpossiblethe measurementoffrequenciesaslowas0001 cps. c.TimeMeasurements Timemeasurementsareindicatedinsec- 0ndsmilliseconds,ormicrosecondsasse- lectedbytheoperator,thedecimalpointbeing automaticallypositionedforthetimeunitse- 1ected.Timeintervalmeasurementscanbe startedinavarietyofways:1)asinglepuIse canbeusedtobothstartandstoptheinter- val;2)onepulsecanstartitandanotherstop it;3)eitherthepositive-goingornegative- goingportionofaninputwaveformcanbeused tostartorstoptheinterval,and4)theinter- valcanbestartedandstoppedatanyselected voltagelevelfrom-300voltsto+300volts. Toshowtheexactpointsonaninputwavethat atime-intervalmeasurementisstartedand stopped,the523Bproducespositiveoutput pulsesthatcanbeusedtointensity-modulate anoscilloscopethatviewstheinputwaveform. Thestartandstoppointsareindicatedby brightdotsonthewaveform.Thecalibrated STARTandSTOPTRIGGERLEVELcontrols adjustthestartandstoppointstothedesired voltagelevelsonthewaveform. 1-1. d.FrequencyRatiose.Totalizing Frequencyratiosaredisplayeddirectly whentwoinputsignalsareconnectedtothe front-panelINPUTandSTD.FREQ.OUTPUT connectors.Anyratioupto999,999to1will bedisplayed.Themeasurementisrepetitive andthedisplaytimeisadjustablejustaswith frequencymeasurement. 1-2 Totalnumberofeventsupto999,999 arecountedsimplybyconnectingelectrical impulseswhichcorrespondtoeventstothe inputconnectorandmanuallyopeningthe MANUALGATEtoggleswitchforthedesired period.WhentheMANUALGATEswitchis closed,thetotalisdisplayeduntiltheswitch isreopenedforanothermeasurement. SECTION II OPERATING INSTRUCTIONS 2-17 2-18 2-19 2-20 2-21 2-1INTRODUCTORY Thissectionexplainshowtomakefivebasic measurements:frequency.period.timein- terval.totalizingandratio.Eachtypeof measurementisexplainedonasinglepage containingan-illustrationandstep-by-step procedure.Detailed,supportinginformation foreachmeasurementisthengivenlaterin thesection.Theseproceduresarebasicuses andshouldbeconsideredasaguidetomaking newtestset-upswhenmeetingnewanddif- ferentmeasurementproblems.Thematerial inthissectionisasfollows: 2-2AirFilter 2-3GeneralPrecaution 2-4ControlsandTerminals 2-5HowtoSelfChekthe523B 2-6HowtoMeasureFrequency 2-7HowtoMeasurePeriod 2-8HowtoMeasureTimeInterval 2-9HowtoTotalize 2-10HowtoMeasureFrequencyRatio 2-11HowtoUsethe523BasaSecondary FrequencyStandard 2-12HowtoUsethe523Bwiththe560A DigitalRecorder 2-13The100-kcCrystalOscillator 2-14HowtoStandardizethe100-kcOscil- latorAgainstWWV 2-15HowtoStandardizetheCrystalOscil- latorAgainstaLocalFrequency Standard 2-16HowtoSubstituteanExternalFrequen- cyStandardfortheInternalStand- ardinthe523B FrequencyMeasurementData PeriodMeasurementData TimeIntervalMeasurementData TotalizingData RatioMeasurementData 2-2 AIRFILTER Inspecttheairfilteroftenwhenthe523Bis inconstantuse. Theair-filterelementinthe523Bisare- newabletype.Itislocatedontherearofthe instrumentcabinetandisremovedbysliding itupandout.Torenewthefilterelement, washinwarmwateranddetergent,thenre- coatwithaspecialoil.suchasResearch ProductsCorp.FilterCoatNo.3. 2-INSTALLATION AND OPERATING PRECAUTIONS The523BElectronicCounterisaportable testequipmentintendedforbenchuseandre- quiresnospecialinstallationinstructions excepttoplacetheinstrumentsothatthe ventilatinglouversarenotobstructed.To maintainthe523Bsspecifiedstabilityatall times.itshouldremainconnectedtothepower sourceduringperiodsofnon-use.Thecrystal ovenwillthenremainataconstanttemper- atureandonlyafive-minuteswarm-upwill berequiredtoreachspecifiedstabilitywhen theinstrumentisagainturnedon.Ifthe523B isdisconnectedfromthepowersourceand allowedtocool,1/2hourisrequiredforthe crystaloventoreachoperatingtemperature andprovidethespecifiedstability.During the1/2hourwarm-upitshouldbepossible toobtaincorrectself-checkanswers. Whenconnectingasignaltobemeasuredto the523Binput.usecaretopreventhumand noisepickupbythesignalsourceorbythe inputlead.Noiseofsignificantamplitudeon theinputwaveformcanbecountedinaddition tothedesiredsignal.Iferraticcountdisplays areunexpectedlyobtained,observetheinput signalwaveformonanoscilloscopetocheck forunwantedsignals.Iftheinputsignalcon- tainsmuchnoise,adjusttheINPUTSENSI- TIVITYcontroltothelowestsensitivitythat givesareliablecount.Reliablemeasurements mightstillbemadewiththenoisepresent iftheadjustmentmakesthe523Bonlysensi- tiveenoughtorespondtothedesiredsignal. Whenmakingperiodandtimeintervalmeas- urements,rememberthatanyd-ccomponent ontheinputsignalwaveformcanaffectthe accuracyofthemeasurementandshouldbe accountedfor. Sincetheself-checkfeatureisquickandcon- venient,itisrecommendedthatitbemade wheneveryoustartameasurementtoestab- lishconfidenceinthesatisfactoryoperation ofthe523B. The523Bcanbeusedon230-volta-cpower ifdesired.Seepara.4-4fordirections. 2-1 2-4 CONTROLS AND TERMINALS POWER (toggleswitch) Applieslinepowertotheventilatingfanand powertransformerforoperationofthe counter. FUNCTIONSELECTOR (rotaryselectorswitch) Selectsthetypeofmeasurementdesired; SELFCHECK,FREQUENCY,PERIOD10- PERIODorTIMEINTERVAL.Switchesthe GateandTimeBaseSectionssothatthe TimeBaseopensandclosestheSignalGate tomeasurefrequencyorsothattheinput signalopensandclosestheSignalGateto counttimeunitsfromtheTimeBase. FREQUENCYUNIT (rotaryselectorswitch) Selectsoneoffivestandardgatetimes (.001,.01,0.1,1.0and10seconds)from theTimeBaseSectiontoopenandclose theSignalGatewhenmeasuringfrequency. SIGNALINPUT (BNCconnector) Receivestheinputfrequencytobemeasured. CO:lnectstotheSignalGateSection,forap- plicationtotheCounters. SIGNALSENSITIVITY (potentiometer) Adjuststhesensitivityofthecountertothe inputsignalwhenmeasuringfrequency. TIMEUNIT (rotaryselectorswitch) Selectsoneofthreetimeunits(seconds,mil- lisecondsormicroseconds)fromtheTime BaseSectiontobefedtothecountersduring TimeIntervalandPeriodmeasurements. Thisswitchalsoindicateswhichtimeunit isfedtotheSTD.FREQ.OUTconnector. TIMEINTERVALTRIGGERSLOPE (toggleswitch) Thelefthandtoggleswitchdetermines whetherthetimemeasurementwillstart onanegativeorapositivegoingvoltage. Therighthandtoggleswitchdetermines whetherthetimemeasurementwillstopon anegativeorapositivegoingvoltage. TRIGGERLEVELVOLTS (dualcontrol;outercontrol,continuousad- justment;cntercontrol,stepattenuator.) Thelefthandconrolsetsthevoltagelevel atwhichatimemeasurementwillbeg