HP-150-1800-Manual 电路图.pdf
HP Archive This vintage Hewlett Packard document was preserved and distributed by Pleasevisituson the web! Scanned by on-line curator: Tony Gerbic * For FREE Distribution Only * RadioFans.CN 收音机爱 好者资料库 STABILIZEDDCPREAMPLIFIER MODEL 150-1800 IM-150-1800-1 INSTRUCTIONMANUAL I I )HEWLETT_ )PACKARDbSANBORN IDIVISION J RadioFans.CN 收音机爱 好者资料库 SANBORNCOMPANY 175WYMANSTREET WALTHAM 54, MASS. TEL:TW 4-6300 FEBRUARY 12, 1958 INSTRUCTION MANUAL SUPPLEMENTS 1M-150-1800-IA(Rev) 1M-150-1800-10 SANBORNSTABILIZEDDCPREAMPLIFIER MODEL 150-1800, A l i I I I I ! I I t I I l 1M-150-1800-1ADecember18,1956 ThisSanbornInstrumentusesaspecially-manufacturedcalibrationcell.Thiscellhasnot onlybeencarefullyselectedandprocessedforconstantvoltage outputoverlongperiodsof time,but isalsoof extra-heavyconstruction,asaguardagainstdeterioration.Douse acommonhearingaidbatteryasareplacement-thisinvitesincorrectvoltagereadings anddamagefromcorrosion.Use only thereplacementcalibrationcellidentifiedasSanborn No.2C-4,availablefromyournearestSanborn Companyrepresentative,ordirectlyfrom Sanborn Company, Waltham,Mass. Figure1intheInstructionManual shows ashieldingonthecablingbetweenthesignalsource andthePreamplifier.Thisshieldingisshown groundedatbothends.Insomecases,this canintroduceagroundloopinthewiringbetweenthesignalsourceandthePreamplifier. Ifa ground loopissuspected(whenthereisinterferenceontherecordinifnot,adjust+80 ADcontroltomakethedeflectionthesame. RadioFans.CN 收音机爱 好者资料库 SANBORNCOMPANY 175 WYMANSTREET WALTHAM 54.MASS. TEL:TW-4-6300 DECEMBER 24. 1958 llJSTRUCTION MANUAL SUPPLEMENT 1M-lSO-1800-lE IM-lSO-1800-IF SANBORNSTABILIZED DC PREAMPLIFIER MODEL 150-1800 TheInstructionManualIM-150-1800-1fortheStabilizedDCPreamplifiershouldbecorrected asfollows: Page3.Figure1showsashieldedcablebetweenthesignalandthePreamplifier. Theshieldisshowngroundedatbothends.Insomecase$,thisforms agrotmdloopbetweenthesignalandthePreamplifier,whichcancause interferenceontherecording.Ifthishappens.tryoperationwiththe shieldgroundedatoneendonly. Page 3Paragraph7 BALANCINGTHEPREAMPLIFIER Addstep: 6.Afteroncebalancedtothecenterofthechart,re-balancing willusuallynotbeneeded.When youwanttocheck: gothroughthe balancingprocedure.andnotethedeflectioninstep3.Ifthisde- flectiondoesnottakethestylusbeyondtheedgeofthe ret:ording channel,re-balancingisnotrequired.Thestabilizingamplifierstage willcorrectit. Maintenancenotes0 TheDriverAmplifierusedwiththisPreamplifiershouldhaveits+80 ADJcontrolre- setafterreplacingitsglowtubevoltageregulator(V209in150-200, V208inISO-200A, 150-200B).Toadjust,applypositivetestvoltagefrom1.019voltstandardcelltoin- putterminalofPreamplifierthrough19,000ohm O.5%resistance.(Thisappliesa +1.000voltsignaltoinputterminals).SetATTENUATORtoX500,turnfunctionswitch backandforthbetweenUSEandOFF,andnotestylusdeflection.NowsetATTENUATOP toXlandtumfunctionswitchbackandforthbetweenCAL andOFF.Stylusdeflection shouldbethesameasthatobtainedfromstandardcell;ifnot,adjust+80 ADcontrol tomakethedeflectionthesame. 1M-lSO-1800-lF CCMMENTS ON PARAGRAPH 13 PAGE 6 :Jhenrecordingnearlinefrequency,thereisasmallpossibilityofa b:at noteshowing intherecording.AnimproperlysetStabilizedGaincontrolRl822cancausethisbeat note.Ifsuchabeatnoteisvisible,theStabilizeGaincontrolR1822maybere-setbv adjustingforminimumbeatnote. SANBORNCOMPA1IY 175WYMANSTREET WALTHAM 54, MASS. TEL:TW-4-6300 NOVEMBER 24, 1961 INSTRUCTION MANUAL SUPPLEMENT 1M-150-l800-lG SANBORNSTABILIZEDDCPREAMPLIFIER MODEL 150-1800, lsO-1800A ;11 III 111 n IIj tl I I III 11 U LiJ fI 1) 1M-150-l800-lG SUBJECT:BALANCINGTHEPREAMPLIFIER Page 3,paragraph7ofthestandardinstructionmanual. ADDITIONAL INFORMATION:ThestabilizedDCpreamplifieremploysa3-stageresistance coupledamplifiercircuit,whose outputisstabilizedby acorrectionsignalapplied atitsinputfroma2-stagestabilizingchopperamplifiercircuit. BALANCINGTHEPREAMPLIFIERasdescribedinpage3,paragraph7ofthe standardinstructionmanualisperformedtoavoidoverloadingthestabilizing amplifiercircuit.Oncethisstephasbeeninitiallyperformed,itneednotbe repeatedforeachsuccessiveoperationaluseofpreamplifier. Thebalancingproceduremustbeperformedonly when a componenthasbeen replacedwithinthepreamplifier,orwhenitissuspectedthatthepreamplifier isnotoperatingwithinitsspecifiedaccuracy. Intheperformanceofthestep,anoutputdriftwillbenoticedwhentheUSE-OFF- CAL-ZERO-BALswitchisturnedtotheBALposition.Thisdriftisnotanindica- tionofpoorpreamplifierperformance,itishoweveranindicationthatthe stabilizingsignalhasbeenremoved,whichisexactlywhathappens. AstudyofthepreamplifierschematicwillshowthatwhentheUSE-OFF-CAL- ZERO-BALswitchisturnedtotheBALposition,theoutputfromthestabilizing networkisdisconnectedfromtheDCamplifiercircuitinput. INSTRUCTION MANUAL TABLEOFCONTENTS ParagraphPage 1Introduction.1 2TableofCharacteristics.1 3FrontPanelControls.1 4BasicProcedures.3 5ConnectingtheInput3 6StartingthePreamplifier.3 7BalancingthePreamplifier3 8CalibratingthePreamplifier4 9UsingthePreamplifier.4 10ZeroSuppression.4 11CheckingStabilizingAmplifierOperation.6 12AdjustingtheSensitivityBalance:.6 13AdjustingtheGainStabilizer.6 14AdjustingtheAttenuatorTrimmers.7 15AdjustingtheInternalBalance7 16RemovingandReplacingPreamplifiers.7 17CheckingandReplacingZeroSuppressionCells.8 18TheoryofOperation8 19FunctionalDescription:.9 ThenameSANBORNisregisteredintheU.S.PatentOf/ice. SANBORNSTABILIZEDDCPREAMPLIFIERMODEL150-1800 INSTRUCTIONMANUAL SANBORNSTABILIZEDDCPREAMPLIFIERMODEL150-1800 1.INTRODUCTION SanbornStabilizedDCPreamplifier,Model150-1800,isadirect-coupledpreamplifierhavinghigh gain,broadfrequencyresponse,andahighdegreeofstabilityagainstbaselinedrift.Thepreamp- lifieroutputisstabilizedagainstdriftby achopperamplifierwhichprovidesacorrectionvoltage. Thepreamplifiergainisstabilizedby aconventionalnegativefeedbackloop. ThispreamplifiermaybepluggedintoeitherSanbornDriverAmplifierandPowerSupplyModel 150-200B/400,orSanbornWideBandDriverAmplifierandPowerSupplyModel150-300/700. Thefrequencyresponseofthesystemismodifiedby thecharacteristicoftheDriverAmplifierwith whichthepreamplifierisused;anoutputvoltagenotmodifiedbytheDriverAmplifierisavailable attheOUTPUTjackofthepreamplifier,however. 2.TABLEOFCHARACTERISTICS ThefollowingcharacteristicsarethoseoftheModel150-1800Preamplifier,Model150-200BDriver Amplifier,andSanborn150SeriesRecordercombined,exceptwhereotherwiseindicated. SENSITIVITY1mv./cm.to2volts/em. DRIFTApproximately0.1mm./he. GAINOFPREAMPLIFIER1000.ThisgainismeasuredfrompreamplifierINPUTto preamplifierOUTPUTjack. DRIFTOFPREAMPLIFIEROUTPUTMeandriftis5mv./hr. INPUTSingle-endedonly,onemegohminputresistance. J 1 J FREQUENCYRESPOSE NOISE ZEROSUPPRESSION 3.FRONT PANEL CONTROLS POSITION DCto3 db. downat10,000cycles,measuredfrompreamp- lifierINPUTtoOUTPUTjack.(TheOUTPUTjackis intendedforloadsofonemegohm orgreater,suchasoscillo- scopeandvacuum-tubevoltmeters.). Noiseplus60cyclecomponent:46db.belowfullscale deflection. Positiveornegative,uptotwentytimesfullscaledeflection. Thiscontrolprovidesindependentadjustmentofstylus positionorotherindicator.Clockwiserotationmovesthe stylusupscale. 3.FRONT PANEL CONTROLS (Cont.) USE-OFF-CAL-ZERO-BAL BALANCE SENSITIVITY CAL2MV ATTENUATOR DCZEROSUPPRESSION SUPPRESSIONVOLTAGE INPUT OUTPUT INSTRUCTION MANUAL ThisswitchdeterminesthefunctionofthePreamplifier. USEposition:theinputterminalsareconnectedtothe Preamplifierinput,andthestabilizingamplifierisoperative. OFFposition:theinputterminalsaredisconnected,the Preamplifierinputcircuitisgrounded,powerremainscon- nectedtothePreamplifier,andthestabilizingamplifieris. operative. CALposition:thepreamplifierinputcircuitisconnectedto the2 mv.calibrationvoltagecircuit,andthestabilizing amplifierisoperative. ZEROposition:theinputofthephase-inverteramplifier (whichcouplesthedcpreamplifiertothedriveramplifier)is groundedtoprovideareferenceforbalancingthePreamp- lifier. BALposition:thestabilizingamplifierisinoperativeto permitindependentadjustmentofthedcpreamplifier. Thiscontroldeterminestheoperatingconditionswhich demandleastoutputfromthestabilizingamplifier.This ensuresthestabilizersworkingwellwithintheoverload limitingcircuitoperatingpoint. ThisconcroldeterminestheamountofPreamplifieroutput whichisappliedtotheinputoftheDriverAmplifier. Thisbuttonappliesatwomillivoltcalibrationsignaltothe inputcircuitoftheinstrument. Thisswitchattenuatestheinputsignalby thefollowing accuratelyfixedfactors:1,2,5,10,20,50, 100,200,500, 1000and2000. Thisswitchinsertsavoltageofthecorrectpolaritytooff- setthezerolineforrecordingsmallvoltagesinacircuit whichmaybeatahighvoltagelevel.Amethodofchecking thetwozerosuppressioncellsbycomparingtheiroutput voltagesisprovided. Thiscontroldeterminesthe amountofinputvoltagesuppressed. Thisconnectorisusedtoconnecttheinputsignaltothe instrument. Thisjackisusedtoconnectaloadofnotlessthanone megohmtotheinstrument.Thisoutputcircuitisnotaffected bytheSENSITIVITYcontrol. 2 SANBORNSTABILIZEDDCPREAMPLIFIER MODEL 150-1800 1 4.BASIC PROCEDURES ,I TherearefourbasicprocedurestobefollowedinpreparingthePreamplifierforoperation:connecting theinputandstartingthePreamplifier,balancing,calibrating,andusingthePreamplifier. ConnectingtheinputandstartingthePreamplifier:involvesmakingtheinputconnectionsandturning onthePreamplifierfor w.arm-up. BalancingthePreamplifier:avoidsoverloadingthestabilizingamplifier. CalibratingthePreamplifier:adjuststheoverallbasicsensitivitytoexactlyonecentimeterdeflection permillivoltinput. UsingthePreamplifier:includesinterpretingtherecord,andmakinguseofsuchoptionalfeaturesas zerosuppressionandtheOUTPUTjack. 5.CONNECTING THE INPUT1 Applypowerandallow30minuteswarmup for maximumstability.ConnectthesignaltotheINPUT socketonthepanelortheconnectorJ204orJ304attheDriverAmplifierrear,asshowninfigure1. ApositivepotentialatterminalAwithrespecttoterminalB (orofpin1withrespecttopin3)gives anegativepotentialattheOUTPUTjackandanup-scaledeflectionofthegalvanometerorother indicatorconnectedtotheDriverAmplifier. j J 1 or 204 1304 I t- r-4-J _1-I : SIGNAL_.: ,SOURCEIL1 r - - - -, I I I I, Figure1.InputCircuitConnectionstoStabilizedDC Preamplifier. 6.STARTING THE PREAMPLIFIER ThePreamplifierderivesitsoperatingpowerfromtheassociatedDriverAmplifier/PowerSupply,and isturnedonwiththeseunits.TurntheATTENUATOR,ZEROSUPPRESSIONandUSE-OFF-CAL- ZERO-BALswitchestoOFF,andallowthePreamplifiertowarmupthirtyminutesbeforemaking adjustmentsortakingrecords. j 7.BALANCING THE PREAMPLIFIER BalancethePreamplifieronlyafterithaswarmedupatleastthittyminutes.Thisisusuallynot requiredasanoperationalstep. iJ 1.TurntheUSE-OFF-CAL-ZERO-BALswitchtoZERO. 2.AdjustthePOSITIONcontroltoplacethestylusinthecenteroftherecordingchart. 3.TurntheUSE-OFF-CAL-ZERO-BALswitchtoBAL.Unlesstheinstrumentisalreadybalanced, thestyluswilldeflect. 3 INSTRUCTION MANUAL 7.BALANCING THE PREAMPLIFIER (Cont.) 4.AdjusttheBALANCEcontroltoreturnthestylustothecenterofthechart.Thisisasensitive adjustment,butitisnotcriticalbecauseaslightresidualunbalanceisautomaticallycorrected bythestabilizingamplifier. 5.TurnUSE-OFF-CAL-ZERO-BALswitchtoCAL. 8.CALIBRATING THE PREAMPLIFIER 1.TurntheATTENUATORtoXl. 2.TurntheUSE-OFF-CAL-ZERO-BALswitchtoCAL. 3.PresstheCAL2MVbuttonintermittentlyandadjusttheSENSITIVITYcontrolfor astylus deflectionofexactlytwocentimeters.Thebasicsensitivityofthesystemisnowonemillivolt percentimeter. 9.USINGTHEPREAMPLIFIER Tooperatethepreamplifier: 1.TurntheATTENUATORtoOFF. 2.TurntheUSE-OFF-CAL-ZERO-BALswitchtoUSE. 3.SetthestylustoaconvenientbaselinebyadjustingthePOSITIONcontrol. 4.TurntheATTENUATORclockwisefor aconvenientstylusdeflection,orsetittotheappropriate attenuationfactorfortheexpectedsignallevel. 5.Turnonthepaperdrivemotortostarttherecording. 6.Readvoltageinputinmillivoltsfromtherecordbymultiplyingthedeflectionincentimetersbythe attenuationfactor. 10.ZERO SUPPRESSION Aproblemwhicharisesoccasionallyisthemeasurementandrecordingofasmallvariationofahigh voltagelevel.SENSITIVITYandATTENUATORsettingswhichwouldprovideadequatedeflection forthesmallvariationwouldblockthestyIusoff-scalebecauseofthehighvoltagelevel.Conversely, ATTENUATORandSENSITIVITYsettingswhichpermitregistrationofthehighvoltagelevellimit thedeflectioncausedby thesmallvariation.TheZeroSuppressioncircuitprovidesthesolutionby subtractingthehighvoltageandleavingonlythesmallervariation.Effectively,itsuppressesthe zerolinebyremovingitfromtherecordingscale. Theamountofinputvoltagewhichmaybesuppressedistwentytimesthevoltagewhichproduces fullscaledeflection.ThisistrueatallKTTENUATORsettingsbecausethezerosuppression circuitisindependentoftheattenuatorcircuit.TheATTENUATORisnormallysettoreducethe inputsignalvoltagetothe1mv./cm.level,therebyaffordingabasisforelectricalcomparison. Theamountofvoltagesuppressedmaybereaddirectlyfromthezerosuppressiondial. 4 SANBORNSTABILIZEDDCPREAMPLIFIERMODEL150-1800 10.ZERO SUPPRESSION (Cont.)I Refertothefollowingtableforguidanceincalibratingthesystem,settingthecontrolsandinterpreting I therecording: ATTENUATOR1CM.DEFLECTIONFULLSCALEMAXIMUMVOLTAGEVALUEOF SETTINGDEFLECTIONWHICHMAYBEEACHZ.S. J SUPPRESSEDDIALDEGREE Xl1MV.5MY.100MY.0.1MY. X22MY.10MV.200MY.0.2MY. X55MY.25MV.500MY.0.5MY. X1010MY.50MV.1 Volt1.0MV. X2020MV.100MV.2Volts2.0MY. X5050MV.250MY.5Volts5.0y.j X100100MV.500MY.10Volts10.0MY. X200200MV.1Volt20Volts20.0MV. I X500500MY.2.5Volts50Volts50.0MY. X10001 Volt5Volts100Volts100MY. X20002Volts10Volts200Volts200MY. TherearetwopracticalwaysofsettingtheZEROSUPPRESSIONcontrols: a.Whenthelevelofthevoltagetobesuppressedandtheamplitudeofthevoltagewaveformtobe recordedareknown,turntheDCZEROSUPPRESSIONswitchto+ifapositivepotentialistobe suppressed,orto-ifanegativevoltagebaseistobesuppressed,andturntheSUPPRESSION VOLTAGEcontroltothevalueofthedcvoltageleveltobesuppressed. b.Whenthelevelofvoltagetobesuppressedandtheamplitudeofthevoltagewaveformtobe recordedarenotknown,turntheDCZEROSUPPRESSIONswitchtothepolarityofthebase voltagetobesuppressed,andadvancetheATTENUATORandSUPPRESSIONVOLTAGEcontrols fromzerosimultaneouslyuntilaconvenientdeflectionisobtained. Tointerpretthefinalrecording,readthetotalinputvoltageasthealgebraicsumoftwocomponents: therecordedcomponentandthesuppressedcomponent. Therecordedcomponentinmillivoltsisequaltotheproductofthedeflectionincentimetersandthe ATTENUATORsetting. ThesuppressedcomponentinmillivoltsistheproductoftheSUPPRESSIONVOLTAGEdialreading andthevalueofeachdialunitgivenintheprecedingtable. 1 j 5 NOTE:ThereisanoticeabledelayintheresponseoftherecordingsystemtotheZERO SUPPRE
