HP-400A-Brochure 电路图.pdf

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1、,.:-.- PRELHIINARYTECHNICALINFORMATION MODEL1:001.VOLTMETER TheModel400Aisa newa-cvoltmetertocovortho frequencyrangefrom10cpsto1megQcycle.Thisnew meterissimpleandroliableinoperationandprovides excellentaccuracyforgenerallaboratorywork. USES:The Model4001.isexcellentfornearlyevery applicationintheaud

2、iofrequencyfield.The BidQfre- quencyrangeisusefulformensuringtheresponsechrr- acteristicsofcmplifiors,transformers,networks,and otheraudioequipment.Mesurementswiththisinstrument arcpnrticulerlyaccuratebeceusotheindicationispro- portioncltothoaveragovaluoofthenve,andwaveform errorsnretherebyreducod.F

3、urthermorethehighinput impcdf)1ceofthismetc.:rviillnotordinarilyaffectthe circuitbin8measured. TheextendedfrequoncyofthoModel 400A makesit suitnbleforradiofrequoncymGeSUr0entsthroughthe brocdcstbendto1.5:nl.)gecycl.Thiscovers0.wide .rnngoofo.pplicatioLsincludingthecc.rriercurrent,super- sonic,televi

4、sion,andbroadcastfiolds.Theresponseis crrriedbulan10cyclesonth0lofrequencyendtomc.ke thismetersuitcbleforgeophysiccl,electromcdiccland otherepplictionsheretholOTIfrequenciesereimportant. Theusefulnessofthismetorisincreasedbecuseof itssensitivity.hfullsccleindicationisobtainedon 0.03voltsendsincethes

5、cnleislineerareasonblyaccurate monsurementofa 1millivoltconbemndeovertheentire frequencyrnge. DESCRIPTION:TheModel4001.consistsofa vJideband feedbackamplifierwhichoporetescdiodvoltmeterof.the nvorgereedingtype.Feedbackisu3edtostabilizenot onlytheamplifierbutalsothediodocurrentsothatthe overclloperat

6、ionisindependentoflineVoltageandtube cheracteristicstqahighdgrcc.Lspecielinputcmplifier circuitisusedtokeepthoinputimpedancetoavluoas highaspossibleandnleoto20rmittheuseofancccurnte voltegedividertoselectthevariousrnnges.Thepoer supplyisDelfcontainedanditisthoroughlyfilteredand olectrostaticellyshie

7、ldedfromtheprimo.ryvoltGgesource. ThorIodel4001.Meteri3mounted.inc.metalcaseviith theindicntingsccleonaslopingpaneltofc.cilitctereed- ings.Thescc.leinc.libretedInvoltscnddecibelsand theunitisGdequ.telyprotectedagc.instreGsonobleoverlonds. Thesmellsizeendlightveightofthemetercombinovithits excllentch

8、aracteristicstomc.keitarealtimesavingin- strumentinthelc.boratoryorinthefield. RadioFans.CN 收音机爱 好者资料库 flodGl 400A VOLTAGERANGE: FREQUENCYRANGE: CLLI3Rft.TION: ACCUR.-.CY: POWERSUPPLY: ?,WUNTING: SPECIFICATIONS Aswitchonthefrontpanelselectsnine voltageranzashDvingfull3CGlosonsitivities of.03volts,.1

9、volt,.3volts,1.0volts, 3.0volts,10.0volts,30.0volts,100volts, 300volts. Thefroquencyresponseofthometoriswithin .3%from10cpsto1,000,000cps.Roadings canbemadewithreasonableaccuracyto1.5 megacyclas. Themeterscalesarelinoarandnrecalibrated torQndther.m.s.valueofnsinusoidalwave. Thoindicationisproportion

10、altotheaverage valuoofthewave,thuswoveformorrorsare reducedto8.minimum.Adocibelscalois markedonthomotortofacilitatedecibelread- inGS. Th0oVGrallaccuracyofthemeteris3%. 3ccausoofthof00dbackcircuittheaccuro.cyis tohighdegre(;tndependontoflinevoltage variations,tubecharacteristicsandtemperature. Thoinp

11、utimpodanceisequivnlentto1 megohm shuntedby11uu. Tomoteroperatesfro120volls60cps,and thepowersupplycircuitisthoroup)11yfiltored EmdshieldedtoprQventstro.ypick-upfromthe pOViorsource. Themoter1smountodin&steolcabinetfinish- edinwrinklesrcy.Thefrontpanelisheavy brassfinishedinsatinchomeplatewithphoto-

12、 etcheddesignations.Thdcabinetis7-1/2 incheswide,8incheshigh,and9inchesdeep. Thetopportionorthepanelonwhichthemeter ismountedisslopingtofacilitatoreadingthe meterscale.AleatherhandleisprOVidedct thetopofthecabinot. The Model 400Awillbeavailablefordeliveryapproximately October1,1941.Theforegoingspocificationsarcpreliminary ndordorsmaybeplacedsubjecttoacceptanceoranychanges. HE:VLETll_PlCKJiRDCO. 481P3GCDillRoed PaloAlto,Calif. July31,1941 I, RadioFans.CN 收音机爱 好者资料库