HP-400A-Brochure 电路图.pdf

,.:-.- PRELHIINARYTECHNICALINFORMATION MODEL1:001.VOLTMETER TheModel400Aisa newa-cvoltmetertocovortho frequencyrangefrom10cpsto1megQcycle.Thisnew meterissimpleandroliableinoperationandprovides excellentaccuracyforgenerallaboratorywork. USES:The Model4001.isexcellentfornearlyevery applicationintheaudiofrequencyfield.The BidQfre- quencyrangeisusefulformensuringtheresponsechrr- acteristicsofcmplifiors,transformers,networks,and otheraudioequipment.Mesurementswiththisinstrument arcpnrticulerlyaccuratebeceusotheindicationispro- portioncltothoaveragovaluoofthenve,andwaveform errorsnretherebyreducod.Furthermorethehighinput impcdf)1ceofthismetc.:rviillnotordinarilyaffectthe circuitbin8measured. TheextendedfrequoncyofthoModel 400A makesit suitnbleforradiofrequoncymGeSUr0entsthroughthe brocdcstbendto1.5:nl.)gecycl.Thiscovers0.wide .rnngoofo.pplicatioLsincludingthecc.rriercurrent,super- sonic,television,andbroadcastfiolds.Theresponseis crrriedbulan10cyclesonth0lofrequencyendtomc.ke thismetersuitcbleforgeophysiccl,electromcdiccland otherepplictionsheretholOTIfrequenciesereimportant. Theusefulnessofthismetorisincreasedbecuseof itssensitivity.hfullsccleindicationisobtainedon 0.03voltsendsincethescnleislineerareasonblyaccurate monsurementofa 1millivoltconbemndeovertheentire frequencyrnge. DESCRIPTION:TheModel4001.consistsofa vJideband feedbackamplifierwhichoporetescdiodvoltmeterof.the nvorgereedingtype.Feedbackisu3edtostabilizenot onlytheamplifierbutalsothediodocurrentsothatthe overclloperationisindependentoflineVoltageandtube cheracteristicstqahighdgrcc.Lspecielinputcmplifier circuitisusedtokeepthoinputimpedancetoavluoas highaspossibleandnleoto20rmittheuseofancccurnte voltegedividertoselectthevariousrnnges.Thepoer supplyisDelfcontainedanditisthoroughlyfilteredand olectrostaticellyshieldedfromtheprimo.ryvoltGgesource. ThorIodel4001.Meteri3mounted.inc.metalcaseviith theindicntingsccleonaslopingpaneltofc.cilitctereed- ings.Thescc.leinc.libretedInvoltscnddecibelsand theunitisGdequ.telyprotectedagc.instreGsonobleoverlonds. Thesmellsizeendlightveightofthemetercombinovithits excllentcharacteristicstomc.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,.1volt,.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. Thoindicationisproportionaltotheaverage valuoofthewave,thuswoveformorrorsare reducedto8.minimum.Adocibelscalois markedonthomotortofacilitatedecibelread- inGS. Th0oVGrallaccuracyofthemeteris3%. 3ccausoofthof00dbackcircuittheaccuro.cyis tohighdegre(;tndependontoflinevoltage variations,tubecharacteristicsandtemperature. Thoinputimpodanceisequivnlentto1 megohm shuntedby11uu. Tomoteroperatesfro120volls60cps,and thepowersupplycircuitisthoroup)11yfiltored EmdshieldedtoprQventstro.ypick-upfromthe pOViorsource. Themoter1smountodin&steolcabinetfinish- edinwrinklesrcy.Thefrontpanelisheavy brassfinishedinsatinchomeplatewithphoto- 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