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1、外文资料原文TheDevelopmentofFrequencyMeterThefrequencymeterismainlycomposedoffourparts:thetimebase(T)countingcircuit,inputcircuit,displaycircuitandcontrolcircuit.Intheprocessofameasuringcycle,theperiodicsignaltobemeasuredintheinputcircuitafteramplification,plastic,differentialoperation
2、formaspecificperiodofnarrowpulse,aninputtothemaingate.Themaindoorofanotherinputtoobasecircuittoproducethegatecircuit.Duringthegateopeningthemaindoorofaparticularperiodofnarrowpulsecanthroughthemaindoor,tocountertocount,counterdisplaycircuitisusedtodisplaythemeasuredsignalfrequenc
3、yvalues,internalcontrolcircuitisusedtocompleteavarietyoffunctionsbetweentheswitchandimplementmeasurementsetup.Theapplicationrangeofthefrequencymeter:inthetraditionalelectronicmeasuringinstrument,theoscilloscopeinthelowmeasurementprecisionoffrequencymeasurement,errorisbigger.Spect
4、rometercanaccuratemeasurementanddisplayofthemeasuredsignalfrequencyspectrum,butthemeasurementspeedisslow,cannotreal-timefasttrackingtothechangeofthemeasuredsignalfrequency.Itisbecauseoffrequencymetercanfastaccuratetocatchthechangeofthemeasuredsignalfrequency,therefore,frequencyme
5、terhasveryextensiveapplicationscope.Electroniccounterisabasicmeasurementinstruments,sofarhasahistoryofmorethan30years.Early,designersgoalismainlytoexpandmeasuringrange,plusimprovethemeasurementaccuracy,stability,etc.,thesearepeoplemeasurethetechnologicallevelofelectroniccalculato
6、rs,decidedtoelectroniccounterthemainbasisoftheprice.Atpresentthebasictechniqueperfected,mature.Applicationofmoderntechnologycanbeeasilyexpandedelectroniccountermeasurefrequencylimittomicrowavefrequencies.Withthedevelopmentofscienceandtechnology,theuseralsoputsforwardnewrequiremen
7、tsforelectroniccounter.Forlow-gradeproductsrequirestheuseofconvenientoperation,widerange(enough),highreliability,lowprice.Fortheupscaleproduct,insistonahighresolution,highaccuracy,highstability,highmeasuringspeed;,besidesthefunctionsofgeneralcounterusuallyalsohavethefunctionofdat
8、aprocessingandstatisticalanalysis,time-d
