数字电压表【外文翻译】

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1、毕业设计（论文）外文翻译原文题目：DIGITALVOLTMETERDIGITALVOLTMETERBACKGROUNDOFTHEINVENTIONThisinventiongenerallyrelatestovoltagemeasurementdevices,andmoreparticularlytodigitalvoltmeterscapableofmeasuringACandDCvoltageswithautomaticselectionofthepropermeasurementfunctionsoastoprovideasafeme

2、asuringinstrument.Thedigitalvoltmeteroftheinventionmayalsoprovideameasuringinstrumentwhichissubstantiallyinsensitivetotheeffectsofdistributedcapacitance,foraccurateandreliablevoltagemeasurement.Manysituations,fromcheckingandtestingofelectricalserviceinstallationstochecking

3、theintegrityofresidentialwiring,requiretheuseofvoltagemeasuringequipmentcapableofmeasuringthemagnitudeofanAClinevoltage,DCvoltageorcombinationthereof.Itshouldbeevidentthatintheverificationofelectricalservicevoltage,veryhighvoltagesmaybeencountered,makingroutinepowermeasure

4、mentapossiblydangerousactivity.Forprovidingsuchmeasurementcapabilities,therehavebeendevelopedanumberofAC/DCvoltagereadingvoltmetersormufti-functionmetersadaptedtomeasurevoltageinconjunctionwithotherelectricalparameters.Inthisrespect,variousACandDCanalogvoltmetershavebeende

5、velopedwhichoperatewithagalvanometertypemeterstoindicatethemagnitudeofthevoltagebeingmeasured.Manyoftheseanalogtypeinstrumentsaredeficientinthattheyhavelowinputimpedanceandthereforerequireasubstantialamountofelectricalcurrenttodeflectthemeter,whichwilldistortthevoltagemeas

6、urementinmanycases.Digitalvoltmetershavealsobeendevelopedwhichmayavoidtheinaccuracyofsomeanalogmeters,butinturnhaveotherrecognizeddeficiencies.Bothanaloganddigitalvoltmetersaresubjecttoinaccuracy,arebulky,fragileandtheuserthereofispossiblydangerous.Manysuchmetersincluderan

7、geandfunctionselectionswitcheswhicharemanipulatedbytheuser.Thevoltmetermustbecapableofmeasuringvoltagesoverawiderangeofmagnitudes,whichwillrequiretheusertohaveknowledgeofwhatvoltagesaretobeexpected.Ifthewrongfunctionorrangeisselectedonavoltmeter,thereisthepossibilitythatan

8、over-voltagecouldcausethemeasuringinstrumenttoexplodeuponapplicationtoavoltagesource.Addi