资源描述：
《信号发生器的功能是什么_中英文翻译_毕业论文.doc》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。
1、WhatAretheFunctionsofaSignalGenerator?Whenanengineer,scientistortechnicianneedsathorough,reliablewaytoanalyzeanelectronicsystem,hemightreachforasignalgenerator.Itproducesanoscillatingsignalwithpreciselycontrolledfrequencyandamplitudecharacteristics,andisanindispensabletoolfortestin
2、gdifferenttypesofaudio,video,radioandothertypesofbroadcastequipment.DescriptionAsignalgeneratorisacommonpieceofelectronictestequipment.Itisaconvenientsourceoftime-varyingelectricalsignalswithknownwaveform,frequencyandamplitude.Itoffersseveralwaveformsofgoodqualitywithaccurateandsta
3、blefrequency.FeaturesAsignalgeneratorhascontrolstosetfrequencyrange,frequencyfinetuneandamplitude.Itwillhaveeitherawaveformselectorswitchorhavesimultaneousoutputsforafewdifferentwaveforms.Theonesmostfrequentlyofferedaresine,triangleandarectangularpulse.Somegeneratorswillhavearising
4、orfallingsawtoothwaveform.Adigitalgeneratormayhaveverylargeselectionsofpre-programmedwaveforms.Amoresophisticatedmodelhasamplitudeandfrequencymodulation,possiblywithabuilt-inmodulationoscillator.Ifitoffersmodulation,theremaybeaninputforanexternalmodulationsignal.PurposeOneofthemain
5、usesofsignalgeneratoristosendasignalintoacircuittotestit.Atechnicianlooksatthesignalatdifferentpointsinthecircuitwithanoscilloscope,spectrumanalyzerorotherequipment.Ifthesignalisdistorted,attenuatedormissingentirely,thiswilltellherwhatthecircuitisdoing.Itisusedtotestsystemsofequipm
6、ent,injectingapuresignalintoaradiotransmitter,forexample.Analyzingthereceivedsignalcantellalotaboutthequalityofbothtransmissionandreception.Asignalgeneratorcandrivemechanicalequipment,likeashaker.Ashakerisusedtovibratesomething,likeapieceofequipmentundertest.Ifthesignalgeneratordri
7、vestheshakerwitha20hertzsinewaveandtheequipmentfallsapart,thedesignersmighthavetoreworkittobesturdier.TypesAnaudiosignalgeneratorcoversthefrequencyrangeofhearingandismeantforworkonaudioequipment.Usually,ithasafrequencyrangegreaterthantheaudiorange,suchas1hertzto100kilohertz,totestt
8、hecircuitspasttheirnormalr
