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1、外文资料原文IntroductionofdigitalfrequencymeterDigitalFrequencyofcommunicationsequipment,audioandvideo,andotherareasofscientificresearchandproductionofanindispensableinstrument.ProgrammingusingVerilogHDLDesignandImplementationofthedigitalfrequency,inadditiontotheplasticpartoft
2、hemeasuredsignal,anddigitalkeyforapartoftheshow,allinanFPGAchiptoachieve.Theentiresystemisverylean,flexibleandhaveamodificationofthescene.1.AndotherprecisionmeasuringfrequencyPrincipleFrequencymeasurementmethodscanbedividedintotwokinds:(1)directmeasurementmethod,thatis,a
3、tacertaintimemeasurementgatemeasuredpulsesignalnumber.(2)Indirectmeasurements,suchasthecyclefrequencymeasurement,VFconversionlaw.FrequencyMeasurementindirectmeasurementmethodappliesonlytolow-frequencysignals.Basedontheprinciplesoftraditionalfrequencymeasurementofthefrequ
4、encyofmeasurementaccuracywillbemeasuredwiththedeclineinsignalfrequencydecreasesinthemorepracticallimitations,suchastheaccuracyandfrequencyofmeasurementnotonlyhashighaccuracy,butalsointhewholefrequencyregiontomaintainconstanttestaccuracy.Themainmethodofmeasurementfrequenc
5、ymeasurementPreferencesgatedsignalGATEissuedbytheMCU,GATEtimewidthonthefrequencymeasurementaccuracyoflessimpact,inthelargercontextofchoice,aslongastheFPGAin32of100inthecounterbMSignalsarenotoverflowline,inaccordancewiththetheoreticalcalculationGATEtimecanbegreaterthanthe
6、widthTc42.94s,butduetothesingle-chipmicrocomputerdataprocessingcapacityconstraints,theactualwidthoflesstime,generallyintherangeofbetween0.1schoice,thatis,high-frequency,shortergate;,lowgatelonger.ThistimegatewidthTcbasedonthesizeofthemeasuredfrequencyautomaticallyadjustf
7、requencymeasurementinordertoachievetheautomaticconversionrange,andexpandedtherangeoffrequencymeasurement;realizationoftheentirescopeofmeasurementaccuracy,reducethelow-frequencymeasurementerror. Thedesignofthemainmethodsofmeasuringthefrequencymeasurementandcontrolblock
8、diagramasshowninFigure1.Figure1PreferencesgatedsignalGATEissuedbytheMCU,GATEtimewidthoflessfrequencymea
