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1、中文1963字Labview-basedvirtualfunctionSignalGeneratorVMarozas,RJurkonis1IntroductionSince1986,theU.S.NI(NationalInstrument)companiestotheconceptofvirtualinstrumentation,alongwithcomputertechnologyandmeasurementtechnology,virtualinstrumenttechnologyhasalsobeendevelopedr
2、apidly.Virtualinstrumentmeans:useoftheexistingPC,withaspeciallydesignedinstrumenthardwareandproprietarysoftware,theformationofthebasicfunctionsofboththeordinaryinstrument,thereareusuallynospecialequipmentfeaturesofthenewinstrument.Comparedwiththetraditionalinstrumen
3、tsofitsfeaturesare:bettermeasurementaccuracyandrepeatability;measurementspeed;systemsetuptimeisshort;instrumentfunctiondefinedbytheuser;scalability;technicalupdatesandquick.Virtualinstrumentsoftwareasthecore,thesoftwarecompanyYouyiU.S.NILabviewvirtualinstrumentsoftw
4、aredevelopmentplatformmostcommonlyused.Labviewisagraphicalprogramminglanguage,mainlyusedtodevelopdataacquisition,instrumentcontrolanddataprocessingandanalysissoftware,andpowerful.Currently,thedevelopmentofsoftwareintheinternationaltest,measurementandcontrolindustry,
5、popular,measurementandcontrolareasinthecountryhasalsobeenwidelyused.FunctionGeneratorisascientificresearchandengineeringdesigninawidelyusedgeneral-purposeequipment.Thefollowingfunctionsignalgeneratorwithavirtualdesignanddevelopmentofspecificdescriptionisbasedongraph
6、icalprogramminglanguageLabviewvirtualinstrumentprogrammingandimplementationoftechnology.102virtualfunctionsignalgeneratorstructureandcomposition2.1VirtualFunctionGeneratorfrontpanelThisvirtualfunctionsignalgeneratormainlyconsistsofaPCIbus,multi-functiondataacquisiti
7、oncardandappropriatesoftware.TheminstalledonaPCrunningWindows95/98/2000/NTthemachine,shallconstituteapowerfulfunctionofsignalgenerator.ThedesignofthevirtualfunctionsignalgeneratorreferencesignalgeneratorSG1645powerfunctions,frontpanelshowninFigure1.Figure1virtualfun
8、ctionsignalgeneratorfrontpanelThefunctiongenerator'sfrontpanelfunctionofthefollowingcomponents:instrumentcontrolbutton,theoutputfrequencyc
