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1、中文1963字Labview-basedvirtualfunctionSignalGeneratorVMarozas,RJurkonis1IntroductionSince1986,theU.S.NI(NationalInstrument)companiestotheconceptofvirtualinstrumentation,alongwithcomputertechnologyandmeasurementtechnology,virtualinstrumenttechnologyhasalsobeendevelopedrapidly.Virtualinstrumentmeans:us
2、eoftheexistingPC,withaspeciallydesignedinstrumenthardwareandproprietarysoftware,theformationofthebasicfunctionsofboththeordinaryinstrument,thereareusuallynospecialequipmentfeaturesofthenewinstrument.Comparedwiththetraditionalinstrumentsofitsfeaturesare:bettermeasurementaccuracyandrepeatability;mea
3、surementspeed;systemsetuptimeisshort;instrumentfunctiondefinedbytheuser;scalability;technicalupdatesandquick.Virtualinstrumentsoftwareasthecore,thesoftwarecompanyYouyiU.S.NILabviewvirtualinstrumentsoftwaredevelopmentplatformmostcommonlyused.Labviewisagraphicalprogramminglanguage,mainlyusedtodevelo
4、pdataacquisition,instrumentcontrolanddataprocessingandanalysissoftware,andpowerful.Currently,thedevelopmentofsoftwareintheinternationaltest,measurementandcontrolindustry,popular,measurementandcontrolareasinthecountryhasalsobeenwidelyused.FunctionGeneratorisascientificresearchandengineeringdesignin
5、awidelyusedgeneral-purposeequipment.ThefollowingfunctionsignalgeneratorwithavirtualdesignanddevelopmentofspecificdescriptionisbasedongraphicalprogramminglanguageLabviewvirtualinstrumentprogrammingandimplementationoftechnology.102virtualfunctionsignalgeneratorstructureandcomposition2.1VirtualFuncti
6、onGeneratorfrontpanelThisvirtualfunctionsignalgeneratormainlyconsistsofaPCIbus,multi-functiondataacquisitioncardandappropriatesoftware.TheminstalledonaPCrunningWindows95/98/2000/NTthemachine,shallconstituteapowerfulfunctionofsignalgenerator.Thedesignofthevirtualfunctionsignalgeneratorreferencesign
7、algeneratorSG1645powerfunctions,frontpanelshowninFigure1.Figure1virtualfunctionsignalgeneratorfrontpanelThefunctiongenerator'sfrontpanelfunctionofthefollowingcomponents:instrumentcontrolbutton,theoutputfrequencyc
