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1、浙江农林大学本科生毕业设计（论文）Labview-basedvirtualfunctionSignalGenerator1IntroductionSince1986,theU.S.NI(NationalInstrument)companiestotheconceptofvirtualinstrumentation,alongwithcomputertechnologyandmeasurementtechnology,virtualinstrumenttechnologyhasalsobeendevelopedrapidly.Virtualinstrumentmeans
2、:useoftheexistingPC,withaspeciallydesignedinstrumenthardwareandproprietarysoftware,theformationofthebasicfunctionsofboththeordinaryinstrument,thereareusuallynospecialequipmentfeaturesofthenewinstrument.Comparedwiththetraditionalinstrumentsofitsfeaturesare:bettermeasurementaccuracyandrep
3、eatability;measurementspeed;systemsetuptimeisshort;instrumentfunctiondefinedbytheuser;scalability;technicalupdatesandquick.Virtualinstrumentsoftwareasthecore,thesoftwarecompanyYouyiU.S.NILabviewvirtualinstrumentsoftwaredevelopmentplatformmostcommonlyused.Labviewisagraphicalprogrammingla
4、nguage,mainlyusedtodevelopdataacquisition,instrumentcontrolanddataprocessingandanalysissoftware,andpowerful.Currently,thedevelopmentofsoftwareintheinternationaltest,measurementandcontrolindustry,popular,measurementandcontrolareasinthecountryhasalsobeenwidelyused.FunctionGeneratorisascie
5、ntificresearchandengineeringdesigninawidelyusedgeneral-purposeequipment.ThefollowingfunctionsignalgeneratorwithavirtualdesignanddevelopmentofspecificdescriptionisbasedongraphicalprogramminglanguageLabviewvirtualinstrumentprogrammingandimplementationoftechnology.10浙江农林大学本科生毕业设计（论文）2virtu
6、alfunctionsignalgeneratorstructureandcomposition2.1VirtualFunctionGeneratorfrontpanelThisvirtualfunctionsignalgeneratormainlyconsistsofaPCIbus,multi-functiondataacquisitioncardandappropriatesoftware.TheminstalledonaPCrunningWindows95/98/2000/NTthemachine,shallconstituteapowerfulfunction
7、ofsignalgenerator.ThedesignofthevirtualfunctionsignalgeneratorreferencesignalgeneratorSG1645powerfunctions,frontpanelshowninFigure1.Figure1virtualfunctionsignalgeneratorfrontpanelThefunctiongenerator'sfrontpanelfunctionofthefollowingcomponents:instrumentcontrolbutton,theoutputf
