虚拟数字存储示波器中英文对照外文翻译文献Word下载.docx
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虚拟数字存储示波器中英文对照外文翻译文献Word下载.docx
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1.25MSPSdiskwritespeed;
±
0.05~±
10Vinputrange;
two-way12analogoutputs;
eightdigitalI/O.two-way24counter/timer.
Functionalequipment
Inthiscasevirtualdigitaloscilloscopewithreal-timedataacquisition,spectralanalysisandwindowtreatmentandfilteringcapabilities.Inthevirtualdigitaloscilloscopemainpanelondatacollectionandanalysisofthespectrum,andwindowprocessing,filteringandotherfunctionkeys,accordingtothecorrespondingbuttonwecanenterintotheappropriatesub-panel.
SoftwareDesignandImplementation
VirtualdigitaloscilloscopesoftwaredesignbasedontheuseofC-languageprogrammingenvironmentLabWindows/CVI.LabWindows/CVIsupportnumericaltype,Boolean,andthestringoftext,andotherdatatypes,butthebiggestadvantageisthroughdialogformsofinteractiveoperationsgeneratestandardCcode.InadditionLabWindows/CVIprovidesaveryrichdebugtools,includingsingle-step,breakpoints,variableview,monitorwindow,andsoon,thesefeaturesmaketheadjustmentprocesshasbecomemorevulnerable.
Themainfunctionmodules
Virtualdigitaloscilloscopemainlybythesoftwarecontrolsignalsthecompletionoftheacquisitionanddisplayprocessing,datacollectioninthemainpaneltocompletethefollowingfeatures:
Settingupaccess,setupsamplingfrequency,setupamannerthatwaveform,datacollectioninthemainpaneltocompletethefollowingFeatures:
Acquisitionofreal-timesignalandthesignalonitsownspectrumanalysis,seelines,andotherfunctions,andwindowpanelsdealingwiththeacquisitionofreal-timesignalandthesignaltoincreaseprocessingwindows(includingwindowsHaiming,Hammingwindow,Buiakeansmoothingwindowsandwindow,etc.).Filteringinhandlingpanelincludesthefollowingfeatures:
theacquisitionofreal-timesignalandthesignalonitsownfilteringtreatment(includingsingle-stepfiltering,multi-stepfilteringmethodandtraditionalmethods,etc.)
Thesourcefilesgeneratedwhenthecontrolpaneltocompletetheset,youcanhaveafunctionofthecodeofprocedure.Specificmethodsfor:
tohavecompletedthepanelasaresponsetothecurrentstateofthe[Code]menu,select[Generate]inthe[AllCode],inthepop-updialogfunctionselectedinthemainpanelandwithdrawfromthefunction,Andtheuserinterfacewillbeabletoproducedocumentsrelativetotheframeworkofthecodefunction.
Addthecodegeneratedautomaticallysteponthecorrespondingcontrolisafunctionoftheframework,tomakecertaincontrolstocompletethefunction,wemustaddcodetocontrolthecontrols.Onemain()functionistheentranceprocedures,itisthefunctionofinitializationprocedures,loadingtheuseranddisplaypanels,suchastocompleteotherfunctionsrequiredtoaddcode.Followingthecodefordataacquisitionfunctions,dataacquisitionprocessbycallingthecallbackfunctionbuttonSHOUexternalacquisition.
Softwaredevelopmentenvironment:
virtualdigitaloscilloscopesoftwaredesignbasedontheuseofC-languageprogrammingenvironmentLabWindows/CVI.LabWindows/CVIsupportnumericaltype,Boolean,andthestringoftext,andotherdatatypes,butthebiggestadvantageisthroughdialogformsofinteractiveoperationsgeneratestandardCcode.InadditionLabWindows/CVIprovidesaveryrichdebugtools,includingsingle-step,breakpoints,variableview,monitorwindow,andsoon,thesefeaturesmaketheadjustmentprocesshasbecomemorevulnerable.
Havethefunction
★functionwithreal-timedisplay:
AcquisitionAcquisitionsignaltotheinputsignalandreal-timedisplayinaPCterminal.
★digitalfiltering:
IIRfilterontheuseofdigitalsignalprocessingandreal-timefiltering,atthesametimefiltercanbesetupinthebestapproximationfunctiontype,filtertype,order,fromtoptobottomcut-offfrequency,andotherparameters.
★latestwaveshow:
tomeetthetransientwaveformdisplay,butcanalsobetransientwaveformtobesaved.
★waveformstorage:
atanytimeaftertheoriginalsignalorsignalstotheLVMLabVIEWuniquefileformatstoredonthelocalharddrive,forfutureanalysisorprocessing.Onetransientsignaltothecut-offwaveafterBMPformatimagesstoredinlocalhard上供viewandanalysisofthefuture.
★significantwaveback:
tokeepthememoryoftheLVMformatwaveformre-readthedocumentandthendisplayedonaPCclient.
★spectrumanalysis:
Afterthefilterfrequencysignalrespectivelycorrespondinganalysisandresponseanalysisofthefrequencyandwaveatthesametimetoshowreal-timemannerandform.
Basicprinciples
theuseofhardwareacquisitioncardacquisitionsignals,usingsoftwareprovidedbyNIDAQmxREADacquisitionsignals,andthenthroughWaveformGraphstoconductreal-timedisplay.Thishasabasicoscilloscope,signalshowedthatafterusingWriteToMeasurementFilewaveformwillbesavedasLVMdocuments.Thisrealizationofthebasic"
store"
function,butthroughReadToMeasurementFilecanbereadLVM,thuscompletingthe"
echo"
feature.AsthehardwareandtheacquisitionofPC-card-based,sothelimitofsamplingoscilloscopesintherate,bandwidth,resolution,andotherparametersislimited.AndproceduresontheresponsetimeisdependentonthePC'
sconfigurationandproceduresfortheimplementationofefficiency.
Themainfunction:
DAQmxRead,DigitalIIRFilter,WaveformGraphs,WriteToMeasurementFile,ReadToMeasurementFile,andothermajorfunction.
CustomizingtheWaveformGraph
Thewaveformgraphindicatordisplaysthetwosignals.Toindicatewhich
plotisthescaledsignalandwhichisthesimulatedsignal,youcustomize
theplots.Completethefollowingstepstocustomizetheappearanceofan
indicatoronthefrontpanel.
1.Movethecursoroverthetopoftheplotlegendonthewaveformgraph.
Noticethatwhiletherearetwoplotsonthegraph,theplotlegend
displaysonlyoneplot.
2.Whenadouble-headedarrowappears,showninFigure1-11,clickand
dragtheborderoftheplotlegenduntilthesecondplotnameappears.
Figure1-11.ExpandingaPlotLegend
3.Right-clickthewaveformgraphandselectPropertiesfromthe
shortcutmenutodisplaytheGraphPropertiesdialogbox.
4.OnthePlotstab,selectSawtoothfromthepull-downmenu.Clickthe
LineColorcolorboxtodisplaythecolorpicker.Selectanewline
color.
5.SelectSawtooth(Scaled)fromthepull-downmenu.
6.PlaceacheckmarkintheDon’tusewaveformnamesforplotnames
checkbox.
7.IntheNametextbox,deletethecurrentlabelandchangethenameof
thisplottoScaledSawtooth.
8.ClicktheOKbuttontoapplythecurrentconfigurationandclosethe
GraphPropertiesdialogbox.
Noticehowtheplotcoloronthefrontpanelchanges.
9.ExperimentwithotherpropertiesofthegraphbyusingtheGraph
Propertiesdialogbox.Forexample,trydisablingtheautoscalefeature
locatedontheScalestab.
10.ClicktheCancelbuttontoavoidapplyingthechangesyoumadewhile
experimenting.Ifyouwanttokeepthechangesyoumade,clickthe
OKbutton.
11.SaveandclosethisVI.
SavingDatawhenPromptedbyaUser
CompletethefollowingstepstobuildaVIthatlogsdatatoafilewhenthe
userclicksabuttononthefrontpanel.
1.Ontheblockdiagram,double-clicktheWriteLabVIEWMeasurement
FileExpressVItoaccesstheConfigureWriteLabVIEW
MeasurementFiledialogbox.
2.Changethefilenametest.lvmtoSelectedSamples.lvminthe
Filenametextboxtosavethedatatoadifferentfile.
3.ClosetheConfigureWriteLabVIEWMeasurementFile
dialogbox.
4.Right-clicktheSignalinputoftheWriteLabVIEWMeasurementFile
ExpressVI.SelectInsertInput/Outputfromtheshortcutmenuto
inserttheCommentinput.
5.Right-clicktheCommentinputoftheWriteLabVIEWMeasurement
FileExpressVI.SelectSelectInput/Output»
Enablefromthe
shortcutmenutoinserttheEnableinput.
Inthepreviousexerciseyoulearnedtoaddinputsandoutputsby
expandingtheExpressVIusingthedownarrows.Noticethatthis
methodisadifferentwayofdisplayingandselectingtheinputsand
outputsofanExpressVI.
TheinputsandoutputsofanExpressVIappearinapredetermined
orderwhenyouaddnewinputsandoutputs.Toselectaspecificinput,
youmayneedtoaddaninputfirst,thenchangetheinputtothespecific
oneyouwanttouse.
6.MovetheWritetoFileterminaltotheleftoftheWriteLabVIEW
MeasurementFileExpressVI.
7.WiretheWritetoFileterminaltotheEnableinputoftheWrite
LabVIEWMeasurementFileExpressVI.
TheblockdiagramshouldappearsimilartoFigure2-6.
Figure2-6.BlockDiagramfortheSaveDataVI
8.DisplaythefrontpanelandruntheVI.ClicktheWritetoFilebutton
severaltimes.
9.ClicktheSTOPbuttononthefrontpanel.
10.Toviewthedatayousaved,opentheSelectedSamples.lvmfile
withaspreadsheetorwordprocessingapplication.
NoticehowtheSelectedSamples.lvmfilediffersfromthe
test.lvmfile.test.lvmrecordedallthedatageneratedbytheSave
DataVI,whereasSelectedSamples.lvmonlyrecordedthedata
whenyoupressedtheWritetoFilebutton.
11.
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