虚拟数字存储示波器中英文对照外文翻译文献.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

中英文资料外文翻译文献

（文档含英文原文和中文翻译）

Virtual-digitalstorageoscilloscope

Virtualdigitalstorageoscilloscope-thestructureandcomposition：

VirtualdigitaloscilloscopePXIbusfromamulti-functionaldataacquisitioncardandthecorrespondingsoftware.TheywillbeinstalledonaPCrunningWindows,constitutesapowerfulcanstoredigitaloscilloscope.

DataAcquisition

ThedesignofNIisusedbythecompany'smulti-purposedataacquisitioncardPXI-6670E,itsmainfunctionsareasfollows:

64-waysingle-ended/32-waydifferentialanaloginput;12accuracy;1.25MSPSsamplingspeed;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.