lecroy 16_LTXXX-OM-E_Ch12 电路图.pdf

160ISSUED: January2002LTXXX-OM-E Rev B CH A P T E RTW E L V E:UseWaverunnerwithPC Operate yourWaverunnerscope using a personalcomputer. Inthis chapter, see how Totransferwaveforms and data fromscope tocomputer TomonitorWaverunnerremote controloperation Tosave inASCII Touse WaverunnerwithSpreadsheet, Mathcad and MATLAB RadioFans.CN 收音机爱 好者资料库 LTXXX-OM-E Rev BISSUED: January2002161 CH A P T E RTW E L V EUseWaverunnerwithPC TransferDataandImagestoPC Connect theWaverunner toapersonal computer (PC)throughtheoscilloscopes rear GPIB or RS-232-C port. ThenuseLeCroys handyScopeExplorer software(seenext page)to savedataor images tothe PCs harddisk. At thesametime, theWaverunners RemoteControl Assistant canmonitor anddebugall your remotecontrol communications (seepage163). But first, followthesesteps toset upthescopefor communicationwiththePC: 1.Press UTILITIES andthenthebuttonfor 2.Usethesemenus toset upcommunicationwiththePC viaGPIB or RS232. Toselect GPIB or RS232. Select from theother menus accordingtothis. RS232: Press toselect seven- or eight-bit wordlengthfor RS232. With RS232selectedabove, theGPIB interfaceis “talk-only.” Anychangeis immediate. RS232: Press tochoosetheappropriateRS232 parity. RS232: Press toselect thenumber of stopbits for RS232. RS232: Turntheknobtoset theBaudRatefor RS232. GPIB: Press or turntoselect theGPIB address. RadioFans.CN 收音机爱 好者资料库 PA R TTW O:L O O K I N GD E E P E R 162ISSUED: January2002LTXXX-OM-E Rev B NOT CONNECTED11 2 33 2 NOT CONNECTED99 7 8 7 8 4 5 6 4 5 6 ALL INPU TS 50 5Vrms 1M 16pF 400Vpk C AT II C AL CHANNEL OFFSET MATH RESET TOOL S STATUS SC OPE M EASURE TOOLS ZOOM CLEAR SWEEPS PRINT SC REEN WAVE STORAGE UTILITIES PANELS DISPLAY STANDBY SELECT POSITIONPOSITION ZOOM TIME / DIV ZER O DELAYSETU PSTOPAUTONOR MAL SINGLE AUTO SETU P DELAYLEVEL VOLTS / DIV VmVnss RETU RN ZOOM + MATH TRIGGER SETUP TIMEBASE ANALOG PER SIST RS-232 nine-pin communication cabling for connecting Waverunner to PC. EXPLORE YOUR SCOPE ScopeExplorer is aneasy-to-useandpractical softwaretool for interfacingyour Waverunner oscilloscopewith computers runningWindows. (Seealso“First Things” section.) 1.Connect thescopetoaPC byusingeither theGPIB youll needaPC withGPIB cardinstalled or PC-standardRS-232-C port onthescopes rear panel. 2.DownloadScopeExplorer freeat Or inquireat your LeCroy customer servicecenter. 3.HavinginstalledScopeExplorer, openit as youwouldanyWindows program. Useits on-linehelpto: Usetheteletype-liketerminal to sendstandardremotecontrol commands from computer to oscilloscope. AnddisplaytheWaverunner responseonthePC. Control thescopeusinganinteractive, virtual scopefront panel! Pipesequences of commands from afiletothescope, then sendthescopes responses toanother file. (SeetheRemote Control Manual for thecommands.) Transfer pixel-for-pixel copies of your Waverunner displaytoPC, viewthem, print them, or both from thecomputer. Withasinglepress of abuttonor key, youcancopybitmapwaveform images to theWindows Clipboard, readytopasteintoanyWindows application. CaptureWaverunner front panel setups andstorethem on thecomputer withalengthyfilename. You canthentransfer them backinto thescopetoreproduceanidentical setup. Transfer, too, your waveforms toPC, andstorethem ineither thecompact LeCroyBinaryformat, or anASCII versioncompatiblewithPC-basedanalysis products suchas Microsofts Excel or Mathsofts MathCad(seepage164). RadioFans.CN 收音机爱 好者资料库 CH A P T E RTW E L V E:UseWaverunnerwithPC LTXXX-OM-E Rev BISSUED: January2002163 MONITOR YOUR REMOTE CONTROL OPERATIONS UsetheWaverunner RemoteControl (RC)Assistant toautomaticallymonitor remotecommands received throughtheGPIB andRS232 ports. RC Assistant helps debugcommunications withthePC. Whenactivated, it displays alogof thedialogbetweenoscilloscopeandPC. Andwhenever acommunicationerror occurs, it gives theadditional message“RemoteControl: problem detectedandlogged.” 1.Press UTILITIES todisplaytheUTILITIES menus. 2.Press thebuttonforthenthebuttonfor Thesemenus will appear: 3.Press either of thetoptwomenubuttons toselect oneof the following: Off theRC Assistant willNOTcaptureanyremotecommands. Errors Only displays onlywrongor incompletecommands receivedviaanyremotecontrol port (default after power-on). FullDialog captures all remotecommands receivedviaany remotecontrol port anddisplays upto100 lines of dialog, after whichlines areoverwrittenona“firstin, firstout” basis. RS232Also logs thefull dialogandsends it toarecordingdevice connectedtotheRS-232 port. Whenthis is used, commands can onlybereceivedviatheGPIB port. (Seealsothecommands COMM_HELP andCOMM_HELP_LOG in theRemote Control Manual.) 4.Turnthis knobtoenablelogscrolling; press this buttontoclear thelogentirely. PA R TTW O:L O O K I N GD E E P E R 164ISSUED: January2002LTXXX-OM-E Rev B SaveWaveformsinASCII Whenyousavewaveforms toaWaverunner internal memory(M1, M2, M3, or M4)yousavethem inLeCroys special binaryformat. But youcanalso storeyour waveforms in ASCII format toaportablestoragedevice suchas floppydisk, PC memorycardor harddiskcard. Youcanthentransfer thedatatoaPC for analysis with spreadsheet or mathsoftware. Indoingthis youwill createanoutput filerequiring1020 times thediskspaceof theoriginal LeCroybinary file. A one-megabyterecordwill typicallytakeup1315 MB whenstoredinASCII. AndASCII waveforms cannot berecalledbackintothescope. TheWaverunner stores waveforms inanyof threeASCII formats: Spreadsheet, MathCad, or MATLAB. The followingtablesummarizes theformat of thethreebasic layouts. Youll seehowtoset uptosaveinASCII on thenext pages, followedbyexamples of theuseof eachformat. FORMATHEADER Format includes some form of header before the data TIME VALUES Format stores time values with each amplitude value AMPLITUDE VALUES Format stores amplitude values SEQUENCE TIMES Header contains sequencetime information for each sequence segment MULTI- SEGMENT Format concatenates multiple segments of a sequence waveform DUAL ARRAY Format allows dual-array data (E xtrema or complex FFT) to be stored SpreadsheetYesYesYesYesYesYes MathCadYesYesYesYesYesYes MATLABNoNoYesNoYesNo CH A P T E RTW E L V E:UseWaverunnerwithPC LTXXX-OM-E Rev BISSUED: January2002165 SAVE IN AN ASCII FORMAT Storewaveforms inASCII andsavethem toafloppydiskor optional storagedeviceinthePC Cardslot. Save inanASCII dataformat suchas Spreadsheet. Thentransfer thedatatoPC. 1.Press WAVE STORAGE andthenthebuttonfor 2.Pressthebuttontoselect 3.Thenusetheseandthemenus onthenext pagetosaveyour displayed waveform toastoragedeviceinanASCII dataformat. Toselect ASCII. Next, toaccess themenushown onthenext pageandsetupfor the preferredASCII format. Toselect or turnoff automatic storingfeatures: Wrapstores continuously, discardingtheoldest files onafirst-in: first-out” basis. Fill stores until thestoragedeviceis full. Tosavethewaveform selectedtotheportablestoragedeviceusingthe menus below . Toselect thememoryinwhichthewaveform todisplayis stored. Toselect thestoragedeviceonwhich thewaveform will bestored: floppydisk(Flpy)is standardonall Waverunner models, whileaPC memorycardor harddisk cardintherear PC Cardslot (Card)is anoption. PA R TTW O:L O O K I N GD E E P E R 166ISSUED: January2002LTXXX-OM-E Rev B This menuis displayedwhenyouselect SetupASCII Format from themenus shown ontheprevious page. Toselect anASCII format. RETURN TogobacktotheSTORE WFORM menuandmakeother selections. CH A P T E RTW E L V E:UseWaverunnerwithPC LTXXX-OM-E Rev BISSUED: January2002167 UseASCII Formats SAVE TO SPREADSHEET Toreadawaveform storedintheSpreadsheet format intoMicrosoft Excel, use: File- Opendialog: Excels Text Import Wizardwill takeyouthroughthefollowingsteps: PA R TTW O:L O O K I N GD E E P E R 168ISSUED: January2002LTXXX-OM-E Rev B 1.SelectDelimited. 2.TheSpreadsheet format generatedbyWaveRunner uses “,” todelimit columns. SelectComma. as the delimiter. 3.Thethirdandfinal stepallows youtospecifythe format of thecolumns. Select theGeneralColumn dataformat (thedefault). CH A P T E RTW E L V E:UseWaverunnerwithPC LTXXX-OM-E Rev BISSUED: January2002169 4.ClicktheFinishbutton: adisplaysimilar tothis onewill beshown: PA R TTW O:L O O K I N GD E E P E R 170ISSUED: January2002LTXXX-OM-E Rev B PLOT A WAVEFORM IN SPREADSHEET Plottingthedatafrom awaveform will demandascatter plot basedonthedatainthefirst twocolumns, with thefirst columnusedas theX values (from row6 inthis example): Theheader createdfor thespreadsheet contains all theinformationyoull needtoextract various elements from asequencewaveform. Usethefollowingformulaetoextract informationsuchas thestart andendrowof thedatafor agivensegment, or thetrigger timeof agivensegment: SegmentStartRow := (DesiredSegment * D2)+ B2 + 5 SegmentE ndRow := SegmentStartRow+ D2 1 TrigTime= INDIRECT(ADDRESS(DesiredSegment +3;2;4) TimeSinceFirstTrig= INDIRECT(ADDRESS(DesiredSegment +3;3;4) Plottingthedatafrom all segments usingascatter plot will result inall segments overlaid, as inthe Waverunners persistencedisplayof sequencetraces. CH A P T E RTW E L V E:UseWaverunnerwithPC LTXXX-OM-E Rev BISSUED: January2002171 USE MATHCAD Theseexamples werecreatedusingMathSofts MathCadfor Windows. Shownonthis pageis theprocedurefor readingandgraphingafilefor asinglesegment; theexampleon page172 is for multiplesegments. This single-segment example is validfor MathCadVersions 3.1 to7: PA R TTW O:L O O K I N GD E E P E R 172ISSUED: January2002LTXXX-OM-E Rev B This multi-segment MathCad example demonstrates howtoextract datafrom agiven segment. Thedata consistedof twosegments of threesamples each, allowingtheentireimportedmatrixto beshown: CH A P T E RTW E L V E:UseWaverunnerwithPC LTXXX-OM-E Rev BISSUED: January2002173 USE MATLAB This examplewas createdusingMathWorks MATLAB Version4.2c.1 for Windows. Youcanreadandgrapha waveform in MATLAB byusingtwo simplecommands: thefirst loads thefileintoamatrixautomatically namedafter thefile(commandwindow); thesecondplots this matrix(“FigureNo. 1”): TheMATLAB format is simple: it has no header information, onlyamplitudevalues. Multiplesegments will be appendedwithout aseparator. Onlyonevaluefrom thepair of amplitudevalues present inadual-arraywill be stored. 174ISSUED: January2002LTXXX-OM-E Rev B BLANK PAGE