lecroy 05_LTXXX-OM-E_Ch1 电路图.pdf

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1、LTXXX-OM-E Rev BISSUED: January200215 P P A AR RT T O ON N E E G GE E T T T T I I N N G G S ST T A AR R T T E E DD This part ofthe manualcovers the mainWaverunnerfeatures and explains, stepbystep, howtouse them. Youllget toknowyourscope and start working withit quicklyand effectively. Capture and vi

2、ew waveforms. Zoomand scroll. Learntheart ofdisplay. Use mathand measurement tools. Document yourwork. RadioFans.CN 收音机爱 好者资料库 16ISSUED: January2002LTXXX-OM-E Rev B CH A P T E RON E:CatchaNewWave Inthis chapter, see how Toselect the input signalchannel Touse menus and controls forbasic operations To

3、find yourwayaround the display Toadjust the timebase, gainand positionof the signal Tozoom manuallyand automatically Toset upthe timebase Toset signalcoupling Tocalibrate and use the passive probe Toset upthe CAL and BNC outputs RadioFans.CN 收音机爱 好者资料库 LTXXX-OM-E Rev BISSUED: January200217 CH A P T

4、E RON ECatcha NewWave ViewYourWaveform Takethesesteps tocaptureandviewyour signal; set timeandvolts per division; zoom andauto-scroll: 1.Connect your signal totheWaverunner (Channel 1 input for this example). 2.Press theblue AUTO SETUP button toautomaticallyset the(Edge)trigger level, timebase, andv

5、ertical settings for displayof theinput signal. Press it againtoconfirm theaction. 3.Press 1 toselect CHANNEL 1 anddisplaythebasic Waverunner menus. 4.Usethesemenus inthesteps on thefollowingpages toadjust thesignals trace onthescreen. ToturnChannel 1 on or off. T TI IP P: : Press1twice toturnthe ch

6、annelonoroff. Toaccess theCHANNEL Couplingmenus. Seepage24. Toautomaticallymakeazoomedtraceof thesignal. Usethevertical POSITION knobtomovethetracesothat it is clearlyvisible. Usethe vertical ZOOM knobtoadjust its expansionvertically. Seepage22. Toautomaticallyset gainand offset, and“find” thesignal

7、. Toselect fixedor variablegain. Select “variable” tocontrol thechannels gaincontinuously. Seepage20. T TI IP P: : WithAUTO SETUP you canautomaticallyset upsignals inthe 5mV to40V range witha frequencyof 50Hz and a dutycycle as smallas 0.1%. Toselect thegridstyleandnumber. Next page: Single grid. Se

8、ealsoChapter 3, “Display Your Signal.” RadioFans.CN 收音机爱 好者资料库 PA R TON E:G E T T I N GS T A R T E D 18ISSUED: January2002LTXXX-OM-E Rev B TOFIN DYOURWAY AROUN D T H EWAVE RUN N E RDISPL AY Real-Time Clock field:powered by a battery-backed real-time clock, it displays the current date and time. Disp

9、layed Trace Labelindicates each channel or channel displayed, the time/ div and volts/ div settings, and cursor readings where appropriate. Acquisition Summary field:timebase, volts/ div, probe attenuation, and coupling for each channel, with the selected channel highlighted. CH A P T E RON E:Catcha

10、 NewWave LTXXX-OM-E Rev BISSUED: January200219 Trigger Levelarrows on both sides of the grid that mark the trigger voltage level relative to ground level. Trigger Delayis an arrow indicating the trigger time relative to the trace. Trigger Status fieldshows sample rate and trigger re-arming status (A

11、U TO, N ORMA L , SIN GL E , STOPPE D). The small square icon flashes to indicate that an acquisition has been made. Trigger Configuration fieldcontains an icon indicating the type of trigger, and information on the triggers source, slope, level and coupling, and other information when appropriate. T

12、race and Ground L evelshows the trace number and ground level marker. Other display areas include theTime and Frequency field, located below the grid and stating time and frequency relative to cursors, and aMessage fieldplaced above the grid and reserved for special messages. For more about the disp

13、lay, see Chapter 3, “Display Your Signal.” USE TIME/DIV TO ADJUST THE TIMEBASE 5.Turn TIME / DIV sns toadjust thetimebaseas desired. N NO OT TE E: : AUTO SETUP operates only onchannels that are turned on, unless nochannels are turned on. Thenallchannels willbe affected. Whenmore thanone channelis tu

14、rned on, the first channelin numericalorderwitha signal applied toit willbe automatically set upforedge triggering. Thetimeper divisionis set ina125 sequence. Waverunner automaticallyadapts itself tousethemaximum samplingratewhenever thetimebaseis changed. Theselectedtime/div settingis showninthetra

15、celabel at the topleft portionof thescreen, andthesamplingrateinthetrigger status fieldat thebottom right-handcorner. PA R TON E:G E T T I N GS T A R T E D 20ISSUED: January2002LTXXX-OM-E Rev B ADJUST SENSITIVITY AND POSITION 6.Turn VOLTS / DIV VmV toreducetheverticalgain sensitivity.Thevolts/div se

16、ttingis showninthe Channel 1 tracelabel. Thenext two steps canbetaken(if not already)whenyou wishtofinetunethevertical gainandget abetter vertical resolution: 7.Finetunethevertical gainbyselecting“variable” from theGainmenu(seepage17). 8.NowturntheVOLTS / DIV knob throughseveral completerotations, s

17、othat theentiresignal reaches from topto bottom of thegrid. Fillingthegridinthis way, youcanusethefull rangeof availabledigitizing levels. T TI IP P: : Press UTILITIES toselect Special Modes. Thenselect the Channels menu tochoose In: toset the offset of a gain (VOLTS/DIV) change involts orvertical d

18、ivisions (this is involts, bydefault). Automatic Recalibration: toturnthis feature onoroff (default is “On”). “Off” mayspeed capture, but time calibrationis not certainduring the capture period. GlobalBWL: tocontrolthe global bandwidthlimit. WhenOn, the chosen bandwidth(see page 24) applies toall ch

19、annels. WhenOff, a bandwidthlimit canbe set individuallyforeachchannel. 9.Use OFFSET tocenter thewaveform onthegrid. ZOOM AND SCROLL AUTOMATICALLY UseZOOM toseemoredetail onyour signal. Thedisplaywill showtheoriginal signal andits zoomedcopy. 10. Press A todisplaytheTRACE A menus (todisplayTraceB, C

20、, or D, press its button). 11. Press A againor thetopbuttontodisplaythetraceandits label. (Dothesametoturnoff atrace.) 12. Press thebuttonfor: Themenus shown onthenext pagewill bedisplayed. T TI IP P: : Togobacktothe default power-up settings, simultaneouslypress the second and fifthmenu buttons fro

21、mthe top, and the 1 CHANNEL SELECT 1button. CH A P T E RON E:Catcha NewWave LTXXX-OM-E Rev BISSUED: January200221 13. Usethesemenus toscroll backandforththroughthefull length of oneor all of your zoom copies. MULTI-ZOOM unifies thecontrol of all zoom traces, whileAUTO-SCROLL walks thezoom traceor tr

22、aces across thereferencedtrace. WhenOff, onlytheactivezoom traceis controlled. WhenOn, all displayedzoom traces (A, B, C, D)aresimultaneouslycontrolled (automatically)with AutoScroll and(manually)withthehorizontal ZOOM andPOSITION knobs. Seethenext pagefor moreon Multi-Zoom. Toscroll thezoom tracefr

23、om right toleft of screen. Whenplaying, themenuis labeled“STOP (PLAYING)”: Press tostop. Toscroll thezoom tracefrom left toright of screen. Whenplaying, themenuis labeled“STOP (REVERSING)”: Press tostop. Toscroll bydivisions per secondor number of divisions.Usediv/s to scroll continuouslyfor viewing

24、.Usenumberof divfor waveform processing,especiallyPass/Fail testing. Whenprocessingiscomplete, thedisplaywill beupdatedbythenumber of divisions set. Toset scroll speed, usingtheknob. Whenscrollingby divisions, 10 div will stepthezoom trace“grid-page” by “grid-page” across thelength of thereferencedt

25、race. ToreturntotheTRACE A menus, whilecontinuingto scroll, bypressingthemenubutton. RETURN Tostopscrollingandreturntotheprevious menudisplayed. T TI IP P: : Considerzoomas anextra timebase that offers alternative sweepspeeds. You candisplayas many as fourzooms at once. PA R TON E:G E T T I N GS T A

26、 R T E D 22ISSUED: January2002LTXXX-OM-E Rev B USE THE POSITION AND ZOOM CONTROLS 14. Turn POSITION to placeTraceA verticallyonthegrid. T TI IP P: : The smallerWaverunnerknobs are rate sensitive: the fasteryou rotate them, the greaterthe change that results perincrement. Whenusingmorethan onegrid, t

27、urnPOSITION tomovetraces from onegridtoanother. 15. Turn ZOOM toadjust theexpansionfactor andincreasetheamount of zoom. 16. Turn POSITION tomovethezoomedregionof thetrace. 17. Turn ZOOM toverticallyexpand, or reduce, thezoom trace. TOZOOM AN DMUL T I-ZOOM You can zoom several traces from a single wa

28、veform to obtain precise timing measurements and improve the time resolution on your displayed waveform. For instance, on a waveform composed of two pulses separated by a long delay, you could make Trace A a zoom of the first pulse, and Trace B a zoom of the second. Multi-Zoomallows you to move the

29、zoomed region of the waveform along two or more different traces, or two or more regions of the same trace, simultaneously. When you activate multi-zoom, the horizontal zoom and position controls apply to all displayed traces A , B, C, and D allowing you to view similar sections of different traces

30、at the same time. The vertical sensitivity controls still act individually on the traces. When trace labels have dotted top and bottom edges, like the one at right, this indicates that their traces are multi-zoomed. CH A P T E RON E:Catcha NewWave LTXXX-OM-E Rev BISSUED: January200223 SET UP THE TIM

31、EBASE 18. Press SETUP TIMEBASE andaccess theTIMEBASE menus. 19. Usethesemenus toset upthetimebaseinsingle-shot mode. SeeChapter 7, “A Question of Timebase,” for moreonthesamplingmodes. Single-Shotsamplingdisplaysdatacollectedduringsuccessivesingle-shot acquisitionsfromtheinput channels capturenonrec

32、urring,or verylow repetition-rateevents,simultaneouslyonallinput channels. Toselect Internalor external ECL, 0V, TTL clockmodes. Select internal unless usinganexternal clocksignal. SeeChapter 7, “A Question of Timebase,” for external clock. TheLT364 series has a“Channel Use” menubelow“SampleClock” (

33、see“Pairing Channels” inChapter 8). ToswitchsequencemodeOnor Off. Usetheknobto choosethenumber of segments. SeeChapter 7, “A Question of Timebase,” for sequencesampling. Toselect themaximum number of samples to be acquired, usingthemenuknob; and, toset thedefault 50k, usingthemenubutton. PA R TON E:

34、G E T T I N GS T A R T E D 24ISSUED: January2002LTXXX-OM-E Rev B SET THE COUPLING 20. Press 1 andthenthebuttonfortodisplaythecouplingmenus. 21. Usethesemenus toset input signal couplingandgrounding, thechannel bandwidthlimit, andtheprobeattenuation. Selects thesignal coupling. Moves your selectiondo

35、wnthelist. Whenat thebottom, as here, the downarrowdisappears andthis buttonbecomes inactive. Press NORMAL toset offset, volts/div, andinput couplingtodisplay ECL signals. Press again; settings for TTL signals aregiven. Press a thirdtime; settings will returntothoseof thelast manual setup. Press tot

36、urnthebandwidthlimit Offor reducethebandwidthto 200 MHz or 25 MHz. Reduces signal andsystem noiseandprevents high-frequencyaliasing. Global BWL means that thelimit set will applytoall channels. BWL means that alimit canbeset individually for eachchannel. SeetheTIP on page20 for howtoset these, using

37、 SPECIAL MODES. Toset theprobeattenuationfactor for theinput channel. Thebuttons scroll upor down, whilethe knobs scroll theselector upanddownthelist. LeCroys ProBus system automaticallysenses probes andsets their attenuation. This menuthenchanges toindicate thetypeof probeattachedandits attenuation

38、factor. Seethefollowingpages for moreonprobes and ProBus. N NO OT TE E: : AC position: signals are coupled capacitively, the input signals DC component is blocked, and signalfrequencies below10Hz are limited. DC position: signalfrequencycomponents are allowed topass through, and aninput impedance of

39、 either1M or50 canbeselected. The maximumdissipationinto50 is 0.5W. Whenever this is attained, inputs willautomaticallybe grounded. “Grounded” willbe highlighted inthe “Coupling” menu and anoverload message willbe displayedinthe AcquisitionSummaryfield. Reset byremoving the signalfromthe input and r

40、eselecting “DC50 .” CH A P T E RON E:Catcha NewWave LTXXX-OM-E Rev BISSUED: January200225 SETUP FOR CAL AND BNC SIGNALS 1.Press UTILITIES . 2.Press thebuttontoselectanddisplaytheCAL BNC OUT menus. 3.Usethesemenus tochoosethetypeof signal put out at thefront CAL and rear BNC signal outputs. Set thefr

41、equency, amplitude, andpulseshapeof thecalibrationsignal. Toset thetypeof signal from therear BNC connector. Toreset theCAL output toits default state: a1 kHz 1 V squarewave. TheWaverunner automaticallysets thecalibration signal toits default when switchedon. Toselect theformof thecalibrationsignal.

42、 Toset thepulselevel for theCAL output (range: 1.00 to 1.00 V), usingtheknob. Toset thedesiredfrequencyof aCAL signal intherange 500 Hz to1 MHz, usingtheknob. PA R TON E:G E T T I N GS T A R T E D 26ISSUED: January2002LTXXX-OM-E Rev B TOCAL IBRAT E T H EPASSIVEPROBE Your Waverunner scope comes with

43、a L eCroy passive probe for each channel. First.Turn on your Waverunner scope. Second.Insert the probe lead in the Channel 1 input. Third.Connect the probe tip to the CA L output (see front panel illustration in “First Things”). Fourth.A ttach the leads alligator clip to the ground ring indicated by

44、, located below CA L . The CA L signal will be a 1 kHz square wave, 1 V pp. Fifth.Press UTILITIES , then the button to select Sixth.Pressto selectand set the amplitude level. Seventh.N ow selectto set the frequency in the range 500 Hz to 1 MHz. E ighth.Set channel coupling to DC 1 Musing “Coupling”

45、(see previous page). N inth.Press1to turn on Channel 1. Tenth.Press AUTO SETUP twice. If overshoot or undershoot of the displayed signal occurs, adjust the probe by inserting the small screwdriver, supplied with the probe package, into the potentiometer on the probe head and turning it clockwise or

46、counterclockwise to achieve the optimal square wave contour. CH A P T E RON E:Catcha NewWave LTXXX-OM-E Rev BISSUED: January200227 HOWPROBUSHE L PSYOU L eCroys ProBus probe system provides a complete measurement solution from probe tip to oscilloscope display. ProBus allows you to control transparen

47、t gain and offset directly from your front panel particularly useful for voltage, differential, and current active probes. It uploads gain and offset correction factors from the ProBus E PROMS, and automatically compensates to achieve fully calibrated measurements. This intelligent interconnection b

48、etween your Waverunner scope and a wide range of accessories offers important advantages over standard BN C and probe ring connections. ProBus ensures correct input coupling by auto-sensing the probe type, eliminating the guesswork and errors that occur when attenuation or amplification factors are set manually. T TI IP P: : Use Waverunners rearpanelBNC signaloutput toprovide a pulse: ForPass/Failtesting At the occurrence of eachaccepted triggerevent (TriggerOut) Whenthe scope is readytoaccept a triggerevent (TriggerRdy)