lecroy 21_LTXXX-OM-E_App 电路图.pdf

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1、LTXXX-OM-E Rev BISSUED: January2002231 AP P E N D I XArchitectureandSpecifications InstrumentArchitectureOverview PROCESSORS TheWaverunner central processingunit (CPU), aPowerPC microprocessor, performs theoscilloscopes computations, andcontrols its operation. A rangeof peripheral interfaces allowyo

2、utocontrol remotely, store waveforms andother data, andmakehardcopies. A support processor constantlymonitors thefront panel controls. TheWaverunner transfers datatodisplaymemoryfor direct waveform display, or stores it to referencememories for fast dataprocessing. ADCs EachWaverunner channel has an

3、8-bit Analog-to-Digital Converter (ADC). Theinstruments ADC architecture is designedtogiveexcellent amplitudeandphasecorrelation, maximum analog-to-digital conversion performance, largerecordlengths, andsuperior timeresolution. MEMORIES Waverunner acquisitionmemories simplifysignal acquisitionbyprod

4、ucingwaveform records that allow detailedanalysis over largetimeintervals. Therearefour memories for temporarystorage, andfour morefor waveform zoomingandprocessing. RIS TheWaverunner oscilloscopecaptures andstores repetitivesignals at amaximum Random Interleaved Sampling(RIS)rateof 25 GS/s. This ad

5、vanceddigitizingtechniqueenables measurement of repetitivesignals withaneffectivesamplinginterval of 100 ps, andameasurement resolutionof upto10 ps. TRIGGER SYSTEM Youcancontrol Waverunner triggeringtoahighlyspecializeddegreeinaccordancewithwaveform characteristics andchosentrigger conditions. Thetr

6、igger sourcecanbeanyof theinput channels, line (synchronizedtoscopes maininput supply)or external. Thecouplingis selectedfrom AC, LF REJect, HF REJect, HF, andDC; theslopefrom positiveandnegative. Waverunner SMART Trigger offers awiderangeof sophisticatedtrigger modes matchedtospecial trigger condit

7、ions andsets of conditions. RadioFans.CN 收音机爱 好者资料库 AP P E N D I X 232ISSUED: January2002LTXXX-OM-E Rev B AUTOMATIC CALIBRATION TheWaverunners automatic calibrationensures an overall vertical accuracyof typically1% of full scale. Vertical gainandoffset calibration, andhorizontal (time)resolution tak

8、eplaceeachtimeyouchangethevolts per divisionsetting. Periodic andtemperaturedependent auto-calibrationensures long-term stabilityat the current setting. DISPLAY SYSTEM Youcontrol thedisplays interactive, user-friendlyinterfaceusingpushbuttons andknobs. Displayas manyas eight different waveforms at o

9、nceoneight separategrids. Theparameters controllingsignal captureare simultaneouslyreported. TheWaverunner displays internal status andmeasurement results, as well as operational, measurement, andwaveform analysis menus. The8.4-inchcolor flat panel TFT LCD screendisplays waveforms anddatabymeans of

10、advancedcolor management. Overlapmixingandcontrast enhancement functions ensurethat overlappingwaveforms remain distinct at all times. Preset andpersonal color schemes areavailable. TheAnalogPersistencefunction offers displayattributes of ananaloginstrument withall theadvantages of digital technolog

11、y. TheFull Screenfunctionexpands waveform grids tofill theentirescreen. A hardcopyof thescreencanbeeasilyproducedbypressingthefront panel PRINT SCREEN button. INTERFACE AND PANEL SETUPS AlthoughtheWaverunner is atrulydigital instrument, thefront panel layout andcontrols aresimilar to those of ananal

12、ogoscilloscope. Rapidresponseandinstant representationof waveforms onthehigh resolution screenaddtothis similarity. Four front panel setups can bestoredinternally, andrecalleddirectlyor byremote control, thus ensuringrapidfront panel configuration. Whenpower is switchedoff, thefront panel settings a

13、re automaticallystoredfor recall whenthescopeis next poweredon. REMOTE CONTROL TheWaverunner has also beendesignedfor remotecontrol operationinautomatedtestingandcomputer aided measurement applications. Youcontrol theentiremeasurement process cursor andpulse-parameter settings, dynamic modification

14、of front panel settings, anddisplayorganization throughtherear panel industry standardGPIB (IEEE-488)andstandardRS-232-C ports. SeeChapter 12, “Use Waverunner with PC,” of this manual andtheRemote Control Manual. RadioFans.CN 收音机爱 好者资料库 ArchitectureandSpecifications LTXXX-OM-E Rev BISSUED: January20

15、02233 Display Processor External Trigger CH1 CH2 CH3 CH4 Timebase Program Memory Power PC Microprocessor withIntegrated CacheMemory Centronics RS-232-C GPIB Front-Panel Processor Real-Time Clock DataMemories FloppyDisk Interface Sample LT224: 200 MHz. Bandwidth 50 andat probetipwithPP006. BandwidthL

16、imiter at 25 MHz (LT224), and25 MHz or 200 MHz (other models)can be selectedfor eachchannel. Input Impedance: 50 1.0%; 1 M 1.0% / 12 pF typical (usingPP006 probe) Input Coupling: 1 M: AC, DC, GND; 50 : DC, GND MaxInput: 50 : 5 V rms; 1 M: 400 V max(peakAC 5 kHz + DC) Single Shot Sampling Rate: LT342

17、/LT344/LT364: 500 MS/s; LT224/LT322: 200 MS/s AcquisitionMemory(4channel): LT342L/LT344/LT364L: 1 M; LT342/LT344/LT364: 250kpoints per channel; LT224/LT322: 100kpoints per channel; 1 M points per channel onL models AcquisitionMemory(2channel): LT364: 500k; LT364L: 2 M VerticalResolution: 8 bits Sens

18、itivity: 2 mV to5 V/div fullyvariable; 10 V/div DC Accuracy: 1.5% (0.5% of full scale) Offset Range: 2 mV to50 mV/div: 1 V 100 mV to500 mV/div: 10 V 1 V to10 V/div: 100 V Interleaved Channels: LT364Series: 2 ArchitectureandSpecifications LTXXX-OM-E Rev BISSUED: January2002235 ACQUISIT IONMODE S MODE

19、TIMEBASESE T T IN GMAXIMUMRAT EDE SCRIPT ION 5 ns to1000 s/div (LT364)1 GS/s (LT364) 10 ns to1000 s/div (LT342/LT344) 500 MS/s Single Shot 20 ns to1000 s/div (LT224/LT322) 200 MS/s (LT224) OneADC per channel 1 ns to5 sec/div (LT342/LT344/LT364) 25 GS/s Repetitive 5 ns to5 sec/div (LT224/LT322) 10 GS

20、/s Random InterleavedSampling (RIS) Sequence LT342/LT344/ LT364 21000 segments500 MS/s Stores MultipleEvents with timestampinsegmented acquisitionmemories LT224/LT3222400 segments 500 MS/s 200 MS/s (LT224) Stores MultipleEvents with timestampinsegmented acquisitionmemories LT342L/LT344L /LT364L 2400

21、0 segments500 MS/s Stores MultipleEvents with timestampinsegmented acquisitionmemories 500 kpts: 500 ms to1000s/div Roll 500 kpts: 1 s to1000 s/div 100 kS/s Waveform slowlyrolls across displaywhenusedwithslow timebases. TIMEBASE SYSTEM Timebases: Mainanduptofour zoom traces simultaneously Time/DivRa

22、nge: 1 ns/div to1000 s/div ClockAccuracy: 10 ppm InterpolatorResolution: 5 ps ExternalClock: LT342/LT344/LT322: 500 MHz; LT224: 200 MHz; 50 , or 1 M impedance AP P E N D I X 236ISSUED: January2002LTXXX-OM-E Rev B TRIGGERING SYSTEM Modes: NORMAL, AUTO, SINGLE andSTOP Sources: Anyinput channel, Extern

23、al, EXT 10 or line; slope, level, couplinguniquetoeachexcept line. Coupling Modes: DC, AC, HF, HFREJ, LFREJ (reject frequency50 kHz typical) Pre-TriggerRecording: 0100% of horizontal timescale Post TriggerDelay: 010 000 divisions Holdoff byTime orEvents: Upto20 s or from 1 to99 999 999 events Intern

24、alTriggerRange: 5 div MaximumTriggerFrequency: Upto500 MHz withHF coupling ExternalTriggerInput: 0.5 V, 5 V with Ext 10; maxinput sameas input channels SMART TRIGGER TYPES (ALL MODELS) Signalorpulse width: Triggers onglitches downto2 ns. Pulsewidths areselectablebetween2.5 ns to20 s. Signalinterval:

25、 Triggers onintervals selectablebetween10 ns and20 s. TV: Triggers online(upto1500)andfield1 or 2 (oddor even)for PAL (SECAM), NTSC, or non-standard video(LT364Series: achoiceof 1, 2, 4, or 8 fields is offered). State/Edge qualified: Triggers onanyinput sourceonlyif agivenstate(or transition)has occ

26、urredon another source. Delaybetweensources is selectablebytimeor number of events. Dropout: Triggers if theinput signal drops out for longer thanaselectedtime-out between25 ns and20 s. Window: Triggers whenthesignal crosses thewindowboundaries, whichextendaboveandbelowtheselected trigger level. A t

27、rigger event will occur whenthesignal leaves this windowregionineither directionandpasses into theupper or lower region. Thenext trigger will occur when thesignal againpasses into thewindowregion. SMART TRIGGER TYPES (LT364SERIES ONLY) Pattern(5inputs): Enables triggeringonalogical combination of th

28、efiveinputs CH 1, CH 2, CH 3, CH 4 andEXT. This combination, calledapattern, is definedas thelogical AND of trigger states. ArchitectureandSpecifications LTXXX-OM-E Rev BISSUED: January2002237 AUTOSETUP Automaticallysets timebase, trigger, andsensitivitytodisplayawiderangeof repetitivesignals. Verti

29、calFind: Automaticallysets sensitivityfor theselectedinput signal PROBES ModelPP006: PP006 withauto-detect: 10:1, 10 M; oneprobeper channel Probe System: ProBus Intelligent ProbeSystem supports active, highvoltage, current, anddifferential probes, anddifferential amplifiers COLOR WAVEFORM DISPLAY Ty

30、pe: Color 8.4-inchflat panel TFT LCD withVGA, 640 x480 resolution ScreenSaver: Displayblanks after 10 minutes RealTime Clock: Date, hours, minutes, andseconds displayedwithwaveform Numberof Traces: Maximum eight onLT344, LT224 Series, sixonLT342, LT322 Series; simultaneously displaychannel, zoom, me

31、mory, andmathtraces Grid Styles: Single, Dual, Quad, Octal, XY, Single+XY, Dual+XY; Full Screengives enlargedviewof each style WaveformDisplayStyles: Sampledots joinedor dots only regular or bold ANALOG PERSISTENCE DISPLAY Analog Persistence and ColorGraded Persistence: Variablesaturationlevels; sto

32、res eachtraces persistence datainmemory Trace Display: Opaqueor transparent overlap ZOOM EXPANSION TRACES Style: Displayuptofour zoom traces VerticalZoom: Upto5xexpansion, 50 x withaveraging HorizontalZoom: Expandto2 pts/div, magnifyto50 000 x Autoscroll: Automaticallyscananddisplayacapturedsignal A

33、P P E N D I X 238ISSUED: January2002LTXXX-OM-E Rev B RAPID SIGNAL PROCESSING Processor: 96 MHz Power PC LT342/ LT322LT364/ LT344/ L T224LT342LLT364/ LT344L 16 MBYTES16 MBYTES32 MBYTES32 MBYTES 64 MBYTE SYSTEM MEMORY OPTIONAL FOR ALL MODELS INTERNAL WAVEFORM MEMORY Waveform: M1, M2, M3, M4; memorylen

34、gthequal toacquisitionmemory Zoomand Math: A, B, C, D; memorylengthequal toacquisitionmemory Memories M14 andAD storefull-lengthwaveforms with16 bits/datapoint SETUP STORAGE Forfront paneland instrument status: Four non-volatilememories andfloppydrivearestandard; harddrive andmemorycardareoptional M

35、ATH TOOLS Simultaneouslyperform uptofour mathprocessingfunctions; traces canbechainedtogether toperform math onmath. Standardfunctions: add, subtract, multiply, divide, negate, identity, summation, averagingto1000 sweeps, ERES low-pass digital filters for 11-bit vertical resolution, FFT of 50 kpoint

36、 waveforms, Extremafor displayingenveloperoof andfloor, physical units, rescale(withunits), sinx/x, resample(deskew). ArchitectureandSpecifications LTXXX-OM-E Rev BISSUED: January2002239 MEASURE TOOLS CursorMeasurements: Relative Time: Twoarrowcursors measuretimeandvoltagedifferences relativetoeacho

37、ther witha resolutionof 0.05% full scale. Relative Amplitude (Voltage): Twohorizontal bars measurevoltagedifferences at 0.2% fs resolution. Absolute Time: Cross-hair marker measures timerelativetotrigger andvoltagewithrespect toground. Absolute Amplitude (Voltage): A horizontal referencelinecursor m

38、easures voltagewithrespect to ground. Automated Measurements: Displayanyfiveparameters together withtheir average, high, lowandstandard deviations. Pass/Fail: Test anyfiveparameters against selectablethresholds. Limit testingis performedusingmasks createdonthescopeor onaPC. Setupapass or fail condit

39、iontoinitiateactions suchas hardcopyoutput, save waveform tomemory, GPIB SRQ, or pulseout. EXTENDED MATH AND MEASUREMENTS OPTION Adds mathandadvancedmeasurements for general purposeapplications. MathTools is expandedtoincludeall standardmathplus integration, derivative, logandexponential (baseeandba

40、se10), square, squareroot, absolutevalue, plus datalogwhenusingthetrendfunction. WAVEANALYZER OPTION Adds mathprocessingtoincludeFFTs of 1 Mpoint waveforms, power spectrum density, spectrum averaging, waveform averagingto onemillion sweeps, continuous averaging, waveform histograms, andhistogram par

41、ameters. Includes theExtendedMathandMeasurement option. SPECIAL APPLICATION SOLUTIONS Jitterand Timing Analysis (JTA): Precisioncycle-to-cycletimingmeasurements withenhancedaccuracy, histograms on persistencetraces, persistencetowaveform tracingandfull statistical analysis. PowerMeasure : A complete

42、solutionfor thepower conversionengineer. Includes timingdeskewof voltage andcurrent, andrescaletoelectrical units. AP P E N D I X 240ISSUED: January2002LTXXX-OM-E Rev B INTERFACE Remote Control: Full control viaGPIB andRS-232-C* FloppyDrive: Internal, DOS format, 3.5 highdensity PC Card Slot: Suppor

43、ts memoryandharddrivecards ExternalMonitorPort: 15-pinD-TypeVGA compatible* Centronics Port: Parallel printer interface* Internalgraphics printer(optional): 25 mm/s max, 112 mm paper width; provides hardcopyoutput in 10 seconds Ethernet (optional): 10BASE-T * Shieldedcables of less than3 m lengthare

44、requiredtoconform withEMC Directive89/336/EEC. OUTPUTS Calibratorsignal: 500 Hz1 MHz squarewave, 1.0 to+1.0, test point, andgroundlugonfront panel Controlsignals: Choiceof trigger ready, trigger out, or Pass/Fail status; TTL levels into1 M at rear panel BNC (output resistance300 10%) GENERAL Operati

45、ng Conditions: Temperature540 C; Humidity80% RH max(non-condensing)at 40 C; Altitude 2000 m Shockand Vibration: Conforms toselectedsections of MIL-PRF-28800F, Class 3 PowerRequirements: 90132 V AC and180250 V AC; 4566 Hz; automatic AC voltageselection; Power dissipation: 230 VA max Dimensions (HWD):

46、 210 mm x350 mm x300 mm (8.3 x13.8 x11.8); height excludes scopefeet Weight: 8 kg(18 lbs) Warrantyand Calibration: Threeyears; calibrationrecommendedyearly Certifications: CE, UL andcUL CE Declarationof Conformity: Theoscilloscopemeets requirements of theEMC Directive89/336/EEC for Electromagnetic C

47、ompatibilityandLowVoltageDirective73/23/EEC for Product Safety. EMC DirectiveEN61326-1: 1997 EMC requirements for electrical equipment for measurement, control, andlaboratoryuse. ArchitectureandSpecifications LTXXX-OM-E Rev BISSUED: January2002241 Electromagnetic Emissions:EN55011: 1991, Class A Rad

48、iatedandconductedemissions EN61000-3-2: 1995Harmonic Current Emissions EN61000-3-3: 1995VoltageFluctuations andFlickers Warning: This is a Class A product. Ina domestic environment this product maycause radio interference, inwhichcase the usermaybe required totake adequate measures. Electromagnetic

49、Immunity:ENV 50204: 1995900 MHz KeyedCarrier RF Field EN 61000-4-2: 1995Electrostatic Discharge EN 61000-4-3: 1996*RF RadiatedElectromagnetic Field EN 61000-4-4: 1995*Electrical Fast Transient/Burst EN 61000-4-5: 1995*Surges EN 61000-4-6: 1996*RF ConductedElectromagnetic Field EN 61000-4-8: 1994Power FrequencyMagnetic Field EN 61000-4-11: 1994*Mains Dips andInterruptions * Meets PerformanceCriteria“B” limits at certaintest levels, duringthedisturbance, product undergoes a temporarydegradationor loss of functionof performancewhichis self recoverable. * Meets Performance