LECROY 9300C Series User 电路图.pdf

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1、 Operators Manual Operators Manual LeCroy 9300C Series Digital Oscilloscopes LeCroy 9300C Series Digital Oscilloscopes Revision A January 1998 Revision A January 1998 RadioFans.CN 收音机爱 好者资料库 LeCroy Corporation LeCroy Corporation 700 Chestnut Ridge Road Chestnut Ridge, NY 109776499 Tel: (845) 578 602

2、0, Fax: (845) 578 5985 LeCroy SALeCroy SA 2, rue du Pr-de-la-Fontaine 1217 Meyrin 1/Geneva, Switzerland Tel: (41) 22 719 21 11, Fax: (41) 22 782 39 15 Internet:Internet: Copyright January 1998, LeCroy. All rights reserved. Information in this publication supersedes all earlier versions. Specificatio

3、ns subject to change. LeCroy, ProBus and SMART Trigger are registered trademarks of LeCroy Corporation. MathCad is a registered trademark of MATHSOFT Inc. Centronics is a registered trademark of Data Computer Corp. Epson is a registered trademark of Epson America Inc. PowerPC is a registered tradema

4、rk of IBM Microelectronics. MATLAB is a registered trademark of The MathWorks, Inc. DeskJet, ThinkJet, QuietJet, LaserJet, PaintJet, HP 7470 and HP 7550 are registered trademarks of Hewlett- Packard Company. I2C is a trademark of Philips. Manufactured under an ISO 9000 Registered Quality Management

5、System Visit to view the certificate. This electronic product is subject to disposal and recycling regulations that vary by country and region. Many countries prohibit the disposal of waste electronic equipment in standard waste receptacles. For more information about proper disposal and recycling o

6、f your LeCroy product, please visit 93XXC-OM-E Rev A 0198 RadioFans.CN 收音机爱 好者资料库 iii Contents Chapter 1 Read This First! Product and Client Care.11 Chapter 2 Instrument Architecture General Designed Capabilities.21 Block Diagrams.24 Chapter 3 Installation and Safety Installation for Safe and Effici

7、ent Operation.31 Chapter 4 Introduction to the Controls The Front Panel.41 The Main Controls.43 Choosing and Navigating in Menus.44 System Setup and Menu Controls.46 Screen Topography.48 Chapter 5 CHANNELS, Coupling and Probes Channel Controls. 51 Coupling.53 Probes and Probe Calibration .54 Chapter

8、 6 TIMEBASE + TRIGGER TIMEBASE + TRIGGER Controls.61 Chapter 7 Timebase Modes and Setup Timebase Sampling Modes.71 Timebase Setup.75 RadioFans.CN 收音机爱 好者资料库 iv Contents Chapter 8 Triggers and When to Use Them Choosing the Right Trigger .81 Edge or SMART?.82 Edge Trigger.83 TRIGGER SETUP: Edge .89 SM

9、ART Triggers.810 TRIGGER SETUP: SMART .829 Chapter 9 ZOOM + MATH Zoom and Math Controls. .91 Chapter 10 Zoom, Mathematics and Math Setup Zooming for Precise Waveform Measurements.101 Math Functions and Options .102 Using Waveform Mathematics.105 Configuring for Zoom and Math.106 Setting Up FFT Span

10、and Resolution .1017 Chapter 11 Display Setting Up the Display . 111 Chapter 12 UTILITIES Printing, Storing, Using Special Modes .121 Hardcopy Setup .122 Time/Date Setup.124 GPIB/RS232 Setup.125 Mass Storage Utilities .127 Special Modes. 1219 CAL BNC Setup.1221 v Chapter 13 WAVEFORM STORE the slope

11、from positive and negative. (See Chapter 8.) Automatic CalibrationThe oscilloscope s automatic calibration ensures an overall vertical accuracy of typically 1% of full scale. Vertical gain and offset calibration take place each time the volts/div setting is modified. In addition, periodic calibratio

12、n is performed to ensure long-term stability at the current setting. Display SystemThe display s interactive, user-friendly interface is controlled by push-buttons and knobs (see Chapter 4). The large, 12.5 17.5 cm (nine-inch diagonal) screen shows waveforms and data with enhanced resolution on a va

13、riety of grid styles (see Chapter 11). Up to four waveforms can be displayed at once, while the parameters controlling signal acquisition are simultaneously reported. The screen presents internal status and measurement results, as well as operational, measurement, and waveform-analysis menus. Printi

14、ng or copying the screen on plotter, printer or to a recording medium is done by pressing the front-panel SCREEN- DUMP button(See Chapter 12). 23 Manual or Remote Control Despite being a truly digital instrument, the scope has a front- panel layout and controls that will be familiar to users of anal

15、og oscilloscopes. Rapid instrument response and instant representation of waveforms on the high-resolution screen add to this impression. Four front-panel setups can be stored internally and recalled either manually or by remote control, thus ensuring rapid front- panel configuration. When the power

16、 is switched off, the current front-panel settings are automatically stored for subsequent recall at the next power-on. The oscilloscope has also been designed for remote control operation in automated testing and computer-aided measurement applications operations described in the Remote Control Man

17、ual. The entire measurement process, including cursor and pulse-parameter settings, dynamic modification of front-panel settings, and display organization, is controlled through the rear-panel GPIB (IEEE-488) and RS-232-C ports (see Chapter 12). 24 Instrument Architecture Block Diagrams ? 9304C, 931

18、0C, 9314C Series Sample 0.5 V with EXT as trigger source; 5 V with EXT/10 as trigger source; and Inactive with Line as trigger source. The trigger sensitivity is better than a third-of-a-screen division. 64 TIMEBASE + TRIGGER TIMEBASE SETUP menu-entry button that calls up the “ TIMEBASE” menus descr

19、ibed in the next chapter. TRIGGER SETUP menu-entry button that calls up “ TRIGGER SETUP” detailed in Chapter 8. 71 7 Timebase Modes and Setup Timebase Sampling Modes Depending on the timebase, any of three sampling modes can be chosen: Single-Shot, Random Interleaved Sampling (RIS) or Roll Mode. Fur

20、thermore, for timebases suitable for either Single-Shot or Roll Mode, the acquisition memory can be subdivided into user-defined segments to give Sequence Mode. Channels can also be combined to boost sample rate and record length. Single-ShotSingle-Shot is the digital oscilloscope s basic acquisitio

21、n technique and other timebase modes make use it. An acquired waveform consists of a series of measured voltage values sampled at a uniform rate on the input signal. The acquisition, a single series of measured data values associated with one trigger event, is typically stopped at a fixed time after

22、 the arrival of the event, this being determined by the trigger delay. The time of the trigger event is measured using the timebase clock. The horizontal position of a waveform is determined using the trigger event as the definition of time zero. Waveform display is also carried out using this defin

23、ition. Because each channel has its own ADC, the voltage on each input channel is sampled and measured at the same instant. This allows very reliable time measurements between different channels. Trigger delay can be selected anywhere within a range that allows the waveform to be sampled from well b

24、efore the trigger event up to the moment it occurs (100 % pre-trigger), or at the equivalent of 10 000 divisions (at the current time/div) after the trigger. For fast timebase settings the ADCs maximum single-shot sampling rate is used (on one and each channel, with higher sampling rates achieved by

25、 combining channels see page 74). For slower timebases, the sampling rate is decreased and the number of data samples maintained. (See Appendix A for details). 72 Timebase Modes and Setup When using slow timebases, sample-rate decreases and very short events such as glitches can be missed if they oc

26、cur between two samples. To prevent this, a special circuitry called the Peak Detect system can be switched on (see “ Channel Use” menu, page 75) to capture the signal envelope with a resolution of 2.5 ns. This is done without destroying the underlying, simultaneously captured data, on which a wide

27、range of advanced processing can be performed. RIS is an acquisition technique that allows effective sampling rates higher than the maximum single-shot sampling rate. It is used on repetitive waveforms with a stable trigger. The maximum effective sampling rate of 10 GS/s can be achieved by acquiring

28、 100 single-shot acquisitions, or bins, at 100 MS/s using the 9304C, 9310C, 9314C Series oscilloscopes; 20 bins at 500 MS/s when using the other models. These bins are positioned approximately 0.1 ns apart. The process of acquiring this number of bins and satisfying the time constraint is random. Th

29、e relative time between ADC sampling instants and the event trigger provides the necessary variation, measured by the timebase to 10 ps accuracy. Peak Detect NOT AVAILABLE WITH 9304C, 9310C, 9314C SERIES RIS: Random Interleaved Sampling 73 On average, 104 trigger events are needed to complete an acq

30、uisition. But sometimes many more are needed. These segments are interleaved to provide a waveform covering a time interval that is a multiple of the maximum single-shot sampling rate. However, the real-time interval over which the waveform data are collected is orders of magnitude longer and depend

31、s on the trigger rate and the desired level of interleaving. The oscilloscope is capable of acquiring approximately 40 000 RIS segments per second. RollSingle-shot acquisitions at timebase settings slower than 0.5 s/div (10 s/div for traces with more than 50 000 points) have a sufficiently low data

32、rate to allow the display of the incoming points in real time. The oscilloscope shows the incoming data continuously, “ rolling” it across the screen, until a trigger event is detected and the acquisition completed. The latest data is used to update the trace display in the same manner as a strip-ch

33、art recorder. Waveform Math and Parameter calculations are done on the completed waveforms. SequenceSequence Mode is an alternative to single-shot acquisition that offers many unique features. The complete waveform consists of a number of fixed-size segments acquired in Single-Shot Mode (see Appendi

34、x A for the limits), which are able to be selected. . The dead time between the trigger events for consecutive segments can be kept to under 50 s in contrast to the hundreds of milliseconds normally found between consecutive single-shot waveforms. Complicated sequences of events covering a large tim

35、e interval can be captured in fine detail, ignoring uninteresting periods between events. And time measurements can be made between events on different Note: to ensure low deadtime between segments, button-pushing and knob-turning is to be avoided during sequence acquisition. Note: The behavior of ,

36、 , and is modified in Roll Mode and Sequence Modes (refer to previous chapter and pages 78 and 79). 74 Timebase Modes and Setup segments of a sequence waveform using the full precision of the acquisition timebase. Trigger-time stamps are given for each of the segments in the “ Text if the time betwe

37、en two consecutive triggers exceeds a time-out that can be selected, the acquisition will stop. Max. segment To select using the corresponding button or associated knob the maximum record length for each segment. See Appendix A for model maximums. Note: A summary of the acquisition conditions is dis

38、played above the “TIMEBASE” menus, indicating number of segments, available record length per segment, sampling rate, and timebase setting. 81 8 Triggers and When to Use Them Choosing the Right Trigger Your oscilloscope offers many distinctive and useful techniques for triggering on and capturing da

39、ta. These range from the simple Edge triggers to the advanced SMART Trigger types, which trigger on multiple inputs. Three triggering modes are available: AUTO, NORM and SNGL. Additionally, STOP enables the acquisition process to be aborted. All are directly accessible by pressing the respective fro

40、nt-panel buttons. (See Chapter 6.) Modifying Trigger Settings Trigger adjustments are made directly using the front-panel controls and with the trigger menus. Rotating for example causes the scope to adjust the trigger level of the highlighted trace. Pressing accesses advanced trigger operations, su

41、ch as changing the glitch width or the hold-off timeout, which are changed via the TRIGGER SETUP menu group (Fig. 81). Once the trigger configuration has been modified, changes are stored internally in a non-volatile memory. Figure 81. Main Trigger Menu. This chapter describes the triggering operati

42、ons and offers hints on how to perform them. Along with the standard menu descriptions, schematics show the trigger-menu structure, and diagrams explain how the main triggers work. TRIGGER SETUP Edge SMART 82 Triggers and When to Use Them Edge or SMART A variety of triggers for different applications can be chosen from the two main trigger groups, the Edge and SMART trigger types. Edge TriggersIn the Edge group of menus trigger conditions are defined by the vertical trigger level, coupling, and slope. Edge triggers use simple selection criteria to characterize a signal. They are most use