LeCroy_LC_Oscilloscope_Operators_Manual_REVA 电路图.pdf

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1、 Operators Manual Operators Manual LeCroy LC Series Color Digital Oscilloscopes LeCroy LC Series Color Digital Oscilloscopes Revision K December 1999 Revision K December 1999 RadioFans.CN 收音机爱 好者资料库 LeCroy CorporationLeCroy Corporation 700 Chestnut Ridge Road Chestnut Ridge, NY 109776499 Tel: (914)

2、578 6020, Fax: (914) 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 1999, LeCroy. All rights reserved. Information in this publication supersedes all earlier versions. Speci

3、fications subject to change. LeCroy, ProBus and SMART Trigger are registered trademarks of LeCroy Corporation. Centronics is a registered trademark of Data Computer Corp. Epson is a registered trademark of Epson America Inc. I2C is a trademark of Philips. MathCad is a registered trademark of MATHSOF

4、T Inc. MATLAB is a registered trademark of The MathWorks, Inc. Microsoft, MS and Microsoft Access are registered trademarks, and Windows and NT trademarks, of Microsoft Corporation. PowerPC is a registered trademark of IBM Microelectronics. DeskJet, ThinkJet, QuietJet, LaserJet, PaintJet, HP 7470 an

5、d HP 7550 are registered trademarks of Hewlett-Packard Company. Manufactured under an ISO 9000 Registered Quality Management 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 dis

6、posal of waste electronic equipment in standard waste receptacles. For more information about proper disposal and recycling of your LeCroy product, please visit LCXXX-OM-E Rev K 1299 RadioFans.CN 收音机爱 好者资料库 LCXXX-OM-E Rev KISSUED: December 1999LLL and infrequently minor logic changes. Be assured, ho

7、wever, that the scope itself incorporates the most up-to-date circuitry. LeCroy frequently updates firmware and software during servicing to improve scope performance, free of charge during warranty. You will be kept informed of such changes, through new or revised manuals and other publications. Ne

8、vertheless, you should retain this original manual to refer to your scopes unchanged hardware specifications. 6HUYLFH?DQG?5HSDLUPlease return products that require maintenance to the Customer Service Department in your country, or to an authorized service facility. You are responsible for transporta

9、tion charges to the factory, whereas all in-warranty products will be returned to you with transportation prepaid. Outside the warranty period, you will need to provide us with a purchase order number before we can repair your LeCroy product. You will be billed for parts and labor related to the rep

10、air work, and for shipping. LCXXX-OM-E Rev KISSUED: December 1999? / the slope from positive and negative. The SMART Trigger types offer a wide range of sophisticated trigger modes matched to special trigger conditions and sets of conditions. See Chapter 8. $XWRPDWLF? that is, the limit that you set

11、 will apply to all channels. When a limit can be set individually for each channel, it appears as ?ISSUED: December 1999LCXXX-OM-E Rev K that is, the limit that you set applies to all channels. When a limit can be set individually for each Illustrated at right: a LeCroy current probe with ProBus con

12、nection. LCXXX-OM-E Rev K?ISSUED: December 1999? / and to access the “TIMEBASE” and “TRIGGER” menu groups. See Chapter 7 for descriptions of the Timebase Modes that are affected by these controls. See Chapter 8 for trigger details. 6723This button halts the acquisition in any of the three re-arming

13、modes: AUTO, NORMAL or SINGLE. Press the STOP button to prevent the oscilloscope from acquiring a new signal. If you press STOP while a single-shot acquisition is in process, the last acquired signal is kept. If you press STOP after an RIS acquisition has started, the acquisition is halted, and a pa

14、rtial waveform reconstruction is done. If you press STOP when the acquisition is in Roll Mode, the incomplete acquisition data is shown as if a trigger had occurred. (LC584 AND LC684 SERIES: You can turn on zoom expansions after pressing STOP.) In Sequence Mode, pressing STOP stops the timebase and

15、shows all new segments. ?ISSUED: December 1999LCXXX-OM-E Rev K 7,0(%$6(?75,*(5 $872Press this button to place the instrument in Auto Mode: the scope automatically displays the signal if no trigger quickly occurs. If a trigger does occur within this time, the oscilloscope behaves as in Normal Mode. I

16、f you press AUTO in RIS Mode, the instrument ends the acquisition and displays it each second (some required segments may be missing). If you press AUTO in Roll Mode, the oscilloscope samples the input signals continuously and indefinitely. The acquisition has no trigger, but you can stop it wheneve

17、r you desire. If you press AUTO in Sequence Mode, the acquisition ends if the time between two consecutive triggers exceeds some selectable timeout. The next acquisition then starts from Segment 1. (See Chapter 12, “Special Modes.”) 1250$/Press this button to continuously update the screen while a v

18、alid trigger is present. If there is no valid trigger, the instrument preserves the last signal, and displays the warning “SLOW TRIGGER” in the Trigger Status Field. If you press NORMAL in Roll Mode, the acquisition ends when the last needed data after a trigger have been taken. The display pauses t

19、o show the entire waveform. It then goes back into Roll Mode while it waits for the next trigger. If you press NORMAL in Sequence Mode, the acquisition ends after the last segment is acquired. The next acquisition starts immediately. Sequence WRAP in Normal is the same as in Single-Shot Mode. LCXXX-

20、OM-E Rev KISSUED: December 1999? / or use Peak Detect and the external clock, where available. “TIMEBASE” indicates the number of points acquired, sample rate, and total time span. L LC C3 33 34 4, , L LC C3 37 74 4, , L LC C5 53 34 4, , L LC C5 57 74 4, , a an nd d L LC C6 68 84 4 S SE ER RI IE ES

21、S 6DPSOLQJ For selecting either of the two principal modes of acquisition: ? Single Shot displays data collected during successive single- shot acquisitions from the input channels. This mode lets you capture non-recurring or very low repetition-rate events simultaneously on all input channels (see

22、page 71). ? RIS (Random Interleaved Sampling) achieves a higher effective sampling rate than Single-Shot, provided the input signal is repetitive and the trigger is stable (see page 72). 6DPSOH?7(51$/These menus appear when an external clock mode (ECL, OV, TTL) is chosen from “Sample Clock”. 6DPSOLQ

23、J This menu is inactive when the external sample clock is being used. Single-Shot is selected by default. 6DPSOH? see menus on page 77)?Select 4 to activate all input channels or 2 to combine a pair of channels on both CH 2 and CH 3. Select 1 (NOT AVAILABLE ON SERIES LC564 ) to combine all channels

24、on CH 2 alone. Automatic optimizes allocation of sample rate and acquisition memory across the channels: all available resources are allocated to a single displayed channel provided none of the other channels is displayed or referenced in the Parameter or Math Setup. This auto-combine mode is also t

25、he best choice when you are using a remaining acquisition channel for triggering (see page 75). 6HTXHQFH This feature turns Sequence mode on or off, or selects Wrap (if available) to acquire new segments continuously. When On or Wrap is chosen, the associated menu knob is used to choose the number o

26、f segments. 0D?VHJPHQW Along with the corresponding button or knob, this feature selects the maximum record length, in samples, for each segment. See Appendix A for model maximums. LCXXX-OM-E Rev K?ISSUED: December 1999? / negative to negative edge. Interval Trigger captures intervals that are short

27、er or longer than a given time limit. In addition, a width range can be defined to capture any interval that falls in or out of the specified range an Exclusion Trigger by Interval. Figure 89. Interval Trigger Menus (see page 838). ,QWHUYDO?$SSOLFDWLRQVInterval Trigger is helpful for determining mis

28、sing cycles or transitions, and for ignoring unwanted signal reflections. Interval Trigger on Coupling Between Neg, Pos edges DC, AC, LFREJ, HFREJ 1, 2, 3, 4, Ext, Ext10, or Ext5 depending on model, Pattern Interval: less than or equal to Off, Time Interval: greater than or equal to Off, Time LCXXX-

29、OM-E Rev KISSUED: December 1999? / T2 = its upper limit. The broken upward-pointing arrow indicates a potential trigger, while the bold one indicates where the actual trigger occurs on the positive edge within the selected range. This example shows a positive slope, range limits of 10.0 ns and 5.4 m

30、s, selected. Interval Width Generated Trigger Trigger can occur Trigger Source: Positive Slope 00T1T1T2T2 RangeRange Interval Width ?ISSUED: December 1999LCXXX-OM-E Rev K 7ULJJHUV?DQG?:KHQ?WR?8VH?7KHP ,QWHUYDO?2XWVLGH?5DQJHThis Interval Trigger is generated whenever an interval between two edges of

31、the same slope falls outside a selected range (Fig. 813). The trigger is generated on the second edge if it occurs after the selected interval range. The timing for the interval is initialized and restarted whenever the selected edge occurs. Intervals of between 10 ns and 20 s (2 ns and 20 s for the

32、 LC564, LC584, AND LC584 SERIES ) can be selected. Figure 813. Interval Trigger that triggers when the interval falls outside the selected range: T1 = the ranges lower time limit; T2 = its upper limit. The broken upward-pointing arrow indicates a potential trigger, while the bold one shows where the

33、 actual trigger occurs, on the positive edge outside the selected range. This example shows a positive slope, and range limits of 10.0 ns and 347.5 ns selected. “OR” means that intervals above or below the range have been targeted. Interval Width Generated Trigger Trigger can occur Trigger Source: P

34、ositive Slope 00T1T1T2T2 RangeRange Interval Width LCXXX-OM-E Rev KISSUED: December 1999? / and Edge-Qualified, for which the validation is sufficient and no additional requirement is placed on the first signal (for the separate, Qualified First Trigger, see page 824). A Qualified Trigger can occur

35、immediately after the validation or within a set time after it. Or it can occur following a predetermined time delay or number of potential trigger events. The time delay or trigger count is restarted with every validation. Figure 816. State- and Edge-Qualified Trigger Menus (see pages 840 and 841).

36、 Qualified By Trigger on After Edge|State qualifier Has gone Above|Below value Within Wait Off|Time | Evts 1|2|3|4|Ext|Ext10 or Ext5 depending on model |Pattern 1|2|3|4|Ext|Ext10 or Ext5 depending on model Qualified By Trigger on Only after 1|2|3|4|Ext|Ext10 or Ext5 depending on model |Pattern 1|2|3

37、|4|Ext|Ext10 or Ext5 depending on model Edge|State qualifier Goes and stays Above|Below value Off|Time | Evts Within Wait LCXXX-OM-E Rev KISSUED: December 1999? / low when it is less. For example, a pattern might be defined as present when the trigger states for Channels 1 and 2 are high and EXT is

38、low. If any one of these conditions is not met, the pattern state is considered absent. Qualified Triggers allow an additional qualification once the selected pattern state occurs. For example: “wait for 10 ns up to 20 s, trigger on CH 1 to the 99 999 999th event.” The pattern is used to qualify the

39、 trigger without actually generating it. Triggering will occur when another signal, the trigger source, meets its trigger condition while the pattern is present. The trigger source itself is not allowed in the pattern. 4XDOLILHG?$SSOLFDWLRQVTypical applications can be found wherever time violations

40、occur, such as in micro-processor debugging, or telecommunications. 6WDWH?4XDOLILHG?ZLWK?:DLWState-Qualified Trigger with Wait (Fig. 817) is determined by the parameters of Time or the number of Events: ? Time determines a delay from the start of the desired pattern. After the delay (timeout) and wh

41、ile the pattern is present, a trigger can occur. The timing for the delay is restarted when the selected pattern begins. ? Events determines a minimum number of events of the trigger source. An event is generated when a trigger source meets its trigger conditions. On the selected event of the trigge

42、r source and while the pattern is present, a trigger can occur. The count is initialized and started whenever the selected pattern begins, and continues while the pattern remains. When the selected count is reached, the trigger occurs. This example shows a State-Qualified-with- time-Wait trigger: po

43、sitive slope, 2 ns delay, “goes and stays Above” -24 mV. ?ISSUED: December 1999LCXXX-OM-E Rev K 7ULJJHUV?DQG?:KHQ?WR?8VH?7KHP Figure 817. State-Qualified by Wait: Trigger after timeout. The broken upward-pointing arrows indicate potential triggers, while the bold arrows show where the actual trigger

44、s occurs. As the above figure illustrates, a trigger is generated on a rising edge whenever the pattern is asserted (pattern present) and the wait timeout has expired. The timeout is activated or disabled once the pattern is asserted or absent, respectively. This example shows an Edge-Qualified-with

45、-event Wait trigger on CH 2 (described next page): positive slope, wait of 109 events, level of 2.50 V, and pattern present as indicated. Generated Trigger Wait Trigger Source: Positive Slope Trigger can occur Qualifier: Pattern Present Wait LCXXX-OM-E Rev KISSUED: December 1999? / “8” for SECAM sig

46、nals. ? 525/60/2:1 (NTSC systems) This setting should be used for standard 60-field NTSC signals. The lines can be selected in the range 1 to 1051, where line 1051 is identical to line 1. Number of fields: “4” is most useful for US-type NTSC systems. ? ?/50/?, ?/60/? In order to allow maximum flexib

47、ility, no line-counting convention is used. The line count should be thought of as a line-synchronizing pulse count. It includes the transitions of the equalizing pulses. For certain extreme cases, the field transition recognition will no longer work, and only the “any line” mode will be available.

48、? The enhanced field-counting capability cannot be used for RIS acquisitions. ? Composite video signals must have negative-going synch to be decoded correctly. ?ISSUED: December 1999LCXXX-OM-E Rev K 7ULJJHUV?DQG?:KHQ?WR?8VH?7KHP URSRXW?7ULJJHUDropout Trigger (Fig. 822) provides triggering whenever t

49、he signal disappears for a set period of time. The trigger is generated at the end of the time-out period following the “last” trigger-source transition, as shown in the figure on the next page (Fig. 823). Time-outs of between 25 ns and 20 s (2 ns and 20 s for the LC564, LC584, AND LC684 SERIES) can be selected. Figure 822. Dropout Trigger Menus (see page 842) URSRXW?$SSOLFDWLRQVDropout Trigger is useful for detecting interruptions in data streams such as network hang-ups and microprocessor crashes.