LeCroy_9210_Pulse_Generator_Operators_Manual 电路图.pdf

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1、Operators Manual Model 9210 300 MHz Programmable Pulse Generator March 1, 1995 Rev. B RadioFans.CN 收音机爱 好者资料库 LeCroy Innovators in Instrumentation Corporate Headquarters 700 Chestnut Ridge Road Chestnut Ridge, NY 10977-6499 Tel: (914) 578-6020, Fax: (914) 589-5985 European Headquarters 2, chemin-Pre

2、-de-la Fontaine 1217 Meyrin 1 Geneva, Switzerland Tel.: (022) 719 21 Copyright March 1, 1995, LeCroy. All fights reserved. Information in this publication supersedes all earlier versions. Specifications subject to change without notice. RadioFans.CN 收音机爱 好者资料库 TABLE OF CONTENTS 3 9210 QUICK START .1

3、 Purpose .1 Quick Start Instructions .1 GEI-IING AROUND THE FRONT PANEL .5 Accessing the Control Displays .5 Selection of Parameters . 6 Adjusting Parameters with the Numeric Keypad .7 Adjusting Parameters with the Rotary Knob .7 Non-Numeric Entries . 8 Storing 115/220 VAC _.20%, 48 Hz to 448 Hz. Th

4、e 9210 will automatically adjust to the local line voltage. 3) Make certain that the Main Circuit Breaker/Line switch, on the rear panel, is in the ON position. 1 9210 Quick Start I/ SELECTDISPLAYGPIB POWER N-l/ HI DiS I t . J- .),nput output Pu.sE-,E,ro, 9210 J / Vlow Width I 2.00ns I Delay I 2.00n

5、s I Lead -Jl 1.00ns I Trail L I-. 1.00ns 12 Pulse I . OFF Main IPeriod 10.00ns I No,m, I sO I 4) Push the front panel POWER key. The 9210 will perform power-up calibration for approximately 30 seconds, then display the Channel A control menu screen. 5)Most of the pulse parameters and their controls

6、are accessed by touching the CRTkeys on the TouehCRT. Throughout this manual, the following symbols will be used to distinguish soft CRTkeys from actual front panel pushbuttons: WidthCRTkey Invert Front Panel Key 6) Touch Period. The key should highlight. 7)Release the CRTkey and turn the Outer Ring

7、 Knob (range). The Period changes in a 1-2-5 sequence. 9210 Quick Start 1 8) Turn the Center Knob (vernier). The Period will change smoothly. 9) Try varying the sensitivity of the vernier Knob using the keys. 10) Change the Period to 1.5 microseconds by pressing 11, .1, 51, u/MHzl. 11) Press Recall

8、Setup, and touch Standard and Execute to recall the factory default setup. The generator will now be in the NORMAL trigger mode, which is free running. 12) Connect the OUTPUTof the Module to a vertical input of an oscilloscope with a 50 cable, terminated at the scope end. 13) Press Disable on the Mo

9、dule to enable the Output. Adjust the scope to see the Pulse stream. Verify that the parameters on the generators CRT match those of the scope trace. 14) Touch Vhigh, and turn the vernier knob to vary the Pulse high level. 15) The pulse parameters are defined below. Vary each and observe its effect

10、on the scope trace. Note that the highlighted portion of the pulse icon on the displays upper right indicates graphically what has been selected for adjustment. Vhigh Vlow High level. This is the active level if Invert is not on. Low level. This is the quiescent level if Invert is not on. 19210 Quic

11、k Start Width Delay Lead Trail NOTE: 2 Pulse Period Pulse Width is measured from the start of the leading edge to the start of the trailing edge. Delay of the module Pulse output from the Trigger output, not including a fixed delay of typically 13 nsec. This also controls the time between the 2 puls

12、es in double pulse mode. Leading edge transition time, 10% to 9O%. Trailing edge transition time, 10% to 90%. Transition times (Lead and Trail) cannot be varied in the 9214 module. Turns double pulse mode ON or OFF. Defines the time between Output Pulses in NORMAL, GATE and BURST trigger modes. 2GET

13、TING AROUND THE FRONT PANEL Accessing the Control Displays DISPLAY Control Menus are brought to the 9210s display by pressing one of the five blue DISPLAY keys on the front panel. Press TRIGGER once to bring up the main Trigger control menu display. Press TRIGGER again and a second page of less freq

14、uently used trigger controls will be displayed. Repeated presses of the key will toggle the display between these two menus. The other four DISPLAY keys operate in a similar manner. See the table below for details. Keys Ion module) Display Channel Parameter Menu (2 pages) T.,Q. Trigger Parameter Men

15、u (2 pages) ,o., Utilities and Features Menu .E. On-Screen Operating Summary 2Getting Around the Front Panel Selection The selected parameter is the one that is highlighted (backlit). Parameters are selected by touching their corresponding CRTkey, or by pressing the SELECT 1, ,l, keys on the front p

16、anel until the desired parameter is highlighted. Note that when making selections with the CRTkeys, the selection process is not completed until the key is released. Channel A Page I Vhigh I VlowI WidthI Delay J Lead .:rol. Trail LI 2 Pulse Main J Period I JNormal ,1 SO I Boomv - OV 2.00ns 0.00ns 1.

17、00ns 1.00ns -OF F 10.00ns DIS I NOTE:If a 9214 module is installed in one of the module bays, the Lead and Trail CRTkey$ will not be displayed in that channels menu. 6 Getting Around the Front Panel 2 Adjusting Parameters with the Numeric Keypad A precise value for the selected parameter can be ente

18、red by pressing the numbers on the numeric keypad. Each number pressed will be displayed in the information window at the bottom of the CRT. The Back Space key is provided for deleting erroneous key presses. The +/- key will toggle the sign of the number being entered, and may be pressed at any time

19、 before terminating entry. After the sign and numeric portion of the desired value have been punched in, entry with the appropriate multiplier is terminated by pressing one of the four unit/entry keys (n/GHz, u/MHz, m/kHz, or Enter/Hz) at the right of the keypad. Adjusting Parameters with the Rotary

20、 Knob Continuous adjustment of the selected parameter can be accomplished using the concentric Rotary Knob. The Outer Ring Knob (range select) will set the parameters value in a 1-2-5 Sequence. As a convenience, if the Outer Knob is rotated by only one position and then turned back, the original val

21、ue will be restored, even if that value was not a 1, 2 or 5. The Center Knob (vernier) will change the value in a continuous, analog fashion. The sensitivity of the vernier Knob is controlled by using the Digit select keys located below the Knob. The Digit - key will move the selected digit to the r

22、ight, for finer adjustment, and the -Digit key will move the selected digit left, for more coarse adjustment. Note that the 4005 400 OFF Channel Menu showing Alternate Parameter Formats. NOTE: In a 3rd vertical format, the 2nd line is Median. Pressing CHANGE FORMAT with either Vhigh or Vlow selected

23、 will change the display for both parameters. The second vertical format controls the Output Pulse in the following manner: Ampl:This is the Pulse Amplitude, i.e., the difference between the quiescent and active levels of the Output Pulse. Base:This is the quiescent level of the Output Pulse. Note t

24、hat this value changes when the Output Pulse is inverted. 16 Channel A - Period 2 Pressing CHANGE FORMAT while Width is selected changes this parameters display toDuty Cy. This changes the mode of control over the duration of the Output Pulse as follows: Duty Cy:Duty Cycle defines the percentage of

25、the Period (see below) over which the Output pulse is in the active state. In Duty Cy mode, the Output Pulse duration varies proportionally with the Period, while in Width mode the duration is unaffected by Period. 19 3Channel A . Vhlgh 1 . Output PulIie, 9Amp, m I / . - - .d,sn Invert Off, , . rAmp

26、 12 iiD Ii 0D0 00 uu o0 | : ; . .Vhlgh or Base Bmmm . , ,(-Arnpl) -, . t t / T AmpI/2 Output Pulle,lnvert On r (Ampl) .Ampl .t-plan . *- v,ow. . .X - Width Notes: 1) Duty Cycle = (Width ! Period) X 100% 2) Phase = (Delay / Period) X Guided by the requirements of your application, select from among t

27、he indicated parameters those which can be altered to both resolve the conflict and satisfy the demands of your measurement. The following conditions must be true in order to avoid conflict: 1) Vhigh Vlow 2)Lead Min. Amplitude 4) Vhigh - Vlow _ Max. Amplitude 5) 1.25 X Lead Width 28 Channel A Trigge

28、r Controls 4 In Burst Trigger Mode, a programmed number (the Burst Count) of pulses are output for each trigger. The Trigger Outputs width will be equal to Period X (Burst Count- 1). External Trigger Input Trigger q Output Delay .+ Offset Output Pulse J i I ,Width iPeriod One Trigger Output follows

29、each trigger by =21 nsec. The Trigger Output width will be equal to the Period times the Burst Ct -1. Delay (+ = 13 nsec) specifies the time from the leading edge of the Trigger Output to the leading edge of the first Output Pulse, the time between Output Pulses is specified by Period and the durati

30、on of each Output Pulse is specified by Width. NOTE: To allow the 9210s internal timing generator circuits to fully re-initialize, there is a minimum re-trigger interval (i.e. dead time) 50 nsec after the completion of the last Output Pulse in Burst Mode. 45 4Trigger Controls External Width Mode InE

31、xternal Width Mode, the signal at the Ext Input is reproduced at the Output with programmable transition times and voltage levels - J I Input | - II Output J , Uellly U/lllel I 1 ( -13 nlec) el Output Pulse, / Trigger Slope Positive i i Trigger Slope Negative In Ext wid (external width) mode, the si

32、gnal at the Ext Input is reproduced at the Module Output with programmable transition times and output voltage levels. If the trigger Slope (see Setting the Trigger Level and Slope below) is set to Negative, the modules normal output will be inverted with respect to the Ext Input. If Slope is Positi

33、ve, the normal output follows the Ext Input directly. A Trigger Output follows each input signal by -21 nsec, and the width of the Trigger Output will be roughly equal to that of the external input signal. The Output Pulse follows the Trigger Output by the -13 nsec delay offset. 46 Trigger Controls

34、4 Double Pulse Interactions Normal Mode Single Mode Gate Mode Burst Mode Delay, Width and Period adjustments made when the generator is in Ext wid mode will become effective when the Trigger Mode is changed, but these settings are meaningless in External Width mode. The front panel Manual Trigger Bu

35、tton can be used to simulate an input signal in Ext wid mode. The output will remain in the active state for as long as the button is held in. The interaction of Double Pulse operation with the various Trigger Modes is detailed below. Note that while the Trigger Mode is common to both channels, 2 Pu

36、lse can be enabled in either channel independently of the other. Two Output Pulses follow each Trigger Output rather than 1. The first will trail the Triggers leading edge by the double pulse delay offset of .-11 nsec, and the second will follow the first by the Delay. Same as Normal Mode, except th

37、at triggers must be received from some external source. Again, the same as Normal Mode, except only while the signal at the Ext Input is in the true state. (See Setting the Trigger Level and Slope below.) In this case Burst Ct specifies the number of Output Pulse pairs, rather than the number of Out

38、put Pulses, per trigger. The first pulse of the first pair in any burst will follow the leading edge of the Trigger Output by =11 nsec, the second pulse in any pair follows the first by Delay, and the first pulse of any pair follows the first pulse of the previous pair by Period. 47 4Trigger Control

39、s External Width Mode Ext wid Mode is incompatible with Double Pulse operation, i.e., its function is unaffected by the state of 2 Pulse. Setting the Trigger Level and Slope The user may specify the point on the Ext Input signal at which the generator will trigger by utilizing the Slope and Level CR

40、Tkeys. The control provided by these keys is as follows: Level selects the voltage threshold that must be crossed by the Ext Input signal in order to trigger the 9210. Level can be set to any value between 2.5 V with 20 mV. Slope determines the direction of the transition (Positive or Negative) thro

41、ugh the specified voltage Level that will trigger the generator. Slope may also be set to Disable, in which case the generator will not respond to the extemal input at all. In External Width mode, setting Slope to Negative causes the pulse at the modules normal output to be inverted with respect to

42、the signal at the Ext Input Setting the Trigger Level Automatically Auto Ivl is an action key which enables the 9210 to determine an appropriate setting for Level such that the 9210 will trigger on the edge of the Ext Input signal specifiedby Slope (if Slope is set to Disable, executing Auto Ivl wil

43、l reset it to Positive). It will take a few seconds for the proper level to be found. Touching Auto IvI and Execute with no signal (or an inappropriate signal) connected to the Ext Input will bring an error message to the screen. 48 Trigger Controls4 Parameter Limits and Triggering Setting the Inter

44、nal Trigger Rate Using The Manual Trigger Button When the maximum Width or Delay settings are approached (within about 500 psec) in Single trigger mode, the error message TRIGGER TOO FAST may appear in the information window. This occurs because the Width or Delay timing generator circuit has been r

45、e- triggered before it has recovered from the previous trigger. The message is meant to indicate that a trigger may have been missed. However, if a trigger is received during the first 500 psec after the timing generator asserts that it is actually ready to re-trigger, the error detection circuitry

46、may still trip and produce the error message. In Normal Trigger Mode, the 9210 triggers itself at a rate determined by the Period parameter, which can be adjusted from the bottom line of the first page of the Trigger menu display, just as it can on the Channel Menus. (Internal triggers are also utilized in Gate and Burst Modes, but only after an external trigger has started the period generator.) The Freq format may also be used. See the section entitled Controlling Repetition Rate in Chapter 3 for further details. Pressing the Manual trigger button on the front panel i