MDO3000 Programmer Manual.pdf - 第1105页

Appendix F: Search and T rigger Command Sequence Examples The following are some example comm and sequences tha t show a variety of different searches and triggers. The c ommands in these sequences are not order-d epende…

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Appendix E: Mask/Limit Command Sequence Examples
Command Comment
:MASK:TEST:SAVEIMAGE ON Once the test starts , this command will save a .PNG, .BMP or .TIF file (depending upon the
setting of SAVe:IMAGe:FILEFormat) of the waveform from Channel 1 upon mask violation to a
file in the curr
ent working directory.
:MASK:TEST:
STATE 1
This starts the test.
Next, force
a mask violation. Generate a 300KHz sine wave, 0.22 volt Peak to peak, 0.0 offset.
:ACQUIRE:S
TATE?
This query should return 0, indicating that the acquisitions have stopped, because a violation
has taken pl
ace.
:FILESYST
EM:DIR?
This query
should show that a new waveform and a new screen image file have been saved to
the current working directory.
E-4 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual
Appendix F: Search and Trigger Command Sequence
Examples
The following are some example command sequences that show a variety of
different searches and triggers. The commands in these sequences are not
order-dependent.
To use these examples, connect channel 1, channel 2, channel 3 and channel 4 to
the probe compensation signal located on the right hand side of the front panel.
The search and trigger command group sections contain more information on
general search and trigger concepts. (See page 2-61, Search Command Group.)
(See page 2-76, Trigger Command Group.)
Example 1: Single Threshold Edge Search
Goal: Search the channel 2 waveform and place a mark at each instance where it
crosse
s below a threshold of 1.4 volts.
Command Comment
*RST Resets the oscilloscope. Wait for the reset to complete
(appr
oximately 3 seconds).
:SEL
ect:CH2 1
Turn
s the CH2 waveform on.
:AUT
OSet EXECute
Auto
sets the displayed waveform CH2. Wait for the autoset to
complete (approximately 3 seconds).
:SEARCH:SEARCH1:TRIGger:A:TYPe EDGE Specifies that this will be an edge search (a mark will be placed
when the s ource waveform passes through a specified threshold
lev
el in the specified direction).
:S
EARCH:SEARCH1:TRIGger:A:EDGE:SOUrce CH2
Sp
ecifies the CH2 waveform as the source wa veform.
:S
EARCH:SEARCH1:TRIGger:A:LOWerthreshold:CH2 1.4
Sp
ecifies 1.4 volts as the threshold level.
:
SEARCH:SEARCH1:TRIGger:A:EDG E:SLOpe FALL
S
pecifies the falling edge as the direction.
:
SEARCH:SEARCH1:STATE 1
Turns the search on.
:SEARCH:SEARCH1:TOTal? Returns 4, indicating that CH2 fell below the 1.4 volt threshold 4
times.
:SEARCH:SEARCH1:LIST? Returns a list of the 4 marks:
CH2,11.2411,11.2411,11.2411,-1.5504E-3,
0.0E+0,0.0E+0,0.0E+0;CH2,37.0737,37.0737,37.0737,
-517.0517E-6,0.0E+0,0.0E+0,0.0E+0;CH2,62.9163,62.9163,62.9163,
516.6517E-6,0.0E+0,0.0E+0,
0.0E+0;CH2,88.7489,88.7489,88.7489,
1.5500E-3,0.0E+0,0.0E+0,0.0E+0
MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual F-1
Appendix F: Search and Trigger Command Sequence Examples
Example 2: Sin
gle Threshold Edge Trigger
Goal: Trigger on the channel 2 waveform when the waveform crosses below a
threshold of 1.4 volts.
Command Comment
*RST Resets the oscilloscope. Wait for the reset to complete (approximately
3 seconds).
:SELect:CH2 1 Turns the CH2 waveform on.
:TRIGger:A:TYPe EDG E Specifies that this will be an edge trigger (trigger will occur when the
source waveform passes through a specified threshold level in the
specified direction).
:TRIGger:A:EDGE:SOUrce CH2 Specifies the CH 2 waveform as the source waveform.
:TRIGger:A:LOWerthreshold:CH2 1.4 Specifies 1.4 volts as the threshold level.
:TRIGger:A:EDGE:SLOpe FALL Specifies as falling edge as the direction.
:TRIGger:STATE? Should return TRIGGER, not A UTO.
Example 3: Dual Threshold Runt Search
Goal: Search the channel 3 waveform for negative runt pulses and place a markat
each
instance when the waveform drops below an upper threshold of 1.4 volts, but
does not cross a lower threshold of -2 volts before re-crossing the upper threshold.
The pulse width must be less than 600 microseconds.
Com
mand
Com
ment
*R
ST
Re
sets the oscilloscope. Wait for the reset to complete
(approximately 3 seconds).
:SELect:CH3 1 Turns the CH3 waveform on.
:AUTOSet EXECute Autosets the displayed waveform CH3. Wait for the autoset to
complete (approximately 3 seconds).
:SEARCH:SEARCH1:TRIGger:A:TYPe RUNT Specifies that this will be a runt search (a mark will be placed on
a pulse amplitude that crosses one threshold but fails to cross a
second threshold before re-crossing the first).
:SEARCH:SEARCH1:TRIGger:A:EDGE:SOUrce CH3 Specifies to use channel 3 as the source waveform.
:SEARCH:SEARCH1:TRIGger:A:LOWerthreshold:CH3 -2 Specifies to use -2 volts as the lower threshold.
:SEARCH:SEARCH1:TRIGger:A:UPPerthreshold: CH3 1.4 S pecifies to use 1.4 volts as the upper threshold.
:SEARCH:SEARCH1:TRIGger:A:RUNT:PO Larity NEGative Specifies to search for when the runt polarity is negative.
:SEARCH:SEARCH1:TRIGger:A:RUNT:WIDth 600E-6 Specifies a pulse width of 600E-6 seconds.
:SEARCH:SEARCH1:TRIGger:A:RUNT:WHEn LESSthan Specifies to search for when the pulse width is less than
600E-6 seconds.
:SEARCH:SEARCH1:STATE 1
Turns the search on.
F-2 MDO4000/B/C, MSO/DPO4000B and MDO3000 Series Oscilloscopes Programmer Manual