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 source 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 waveform.
: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
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