Tektronix TDS5000B Series

TDS5000B Online Programmer Guide
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Example 1
TRIGger:A:VIDeo:LINE?
This query might return
:TRIGger:A:VIDeo:LINE 10
indicating that the instrument is set to trigger on line 10.
Example 2
TRIGger:A:VIDeo:LINE 23
This command sets the instrument to trigger on the line 23.