Tektronix TDS5000B Series

TDS5000B Online Programmer Guide
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Example 1
TRIGger:A:VIDeo:FIELD?
This query might return
:TRIGGER:A:VIDEO:FIELD ALLFIELDS
indicating that the A video will trigger on all video fields.
Example 2
TRIGger:A:VIDeo:FIELD EVEN
This command sets the A video trigger so that it will trigger on even
fields.