Agilent Technologies 8566B Operating And Programming Manual page 300

Video Trigger
The KSy command activates the normal video trigger mode, but eliminates the automatic refresh for sweeptimes
less than 20 msc. (The T4 and TM commands do not inhibit the automatic refresh.) The functions of the KSy
command and the front panel (,., '
Trigger keys are identical.
When the KSy command is executed, the RF input signal is displayed only when the video trigger signal, which is
internally triggered off the input signal, exceeds the threshold of the trigger level.
OTJTPUT 718;"KSy;"
Programming 19 1