To specify the slope of the trigger signal edge: Press [Trigger] > Trig Out Setup > Trig Out Off | (Up) | (Down).
SCPI Command
TRIGger[1|2]:SOURce {IMMediate|EXTernal|TIMer|BUS}
TRIGger[1|2]:SLOPe {POSitive|NEGative}
See Triggering for more information.
Trigger Out Signal
See Trigger Output Signal for more details.
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Keysight EDU33210 Series User's Guide