Trigger Controls
3–56
TDS3000 Series User Manual
Bottom Side Description
L
Level Use to set the trigger level with the
general purpose knob.
Set to TTL Sets the trigger level to +1.4 V for TTL
logic.
Set to ECL Sets the trigger level to –1.3 V for ECL
logic (V
ee
= –5.2 V).
Set to 50% Sets the trigger level to the 50%
amplitude level of the signal.
M
d
& H
d
ff
Auto (untriggered
roll)
Enables free-running and roll-mode
acquisitions.
Normal Triggers only on valid trigger events.
Holdoff (time) Sets holdoff to a specific time.
Holdoff (% of re-
cord)
Sets holdoff to a percent of the record
duration.
Set to Min Sets holdoff to the minimum value.
Key Points
Displaying the Trigger Source. You do not have to display a channel to
use it as a trigger source.