Setting Pre-/Post-Trigger Time

Since the oscilloscope buffers the values even if the trigger condition is not yet fulfilled, values can be displayed afterwards for a definable time (pre-trigger time) before the trigger event happens. The post-trigger time determines the length of time for which the values are shown after the trigger event has happened. The pre- and post-trigger time is collected along the extent of the time axis on the oscilloscope window. If, for instance, the time axis extent of the oscilloscope window is set to 2 seconds, and the ratio between pre-trigger and post-trigger time is 0.4/0.6, the pre-trigger time is 0.8 seconds, and the post-trigger time is 1.2 seconds.

Note
Pre- and post-trigger time can only be set in acquisition mode, with the experiment paused or stopped.

Open the Define display trigger condition window.
Define a trigger condition.
Adjust the ratio between pre- and post-trigger time by moving the Ratio between pre- and post-trigger time slider.
Or
In the Pretrigger [s] field below the slider, enter the pre-trigger time in seconds.
The pre-trigger time cannot be longer than the length of the time axis in the oscilloscope window. The post-trigger time is calculated automatically. It is the difference between the length of the time axis and the pre-trigger time
Activate the Enable after post-trigger again option if triggering is to restart after the post-trigger time has expired.
Click OK.
The settings are accepted.