Teledyne LeCroy WaveMaster 8 Zi_Zi-A - Manual (Page 36)

WaveMaster 8 Zi/Zi-A Oscilloscopes
28 922133-00 Rev A
There are several indicators on the grid to help you understand the
following:

Trigger Delay - This indicator is located along the bottom edge of the
grid. Trigger delay allows you to see the signal prior to the trigger
time.
All trigger delay values (including post-trigger delay, shown here) are
displayed in the Timebase Descriptor Label. Zero delay is the
horizontal center of the oscilloscope display.
The default setting (Time) is for delay readout (in seconds) and to
move proportionately when the timebase knob is turned. If you
want to set delay (Div) to a fixed position on the grid, and then have
it stay fixed as the timebase changes, go to Utilities → Preference
Setup... and select the Acquisition dialog to make the setting.

Post-trigger Delay - This is indicated by a left-pointing arrow to the
lower-left of the grid. Pre-trigger delay is indicated by a right-
pointing arrow to the lower-right of the grid.

Trigger Level - This indicator is located at the right edge of the grid.
It tracks the trigger level as you reposition the trace up or down, or
change scale. When triggering is stopped, a hollow arrow indicates
where the new level ends up when triggering resumes.