Teledyne LabMaster 10 Zi Series Operator's Manual page 63

LabMaster 10 Zi Oscilloscopes
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.
Push the LEVEL knob to reset the level to 50%.

Zero Volts Level - This indicator is located at the left edge of the
grid. Change the zero volts level by turning the vertical OFFSET
knob. Push the knob to reset the indicator to the middle of the
grid.
56 LM10Zi-GSM-E Rev A