Teledyne LeCroy LabMaster 9Zi-A - Manual (Page 143)

Getting Started Manual
922157-00 Rev A 135
3. If available, touch inside the Coupling control and select a coupling
mode.
Coupling refers to the type of signal coupling at the input of the
trigger circuit. Choices of trigger coupling vary by oscilloscope
model. With DC coupling, all of the signal's frequency components
are coupled to the trigger circuit for high-frequency bursts.
4. Touch inside the trigger Slope control and choose the direction of
the trigger voltage transition used for generating a particular trigger
event.
The selection is then shown to the right of the dialog as follows for a
Positive Slope selection on an Edge Trigger.