Teledyne LeCroy LabMaster 9Zi-A - Manual (Page 144)

LabMaster 9 Zi-A
136 922157-00 Rev A
Edge trigger works on the selected edge at the chosen level. The slope (positive or
negative) is specified on the Trigger label shown at the lower-right of the grid.
5. Level defines the source voltage at which the trigger circuit
generates an event (a change in the input signal that satisfies the
trigger conditions). The selected trigger level is associated with the
chosen trigger source.