Teledyne LeCroy WaveExpert 100H Operators Manual - Manual (Page 93)

Wave Expert
WE-OM-E Rev A
91
Determining Trigger Level, Slope, Source, and Coupling
Level -- Defines the voltage at which the trigger circuit will generate an event and cause a sampling
strobe to be generated. This control is only available when the Trigger source is selected.
Coupling -- The Trigger input is DC coupled with a 50W load. The Prescale input is AC coupled
with a nominal 50W load
Slope -- Determines the direction of the trigger voltage transition used for generating a particular
trigger event. You can choose a positive or negative slope. This control is only available when the
Trigger input is selected.
Control Edge Triggering
Horizontal: Turn the Delay knob in the HORIZONTAL control group to adjust the trigger's
horizontal position. Or, touch inside the Delay field in the timebase setup dialog and enter a value,
using the pop-up keypad.
The trigger location is shown by a marker below the grid.
Post-trigger delay is indicated by a left-pointing arrow below-left of the grid. Since the
sampling system does not acquire data until a trigger signal is present, the delay can never be
positive. The minimum delay for the sequential mode is -12 ns. The CIS timebase runs
continuously when a clock is present and has a minimum delay of 0 ps. In this case, the position
arrow appears at the left edge of the screen.
Vertical: Turn the L EVEL knob in the TRIGGER control group to adjust the trigger's
vertical threshold when the trigger signal is applied to the Trigger input. This control knob has no
affect when the Prescale input is being used.
Alternatively, in the "Trigger" dialog, you can touch inside the Level field and type in a value, using
the pop-up numeric keypad. To quickly set a level of zero volts, touch the Zero Level button directly
below the Coupling field.
The trigger source and level are indicated in the trigger descriptor label: