Teledyne Lecroy WaveSurfer 3000, Operator'S Manual, Page: 42 / 97

WaveSurfer 3000 Oscilloscopes
Trigger Settings
To access the Trigger setup dialogs, choose Trigger > Trigger Setup from the menu bar, or press the front panel
Trigger Setup button.
The dialogs you see and the options on them will vary depending on your trigger type selection. The main Trigger dialog
contains settings that are required for most trigger types.
Type - see Trigger Types for details. This selection drives the remainder of the trigger setup. The default selection is
Edge.
Source - the channel signal upon which to base the trigger. If a trigger is designed to work with multiple inputs, like a
Pattern trigger, you do not have to choose a single source, but will be given controls for setting the conditions on each
source.
Coupling - the type of signal coupling at the input. Choices are:
l
DC - All the signal’s frequency components are coupled to the trigger circuit for high frequency bursts or where
the use of AC coupling would shift the effective trigger level.
l
AC - The signal is capacitively coupled. DC levels are rejected, and frequencies below 10 Hz are attenuated.
l
LFREJ - The signal is coupled through a capacitive high-pass filter network, DC is rejected and signal frequencies
below 400 kHz are attenuated. For stable triggering on medium to high frequency signals.
l
HFREJ - Signals are DC coupled to the trigger circuit, and a low-pass filter network attenuates frequencies above
1 MHz (used for triggering on low frequencies).
Level - the source voltage level or levels that mark the threshold for the trigger to fire. Trigger levels specified in Volts
normally remain unchanged when the vertical gain or offset is modified.
Find Level - where available, this button sets the Level to the signal mean.
The trigger setup is summarized in a preview window at the far right of the Trigger dialog.
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