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Trigger Menu
Use the Trigger menu to set up the instrument to trigger on live waveforms. Several different types of
triggering are available.
Trigger Setup Control Window
Access this control window from one of the Trigger Setup commands on the Trig menu or click the Trig
taskbar button.
Overview
Use the Trigger Setup control window to set up the instrument to trigger on live waveforms.
The left side of the control window contains information on the main trigger types (also known as
the A Event triggers), sequential triggering, the B Event trigger, and the Trigger Mode and
Holdoff. When you click one of the buttons on the left side of the control window, the right side of
the control window displays details on the trigger type.
The trigger expression near the top right side of the trigger window provides a one-line summary
of the conditions that must be fulfilled before the instrument will trigger.
The trigger event establishes the time-zero point in the waveform record. All points in the record
are located in time with respect to the time-zero point. The instrument continuously acquires and
retains sample points to fill the pretrigger portion of the waveform record. When a trigger event
occurs, the instrument starts acquiring samples to build the posttrigger portion of the waveform
record. Once a trigger is recognized, the instrument will not accept another trigger until the
acquisition is complete and the holdoff time has passed.
Note
If you select an inverted channel waveform as a trigger source, the normal waveform is used
instead.
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