Oscilloscope R eference Triggering concepts
Triggers create meaningful waveforms from sig nal displays. This instrument has simple edge triggers as
well as a variety of advanced triggers.
The trigger event
The trigger event establishes the time-zero point in the waveform record. All waveform record d ata are
located in time with respect to that point. The instrument continuously acquires and retains enough sample
points to fill the pretrigger portion of the waveform record (that part of the waveform that is displayed
before, or to the left of, the triggering event on screen).
When a trigger event occurs, the instrument starts acquiring samples to build the posttrigger portion of the
waveform record (displayed after, or to the right of, the trigger event). Once a trigger is recognized, the
instrument will not accept another trigger until the a cquisition is complete and the holdoff time h as expired.
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DSA/DPO70000D, MSO/DPO/DSA70000C, DPO7000C, and MSO/DPO5000 Series 693
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