The trigger point in a waveform record also sets the zero time-reference point in a
waveform record. By default, the trigger point in a waveform record is in the
center of the waveform record. This means that half of the record shows the
signal waveform before the trigger condition (pretrigger), and the other half
shows the waveform after the trigger condition (post-trigger).
Pretrigger data can help you troubleshoot signal problems. For example, to find
the cause of an unwanted glitch in your test circuit, trigger on the glitch signal
and look at the pretrigger waveform. By analyzing what happens before the
glitch, you may uncover information that helps you find the source of the glitch.
Sampling oscilloscope concepts
TBS1000C Series Oscilloscopes User Manual 39
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