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PicoScope 6 User Guide
65
Copyright 2006 Pico Technology Limited. All rights reserved.PSW044-2.0
9.2
Trigger timing (part 1)
The pre-trigger time control and post-trigger delay control functions are
described individually under "Triggering toolbar ", but the interaction between the
two controls is also important to understand. Here is a screen shot of a capture
window with post-trigger delay enabled:
First, notice that the trigger reference point ( ) does not lie on the waveform. This is
because the post-trigger delay is set to 3.3 ms, which means that the trigger occurred
3.3 ms before the reference point, somewhere off the left-hand edge of the scope
view. The time axis is aligned so that the trigger reference point is at 3.3 ms.
Second, the pre-trigger delay is set to 30%, which forces the trigger reference point to
appear 30% of the way across the scope view, measured from the left-hand edge.
Third, PicoScope often limits the trigger-to-reference-point delay to the total capture
time. Once you have reached this limit, the program will not let you increase the pre-
trigger delay, and if you increase the post-trigger delay, PicoScope will reduce the pre-
trigger delay to stop the total exceeding the limit.
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