User manual

PicoScope 6 User's Guide 175

9.4

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 scope view with

post-trigger delay enabled:

Note 1. The trigger reference point ( ) does not lie on the waveform. This is because

the post-trigger delay is set to 200 µs, which means that the trigger occurred

200 µs 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

200 µs.

Note 2. The pre-trigger delay is set to 25%, which makes the trigger reference point

appear 25% of the way across the scope view from the left-hand edge.

Note 3. PicoScope limits the trigger-to-reference-point delay to a multiple of 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. The multiple is typically 100 in most trigger modes, and 1 in ETS mode.