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Figure 24. Oscilloscope trace of an external trigger. See text.
The upper trace is the exposure signal, the lower trace is from the pulse
generator being used as a trigger. For this external trigger, “ni” is 3, the
“delay” is 0.005 s, “expt” is 0.016 s and “expp” is 0.06 s. Only the first positive
edge of the trigger is used.
Because the external trigger relies upon the module’s internal clock signal to
start the timing of the exposure, there is a delay and jitter between the trigger
signal and the start of the first exposure. The maximum jitter is ~15 ns with an
average delay of 177 ns.
Figure 25. Delay and jitter.
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