Important delay timing considerations – BNC 725 User Manual
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Important Delay Timing Considerations
Once the Model 725 has begun a delay sequence, it ignores incoming trigger pulses. There is also
a delay of approximately 10 μs after the completion of a delay sequence while the channel resets
for the next trigger. This effect can be used to skip triggers, but if misunderstood it can cause
unexpected results.
For example, in the diagram below, two trigger pulses arrive 100 μs apart. The channel is
functioning in Delayed Pulse Mode, with a delay of 50 μs and a duration of 45 μs pulse. It would:
receive the first pulse; wait 50 μs; send a 45 μs output pulse; and trigger again at the second pulse.
But the extra 10 μs delay at the end of the sequence will cause the channel to ignore the second
trigger pulse.
t=50
μs
output
pulse sent
t=100
μs second trigger pulse
t=0
μs first trigger pulse
t=105
μs channel ready
for next trigger pulse
t=95
μs delay
sequence ends