Reference
After the A trigger event is recognized, the oscilloscope begins counting B trigger
event
s. However, for the first B event to be counted, that event must consist of
both an opposite-polarity edge and the edge that is counted. The opposite-polarity
edge must occur ≥ 5 ns after the A trigger arming event. If this condition is not
met, the oscilloscope does not count the first event, which results in a trigger on
the n+1
st
event. Refer to the next figure, where n=3 and A and B trigger slopes
are set to rising edge.
TDS3000C Series Oscilloscope User Manual 93
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