Trigger Controls
TDS3000 Series User Manual
3–53
After the A trigger event is recognized, the oscilloscope begins
counting B trigger events. 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 following figure, where n=3
and A and B trigger slopes are set to rising edge.
Arming
event A
Trigger
event B
(for n=3)
123
Arming
event A
Trigger
event B
(for n=3)
Trigger point
1234 (n+1)
≥5 ns
T
T
Opposite-polarity edge
Trigger point
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