HP 1660CS, User Manual

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The minimum pattern duration time can be any value between 20 ns and 160
ms in 10 ns steps. The maximum pattern duration time must be at least
10 ns greater than the minimum time value.
If the count set in the Count field is one, the trigger event will be the first
pattern event that meets both the pattern specification and the duration
specification. If the count is greater than one, only the first pattern event
must meet the duration specification. Once the pattern duration
specification has been met, subsequent pattern events that meet the pattern
specification can be of any duration and each such pattern event will
contribute to meeting the count specification. For instance, with a pattern
specification of HX, a duration specification of >60 ns & <100 ns, and a count
of 3, a pulse string with pulse widths 200 ns, 80 ns, 150 ns, 50 ns, 75 ns, 20 ns
would trigger on the trailing edge of the 50ns pulse. In this example, the 80
ns pulse meets the duration specification and is count 1, the 150 ns pulse is
count 2, and the 50 ns pulse is count 3.
Count field
In pattern trigger mode, you can define a pattern as a trigger qualifier. When
the oscilloscope detects the trigger qualifier, it will trigger when the number
of patterns specified in the Count field have occurred on all inputs.
The Count field defines the number of events that must occur after the first
trigger qualifier before the oscilloscope will trigger and acquire a waveform.
Count can be set to any integer from 1 to 32,000. The default value for the
Count field is 1.
The Scope Trigger Menu
Count field
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