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For example, to achieve a stable trigger on the repetitive pulses shown in the figure
below set the holdoff time (t) to 200 ns < t < 600 ns.
Holdoff by Event
The holdoff event is the number of events that the oscilloscope counts before re-arming
the trigger circuitry. The oscilloscope will not trigger until the counter tracking holdoff
events reaches the set value. In the following figure, the holdoff event is set to 3, and the
signal is triggered on the fourth edge.
Parameter Start Holdoff On defines the initial position of holdoff
Acq Start
condition. In the example above, each holdoff starts from the first rising edge of the
pulse sequence.
Last Trig Time
above, the last trigger position is at the second rising edge of the pulse sequence and
the second holdoff starts from that point.
15.8 Trigger Coupling
The coupling setting of a trigger is only valid when the trigger source is C1~C4, EXT or
EXT/5.
•
DC: All of the signal's frequency components are coupled to the trigger circuit for high-
frequency bursts or where the use of AC coupling would shift the effective trigger level.
•
AC: The signal is capacitively coupled. DC levels are rejected. See the datasheet for
details of the cut-off frequency.
1.800.561.8187
-- The initial position of holdoff is the first time point satisfying the trigger
--The initial position of holdoff is the time of the last trigger. In the example
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T3DSO2000A Manual. Page 68
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