Trigger Holdoff - Teledyne HDO9000 Operator's Manual

Trigger Holdoff

Holdoff is either a period of time or an event count that may be set as an additional condition for Edge
and Pattern triggers. Holdoff disables the trigger temporarily, even if the other conditions are met.
Use Holdoff to obtain a stable trigger for repetitive, composite waveforms. For example, if the number
or duration of sub-signals is known, you can disable them by setting an appropriate Holdoff value.
Note: Qualified
differently.
Hold Off by Time
This is a period of time to wait after the arming event before triggering on the next event. The
maximum allowed time is 20 seconds; the Holdoff time would otherwise be limited only by the input
signal, the coupling, and the instrument's bandwidth.
When a Holdoff by time is counted from the start of the acquisition, the oscilloscope readies, arms on
the first event, holds for the specified time, then triggers on the next event. After one full acquisition
has completed, the oscilloscope again readies, arms, holds, and triggers for the following acquisition.
Positive Edge trigger with Holdoff by time counted from the start of acquisition.
When a Holdoff by time is counted from the last trigger time, the oscilloscope immediately re-arms
on the first event following the trigger and begins counting the Holdoff, rather than wait to complete
the full acquisition. The Holdoff count continues even during the very brief time between acquisitions
while the oscilloscope is processing. As soon as the Holdoff is satisfied and the oscilloscope is
again ready, it triggers on the next event. The re-arming and Holdoff may occur in one acquisition, and
the trigger in the next.
Positive Edge trigger with Holdoff by time counted from the last trigger time.
operates using time or event conditions similar to Holdoff, but arm and trigger
Acquisition
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