User manual

WaveSurfer 3000/3000z Oscilloscopes 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

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 triggers operate using time or event conditions similar to Holdoff, but arm and

trigger 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.