Multi-channel trigger dejitter

Details Multi-channel trigger dejitter Multi-channel trigger dejitter

1992-01-31

1994-10-04

Nguyen, Vinh

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Cathode ray

3241581, 364487, G01R 2500

Patent

active

053529766

ABSTRACT:
A multi-channel trigger dejitter technique uses actual digitized samples from a repetitive waveform signal to correct for jitter in a hardware trigger signal. Interpolated samples are calculated between a set of the digitized samples about the hardware trigger signal, and a hardware trigger level is determined from the closest sample in time to the hardware trigger signal. The hardware trigger level is averaged with that determined from prior acquisitions to produce an average trigger level. The closest sample in time to the average trigger level becomes an averaged trigger signal, and the times for all the digitized samples for that acquisition, as well as all simultaneous acquisitions from other input channels, are adjusted according the difference in time between the hardware and averaged trigger signals. Over several acquisition iterations of the repetitive waveform the amount of jitter between acquisitions is decreased.

REFERENCES:
patent: 4555765 (1985-11-01), Crooke et al.
patent: 4779045 (1988-10-01), Shark
patent: 4797936 (1989-01-01), Nakatsugawa et al.
patent: 4843309 (1989-06-01), Kareem et al.

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