Digital data acquisition apparatus

Details Digital data acquisition apparatus Digital data acquisition apparatus

1984-01-03

1985-11-12

LaRoche, Eugene R.

Oscillators

Automatic frequency stabilization using a phase or frequency...

With reference oscillator or source

331 16, 307518, 307352, H03L 700

Patent

active

045531099

ABSTRACT:
Digital data acquisition apparatus for periodically sampling a waveform. Periodic data acquisition signals are provided at predetermined intervals with the waveform being sampled at the predetermined intervals in response to the data acquisition signals. The apparatus has at least a first operation mode wherein waveform sampling is initiated on the occurrence of a trigger event. In this operation mode, the apparatus includes an improvement for increasing its effective sample rate by providing a first data acquisition signal, following a trigger event, at an interval after the trigger event that is shorter than the interval between subsequent data acquisition signals. A second mode of operation may also be provided wherein sampling is manually initiated. In either operation mode, a phase locked loop may be employed to regulate, or tune, the interval between data acquisition signals.

REFERENCES:
patent: 4136396 (1979-01-01), Hansford
patent: 4223180 (1980-09-01), Eckels
patent: 4366399 (1982-12-01), Furuhata

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