Process timing apparatus

Details Process timing apparatus Process timing apparatus

1981-04-06

1983-07-19

Roskoski, Bernard

Horology: time measuring systems or devices

Time interval

Electrical or electromechanical

368 9, 368 1, G04F 800, G04F 1000

Patent

active

043940900

ABSTRACT:
An indicating electronic timer useful for timing processing events and for controlling a process measures the elapsed time from a moment at which a process variable attains a predetermined value and produces a signal which varies in accordance with the elapsed time. During a timing operation, the signal is displayed on a display device which normally displays the process variable, and may be such that the display device indicates the percentage of a predetermined time interval which has elapsed. The timer may be conveniently implemented with relatively inexpensive integrated circuits, such as a variable oscillator, binary counters, and D/A converters.

REFERENCES:
patent: 3543108 (1970-11-01), Collins et al.
patent: 3588699 (1971-06-01), Pysnik
patent: 4136329 (1979-01-01), Trobert
patent: 4140996 (1979-02-01), Leitch et al.
patent: 4317106 (1982-02-01), Huber
Electronic Design, vol. 25, pp. 108, 110, "Time Interval Meter Reads Digitally to 99.9 MS on a DVM 1c", 3/77.

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