Apparatus for measuring the frequency of a pulse-generator and n

Details Apparatus for measuring the frequency of a pulse-generator and n Apparatus for measuring the frequency of a pulse-generator and n

1979-02-07

1981-03-24

Smith, Jr., David

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318314, 318341, H02P 516

Patent

active

042583004

ABSTRACT:
The frequency of a pulse generator, which could be the tachometer of a motor, is measured with a fast clock and a slow clock using a computer to calculate the frequency .omega.=k N1/N2, where N2 is a count of pulses accumulated in a register during each period of the slow clock while N1 is the count of the fast clock during the same period. Depending upon whether the measured frequency is higher or lower than the slow clock frequency, a comparator causes measurement to occur at the end of N2 pulses or with N2=1.

REFERENCES:
patent: 3518540 (1970-06-01), Roberts
patent: 3609326 (1971-09-01), Bagley
patent: 3757167 (1973-09-01), Yoshikawa
patent: 3859512 (1975-01-01), Ritzinger
patent: 3987365 (1976-10-01), Okada et al.
patent: 4093850 (1978-06-01), Karnowski et al.
Bederman, S. "Computer and Apparatus for Measuring Rotational Speed", IBM Tech. Disc. Bull., vol. 13, No. 4, pp. 1017-1018.

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