Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Phase comparison
Patent
1974-05-06
1976-09-21
Rolinec, R. V.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Phase comparison
307269, 324 79D, G01R 2500
Patent
active
039821846
ABSTRACT:
A phase difference detector and display unit. A digital pulse train at the frequency to be measured is combined with a multiple-phase digital clock output having a reference frequency to produce multiple-phase signals which low-pass filters convert to dc output signals. Each output signal indicates the instantaneous phase difference between the digital pulse train and a respective one of the clocking signals.
Each dc output signal controls the light from a pair of lamps. Individual lamps in each pair are diametrically opposed on a circle with all the pairs being spaced around the circumference of the circle. The lamp pairs reach maximum brightness in sequence, providing the illusion of a rotating light bar. The direction of rotation indicates whether the digital pulse train is higher or lower in frequency than the reference while the speed of rotation is proportional to the frequency deviation from the reference.
REFERENCES:
patent: 3303421 (1967-02-01), Kelling
patent: 3304504 (1967-02-01), Horlander
patent: 3461392 (1969-08-01), Hughes
patent: 3577178 (1971-05-01), Hawley
patent: 3696293 (1972-10-01), Hoffmann
patent: 3745544 (1973-07-01), Ono
patent: 3820022 (1974-06-01), Watt
Inventronics, Inc.
Rolinec R. V.
Tokar Michael J.
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