Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1981-12-07
1983-12-06
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 59, 324 60R, 324 61QS, G01R 2700
Patent
active
044196237
ABSTRACT:
A circuit capable of measuring the value of an unknown reactance over a wide range of values resonates the unknown reactance with a known reactance value of opposite type by means of an operational amplifier. An adjustable feedback resistance connected between the output and input of the operational amplifier triggers the oscillation. The value of the unknown reactance is then readily computed from the resonant frequency and the known reactance value. In a further calculation the Q of the circuit can be determined from the feedback resistance value.
REFERENCES:
patent: 2602838 (1952-07-01), Boisblanc et al.
patent: 3225298 (1965-12-01), Cochran
patent: 3612993 (1971-10-01), Tims et al.
patent: 3840805 (1974-10-01), Martyashin et al.
patent: 3970925 (1976-07-01), Procter et al.
Bell Telephone Laboratories Incorporated
Kearns J. P.
Krawczewicz Stanley T.
Newman H. L.
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