Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-07-06
1977-08-02
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 61QS, 324130, G01R 2726
Patent
active
040399397
ABSTRACT:
A moisture measuring apparatus includes a tuned circuit, a moisture sensor, coaxial cable means between the sensor and the tuned circuit wherein the tuned circuit tunes the coaxial cable, and a circuit for ascertaining the loading presented by the sensor to the tuned circuit whereby moisture is measured. The sensor is alternately connected and disconnected to an end of the coaxial cable and the signal drive across the tuned circuit is standardized, when the sensor is disconnected, for zeroing the instrument. Also, the gain of the circuitry is adjusted by periodically providing a standard load to the tuned circuit while adjusting amplification to bring about a standard output. The apparatus is not as sensitive to cable changes as prior apparatus and a plurality of selectable coaxial cables are provided on reels adjacent the sensor console.
REFERENCES:
patent: 2617856 (1952-11-01), Erwin
patent: 2621229 (1952-12-01), Mercier
patent: 3426271 (1969-02-01), Alais
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