Controlled gate circuit

Details Controlled gate circuit Controlled gate circuit

1981-04-02

1983-06-21

Miller, Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307259, 307359, 307546, 328127, 328161, H03K 1774, H03K 500

Patent

active

043895786

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 by a controlled gate circuit which adjustably clips the tuned circuit drive, 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: 3249766 (1966-05-01), Bourget
patent: 3591851 (1971-07-01), Drushel
patent: 3694668 (1972-09-01), Foerster
patent: 3710142 (1973-01-01), Yokoyama
patent: 3857048 (1974-12-01), de Meux et al.
patent: 3898573 (1975-08-01), Sherman

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