Electronic weighing instrument of the electrostatic capacity typ

Details Electronic weighing instrument of the electrostatic capacity typ Electronic weighing instrument of the electrostatic capacity typ

1988-12-22

1989-08-15

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

177210FP, G01G 314

Patent

active

048566039

ABSTRACT:
The invention provides an electronic weighing instrument of the electrostatic capacity type which eliminates an influence on a measured weight value of a rate of change in oscillation frequency which is caused by environmental conditions such as an ambient temperature or a humidity. The electronic instrument comprises a pair of capacitors having capacitances which are differentially varied by a displacement caused by a load. The capacitors are alternately connected to the oscillating circuit at predetermined intervals of time, and each time either of the capacitors is connected to the oscillating circuit, an oscillation frequency is fetched from the oscillating circuit. Then, a difference and a sum between two different oscillation frequencies successively fetched from the oscillating circuit are calculated, and the difference is divided by the sum to obtain a measured weight value.

REFERENCES:
patent: 3595329 (1971-07-01), Withnell et al.
patent: 3604525 (1971-09-01), Blethen et al.
patent: 3979581 (1976-09-01), Reuland
patent: 4237989 (1980-12-01), Lewis
patent: 4294321 (1981-10-01), Wittlinger et al.
patent: 4366875 (1983-01-01), Dauge et al.
patent: 4463614 (1984-08-01), Lee

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