Electronic balance and its application to a thermal analyzer

Details Electronic balance and its application to a thermal analyzer Electronic balance and its application to a thermal analyzer

1993-03-12

1996-02-20

Wong, Peter S.

Weighing scales

Self-positioning

Repositioning in response to deflection under load

177210EM, 374 14, G01G 314, G01G 138

Patent

active

054930782

ABSTRACT:
An electronic balance provided with a correcting circuit for canceling a thermal drift in the output of a photoreceiver. The photoreceiver is composed of two photosensitive areas and the shadow of a shutter moving with the beam of the balance is cast on the two photosensitive areas. The outputs of the two photosensitive areas are sent to a first subtracting circuit and an adding circuit. The output of the first subtracting circuit is corrected by the output of the adding circuit to produce signal independent of temperature change and corresponding only to the turn of the beam of the electronic balance.

REFERENCES:
patent: 4625819 (1986-12-01), O'Neill
patent: 4982081 (1991-01-01), Schmidt
patent: 5193910 (1993-03-01), Kinoshita
patent: 5266792 (1993-11-01), Crowne et al.
IBM Technical Disclosure Bulletin, vol. 30, No. 7, Dec. 1987, New York, U.S., pp. 432-434, "Servo-Controlled High-Accuracy and Low-Cost Electronic Scale".

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