Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1987-03-13
1989-04-18
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
177 1, 338 2, 7386267, G01G 314, G01L 122
Patent
active
048218227
ABSTRACT:
A resistor-adjusting apparatus is provided for adjusting resistors of a load-cell scale which has a load cell, having a resistance bridge circuit, for generating an electrical signal corresponding to a load weight, and an A/D converting section for converting the electrical signal supplied from the load cell into a digital signal corresponding to the load weight. A thin-film resistor for adjusting temperature characteristic, which is connected to the bridge circuit, is provided on the load cell so as to be exposed. The resistor-adjusting apparatus comprises a resistor adjustor for removing part of the thin-film resistor in response to a control signal and thus adjusting a resistance thereof, and a control unit for supplying, to the resistor adjustor, a control signal corresponding to digital signals that are generated by the A/D converting section in response to a predetermined load weight at different temperatures, causing the resistor adjustor to change the resistance of the thin film resistor.
REFERENCES:
patent: 4294322 (1981-10-01), Nishiyama
patent: 4432247 (1984-02-01), Takeno et al.
patent: 4572309 (1986-02-01), Nishiyama
patent: 4580644 (1986-04-01), Nishiyama
patent: 4630491 (1986-12-01), Kitagawa et al.
patent: 4633721 (1987-01-01), Nishiyama
Kitagawa Tohru
Nishiyama Yoshihisa
Miller Jr. George H.
Tokyo Electric Co. Ltd.
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