Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1993-04-29
1994-11-29
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
177229, 73862628, G01G 314, G01G 308, G01L 122
Patent
active
053692268
ABSTRACT:
Load shift compensation of a strain gage load cell is accomplished by connecting a pair of fixed resistors in series across the output of a bridge circuit incorporating the load cell strain gages. The junction point between the series resistors is established at a desired signal level by a digital to analog converter connected thereto or by a voltage divider network so that, in effect, a part of the resistance of the resistors required to achieve load shift compensation is made to shunt a pair of the strain gages in the bridge circuit. The required signal level may be established by positioning weights on the scale platter at different positions parallel to the longitudinal axis of the load cell beam and adjusting the signal level at the junction point between the shunting resistors until a desired degree of compensation is achieved. The digital correction value required at the input of the digital to analog converter to achieve compensation is stored in the memory of the scale computer.
REFERENCES:
patent: 3234787 (1966-02-01), Ruge
patent: 3576128 (1971-04-01), Lockery
patent: 4380175 (1983-04-01), Griffen
patent: 4574899 (1986-03-01), Griffen
patent: 4657097 (1987-04-01), Griffen
patent: 4979580 (1990-12-01), Lockery
patent: 5184520 (1993-02-01), Naito
Griffen Neil C.
Loshbough Richard C.
Mettler-Toledo, Inc.
Miller Jr. George H.
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