Load cell type weight measuring device and a sensitivity checkin

Details Load cell type weight measuring device and a sensitivity checkin Load cell type weight measuring device and a sensitivity checkin

1984-06-01

1986-04-08

Miller, Jr., George H.

Weighing scales

With testing

177210R, 73 1B, G01G 1952, G01G 314, G01L 2500

Patent

active

045806446

ABSTRACT:
A load cell type weight measuring device includes a load cell which produces an output voltage corresponding to the weight applied thereto, an amplifier circuit for amplifying the output voltage of the load cell, and an A/D converter for converting an output voltage of the amplifier circuit to digital data. This weight measuring device further includes a rated voltage generating circuit for generating an output voltage equal to the output voltage generated from the load cell which is applied with a rated weight; switches for selectively connecting the load cell, the rated voltage generating circuit and the ground terminal to the amplifier circuit; and a microcomputer which gives control signals to the switches and inhibits the output data of the A/D converter from being supplied as effective weight measurement data when it is detected that the difference between two items of output digital data of the A/D converter, which are respectively obtained when the ground terminal and the rated voltage generating circuit are selected, exceeds a predetermined range.

REFERENCES:
patent: 3728626 (1973-04-01), Douglas et al.
patent: 4158396 (1979-06-01), Suzuki et al.
patent: 4294322 (1981-10-01), Nishiyama
patent: 4375838 (1983-03-01), Yano et al.
patent: 4535854 (1985-08-01), Gard et al.

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