Weighing devices using electronic circuitry

Details Weighing devices using electronic circuitry Weighing devices using electronic circuitry

1980-09-11

1982-09-21

Miller, Jr., George H.

Weighing scales

Preset

177211, 177DIG3, G01G 2314, G01G 314

Patent

active

043502164

ABSTRACT:
A bathroom scale which uses an electronic circuit for providing a digital output voltage in response to the placing of a weight thereon, the electronic circuit having operational amplifier circuits which use both a positive power supply and a negative power supply, the latter assuring that the op-amps always return to a stabilized ground reference point to assure repeatability of weight measurement. The unit includes means for permitting the digital output voltage to reach a steady state value during a selected time period after a weight is placed on the scale and for preventing such steady state value from changing after such selected time period. The gain of the op-amp circuitry is adjustable to permit scale calibration to be performed.

REFERENCES:
patent: 3797595 (1974-03-01), Yin et al.
patent: 4044846 (1977-08-01), Matilainen
patent: 4137979 (1979-02-01), Itani
patent: 4155411 (1979-05-01), Weaver
patent: 4294322 (1981-10-01), Nishiyama

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