Accurate weight measurement using digital to analog converter me

Details Accurate weight measurement using digital to analog converter me Accurate weight measurement using digital to analog converter me

1981-04-07

1982-12-14

Miller, Jr., George H.

Weighing scales

Self-positioning

Electrical current generating or modifying

177DIG3, G01G 314

Patent

active

043633706

ABSTRACT:
Electronic scale apparatus includes a face transducer having a first analog output; digital to analog converter circuitry having a second output; a first differential amplifier to receive such outputs and to produce a third output; and a second differential amplifier to receive the third output and output of the converter circuitry to produce another output. A major portion of the weight of the object being weighed is determined at the output of the first differential amplifier (i.e. a coarse measurement). The remaining portion or difference is then amplified and balanced out at the second differential amplifier, enabling accurate determination of weight and driving of the digital to analog converter in feed-back mode.

REFERENCES:
patent: 3063635 (1962-11-01), Gordon
patent: 3464508 (1969-09-01), Engle et al.
patent: 3708027 (1973-01-01), Hill
patent: 3890833 (1976-06-01), Peer
patent: 4024053 (1977-05-01), Drew, Jr. et al.
patent: 4155411 (1979-05-01), Weaver

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