Weighing scales – Computer – Electrical
Patent
1977-01-21
1979-03-13
Hartary, Joseph W.
Weighing scales
Computer
Electrical
177DIG3, 340347AD, 364567, 364745, G01G 19413
Patent
active
041437241
ABSTRACT:
An electronic weighing apparatus, is provided with a load cell which is responsive to the weight of an article being weighed. A preamplifier amplifies the analog output signal from the load cell which is representative of the weight of the article, by a predetermined amplification factor. An analog-to-digital converter converts the amplified weight representing analog output signal into a digital signal representative of the weight. The analog-to-digital converter has an enhanced resolution which may be as high as five times the resolution of a conventional A/D converter. An adder adds a first predetermined digital signal representative of the decimal value "2" to the weight representing digital signal. A divider divides the sum output from the adder by a second predetermined digital signal representative of the decimal value "5". A display device displays the quotient output from the divider, whereby the weight representing digital signal from the analog-to-digital converter is first shifted by the digital value "2", whereupon the shifted digital signal is divided by the digital value "5", with the result that an ultimate digital display output is obtained, wherein the zero point of the analog signal is positioned substantially in the center of the analog input range for the digital value "0" in the characteristic curve of the analog input versus digital output transfer function, whereby a differential non-linearity error is minimized.
REFERENCES:
patent: 3653015 (1972-03-01), Rock
patent: 3879724 (1975-04-01), McDonald
patent: 3891837 (1975-06-01), Sunstein
patent: 4049068 (1977-09-01), Kavanagh
Fasse W. G.
Hartary Joseph W.
Kubota Ltd.
Roberts W. W.
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