Weighing scales – Self-positioning – Electrical current generating or modifying
Patent
1981-12-28
1983-11-29
Miller, Jr., George H.
Weighing scales
Self-positioning
Electrical current generating or modifying
177 1, 177165, 177DIG3, G01G 314, G01G 1314
Patent
active
044176317
ABSTRACT:
A zero tracking circuit (32) monitors the output of an electronic scale employing a dual slope integrating type analog-to-digital converter (20) to detect low magnitude output signal levels characteristic of drift and other low level noise. The converter (20) samples the magnitude of an input analog signal proportional to applied weight and in response controls a count accumulated in a resettable up/down counter (36). The counter (36) is manually reset to provide tare, that is, to provide a zero reading with an applied weight. The output of the counter (36) is supplied to a digital display (40a-40d) that displays changes in applied weight. The zero tracking circuit (32) includes a decoder (56) that monitors the output of the counter (36) and in response to low magnitude counts characteristic of drift, e.g., one count on each side of zero, resets the counter (36) to eliminate the drift.
REFERENCES:
patent: 3662845 (1972-05-01), Pratt
patent: 3709309 (1973-01-01), Williams, Jr. et al.
patent: 3812923 (1974-05-01), Rock
patent: 3979055 (1976-09-01), Fathauer et al.
patent: 4139892 (1979-02-01), Gudea et al.
patent: 4294320 (1981-10-01), Bilstad et al.
Miller Jr. George H.
Sensor Developments, Inc.
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