Digital scale

Details Digital scale Digital scale

1979-01-15

1980-11-25

Wise, Edward J.

Boots, shoes, and leggings

364466, 177 1, 177 25, G01G 2314, G01G 1314

Patent

active

042362229

ABSTRACT:
The invention relates to a scale system which employs a microcomputer forming an integral part of the analog to digital conversion means in which the microcomputer controls the sequence of operations for performing the conversion, accumulates and stores digital data derived during the conversion of the analog signal and combines and processes that data to provide the digital output data resulting from the conversion, all in addition to performing other scale functions. The invention relates to an improved multicapacity weighing and computing digital scale having a triple slope analog-to-digital conversion means. The analog weight signal is integrated for a time interval which is fixed for a given scale capacity range which would generate substantially the same integrator output level in response to a full capacity weight signal for the selected scale capacity as would be generated by a full capacity weight for all other scale capacities. In accordance with the invention, the time interval during which the first reference DC source is integrated is extended beyond the detection of the crossover of the integrator output with its reference level. The invention also provides an improved weight filtering arrangement which enables the full advantage of the improved converter to be obtained. The invention further provides for the tracking of the net zero indication by modification of the stored tare weight data by a predetermined amount to decrease the absolute value of the net weight in response to the net weight being within a preselected weight range.

REFERENCES:
patent: 3853267 (1974-12-01), Cadwell et al.
patent: 4036316 (1977-07-01), Rock
patent: 4055748 (1977-10-01), Boshinski et al.
patent: 4071102 (1978-01-01), Ostenbridge et al.
patent: 4114706 (1978-09-01), Realini et al.

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