G - Physics
01
G
354/38, 265/5, 3
G01G 19/413 (2006.01) G01G 19/414 (2006.01) G01G 23/37 (2006.01) H03M 1/00 (2006.01)
Patent
CA 1113514
ABSTRACT OF THE DISCLOSURE 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.
308202
Loshbough Richard C.
Pryor Edward G.
Macrae & Co.
Reliance Electric Company
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