Weighing scales – Processes
Patent
1985-06-12
1986-12-09
Miller, Jr., George H.
Weighing scales
Processes
177212, 7386261, G01G 700, G01L 108
Patent
active
046275053
ABSTRACT:
Weighing apparatus of the load compensation type including a position sensing circuit for supplying current pulses from a constant current source to a compensation coil to return the load platform--after the application of a load thereto--toward its initial no-load position relative to the frame, the magnitude of the compensation current, as displayed by digital readout means, being a function of the mass of the applied load, characterized by the provision of an auxiliary analog-to-digital converter for digitalizing a signal corresponding with the compensation current, and a comparison circuit for comparing the digitalized signal with a standard value and for generating an error signal if the comparison result exceeds a given value. In addition to monitoring the constant current source, other components (such as temperature sensor, current switch and compensation coil) may be monitored by corresponding comparisons.
REFERENCES:
patent: 3786883 (1974-01-01), Kunz
patent: 3786884 (1974-01-01), Allenspach
patent: 4170269 (1979-10-01), Kunz
patent: 4189017 (1980-02-01), Strobel et al.
patent: 4245711 (1981-01-01), Kunz
patent: 4248316 (1981-02-01), Strobel et al.
patent: 4457386 (1984-07-01), Schett et al.
patent: 4549623 (1985-10-01), Baumann
Mettler Instrumente AG
Miller Jr. George H.
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