Weighing apparatus and method for automatically monitoring a constant current source
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United States of America Patent
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Dec 9, 1986
Grant Date -
N/A
app pub date -
Jun 12, 1985
filing date -
Jun 29, 1984
priority date (Note) -
Expired
status (Latency Note)
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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.
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