Electronic weigher with compensated test signal

Details Electronic weigher with compensated test signal Electronic weigher with compensated test signal

1986-04-03

1988-02-02

Goldberg, E. A.

Weighing scales

With testing

177211, 73 1B, 7386267, G01G 1952, G01G 314

Patent

active

047224061

ABSTRACT:
An electronic weigher includes a load cell for producing as an output an electric signal proportional to a load, an operational amplifier for amplifying the electric signal produced by the load cell, A/D converter for converting an output signal produced by the operational amplifier into a digital signal, a bias circuit for delivering a dummy signal for test purposes to the operational amplifier, and a switch disposed between the bias circuit and the proportional amplifier for applying the dumy signal to the operational amplifier, wherein amplification circuitry from the operational amplifier to the A/D converter is diagnosed by operating the switch.

REFERENCES:
patent: 4475608 (1984-10-01), Naito
patent: 4535854 (1985-08-01), Gard et al.

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