| 摘要 |
<p>An electronic weigher includes a load cell for producing as an output an electric signal proportional to a load, an operational amplifier (2) for amplifying the electric signal produced by the load cell, an A/D converter (4) for converting an output signal produced by the operational amplifier into a digital signal, a bias circuit (D) for delivering a dummy signal for test purposes to the operational amplifier, and a switch (Sw) disposed between the bias circuit and the operational amplifier for applying the dummy signal to the operational amplifier, wherein amplification circuitry from the operational amplifier to the A/D converter is diagnosed by operating the switch.</p> |
