| 摘要 |
<p>A load cell type weight-measuring device includes a load cell (2); a test voltage generator (22) for generating a voltage equal to a rated output voltage of the load cell (2); a zero-point setting circuit (24); an amplifying circuit (4); a switching circuit (S1 to S3) for selectively coupling the load cell (2) and test voltage generator (22) to the amplifying circuit (4); and a data processing circuit (6,10) for generating weight data corresponding to an output signal from the amplifying circuit (4). The amplifying circuit includes a first amplifier (4-2) of a gain 1 for amplifying an output voltage from the zero-point setting circuit (24); first and second resistors (R2 and R1); and a second amplifier (4-1) whose first input terminal is connected to an output terminal of the first amplifier (4-2) through the first resistor (R2) and is connected to its own output terminal through the second resistor (R1) and whose second input terminal is connected to the switching circuit (S1 to S3).</p> |
