| 摘要 |
PURPOSE:To prevent errorneous operation of an A/D converter from the side of output lines, by separating the load cell and the A/D converter circuit, which is connected to the outside through a photocoupler, by a separating plate, and housing them in a shield case. CONSTITUTION:The load cell 1 which is connected to a receiving pan frame, and a circuit, wherein the photocoupler 5 is connected to the A/D converter unit 2 comprising an amplifier circuit 3 and an A/D converter 4, are separated by the separating plate B and housed in the shield case A. The output of the photocoupler 5 is imparted to a data selector 7 through electromagnetic interference filters 22, and the signal is calculated. Thus the measurement is performed. Since the photocoupler 5 and the output side is not coupled by a conductor, the high frequency energy generated on the output side does not affect the A/D converter 2, and the erroneous operation due to said coupling can be prevented. |
