| 摘要 |
A load cell type weight measuring device includes a load cell which produces an output voltage corresponding to the weight applied thereto, an amplifier circuit for amplifying the output voltage of the load cell, and an A/D converter for converting an output voltage of the amplifier circuit to digital data. This weight measuring device further includes a rated voltage generating circuit for generating an output voltage equal to the output voltage generated from the load cell which is applied with a rated weight; switches for selectively connecting the load cell, the rated voltage generating circuit and the ground terminal to the amplifier circuit; and a microcomputer which gives control signals to the switches and inhibits the output data of the A/D converter from being supplied as effective weight measurement data when it is detected that the difference between two items of output digital data of the A/D converter, which are respectively obtained when the ground terminal and the rated voltage generating circuit are selected, exceeds a predetermined range. |
