| 摘要 |
PURPOSE:To improve the accuracy over wide range from a light article to a heavy article, by a method wherein an A/D converter performs A/D conversion based upon the reference voltage which is switched in proportion to the input electric power, and applies the output to an indicator. CONSTITUTION:A voltage dividing resistor 31 and a switching circuit 32 are provided for switching the reference voltage of an A/D converter 3 by stages. Further, an operation circuit 5 is provided for multiplying the output of the A/D converter 3 by the ratio of the reference voltage decreased. |
