| 摘要 |
PURPOSE:To provide an electronic watthour meter with a built-in balance adjusting means which dispenses with manual intervention for eliminating a difference between elements of electric power conversion by a voltage transformer and current transformer for conducting conversion into a low voltage signal suitable for electronic current processing, in a multiple element electronic watthour meter wherein a voltage and current are A/D converted and multiplied to be converted into electric power. CONSTITUTION:A multiplication form balance coefficient alpha is determined according to an average power value difference per cycle of an AC circuit frequency in an arithmetic means 17 so as to store a difference between a power value of a reference element and that of another element in a storage memory 19, and at the time of power measurement the balance coefficient alpha is subjected to difference elimination computation with output of another element multiplier 16 by means of an arithmetic circuit 20. |
