| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a wattmeter capable of reducing the vanishing risk of data even if an improper high voltage is applied in such a case as lightning, surge or the like. <P>SOLUTION: A used current and a used voltage are converted into data by encoding parts 107, 108, 109, 110, the data are radio-transmitted thereafter by transmission parts 112, 113, 114, 115, the radio-transmitted data are received by reception parts 117, 118, 119, 120, and used electric power is computed thereafter by an electric power computing part 121 so as to calculate electric energy data. <P>COPYRIGHT: (C)2009,JPO&INPIT |
