| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a watt-hour meter constituted of a comparatively simple circuit, capable of measuring highly-accurate power consumption. <P>SOLUTION: A signal on a differential value of a using current outputted from a current detection part 104 comprising a coil of air-core bonding or the like, and a signal acquired by differentiating by a differentiation circuit 108, a signal on a using voltage detected by a voltage detection part 105, are multiplied together by a multiplication part 109, and a signal acquired by multiplication by the multiplication part 109, and a signal on a frequency detected by a frequency detection part 111 are operated, to thereby calculate the power. <P>COPYRIGHT: (C)2010,JPO&INPIT |
