| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a multi-circuit watt-hour meter further improved in measurement precision. <P>SOLUTION: The multi-circuit watt-hour meter 1 for measuring electric energy in a plurality of measuring points of an AC circuit 100 that is a measuring object comprises an input circuit switching part 20 having a common voltage input port for inputting the voltage of the AC circuit 110 as a common voltage in the measuring points and a plurality of current input ports for inputting the currents of the measuring points, respectively, which repeats, as one unit, a switching processing for alternately switching and outputting the input of the common voltage input port and the input of the plurality of current input ports while successively switching each input of the current input ports at a time interval of a half or less of the AC period carried to the AC circuit 100; a power measurement part 30 for computing the power based on the common voltage and the currents of the measuring points outputted from the input circuit switching part 20; and a circuit-based electric energy computing part 40 for computing the electric energy for each of the measuring points based on the output of the power measurement part 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
