| 摘要 |
PROBLEM TO BE SOLVED: To provide a harmonic analyzer for performing harmonic analysis on more signals by a harmonic analyzer having a particularly small number of input circuits, as to an analyzer for harmonics arising in an AC circuit such as a three-phase AC circuit, etc. SOLUTION: Detection terminals are provided for an AC current including harmonic components. Current waveform signals detected by the detection terminals are severally normalized by input circuits as many as the detection terminals, and converted into digital signals. Then, a current waveform signal detected by a computing unit is used to generate another current waveform signal, fast Fourier transformation is performed thereon and then displayed on an indicator for example, for harmonic analysis. This configuration makes it possible to perform harmonic analysis on current waveforms more than the detection terminals (the input circuits). COPYRIGHT: (C)2005,JPO&NCIPI
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