| 摘要 |
PROBLEM TO BE SOLVED: To provide a frequency measuring device capable of measuring a frequency of a current flowing in a conductor to be measured, and a current measuring device and a current measuring method capable of calculating accurately the current flowing in the conductor by correcting an influence of an eddy current even when the frequency of the current flowing in the conductor to be measured is high. SOLUTION: The frequencyωof the current I is operated based on an output signal X of a magnetometric sensor 31 for detecting a magnetic field 2 generated by the current I flowing in the conductor to be measured (bus bar 1), and on a second-order differentiated value X" of the output signal X. Then, an error component of an amplitude and a phase of the current I is corrected based on the calculated frequencyω, and the value of the current I flowing in the conductor to be measured is output. COPYRIGHT: (C)2010,JPO&INPIT
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