| 摘要 |
PROBLEM TO BE SOLVED: To provide a magnetic field compensating system of which alternating frequency is very low and of which frequency is actually suitable to a magnetic field of almost 0 Hz. SOLUTION: A magnetic field measuring device comprises a first sensor and a second sensor. The first sensor is active to a magnetic field within a first frequency range, the frequency range including frequencies lower than a frequency range to which the second sensor is active. COPYRIGHT: (C)2008,JPO&INPIT
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