| 摘要 |
PROBLEM TO BE SOLVED: To improve measurement accuracy by reducing occurrences of measurement errors during bus bar non-energization (at zero ampere) resulting from hysteresis of a magnetic material for magnetic shield.SOLUTION: There are provided first and second magnetic materials 30A and 30B for magnetic shied facing each other, and a bus bar 10 and a hole IC 20 disposed between the magnetic materials 30A and 30B, the facing magnetic materials 30A and 30B are magnetized in an opposite position from each other when current is caused to flow to the bus bar 10, and the hole IC 20 is disposed at a position at which a magnetic field applied to the hole IC 20 is weakened by a magnetic field generated by magnetizing the magnetic material 30A, and a magnetic field generated by magnetizing the magnetic material 30B. |
