| 摘要 |
PROBLEM TO BE SOLVED: To enable setting of an appropriate magnetic force level according to a distance to a magnet by an easy operation at installation site. SOLUTION: A far and near selection part selects capturing output from a high-gain amplifier circuit 54-1, when a magnetic force level obtained from an output signal of the high-gain amplifier circuits 54-1 is not more than a predetermined far and near determination threshold, and selects capturing the output from a low gain amplifier circuit 54-2, when the magnetic force level is over the far and near determination threshold. A registration processing part performs initial registration to a nonvolatile memory, of the magnetic force level obtained from the output signal by the high-gain amplifier circuits 54-1 or by the low-gain amplifier circuit 54-2 selected in the far and near selection part and computes from the magnetic force level, a lock determination threshold which is lower by a different ratio corresponding to the far and near selection and registers it in the nonvolatile memory. COPYRIGHT: (C)2011,JPO&INPIT
|
