| 摘要 |
PURPOSE:To improve the reliability against a temperature by providing a series circuit of a fixed resistance and a variable resistance type sensor, in parallel to three coil means which are connected in series to each other, and among which two magnetic field generating directions cross each other, and also providing a non-linear circuit between both of them. CONSTITUTION:Among coils 1-3, the coil 1 and 2 are wound so that directions of a generated magnetic field cross each other, and the coils 1-3, a fixed resistance 4, a variable resistance type sensor 5 and a Zener diode 6 constitute a bridge circuit. When the potential of a point B is lower than the potential of a point A by a variation of a resistance value of the sensor 5, I1>I4. When the potential of the point B is higher than the potential of the point A, and the potential difference is smaller than the reverse direction breakdown voltage of the diode 6, I1=I4, and when said potential differential is larger, I1<I4. Accordingly, a needle fixed to a movable magnet of a two-pole magnetization is operated by an indicating degree characteristic by which a deflection angle has a point of inflection against a resistance value of the sensor 5. In such a way, the reliability against a temperature of an indicating meter can be improved.
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