Patent ID: 8547091

Claim:
A measuring method that measures a resistance of a resistor of a magnetic sensor that includes a magneto resistance effect (MR) element and the resistor connected in parallel with the MR element, the method comprising: a step of measuring an output voltage of the magnetic sensor in an alternating-current (AC) magnetic field, the output voltage being defined by a difference between a voltage of the magnetic sensor when the AC magnetic field is a maximal value and another voltage of the magnetic sensor when the AC magnetic field is a minimal value, a step of measuring a first combined resistance of the MR element and the resistor in no magnetic field, a step of measuring a second combined resistance of the MR element and the resistor in a constant magnetic field of which a direction and strength are substantially the same as a magnetic field in which the AC magnetic field is the maximal value, a step of measuring a third combined resistance of the MR element and the resistor in another constant magnetic field of which a direction and strength are substantially the same as another magnetic field in which the AC magnetic field is the minimal value, and a step of calculating the resistance of the resistor based on the output voltage, the first combined resistance, the second combined resistance, and the third combined resistance.