Measurement apparatus and measurement method

A measurement apparatus configured to be able to measure a resistance component leakage current, the measurement apparatus comprising:

• a magnetic core capable of being disposed so as to surround a wire;
• first and second coils wound around the magnetic core;
• a current measurement circuit connected to the first coil, the current measurement circuit configured to be able to measure a leakage current of the wire;
• a voltage measurement circuit configured to be able to measure a voltage of the wire;
• a phase angle detection circuit configured to be able to detect a phase angle between the leakage current and the voltage;
• a signal generator configured to be able to output sinusoidal waves to the second coil and the phase angle detection circuit;
• and
• a controller,
• wherein
• the phase angle detection circuit is configured to be able to detect a calibration phase angle between a current measured by the current measurement circuit when the signal generator is outputting the sinusoidal waves, and one of the sinusoidal waves input from the signal generator, and
• the controller is configured to:
• calculate a corrected phase angle based on the phase angle and the calibration phase angle;
• and
• calculate the resistance component leakage current based on the leakage current and the corrected phase angle.