Measurement apparatus and measurement method

Abstract

A phase angle is measured accurately when a resistance component leakage current is measured. A measurement apparatusaccording to the present disclosure includes a magnetic core, first and second coils L1 and L2 wound around the magnetic core, a current measurement circuit, a voltage measurement circuit, a phase angle detection circuit, a signal generatorthat can output sinusoidal waves to the second coiland the phase angle detection circuit, and a controller. The phase angle detection circuitcan detect a calibration phase angle between a current measured by the current measurement circuitwhen the signal generatoris outputting the sinusoidal waves, and one of the sinusoidal waves input from the signal generator. The controllercalculates a corrected phase angle based on a phase angle and the calibration phase angle, and calculates a resistance component leakage current based on a leakage current and the corrected phase angle.