High-precision variable frequency power supply + FFT analysis: The instrument internally generates a highly stable sine wave signal (frequency typically adjustable between 45Hz-65Hz, or fixed at 50Hz/60Hz), applied to the device under test. Through high-precision A/D sampling and using the Fast Fourier Transform (FFT) algorithm, it filters out on-site power frequency interference and harmonics, accurately extracting the voltage and current amplitudes and phase difference at the fundamental frequency. Vector calculation method: Based on the measured voltage (U), current (I), and phase difference (φ), directly calculate: Impedance



High-precision variable frequency power supply + FFT analysis: The instrument internally generates a highly stable sine wave signal (frequency typically adjustable between 45Hz-65Hz, or fixed at 50Hz/60Hz), applied to the device under test. Through high-precision A/D sampling and using the Fast Fourier Transform (FFT) algorithm, it filters out on-site power frequency interference and harmonics, accurately extracting the voltage and current amplitudes and phase difference at the fundamental frequency. Vector calculation method: Based on the measured voltage (U), current (I), and phase difference (φ), directly calculate: Impedance