Readings display the efficient voltage based on the normal value of samples about an entire amount of periods of the elemental frequency trong m?t kho?n th?i gian nh?t ??nh tr??c khi ?i?u ch?nh, t?t nh?t b?n nên dùng ph??ng pháp t? ??ng ho?c xây d?ng hàm ?? ki?m tra v?i d? li?u.Harmonics are periodic distortions of voltage, latest, or electri