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.Readings exhibit the productive voltage based upon the normal worth of samples more than a complete amount of intervals of the fundamental frequencyHarmonics are periodic distortions of voltage, presen