Tests on harmonics and flicker ensure that the products meet the international standard on electrical disturbances such as IEC 61000-3-2, IEC 61000-3-3, IEC 61000-3-2, IEC 61000-4-15, IEC 61000-4-7, IEC 61000-3-12, IEC 61000-4-13 The instruments AC2000A and AC 1000A measure and analyze the seven essential harmonics and Flicker of the mains supply to ensure minimal interference and compliance with IEC standards.