The power frequency magnetic field is generated by the power frequency current in a conductor, or a small amount is generated by other nearby devices (such as the leakage flux of a transformer). The characteristics of a power frequency magnetic field are low frequency, long wave length, and its test waveform is a power frequency sine wave, which can have varying degrees of impact on various electrical and electronic equipment. For example, devices such as kilowatt hour meters may experience program disturbances, memory data loss, and metering errors under the action of power frequency magnetic fields. Power frequency magnetic field immunity is used to evaluate the performance of household, commercial, and industrial electrical and electronic equipment exposed to power frequency (continuous and short-term) magnetic fields, especially suitable for evaluating the magnetic field immunity performance of magnetic field sensitive equipment such as computer monitors and watt-hour meters
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