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the power frequency magnetic field is generated by the power frequency current in the conductor, or a very small amount of it is generated by other accessories (such as the leakage flux of the transformer). power frequency magnetic field may affect the reliable operation of equipment and system. the power frequency magnetic field generator is used to evaluate the performance of household, commercial and industrial electrical and electronic equipment in power frequency (continuous and short-time) magnetic field. the products meet the requirements of new standards such as iec61000-4-8 and gb/t17626.8.