The relationship between test conditions for power frequency magnetic fields of external origin and the measurement additional error of energy meter was introduced. PresentsSdoing power frequency magnetic fieldsStest at the lower bound of energy meter current range. Simulation indicates, if meter meet the test requirements of 0.5mT power frequency magnetic field at the load point suggested in article, it can ensure the induced current is less than the starting current. To the test method of no load testSin the power frequency magnetic field, proposed itsSdeficiency.SStatistical measuring additionalSerrors of different types of energy meter using copper-manganese shunt in the pastS5 years,Sfinding theSantiSpower frequencySmagnetic fieldScapacity of energy meter increased year by year, a breakthrough improvement (<0.2%) in 2014.