Analysis of the method for EMC radiation safety margin test

The differences between the direct test method and the indirect test method are found based on the definition of the radiation safety margin in this paper. The mechanisms of the external radiation interference on the system are discussed. A new test method considering the earth line common mode interference and secondary radiation effect is presented. The new test method has high efficiency and low cost. The test results of the new test method are in agreement with the ones of the direct test method.