当前电子产品在正式出售时必须要通过当地的对电磁辐射限制的要求和标准,即EMC标准,大量的公司和单位因为EMC测试无法通过而耽误了产品上市,从而失去了市场,造成无法挽回的损失。文章讲述了EMI测试和如何在实际设计过程中控制EMI以及在测试无法通过时如何进行整改以使测试通过,给出了大量设计实战经验和调试经验 The current sale of electronic products must be through the local requirements and standards for electromagnetic radiation restrictions, the EMC standard, a large number of companies and units because of EMC testing failed to pass the listing of products, thus losing the market, resulting in irreparable loss. The article describes the EMI test and how to control EMI in the actual design process and how to make corrections in order to pass the test when the test fails, giving a lot of practical experience and debugging experience