半电波暗室3m法辐射骚扰测试的实验

摘要

This paper studies on radiated emission test in 3 meters Semi-Anechoic Chamber. This paper firstly demonstrated the inverse proportionality factor of 20 dB per decade is approximate theoretically. Then experimental analyze was proceeded, and comparison of radiated field strength between 3 meters and 10 meters inside the semi-anechoic chamber came to a conclusion that radiated field strength at 3 meters can’t be used to judge whether devices exceed limit value, and 3 meters Semi-Anechoic Chamber is suitable for EMC rectification.%首先对半电波暗室3m法辐射骚扰测试进行的理论分析表明，由于需要符合远场条件以及半电波暗室中存在金属反射地面，GB 9254-2008中关于不同测试距离场强换算的20 dB/10倍距离的反比因子只是一种近似。然后在10 m法半电波暗室中试验3 m和10 m测试距离处电场强度的变化。最终得出结论，不建议利用3m法辐射骚扰测试测得的场强值与标准中的限值进行比较，但是可以作为预测试进行受试设备的EMC整改。