摘要
用3米法和10米法半电波暗室测量辐射电磁骚扰时,在180~260 MHz频段上应用20 dB/10倍的反比因子归一化测量结果存在一定的偏差。3米法半电波暗室归一化后的结果偏小,导致最终被测试设备在3米法半电波暗室测量会比在10米法半电波暗室测量时,更容易满足辐射电磁骚扰的限值要求。分析了归一化偏差产生的原因,并提出了加入辅助的修正系数修正测试结果的方法。
By using the method of inverse proportionality factor of 20 dB per decade, the measurement results of radiated disturbance from 3 m test could be normalized to reconstruct data as measured by 10 m test method. However, this method could produce devia- tion in the frequency range of 180~260 MHz. Finally, the reason of deviation is analyzed, and the correction method is put forward.
关键词
偏差
辐射骚扰
反比因子
归一化
半电波暗室
CISPR22
deviation
radiated disturbance
inverse proportionality factor
normalize
semi-anechoic chamber
CISPR 22