辐射电磁骚扰测量中归一化偏差分析

Analysis on the Deviation of Normalized Radiated Disturbance Measurement Results

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.