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屏蔽室测量(30～200MHz) 1 引言 本文描述了如何有选择地放置辐射吸收材料(RAM),这种材料能够大大减小无衬屏蔽室中产生的电磁谐振的Q值。在屏蔽室中完成的EMC(电磁兼容性)性能试验结果与在其他室中进行的同样检测通常相差20dB或更多。这些结果由室谐振、天线位置和室内的EUT(被检测设备)决定。已对这些谐振做了详细研究,提到的衰减方法使发射测量同在开场区所做的、在30～200MHz频域内的一致性达到5dB以内。
Shielded room measurements (30 ~ 200MHz) 1 Introduction This paper describes how to selectively place a radiation absorbing material (RAM) that can greatly reduce the Q value of the electromagnetic resonance generated in a linerless shielded room. The result of the EMC test conducted in the shielded room is usually 20 dB or more different from the same test performed in the other room. These results are determined by the room resonance, antenna position and indoor EUT (device under test). These resonances have been studied in detail and the attenuation methods mentioned make the emission measurements made in the opening area within 5 dB of the 30 to 200 MHz frequency domain.