摘要
使用实际样品在四个不同的标准十米法半电波暗室中进行辐射骚扰测试的比对,测试结果最大辐射骚扰场强差异出现在45 MHz,差异达11.9 dB。经过分析实验室插座端口的共模阻抗后,观察到共模阻抗的大小与测试场强的高低相关联。专门设计与制作一个共模阻抗稳定网络,可以在30~400 MHz提供固定的共模阻抗。在测试时使用该共模阻抗稳定网络,可以消除共模阻抗不同引入的测试差异,测试结果在45 MHz的测试场强差异降到2.7 dB。
A real world sample was used for radiated emission test at four 10m-range semi-anechoic chambers.The results show that the maximum test difference is 11.9 dB at 45 MHz.After measuring the common-mode(CM)impedance at laboratories,strong correlation was found between emission level and CM impedance.A commonimpedance stabilization network was designed and built to provide constant CM impedance during the frequency range from 30 MHz to 400 MHz.By applying this network to remove the variation due to CM impedance,the test difference reduced from 11.9 dB to 2.7 dB at 45 MHz.
出处
《日用电器》
2020年第9期79-82,88,共5页
ELECTRICAL APPLIANCES
关键词
共模阻抗稳定网络
辐射发射测试
电源插座端口阻抗
common-mode impedance stabilization network
radiated emission tests
power line impedance
