解决电磁兼容实验室电源传导背景噪声的方法

A Method on Solution to Problem of Background Noise in EMC Laboratories

中频电源在GJB 151/152A的CE102项目测试中的背景噪声超标是很多军用电磁兼容实验室无法解决的问题。这种情况严重影响到产品测试结果的准确性。文中从滤波的角度,引入插入损耗的概念以提高滤波器的插入损耗来降低电源输出的低频噪声。同时结合工作中对中频电源改造的经验,提出对中频电源的低频输出进行滤波方法,供相关实验室参考和探讨。

The excess of standard limit on background noise of intermediate frequency power supply in CE102 of GJB 151/152A is a difficult problem which can＇t be solved by many EMC laboratories . It affects the testing result accuracy of products seriously. In this paper, from view point of filtering a concept of insertion loss is introduced so as to lower the low frequency noise output of power supply through increasing the insertion loss of filter. At the same time, using the experience obtained from modification of IF power supply, we suggest a method of filtering the low frequency output of IF power supply for reference and study by relevant labolatories.