描述
1756-IA32
EMI测试技术
目前诊断差模共模干扰的三种方法：射频电流探头、差模抑制网络、噪声分离网络。用射频电流探头是测量差模 共模干扰最简单的方法，但测量结果与标准限值比较要经过较复杂的换算。差模抑制网络结构比较简单，测量结果可直接与标准限值比较，但只能测量共模干扰。噪声分离网络是最理想的方法，但其关键部件变压器的制造要求很高。
目前抑制干扰的几种措施
形成电磁干扰的三要素是干扰源、传播途径和受扰设备。因而，抑制电磁干扰也应该从这三方面着手。首先应该抑制干扰源，直接消除干扰原因;其次是消除干扰源和受扰设备之间的耦合和辐射，切断电磁干扰的传播途径；第三是提高受扰设备的抗扰能力，减低其对噪声的敏感度。目前抑制干扰的几种措施基本上都是用切断电磁干扰源和受扰设备之间的耦合通道，它们确是行之有效的办法。常用的方法是屏蔽、接地和滤波。
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