Description
共模干扰：用于过程控制的计算机的地、信号放大器的地和现场信号源的地之间通常要隔一段距离，长达几十米甚至上百米，在两个接地点之间往往存在一个电位差，这个电位差对放大器的干扰，称为共模干扰，也称为共态干扰或纵向干扰。这种干扰可以是直流干扰也可以是交流干扰，其幅值可以是几伏甚至更高，取决于现场产生干扰的环境条件和计算机等设备的接地情况。
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