描述
A16B1200-0720/06A
干扰的作用方式
按干扰作用方式的不同，干扰可分为：差模干扰、共模干扰和长线传输干扰。
差模干扰：也称串模干扰，就是串联与信号源回路之中的干扰。它串联在信号源回路中，与被测信号相加后输入系统。产生差模干扰的因素主要有分布电容的静电耦合、空间的磁场耦合、长线传输的互感、50HZ的工频干扰，以及信号回路中元件的参数变化等。
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。
长线传输干扰：在计算机控制系统中，现场信号到控制计算机以及控制计算机到现场执行机构，都需要一段较长的线路进行信号传输，即长线传输。对于高速信号传输的线路，即在高频信号电路中，多长的导线可作为长线，取决于电路信号频率的大小，在有些情况下，可能1m左右的线就应作为长线看待。
信号在长线中传输会遇到三个问题：一是高速变化的信号在长线中传输时出现的波反射现象，二是具有信号延时，三是长线传输会遇到外界干扰。
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