Common mode interference:There is usually a distance between the ground of the computer used for process control,the ground of the signal amplifier and the ground of the on-site signal source,up to tens of meters or even hundreds of meters,and there is often a gap between the two grounding points.A potential difference,the interference of this potential difference to the amplifier,is called common mode interference,also known as common mode interference or longitudinal interference.This interference can be DC interference or AC interference,and its amplitude can be several volts or even higher,depending on the environmental conditions that generate the interference on site and the grounding of computers and other equipment.
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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