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手电钻的电噪声会使数字控制混乱,破坏生产过程。航空雷达信号可能抹去计算机存储单元中的数据记录。高频炉的干扰会打乱脉冲稳定的心脏起博器的节奏。诸如此类的公害促成从法律上规定,制造厂家和用户都要对其设备产生的电噪声负责。因此在设计电气设备时,应明确该设备的工作是否会受电磁干扰的影响或会产生电磁干扰。在任一情况下,排除电磁干扰有两种方法:滤掉信号或电源线中不需要的噪声信号;或是利用屏蔽防止穿过设备机壳的辐射电磁干扰。滤除方法近来已有论述。本文详细地讨论屏蔽方法。
The electric noise of the hand drill can confuse the digital control and destroy the production process. Aero radar signals may erase data records in a computer’s memory location. Interference from the HF furnace can upset the rhythm of the pulse-stabilized heart pacemaker. Public nuisances such as these have led to the legal requirement that manufacturers and users be responsible for the electrical noise generated by their equipment. Therefore, the design of electrical equipment, it should be clear that the work of the equipment will be affected by electromagnetic interference or electromagnetic interference. In either case, there are two ways to eliminate electromagnetic interference: filter out unwanted noise signals in the signal or power cords; or use shielding to prevent radiated electromagnetic interference through the equipment enclosure. The filtering method has been discussed recently. This article discusses the shielding method in detail.