分析了电磁干扰及其对系统干扰的机制，指出在工程应用时必须综合考虑系统的抗干扰性能，防止通过变送器和共用信号仪表供电的配电器引入的干扰，并提出了几种有效的抗干扰措施。 The electromagnetic interference and its mechanism of interference to the system are analyzed. It is pointed out that the anti-jamming performance of the system must be considered synthetically in engineering application, the interference introduced by the distributor supplied by the transmitter and the common signal meter is prevented, and several effective Anti-interference measures.