众所周知,随着仪表灵敏度的提高,应用范围和场合的扩大,对仪表抗干挠能力的要求就愈高。有时,甚至因为缺乏正确的屏蔽连接,使在良好外部条件下具有性能设计优良的部件在实际使用中失效。对加有“完全封闭”的金属罩壳的部件屏蔽,并不因为罩内电场的环路积分等于零而简单起来;这是因为罩与被屏蔽的线路之间存在着寄生互容,把“干挠”耦合到线路中去。因此,抗干挠屏蔽除了要有完整的静电封闭外,还应控制可能的外来干挠 As we all know, as the instrument sensitivity increases, the scope of application and the expansion of occasions, the higher the requirements of the instrument anti-scratch ability. Sometimes, parts that have good performance in good external conditions fail to function in real-life, even because of the lack of proper shield connections. Shielding a component with a “fully enclosed” metal enclosure is not as simple as the loop integral of the electric field in the enclosure equals zero; this is because there is parasitic tolerance between the shroud and the shielded line, Scratch "into the line. Therefore, the anti-dry shield in addition to have a complete electrostatic closure, but also should control the possible foreign interference