保护地线引发特殊短路故障的排除方法

Removal of the short circuit obstacles caused by the safety ground wire

论述电子仪器中的保护地线、信号地线各自的作用 .多台仪器组合时二者既可相互独立、又可直接短接使用 ,但是 ,当电子仪器 (在出厂时 )已将二者短接的情况下 ,进行多台仪器组合测试时 ,若连接不当可能引发意想不到的特殊短路现象 ,造成不必要的财产损失 .本文分析了这种特殊短路现象产生的原因 。

The function of two different kinds of ground wires (safety ground wire and signal zero reference wire) is discussed. The ground wires can be used independently or directly linked when different instruments are combined together. Once these wires have been shortly linked while the machine manufactured, any improper connection may bring about unexpected 'short circuit' phenomenon resulting in large property losses. The causes of these special short circuit phenomenon as well as the methods to avoid them are presented.