500) {this.resized=true; this.width=500; this.alt='这是一张缩略图，点击可放大。\n按住CTRL，滚动鼠标滚轮可自由缩放';this.style.cursor='hand'}" onclick="if(!this.resized) {return true;} else {window.open('http://u.dianyuan.com/bbs/u/23/1100639478.jpg?x-oss-process=image/watermark,g_center,image_YXJ0aWNsZS9wdWJsaWMvd2F0ZXJtYXJrLnBuZz94LW9zcy1wcm9jZXNzPWltYWdlL3Jlc2l6ZSxQXzQwCg,t_20');}" onmousewheel="return imgzoom(this);">有一电路,地线放电,请教?有图
本人试验了一个电路输出脉冲,地线接到一个设备的机壳上.第一次可以工作.第二次接到机壳上的地线与机壳接触点放电崩开.第三次地线接到大地上,结果还是墙壁开关跳闸.什么原因???下面是试验电路图
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