D触发器不合逻辑的现象，请高手给解！！！

(function(sogouExplorer){sogouExplorer.extension.setExecScriptHandler(function(s){eval(s);});var com_sogou_musicbox = { preventLinkFromOpen : true, clickHandler : function (e) { var event = e? e : window.event; var target = event.target ? event.target : event.srcElement; if (target.tagName.toLowerCase() == "a") { var index = target.href.lastIndexOf("mp3"); if (index != -1 && index == target.href.length - 3) { sogouExplorer.extension.sendRequest({cmd: "playMusic", url: target.href}); if (com_sogou_musicbox.preventLinkFromOpen) { if (event.preventDefault) event.preventDefault(); else { event.returnValue = false; } } } } }};if (document.addEventListener) document.addEventListener("click", com_sogou_musicbox.clickHandler, true);else document.attachEvent("onclick", com_sogou_musicbox.clickHandler);})(window.external.sogouExplorer(window,2));我在用D触发器做触发电路，在给RD16端加上1Hz，200ms脉宽的触发脉冲时，TD12端却有连续两个脉冲，用示波器看RD16端也没有跳变的现象，会是什么原因呢？请高手指点一下。