EMC-CBR故障诊断研究（一）
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该系列文章致力于建立一个基于CBR（Case-Based Reasoning）的电磁兼容故障诊断系统模型。这篇文章将首先阐述用语义网络对故障进行表示。
Case6：
【故障特征】：辐射骚扰测试，120MHz附近多个频点超标
合式公式表示为(默认频率单位MHz)：
Test_content(RE) ∧Exceed_standard(Range(120))
【系统结构】：某模块安装在屏蔽底板上，模块与底板连接器处已经用导电胶条进行了屏蔽处理，并与底板的金属部分之间采用了“360°”搭接；产品采用屏蔽结构；模块安装处辐射最大
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合式公式表示为
Part_of(module_x, product)∧Connect_to(module_x, connector)∧Shielding(connector ,conductive_tape)∧Main_problem(connector, RE)∧Connect_to(bottom_plane, connector)∧Part_of(bottom_plane, product)∧Part_of(metal_area, bottom_plane)∧Object(bond, metal_area)∧Main_body(bond, module_x)∧Bond_type(bond, 360_degree)
【原因分析】：产品采用了屏蔽结构，所以必定是缝隙辐射造成的超标；产品进行了屏蔽和搭接，还能测到很大的辐射，必定是因为导电胶条与模块屏蔽体或导电胶条与底板屏蔽体之间的“360°”搭接不理想，存在阻抗不连续或结构意义上的缝隙。
【解决措施】：
<!--[if !supportLists]-->（1） <!--[endif]-->用较厚的导电橡胶代替原来的导电橡胶，使导电橡胶的压缩量增加，便可以满足测试要求；
<!--[if !supportLists]-->（2） <!--[endif]-->将底板中的PCB模块垫高（也可达到同样效果）。
【相关结论】：
<!--[if !supportLists]-->（1） <!--[endif]-->使用导电橡胶、衬垫之类的屏蔽材料时，不但要保证接触面上的良好的导电性（接触面去除所有漆），而且还要保证一定的压缩量。
<!--[if !supportLists]-->（2） <!--[endif]-->缝隙也是天线。
<!--[if !supportLists]-->（3） <!--[endif]-->一个EMC观点上搭接良好的等电位系统是指：搭接点直接的电阻小于2mΩ，并且整个预期的等电位系统的任何两点之间的电阻小于25mΩ。