esd问答4.htm

该资料时关于EMC的相关问题

    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>，长</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>91 cm</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>的不锈钢管中。当消防人员一接触灭火器的盖子时就会发生静电放电现象。我们努力将所有金属部分连接到同一单点接地点，而且在地板上放置一抗静电垫子。消防人员全身着全棉服装，这样就可到处走动且不需带腕套，对此还有什么好的建议吗？</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>答：当干粉通过不锈钢管并注满灭火器时，干粉和灭火器正在产生摩擦电。操作人员最可能感觉到静电泄电是由于这个过程引起的。你可试着将所有金属部件与单点接地点（</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>CPG</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>）连接，并使用抗静电地板垫子。你已经采取了一些重要的静电放电控制程序，但仍没有解决你的问题。你需要检查以下几点：</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>　</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>1</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>、</span><span
    style='font-size:9.0pt;font-family:Arial'> </span><span style='font-size:
    9.0pt;font-family:宋体;mso-ascii-font-family:Arial;mso-hansi-font-family:
    Arial;mso-bidi-font-family:Arial'>灭火器封盖应导电用与同一单点接地点连接。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>　</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>2</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>、</span><span
    style='font-size:9.0pt;font-family:Arial'> </span><span style='font-size:
    9.0pt;font-family:宋体;mso-ascii-font-family:Arial;mso-hansi-font-family:
    Arial;mso-bidi-font-family:Arial'>灭火器壳体应是导电的，也要与同一单点接地点连接。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>　</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>3</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>、</span><span
    style='font-size:9.0pt;font-family:Arial'> </span><span style='font-size:
    9.0pt;font-family:宋体;mso-ascii-font-family:Arial;mso-hansi-font-family:
    Arial;mso-bidi-font-family:Arial'>如果上述两者均不导电，那么就应该考虑使用电离。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>　</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>4</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>、</span><span
    style='font-size:9.0pt;font-family:Arial'> </span><span style='font-size:
    9.0pt;font-family:宋体;mso-ascii-font-family:Arial;mso-hansi-font-family:
    Arial;mso-bidi-font-family:Arial'>抗静电地板垫子可以是导电的也可以是损耗性的，并且应连接到同一单点接地点。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>　</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>5</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>、</span><span
    style='font-size:9.0pt;font-family:Arial'> </span><span style='font-size:
    9.0pt;font-family:宋体;mso-ascii-font-family:Arial;mso-hansi-font-family:
    Arial;mso-bidi-font-family:Arial'>所有操作人员都应穿一双</span><span lang=EN-US
    style='font-size:9.0pt;font-family:Arial'>2M</span><span style='font-size:
    9.0pt;font-family:宋体;mso-ascii-font-family:Arial;mso-hansi-font-family:
    Arial;mso-bidi-font-family:Arial'>的防静电鞋，且与导电接地垫子相连，这样他们就不会在灭火器的封盖处成为静电放电事件的激励源。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>　　只要按上述步骤来正确执行，你的问题就应得到控制。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    67</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>、问：最近，我用两块带有不同电荷的金属板（一块较小，一块较大且规则），即电荷板分析仪检验离子束，在同一区域及离子束间距两种方式下进行读数取样，发现较小的一块大约</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>6V</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>左右，而较大的一块示值为－</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>8V</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>。当尽力使离子束间距一样时，我该取哪一个值？当检测金属板时的读数显示为＋</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>/</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>－</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>X</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>伏时，这是代表总体电压的</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>X%</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>或是与正在检测的电荷有关呢？（例如，</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>1500V</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>的</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>1%</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>或</span><span
    style='font-size:9.0pt;font-family:Arial'> <span lang=EN-US>8V</span></span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>的</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>1%</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>？）</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>答：首先，对电荷板分析仪的两个分块分别进行检查，从而将其校准以确保它的准确性。其次，检验测量精度的产品说明书。第三，电荷板面积可以不同。离子束沿其轴向长度有几个发射源，确信你在同一距离且覆盖同一区域。如果发射源是直流的，且每隔一英寸其极性改变一次，你所进行的测量会由于电荷板的位置不同而受到影响。精确度应与电荷板测量出来的电压读数有关。检查产品数据图以确认它可应用到你的单元电路中。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    68</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>、问：工厂生产车间的地板多数都铺有一层静电损耗性瓷砖，但也有一些角落未铺。地板是混凝土结构的，我想知道这种办法是否具有足够的损耗性？在地板上涂上一层诸如导电蜡之类的导电涂层会起作用吗？</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>答：单独的混凝土不会形成完整的静电放电地板。即使在地板上，地下水可以通过渗出口渗出，从而使混凝土导电，但总有一些干湿不一致的地方。很显然，导电蜡是有用的，我们最好将导电蜡视为地板的涂层，因为涂层里没有蜡，蜡是绝缘的。在地板上涂蜡前，你应将混凝土地板掩盖严实以避免水引起的粘接不良问题，同时这也能增加地板涂层的覆盖度（通过减少地板的孔隙度）。其他的解决方案有：给混凝土地板涂上一层导电漆；用导电瓷砖或地板垫子；铺导电地毯或划分出一块区域作为非静电放电安全区。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    69</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>、问：我对防静电鞋很感兴趣，但不清楚静电放电地板必须具备的东西或者是说明书。如果要试地板的静电放电可塑性，必须采取什么措施，请给出一些建议，另外，地板满足要求的具体实施方案是怎样的呢？</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>答：根据标准</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>EIA-625</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>，静电放电地板的电阻应大于</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>105</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>且小于</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>109</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>。静电放电协会有一个试行标准</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>ESD DSTM54.1-1997</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>，在测量电阻时，它将地板材料及鞋类物品归并在一起。这实际是一种测量方法，没有规定或建议工作在阻性区间。事实上，为了测试地板，标准</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>ANSI/ESD-S7.1-1994</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>有明确的测试方法，即用两个五磅的探针驱动</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>10V</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>或</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>100V</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>的电压。使用的仪器是</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>41273</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>型号的，专门在做这种测量时使用。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    70</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>、问：</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>CMOS</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>集成芯片在经受严重静电放电的泄电冲击后，其可靠性会降级吗？</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    </span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>答：如果泄电的路径包括</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>CMOS</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>器件输入（针可焊点）端之一时，那么剧烈的静电放电将会使</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>CMOS</span><span
    style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:Arial;
    mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>单元电路产生不稳定现象。这会使相关元件的寿命缩短且会产生间歇的故障。你可以切开有故障的元件封装，并将其放在高倍显微镜或扫描电子显微镜下，你就可看到已损坏的区域。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    71</span><span style='font-size:9.0pt;font-family:宋体;mso-ascii-font-family:
    Arial;mso-hansi-font-family:Arial;mso-bidi-font-family:Arial'>、问：无线静电放电保护指的是什么？</span><span