esd问答4.htm

该资料时关于EMC的相关问题

    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：唯一适用的迫使空气电晕放电进而离子化的措施可广泛用作“空气离子发生器”。静电放电系统有好几个模型供选择，唯一取消的是放电时间，它取决于电荷泄放速率，空气流通速度和接近度最多接近于</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'>秒，在产品生产期间急需保护的措施，但是在使用接地的腕套和静电放电地板垫子，第二种保护措施也是可行的。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    72</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：如何判断抗静电屏蔽袋的失效，例如，袋上有折痕或者是小的孔洞。</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：在</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>MIL-B-81705C</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'>标准文件中可以找到你的所有答案，特别地，如果一个抗静电屏蔽袋（型号</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>III</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'>）满足以下任意一个条件，则可以将其视为无效：</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'>* </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'>静电袋发生标准</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>MIL-B-81705C</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'>中</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>4.8.4.1</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'>节中详细说明的分层现象。</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'>* </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'>静电泄电衰减率大于</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'>秒。</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'>* </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'>衰减电磁干扰不到</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>10dB</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>
    </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'>* </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'>小孔的直径大于</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>2mm</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>
    </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'>* </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'>不能屏蔽</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>30kV</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'>以下的静电放电事件。</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'>* </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'>里外每平方面积上的表面电阻大于</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>1012</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'>，内部每平方面电阻小于</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'>。</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'>　　总之，由于法拉第效应，如果屏蔽袋上有折痕或小孔，那么它仍有屏蔽作用。不过将这些静电袋扔掉是更安全的，这可能会花费更多的测试费，证明合格后只需将其替换掉。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    73</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'><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'>、用于生产硬盘的等级</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>100</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'>的清洁室，其标称湿度水平是多少？</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
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>Pomalux</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'>是我知道的在静电放电安全性方面最好的唯一一种塑料物质，但却相当昂贵，还有其他类似的材料吗？</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'>、有没有通用的离子发生器？如果有，什么厂商生产呢？怎样才能检验它的结果是否正确？</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'>静电传感器的读数为什么会大幅度地变化？（也就是说没有重复性或大范围跃变。）</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：</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'>：良好的标称湿度在</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>40%</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'>55%</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'>之间。你需最大限度地减小腐蚀，同时又要尽可能地加强静电放电保护。有可以测试湿度的纸张可供你方便之用。</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'>：静电安全性良好的材料还有乙烯树脂、橡胶、硬纸板和聚乙烯等，这取决于你所应用的场合。静电放电安全也意指抗静电特性、损耗特性及屏蔽特性，这也同样取决于你所应用的场合。</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'>与</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'>：电荷板会析仪是监视电晕放电型的空气载流子离子发生器的首选仪器。而且，静电传感器每次测量一个小的区域，静电荷在导电或绝缘表面不必均衡。如果某一物质遭受到电场或摩擦电激励，自由电子就会发生不平衡现象。平衡不总是一致的，静电计传感器与所测表面的距离也会进一步使这种平衡发生变化。所测表面的几何结构也可以导致场强的变化，例如，曲面（柱状金字塔形）比较平的表面具有更强的场，因为电荷总是积聚在物体尖端处。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    74</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'><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