esd问答4.htm

该资料时关于EMC的相关问题

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    <p class=MsoNormal style='line-height:14.0pt'><span lang=EN-US
    style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    61</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：我们有一</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>10000</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'>级的洁净帐篷，在其内部，我们打算建造一个探究太空的装置。这个装置是依据光学原理设计的，对粒子和除气作用十分敏感。帐篷内还有大量的电子，我想知道清洁室和静电损耗要求下应使用的最好材料是什么？</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：清洁室内使用的最好材料是型号</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>L</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'>的地板垫子材料。每卷宽</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>0.60cm</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'>，长</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>122m</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'>，在清洁室要求下，腕套应用来连接地板垫子，这些材料均可从有关厂商订货。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    62</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：我们发现了磁疗的作用。在工作中，我们处于静电放电的环境中，工作服、鞋袜、腕套、椅子、离子发生器、几乎所有的东西都带静电。我们想知道穿这些内有磁性鞋垫的鞋是否将损坏生产的成品。我们在空气室里安装了电子传感器元件，磁疗对如此多的人起作用，因此我们不愿放弃。任意信息将会大大地得到重视。对吗？</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：你所说的具有磁疗作用的鞋垫不会干扰静电放电程序。仅有的一个例外是：如果电极头处的磁场很强，你的脚又十分缓慢地移过一低阻抗导体，那么你就会产生出电流，如果能量不能泄放掉的话，便会引起故障，时间一长的话就会使泄电积累到相当高的水平。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    63</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：在通过</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>MIL-883</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'>模型后，我们发现了一个不同的情形，当屏蔽元件从屏蔽袋内移走时，它会被静电放电损坏。我也正在查找这方面的书籍，即在静电放电袋里的元件在保护状态下工作时，其引线需剪短。如何解释这一现象？</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：当屏蔽元件从屏蔽袋里移走时，它可能损坏。产生的静电可以对一个物体充电（就象屏蔽袋里的元件一样），可以在移动过程中产生静电放电问题。在订购屏蔽袋时你需要指明抗静电的特征参数。抗静电指的是材料所表现出来的摩擦充电行为。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    64</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：我正努力寻找可与</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>MIL-W-80</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'>标准相符的公司，这是一个与静电损耗性丙烯酸纤维或丙烯酸涂层相关的</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>1966 MIL</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。请给予详细说明。</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'>MIL-W-80</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'>指的是片状或带状的固体物质，不能应用到地板涂层上。地板涂层也与几个工业公认标准（</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>ANSI/ESD-S7.1</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'>地板涂层表面阻抗的标准，</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>AATCC TM-134-1979</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'>是地板涂层产生静电的标准，</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>FTMS 101C</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'>M-4046</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'>是地板涂层的电荷衰减标准）相符。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    65</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：我的公司生产计算机，其可靠性测试之一是静电放电。测试时所采用的标准是</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>IEC-810-4 L3</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'>，空气：</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>8kV</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'>，搭接电压：</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>6kV</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'>。但我们想卖给美国加州的一个购买单位。请问用来测试时的静电放电电压有多少千伏？</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：在测试静电放电敏感性时，所采用的测试方法有以下三种：</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'>人体模型（＋</span><span lang=EN-US
    style='font-size:9.0pt;font-family:Arial'>4000V</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'>和－</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>4000V</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'>的电压波形，</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>0</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'>和</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>500</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'>的负载）</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'>充电元件模型（可达到</span><span lang=EN-US
    style='font-size:9.0pt;font-family:Arial'>2000V</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'>的电压波形）</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'>机械模型（＋</span><span lang=EN-US
    style='font-size:9.0pt;font-family:Arial'>400V</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'>和－</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>400V</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'>的电压波形，</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>0</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'>和</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>500</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'>的负载）</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'>　　这包括了电压极限在内，注意根据不同的负载阻抗，会有不同的波形需求。在美国万宝路，麻萨诸塞州，在罗马，纽约的静电放电协会，这些标准对静电放电系统是有效的。</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'><br>
    <br>
    66</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：我有一个干粉灭火器，当粉末被一螺旋状的传送装置向上挤时，它会通过一金属探测器注入到一直径</span><span
    lang=EN-US style='font-size:9.0pt;font-family:Arial'>15.2cm</span><span