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晨飞资讯</a> » <a href="/Article/nizhidaokaiguandiany_1.html">你知道开关电源变压器的测试方法吗?/a></div>
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你知道开关电源变压器的测试方法吗?/h3>
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<span>文章出处?a href=""><a href="http://cfdz.nsw888.com">深圳市晨飞电子有限公?/a></a></span><span>网责任编辑：<a href="http://cfdz.nsw888.com">NSW</a></span><span>作者：<a href="http://cfdz.nsw888.com">NSW</a></span><span>人气?span
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<p> <span style="font-size: 16px">1、外观检查：开关电源变压器工作频率较高，罕见故障是绕组之间漏电或短路，?5625Hz一般使用磁性资料来导磁，检查时首先应从外表来观察是否有打火烧焦的痕迹，外表是否太脏，各引脚间是否有污物(有些开关电源变压器各引脚间距很?由于开关电源变压器是紧贴印刷电路板安装的容易积灰，碰到气候或环境湿润时易放电打火?/span></p>
<p> </p>
<p><span style="font-size: 16px"> 2、万用表测试?/span><strong><a href="http://www.chenfeipower.com/Products/ETD44gaopinbianyaqil.html"><span style="font-size: 16px">开关电源变压器</span></a></strong><span style="font-size: 16px">外观无问题，判断线圈是否有断路故障，可用万用表丈量其电阻值，用万用表对短路较为严重的开关电源变压器也可测出，丈量时可选择适当的电阻档，使测量的电阻值在中值附近，根据绕组的匝数及使用的线径，查出漆包线的每米欧姆值，计算绕组的欧姆值，与测量的电阻值比较，就能判断是否有短路现象，但这只是粗略丈量，有些开关电源变压器由于匝间绝缘击穿，或层间绝缘击穿，电阻值相差不多，就不一定能测量出来。开关电源变压器各绕组之间的绝缘电阻为无穷大，各绕组和磁?铁芯)之间的绝缘电阻也应该使无穷大?/span></p>
<p> </p>
<p><span style="font-size: 16px"> 3、替代丈量：可采用替代测试，若手头有一只同规格的开关电源变压器。该法直观、省事?/span></p>
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