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3A99132G02
3A99132G02
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注意：这种测量方法只是一种比较粗略的估测，有些绕组匝间绝缘轻微短路的变压器是检测不准的。4.7电阻器的阻值简易测试
在路测量电阻时要切断线路板电源，要考虑电路中的其它元器件对电阻值的影响。如果电路中接有电容器，还必须将电容器放电。万用表表针应指在标度尺的中心部分，读数才准确。
4.8贴片式元器件
(1)贴片式元器件种类
变频器电子线路板现在大部分采用贴片式元器件也称为表面组装元器件，它是一种无引线或引线很短的适于表面组装的微小型电子元器件。贴片式元器件品种规格很多，按形状分可分为矩形、圆柱形和异形结构。按类型可分为片式电阻器、片式电容器、片式电感器、片式半导体器件(可分为片式二极管和片式三极管)、片式集成电路。
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