推荐回答(1个)
你好!
如果你懂的用数字万用表 我教简单的方法。
万用表上面有很多挡 分别:电阻档 直流电源档 交流电源档 电容档 电流档 通断档等等。
如果一一说明 说不完的。
首先测试电阻单位有 欧 和 K 注意一下 测试方法一样,把万用表调到电阻档,2K 20K 200K 2M 20M 200M 这个档 您在测试的过程 不懂您手中的电阻的阻值为多少对把,把表调到20k这档进行测试,(注意最好手不要碰到笔头,因为身体也有阻值,会照成不稳定),如果 20k档读不出阻值 继续往下一档调直到读出阻值,每个档的倍数为10倍。
(如果显示1 或者显示0就说明这个阻值是无限大。)
测试电容:
万用表有带测试电容的功能 电容档 F 20n 200n 20U 200U,有的万用表直接有测试电容的插槽 但是 我个人感觉不好用。其实电容是最好测试的零件了 用一个5V 以上的电池或电源 给电容充电2秒 然后 将电容短路 看看有没有电火花就知道,或者冲完电,将万用表调致直流档 20V 看看有没有电压显示,没有就坏了。
二极管 三极管 场效应管 电源管 行管 等等 我个人习惯用通断档测试,真的好用,通断档也可以读出阻值的 ,用通断档测试以上管 2脚阻值显示在420到550之间都算正常,放大倍数也正常 如果阻止不稳定 或穿击 说明坏了,其实这是我的方法 至于测试方法还有很多 关键你要懂各种管子的工作原理管 你在知道怎样测试。例如三极管 三只脚都能读出阻值 而场效应管2只脚有阻值其余一直是控制的,可控硅 3只脚都没阻值,这不能说明它坏了把 ? 关键要懂哦!
大半夜4点 用手打的 希望可以帮助到你!
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