当万用表处于二极管测试模式时,测试导线之间会产生适度的电压。 这个
当测试导线穿过正向偏置时,便会看到万用表上的电压下降。
二极管。在进行二极管测试时,应采取以下步骤:

确保电路没有电源,二极管没有电压。 有可能的是,
电路有电压,因为电容器带电。 电容器必须放电,如果这是
案情。 根据需要,设置万用表来测量交流电压或直流电压。
 将旋转开关设置为二极管测试位置。 它可以与另一个共享一个拨号盘位置
的特色。
 将二极管连接到测试导线上。 注意可见的测量值。
 把测试线索转过来。 注意可见的测量值。

好的正向二极管的典型硅二极管电压降在0.5到0.8伏之间。
某些锗二极管的电压损耗在0.2~0.3V之间。
当一个好的二极管反向偏置时,在万用表上可以看到OL。 二极管充当开路器
开关,根据OL读数。
缺陷(开路)二极管阻止电流向任何方向流动。 当二极管是
打开后,万用表便会同时出现OL信号。
短路二极管的电压降读数在两个方向上相同(约0.4V)。

如果万用表没有二极管测试模式,或者如前面提到的,作为额外的二极管测试,它可以是
在抵抗模式下使用。

当正极测试引线(红色)连接到阳极,负极测试引线(黑色)连接到阳极时,正极测试引线(红色)连接到阳极,负极测试引线(黑色)连接到阳极。
连接在阴极上,二极管是正偏置的。
 优质二极管应具有1000欧姆-10欧姆范围的正偏电阻。
 当二极管为正偏压时,万用表的电流通过二极管,产生电流。
测试所需的高电阻测量,使测试的电阻值与测试的电阻值一致。
测量值高

当正极(红色)测试导线在阴极上,负极(黑色)测试导线在阴极上时。
二极管是反向偏置的。
 一个好的二极管的反偏压电阻在万用表上显示OL。 如果读数相同
二极管在两个方向都有故障。

电阻模式程序:
1. 确保电路无电源,二极管无电压。 这有可能。
这个电路有电压,因为电容器是带电的。 电容器必须是
如情况属实,则须予以解除。 根据需要,将万用表设置为测量交流电或直流电
电压。
2. 将刻度盘调到电阻位置( )。 它可以与另一个功能共享一个拨号盘位置。
3. 二极管从电路中取出后,将测试导线连接到二极管上。 注意:
可见的测量。
4. 扭转测试线索。 注意可见的测量值。
5. 在电阻模式下测试二极管时,应将测试值与已知好的二极管进行比较,以获得最佳结果。
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