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一、电压档：
在检测或制作时，可以用来测量器件的各脚电压，与正常时的电压比较，即可得出是否损坏。还可以用来检测稳压值较小的稳压二极管的稳压值，其原理如 图：Ｒ为１Ｋ，电源端的电压视稳压管的标称稳压值而定，一般比标称电压大３Ｖ以上，但不要超过１５Ｖ。再用万用表检测Ｄ管两端电压值，此值既为Ｄ管实际稳 压值。
二、电流档
将表串入电路中，对电流进行测量和监视，若电流远偏离正常值（凭经验或原有正常参数），必要时可以调整电路或者需要检修。还可以利用该表的20A档测 量电池的短路电流，即将两表笔直接接在电池两端。切记时间绝对不要超过1秒！注意：此方法只适用于干电池，5号，7号充电电池，且初学者要有熟悉维修的人 员指导下进行，切不可自行操作！根据短路电流即可判断电池的性能，在满电的同种电池的情况下，短路电流越大越好。
三、电阻档；
可用于判断电阻，二极管，三极管好坏的方法之一。对于电阻其实际阻值偏离标称值过多时则已损坏。对于二三极管，若任两脚间的电阻都不为很大值（几百K 以上），则可认为性能下降或者已击穿损坏，注意此三极管是不带阻的。此法也可用于集成块，须要说明的是：集成块的测量只能和正常时参数作比较。
四、现在普通万用表的表笔都存在阻值较大，有兴趣的爱好者可自行制作一副表笔；方法：准备一米左右的优质音箱线或者多蕊铜电线，带绝缘套的夹子一对 （红黑色），用于音箱接线的香蕉插一对（红黑色）；线的一端焊牢在夹上，另一端相应接入香蕉插中；一副优良的表笔即大功告成。
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