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1、直流电流的测量。先将黑表笔插入“COM”孔。若测量大于200mA的电流，则要将红表笔插入“10A”插孔并将旋钮打到直流 “10A”档；若测量小于200mA的电流，则将红表笔插入 “200mA”插孔，将旋钮打到直流200mA以内的合适量程。调整好后，就可以测量了。将 万用表串进电路中，保持稳定，即可读数。若显示为“1.”，那么就要加大量程；如果在数值左边出现“-”，则表明电流从黑表笔流进万用表。
交流电流的测量。测量方法与1相同，不过档位应该打到交流档位，电流测量完毕后应将红笔插回“VΩ”孔，若忘记这一步而直接测电压，哈哈！你的表或电 源会在“一缕青烟中上云霄”－－报废！
三、电阻的测量
将表笔插进“COM”和“VΩ”孔中，把旋钮打旋到“Ω”中所需的量程，用表笔接在电阻两端金属部位，测量中可以用手接触电阻，但 不要把手同时接触电阻两端，这样会影响测量精确度的－－人体是电阻很大但是有限大的导体。读数时，要保持表笔和电阻有良好的接触；注意单位：在“200” 档时单位是“Ω”，在“2K”到“200K“档时单位为 “KΩ ”，“2M”以上的单位是“MΩ”。
四、二极管的测量
数字万用表可以测量发光二极管，整流二极管……测量时，表笔位置与电压测量一样，将旋钮旋到“ ”档；用红表笔接二极管的正极，黑表笔接负极，这时会 显示二极管的正向压降。肖特基二极管的压降是0.2V左右，普通硅整流管（1N4000、1N5400系列等）约为0.7V，发光二极管约为 1.8～2.3V。调换表笔，显示屏显示“1.”则为正常，因为二极管的反向电阻很大，否则此管已被击穿。
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