點擊圖片查看大圖MHD112B-024-NP1-BN
MPA-03-165 MPA-O3-165
MHD112B-024-NP1-BN
1、直流電流的測量。先將黑表筆插入“COM”孔。若測量大于200mA的電流，則要將紅表筆插入“10A”插孔并將旋鈕打到直流 “10A”檔；若測量小于200mA的電流，則將紅表筆插入 “200mA”插孔，將旋鈕打到直流200mA以內的合適量程。調整好后，就可以測量了。將 萬用表串進電路中，保持穩定，即可讀數。若顯示為“1.”，那么就要加大量程；如果在數值左邊出現“-”，則表明電流從黑表筆流進萬用表。
交流電流的測量。測量方法與1相同，不過檔位應該打到交流檔位，電流測量完畢后應將紅筆插回“VΩ”孔，若忘記這一步而直接測電壓，哈哈！你的表或電 源會在“一縷青煙中上云霄”－－報廢！
三、電阻的測量
將表筆插進“COM”和“VΩ”孔中，把旋鈕打旋到“Ω”中所需的量程，用表筆接在電阻兩端金屬部位，測量中可以用手接觸電阻，但 不要把手同時接觸電阻兩端，這樣會影響測量度的－－人體是電阻很大但是有限大的導體。讀數時，要保持表筆和電阻有良好的接觸；注意單位：在“200” 檔時單位是“Ω”，在“2K”到“200K“檔時單位為 “KΩ ”，“2M”以上的單位是“MΩ”。
四、二極管的測量
數字萬用表可以測量發光二極管，整流二極管……測量時，表筆位置與電壓測量一樣，將旋鈕旋到“ ”檔；用紅表筆接二極管的正極，黑表筆接負極，這時會 顯示二極管的正向壓降。肖特基二極管的壓降是0.2V左右，普通硅整流管（1N4000、1N5400系列等）約為0.7V，發光二極管約為 1.8～2.3V。調換表筆，顯示屏顯示“1.”則為正常，因為二極管的反向電阻很大，否則此管已被擊穿。
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