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電容器好壞判斷方法

時間:

2018-05-16


       電容器一般常見的故障有:開路、短路、漏電和電容量減小等。對于容量較大的電容器,用指針式萬用表電阻擋可以判別電容器好壞,對其質量進行定性分析。
 
       萬用表擋位選取原則:容量大,擋位??;容量小,擋位大。一般容量大于47 μF選R&acute;100擋,容量1~47 μF選R&acute;1 K擋,容量小于1μF選R&acute;10 K擋。
 
       首先短接電容兩支引腳(目的是釋放電容器儲存的電荷),然后把萬用表兩表筆并聯連接到電容兩支引腳上,觀察表盤指針擺動情況:若指針偏轉后迅速回到起點,則該電容器是好的;若指針不動,則該電容器已開路則該電容器漏電。  ;若指針指到“0 Ω”處不動,則已擊穿短路;若指針停在中間某刻度上,則該電容器漏電。  

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