視電解電容器容量大小,通常選用萬用表的 R×10 、 R×100 、 R×1K 擋進行測試判斷。紅、黑表筆分別接電容器的負極(每次測試前,需將電容器放電),由表針的偏擺來判斷電容器質量。若表針迅速向右擺起,然后慢慢向左退回原位,一般來說電容器是好的。如果表針擺起后不再回轉,說明電容器已經擊穿。如果表針擺起后逐漸退回到某一位置停位,則說明電容器已經漏電。如果表針擺不起來,說明電容器電解質已經干涸推失去容量。 有(you)些漏電(dian)(dian)(dian)(dian)(dian)的(de)(de)電(dian)(dian)(dian)(dian)(dian)容(rong)器,用(yong)上述方法不(bu)(bu)易準確判斷(duan)出好壞。當電(dian)(dian)(dian)(dian)(dian)容(rong)器的(de)(de)耐壓值大于(yu)萬(wan)用(yong)表(biao)(biao)內電(dian)(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)(dian)壓值時,根據電(dian)(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)(dian)容(rong)器正向(xiang)充電(dian)(dian)(dian)(dian)(dian)時漏電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)小,反向(xiang)充電(dian)(dian)(dian)(dian)(dian)時漏電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)大的(de)(de)特(te)點,可(ke)采用(yong) R×10K 擋,對(dui)電(dian)(dian)(dian)(dian)(dian)容(rong)器進行(xing)反向(xiang)充電(dian)(dian)(dian)(dian)(dian),觀察表(biao)(biao)針(zhen)停留處是(shi)否(fou)穩定(即反向(xiang)漏電(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)是(shi)否(fou)恒定),由此判斷(duan)電(dian)(dian)(dian)(dian)(dian)容(rong)器質量(liang),準確度(du)較高。黑表(biao)(biao)筆(bi)接電(dian)(dian)(dian)(dian)(dian)容(rong)器的(de)(de)負(fu)極,紅表(biao)(biao)筆(bi)接電(dian)(dian)(dian)(dian)(dian)容(rong)器的(de)(de)正極,表(biao)(biao)針(zhen)迅速擺起,然(ran)后逐(zhu)漸退至某(mou)處停留不(bu)(bu)動,則說明電(dian)(dian)(dian)(dian)(dian)容(rong)器是(shi)好的(de)(de),凡是(shi)表(biao)(biao)針(zhen)在(zai)某(mou)一(yi)位置停留不(bu)(bu)穩或停留后又逐(zhu)漸慢(man)慢(man)向(xiang)右移動的(de)(de)電(dian)(dian)(dian)(dian)(dian)容(rong)器已經漏電(dian)(dian)(dian)(dian)(dian),不(bu)(bu)能繼(ji)續使用(yong)了。表(biao)(biao)針(zhen)一(yi)般停留并穩定在(zai) 50 - 200K 刻度(du)范(fan)圍內。
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