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。 有些漏(lou)電(dian)(dian)(dian)(dian)的(de)電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)(qi),用(yong)上述方法不易準(zhun)確判斷(duan)出好壞(huai)。當電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)(qi)的(de)耐壓值(zhi)大于萬用(yong)表內(nei)(nei)電(dian)(dian)(dian)(dian)池電(dian)(dian)(dian)(dian)壓值(zhi)時(shi),根據電(dian)(dian)(dian)(dian)解電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)(qi)正向(xiang)充(chong)電(dian)(dian)(dian)(dian)時(shi)漏(lou)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)小,反向(xiang)充(chong)電(dian)(dian)(dian)(dian)時(shi)漏(lou)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)大的(de)特點(dian),可采用(yong) R×10K 擋,對電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)(qi)進行反向(xiang)充(chong)電(dian)(dian)(dian)(dian),觀察表針(zhen)停(ting)留處(chu)是(shi)否穩定(即反向(xiang)漏(lou)電(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)流(liu)是(shi)否恒定),由此(ci)判斷(duan)電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)(qi)質量,準(zhun)確度較(jiao)高(gao)。黑表筆接電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)(qi)的(de)負(fu)極(ji),紅(hong)表筆接電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)(qi)的(de)正極(ji),表針(zhen)迅速(su)擺起(qi),然后逐漸退至(zhi)某處(chu)停(ting)留不動(dong),則說明電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)(qi)是(shi)好的(de),凡(fan)是(shi)表針(zhen)在某一(yi)(yi)位置停(ting)留不穩或停(ting)留后又逐漸慢(man)慢(man)向(xiang)右移動(dong)的(de)電(dian)(dian)(dian)(dian)容(rong)(rong)器(qi)(qi)已經漏(lou)電(dian)(dian)(dian)(dian),不能繼續(xu)使用(yong)了(le)。表針(zhen)一(yi)(yi)般停(ting)留并穩定在 50 - 200K 刻(ke)度范(fan)圍內(nei)(nei)。
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