表面和體積電阻率測試儀裝置由于本儀器的分辯率很高，因而會引起顯示值的末尾幾位數也變化，這不是儀器本身的問題，而是被測量對象的導電機理復雜而使得阻值有些變化。在這種情況下往往取2位有效數就夠了。 絕緣漆表面體積電阻率測試儀體(ti)積電(dian)阻(zu)(zu)率和表面(mian)電(dian)阻(zu)(zu)率或電(dian)導率。適用于橡膠、塑(su)料、薄膜、及粉體(ti)、液體(ti)、及固(gu)體(ti)和膏體(ti)形狀的各種絕緣材料體(ti)積和表面(mian)電(dian)阻(zu)(zu)值的測定。

表面和(he)體積電阻率(lv)測(ce)試儀裝置注(zhu)意事項

1、測(ce)量時間(jian)對測(ce)量結果的影響

在(zai)測(ce)(ce)(ce)量(liang)(liang)電(dian)(dian)(dian)線(xian)電(dian)(dian)(dian)纜、大(da)型電(dian)(dian)(dian)機、變(bian)壓(ya)器(qi)等(deng)大(da)容(rong)(rong)(rong)量(liang)(liang)電(dian)(dian)(dian)器(qi)時(shi)(shi)(shi)(shi)，由于被(bei)(bei)(bei)測(ce)(ce)(ce)器(qi)件中(zhong)存在(zai)較(jiao)大(da)的(de)分布電(dian)(dian)(dian)容(rong)(rong)(rong)以(yi)(yi)及(ji)絕緣(yuan)材料的(de)介質吸(xi)收(shou)與極化現(xian)象，其(qi)充電(dian)(dian)(dian)時(shi)(shi)(shi)(shi)間常(chang)數可能(neng)高達數十分鐘，在(zai)測(ce)(ce)(ce)量(liang)(liang)開(kai)始時(shi)(shi)(shi)(shi)，電(dian)(dian)(dian)容(rong)(rong)(rong)性電(dian)(dian)(dian)流(liu)(liu)占(zhan)主導地位，電(dian)(dian)(dian)阻示值很小(xiao)，隨(sui)著電(dian)(dian)(dian)容(rong)(rong)(rong)電(dian)(dian)(dian)流(liu)(liu)逐漸衰減，儀(yi)表電(dian)(dian)(dian)阻示值呈(cheng)緩慢上升，這(zhe)是正常(chang)現(xian)象（如果(guo)電(dian)(dian)(dian)阻示值很快穩定(ding)，反而說明在(zai)測(ce)(ce)(ce)量(liang)(liang)開(kai)始時(shi)(shi)(shi)(shi)電(dian)(dian)(dian)導性泄漏電(dian)(dian)(dian)流(liu)(liu)就在(zai)在(zai)測(ce)(ce)(ce)量(liang)(liang)電(dian)(dian)(dian)流(liu)(liu)中(zhong)占(zhan)主導地位，北(bei)京檢測(ce)(ce)(ce)儀(yi)器(qi)這(zhe)是被(bei)(bei)(bei)測(ce)(ce)(ce)對象因受潮而導致絕緣(yuan)不良的(de)一個主要特(te)征）。為(wei)(wei)了取得一個比較(jiao)確(que)定(ding)的(de)測(ce)(ce)(ce)量(liang)(liang)結果(guo)，通(tong)常(chang)對被(bei)(bei)(bei)測(ce)(ce)(ce)器(qi)件規(gui)定(ding)一個特(te)定(ding)的(de)測(ce)(ce)(ce)量(liang)(liang)時(shi)(shi)(shi)(shi)間（如電(dian)(dian)(dian)線(xian)電(dian)(dian)(dian)纜規(gui)定(ding)為(wei)(wei)1分鐘），可以(yi)(yi)通(tong)過設置儀(yi)器(qi)的(de)定(ding)時(shi)(shi)(shi)(shi)器(qi)獲得所需的(de)定(ding)時(shi)(shi)(shi)(shi)時(shi)(shi)(shi)(shi)間。

2、重復(fu)測(ce)量(liang)對測(ce)量(liang)結果的影響

在(zai)測量(liang)(liang)(liang)(liang)電(dian)(dian)線電(dian)(dian)纜、大(da)型電(dian)(dian)機、變壓(ya)器(qi)(qi)(qi)(qi)等大(da)容量(liang)(liang)(liang)(liang)電(dian)(dian)器(qi)(qi)(qi)(qi)的絕緣電(dian)(dian)阻(zu)時，如(ru)在(zai)短時間內(nei)進行(xing)重(zhong)復(fu)(fu)測量(liang)(liang)(liang)(liang)，則二次(ci)(ci)測量(liang)(liang)(liang)(liang)示值將(jiang)明(ming)顯(xian)比第(di)一次(ci)(ci)測量(liang)(liang)(liang)(liang)示值高(gao)，這是(shi)由(you)于(yu)被測器(qi)(qi)(qi)(qi)件中存在(zai)第(di)一次(ci)(ci)測量(liang)(liang)(liang)(liang)所施加的殘余電(dian)(dian)荷的緣故。這些器(qi)(qi)(qi)(qi)件充電(dian)(dian)時間很長(chang)，同樣，放電(dian)(dian)時間也很長(chang)，在(zai)沒有(you)充分(fen)放電(dian)(dian)的情況下重(zhong)復(fu)(fu)測量(liang)(liang)(liang)(liang)，充電(dian)(dian)效果是(shi)疊加的，其等效作用是(shi)延長(chang)了后一次(ci)(ci)測量(liang)(liang)(liang)(liang)實際上的測量(liang)(liang)(liang)(liang)時間，電(dian)(dian)阻(zu)示值自然較高(gao)。因此，北京檢測儀器(qi)(qi)(qi)(qi)測量(liang)(liang)(liang)(liang)結果應以第(di)一次(ci)(ci)測量(liang)(liang)(liang)(liang)為準，如(ru)要(yao)進行(xing)第(di)二次(ci)(ci)測量(liang)(liang)(liang)(liang)則必須對被測器(qi)(qi)(qi)(qi)件進行(xing)充分(fen)放電(dian)(dian)后（一般為數十分(fen)鐘至數小時）才能進行(xing)。