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)(ti)積電(dian)阻(zu)率(lv)(lv)和(he)表面電(dian)阻(zu)率(lv)(lv)或電(dian)導率(lv)(lv)。適用于橡(xiang)膠(jiao)、塑料(liao)(liao)、薄(bo)膜、及粉體(ti)(ti)、液(ye)體(ti)(ti)、及固體(ti)(ti)和(he)膏體(ti)(ti)形狀的(de)各種絕緣(yuan)材料(liao)(liao)體(ti)(ti)積和(he)表面電(dian)阻(zu)值(zhi)的(de)測定(ding)。

表(biao)面和體積(ji)電(dian)阻率測試儀裝置注意(yi)事(shi)項

1、測量時間對測量結果(guo)的影響

在(zai)測(ce)(ce)量(liang)電(dian)(dian)(dian)(dian)線電(dian)(dian)(dian)(dian)纜、大(da)(da)型電(dian)(dian)(dian)(dian)機(ji)、變(bian)壓器等(deng)大(da)(da)容(rong)量(liang)電(dian)(dian)(dian)(dian)器時(shi)(shi)，由于(yu)被(bei)測(ce)(ce)器件中(zhong)存在(zai)較大(da)(da)的(de)(de)(de)(de)分(fen)布電(dian)(dian)(dian)(dian)容(rong)以及絕(jue)(jue)緣材(cai)料的(de)(de)(de)(de)介質吸收與極(ji)化現(xian)象，其充電(dian)(dian)(dian)(dian)時(shi)(shi)間(jian)(jian)常數可(ke)能高達數十分(fen)鐘(zhong)，在(zai)測(ce)(ce)量(liang)開始(shi)時(shi)(shi)，電(dian)(dian)(dian)(dian)容(rong)性(xing)電(dian)(dian)(dian)(dian)流占主(zhu)導(dao)地(di)位(wei)，電(dian)(dian)(dian)(dian)阻(zu)(zu)示(shi)(shi)值很(hen)小(xiao)，隨著(zhu)電(dian)(dian)(dian)(dian)容(rong)電(dian)(dian)(dian)(dian)流逐漸衰(shuai)減，儀表電(dian)(dian)(dian)(dian)阻(zu)(zu)示(shi)(shi)值呈緩慢上升(sheng)，這(zhe)是(shi)正常現(xian)象（如(ru)果(guo)電(dian)(dian)(dian)(dian)阻(zu)(zu)示(shi)(shi)值很(hen)快穩(wen)定(ding)(ding)，反而說明在(zai)測(ce)(ce)量(liang)開始(shi)時(shi)(shi)電(dian)(dian)(dian)(dian)導(dao)性(xing)泄漏電(dian)(dian)(dian)(dian)流就在(zai)在(zai)測(ce)(ce)量(liang)電(dian)(dian)(dian)(dian)流中(zhong)占主(zhu)導(dao)地(di)位(wei)，北京檢測(ce)(ce)儀器這(zhe)是(shi)被(bei)測(ce)(ce)對(dui)象因受潮而導(dao)致絕(jue)(jue)緣不(bu)良(liang)的(de)(de)(de)(de)一(yi)個(ge)(ge)主(zhu)要特征）。為(wei)了取得(de)一(yi)個(ge)(ge)比較確定(ding)(ding)的(de)(de)(de)(de)測(ce)(ce)量(liang)結(jie)果(guo)，通常對(dui)被(bei)測(ce)(ce)器件規定(ding)(ding)一(yi)個(ge)(ge)特定(ding)(ding)的(de)(de)(de)(de)測(ce)(ce)量(liang)時(shi)(shi)間(jian)(jian)（如(ru)電(dian)(dian)(dian)(dian)線電(dian)(dian)(dian)(dian)纜規定(ding)(ding)為(wei)1分(fen)鐘(zhong)），可(ke)以通過設置(zhi)儀器的(de)(de)(de)(de)定(ding)(ding)時(shi)(shi)器獲得(de)所需的(de)(de)(de)(de)定(ding)(ding)時(shi)(shi)時(shi)(shi)間(jian)(jian)。

2、重復測(ce)量對(dui)測(ce)量結(jie)果(guo)的影(ying)響(xiang)

在測(ce)(ce)(ce)(ce)量(liang)電(dian)(dian)線(xian)電(dian)(dian)纜、大型(xing)電(dian)(dian)機、變(bian)壓器(qi)等大容量(liang)電(dian)(dian)器(qi)的(de)(de)(de)絕緣電(dian)(dian)阻時，如在短時間(jian)內(nei)進行(xing)重復(fu)測(ce)(ce)(ce)(ce)量(liang)，則(ze)二次(ci)測(ce)(ce)(ce)(ce)量(liang)示(shi)值將明顯比(bi)第(di)一(yi)(yi)次(ci)測(ce)(ce)(ce)(ce)量(liang)示(shi)值高，這是(shi)由(you)于被測(ce)(ce)(ce)(ce)器(qi)件中存(cun)在第(di)一(yi)(yi)次(ci)測(ce)(ce)(ce)(ce)量(liang)所施加的(de)(de)(de)殘(can)余電(dian)(dian)荷的(de)(de)(de)緣故。這些器(qi)件充電(dian)(dian)時間(jian)很長，同(tong)樣，放(fang)電(dian)(dian)時間(jian)也很長，在沒(mei)有(you)充分放(fang)電(dian)(dian)的(de)(de)(de)情況下重復(fu)測(ce)(ce)(ce)(ce)量(liang)，充電(dian)(dian)效果是(shi)疊加的(de)(de)(de)，其等效作用是(shi)延長了后(hou)一(yi)(yi)次(ci)測(ce)(ce)(ce)(ce)量(liang)實(shi)際上的(de)(de)(de)測(ce)(ce)(ce)(ce)量(liang)時間(jian)，電(dian)(dian)阻示(shi)值自然較高。因此，北京檢(jian)測(ce)(ce)(ce)(ce)儀器(qi)測(ce)(ce)(ce)(ce)量(liang)結果應(ying)以第(di)一(yi)(yi)次(ci)測(ce)(ce)(ce)(ce)量(liang)為(wei)準，如要進行(xing)第(di)二次(ci)測(ce)(ce)(ce)(ce)量(liang)則(ze)必須對被測(ce)(ce)(ce)(ce)器(qi)件進行(xing)充分放(fang)電(dian)(dian)后(hou)（一(yi)(yi)般為(wei)數十分鐘至(zhi)數小時）才(cai)能進行(xing)。