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直流(liu)電阻測(ce)試(shi)儀(yi)在(zai)測(ce)量(liang)(liang)(liang)過程(cheng)中，除要嚴(yan)格(ge)遵守電氣(qi)安全(quan)(quan)規(gui)程(cheng)和設(she)備(bei)試(shi)驗規(gui)程(cheng)外，還要特別(bie)注意，在(zai)線(xian)圈(quan)溫度(du)穩定(ding)的(de)(de)情況下(xia)進行測(ce)量(liang)(liang)(liang)，要求變壓(ya)器油箱上、下(xia)部的(de)(de)溫度(du)之(zhi)差不(bu)(bu)超過３℃。由于變壓(ya)器線(xian)圈(quan)存有電感，測(ce)量(liang)(liang)(liang)時的(de)(de)充(chong)(chong)電電流(liu)不(bu)(bu)太穩定(ding)，一(yi)定(ding)要在(zai)電流(liu)穩定(ding)后再計數，必要時需采取縮短充(chong)(chong)電時間的(de)(de)措(cuo)施。盡量(liang)(liang)(liang)減少(shao)試(shi)驗回路中的(de)(de)導(dao)線(xian)接觸電阻，運行中的(de)(de)變壓(ya)器分接頭(tou)常(chang)受油膜等(deng)污物的(de)(de)影響(xiang)使其(qi)接觸不(bu)(bu)良，一(yi)般需切換數次后再測(ce)量(liang)(liang)(liang)，以免造成判別(bie)錯誤。測(ce)量(liang)(liang)(liang)變壓(ya)器低壓(ya)側時，所有人員應與高壓(ya)側保持適(shi)當安全(quan)(quan)距離。
直(zhi)流(liu)電(dian)(dian)(dian)(dian)阻(zu)測(ce)試儀(yi)在運輸、儲存(cun)及工作中(zhong)應(ying)(ying)避(bi)免強烈震動、陽光(guang)直(zhi)射(she)和磁場(chang)的(de)(de)影(ying)響，存(cun)放保管儀(yi)器(qi)時(shi)，應(ying)(ying)注意環境溫度和濕度，應(ying)(ying)放在干燥、通風(feng)、無(wu)腐蝕氣(qi)體的(de)(de)地方為宜(yi)，不得受潮、雨淋、暴(bao)曬，使用(yong)時(shi)輕拿、輕放，不得跌落。可以檢查(cha)出設備的(de)(de)導電(dian)(dian)(dian)(dian)回路有無(wu)接觸不良、焊接不良、線(xian)圈故障及接線(xian)錯誤等缺陷。在中(zhong)、小型變壓器(qi)的(de)(de)實(shi)際測(ce)量(liang)中(zhong)，大多(duo)采用(yong)直(zhi)流(liu)電(dian)(dian)(dian)(dian)橋(qiao)(qiao)法(fa)，當被試線(xian)圈的(de)(de)電(dian)(dian)(dian)(dian)阻(zu)值在1歐以上的(de)(de)一般用(yong)單(dan)臂電(dian)(dian)(dian)(dian)橋(qiao)(qiao)測(ce)量(liang)，1歐以下的(de)(de)則(ze)用(yong)雙(shuang)臂電(dian)(dian)(dian)(dian)橋(qiao)(qiao)測(ce)量(liang)。在使用(yong)雙(shuang)臂電(dian)(dian)(dian)(dian)橋(qiao)(qiao)接線(xian)時(shi)，電(dian)(dian)(dian)(dian)橋(qiao)(qiao)的(de)(de)電(dian)(dian)(dian)(dian)位樁頭(tou)(tou)要靠近(jin)被測(ce)電(dian)(dian)(dian)(dian)阻(zu)，電(dian)(dian)(dian)(dian)流(liu)樁頭(tou)(tou)要接在電(dian)(dian)(dian)(dian)位樁頭(tou)(tou)的(de)(de)上面。
直流(liu)(liu)(liu)電(dian)(dian)阻(zu)測試儀測量(liang)前，應先(xian)估(gu)計(ji)(ji)被(bei)測線(xian)(xian)圈的電(dian)(dian)阻(zu)值(zhi)，將電(dian)(dian)橋(qiao)倍(bei)率選鈕(niu)置于適(shi)當位置，將非被(bei)測線(xian)(xian)圈短路并接(jie)地，然后(hou)打開電(dian)(dian)源開關(guan)充電(dian)(dian)，待(dai)充足電(dian)(dian)后(hou)按下檢(jian)流(liu)(liu)(liu)計(ji)(ji)開關(guan)，迅(xun)速(su)調節(jie)測量(liang)臂，使檢(jian)流(liu)(liu)(liu)計(ji)(ji)指針向檢(jian)流(liu)(liu)(liu)計(ji)(ji)刻度中(zhong)間的零位線(xian)(xian)方向移(yi)動，進行微調，待(dai)指針平穩停(ting)在零位上時(shi)記錄(lu)電(dian)(dian)阻(zu)值(zhi)，此時(shi)，被(bei)測線(xian)(xian)圈電(dian)(dian)阻(zu)值(zhi)＝倍(bei)率數×測量(liang)臂電(dian)(dian)阻(zu)值(zhi)。測量(liang)完畢(bi)，先(xian)開放(fang)檢(jian)流(liu)(liu)(liu)計(ji)(ji)按鈕(niu)，再(zai)放(fang)開電(dian)(dian)源開關(guan)。
直流電(dian)阻(zu)測(ce)試儀測(ce)量(liang)前(qian)，應(ying)先(xian)估計(ji)(ji)被測(ce)線(xian)(xian)圈(quan)的(de)電(dian)阻(zu)值，將(jiang)電(dian)橋倍率選鈕(niu)(niu)置于適當位(wei)(wei)置，將(jiang)非(fei)被測(ce)線(xian)(xian)圈(quan)短路并接(jie)地，然后打開(kai)(kai)電(dian)源開(kai)(kai)關充電(dian)，待(dai)充足電(dian)后按(an)下(xia)檢(jian)(jian)(jian)(jian)流計(ji)(ji)開(kai)(kai)關，迅(xun)速(su)調節測(ce)量(liang)臂(bei)，使檢(jian)(jian)(jian)(jian)流計(ji)(ji)指針向(xiang)檢(jian)(jian)(jian)(jian)流計(ji)(ji)刻度中間(jian)的(de)零(ling)位(wei)(wei)線(xian)(xian)方向(xiang)移動(dong)，進行微(wei)調，待(dai)指針平穩(wen)停在零(ling)位(wei)(wei)上(shang)時記錄電(dian)阻(zu)值，此(ci)時，被測(ce)線(xian)(xian)圈(quan)電(dian)阻(zu)值＝倍率數×測(ce)量(liang)臂(bei)電(dian)阻(zu)值。測(ce)量(liang)完畢，先(xian)開(kai)(kai)放檢(jian)(jian)(jian)(jian)流計(ji)(ji)按(an)鈕(niu)(niu)，再放開(kai)(kai)電(dian)源開(kai)(kai)關。
