數字接地電阻測試儀是一種用來測量接地系統電阻的設備，它由于有著非常優秀的對接地電阻的測試能力，所以被廣泛使用在各類電力檢測環境。它可以實時監測接地系統的安全狀態，并對數據進行存儲和分析。今天小編就給大家來好好分析下數字式接地電阻測試儀的(de)工(gong)作原理(li)是什么(me)！一起來看看吧。

　　一、在看這個問題之前，我們先來了解下接地和接地電阻的概念：

　　1、接地(di)(di)是指將(jiang)電子(zi)設(she)備(bei)的(de)外(wai)殼(ke)或者(zhe)電路的(de)某一部(bu)分(fen)接入地(di)(di)面(mian)，使得它們與大地(di)(di)形成(cheng)低阻(zu)抗通路，以此降(jiang)低電壓差，從(cong)而防止(zhi)靜電累積、防雷擊等問題；

　　2、接(jie)地電(dian)阻是(shi)指接(jie)地體或自(zi)然(ran)接(jie)地體的(de)對地電(dian)阻，它(ta)代表著接(jie)地體向大地泄放電(dian)流(liu)的(de)能力。

　　二、數字式接地電阻測試儀的工作原理是什么？

　　數(shu)字接地(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)阻測(ce)(ce)試儀內部(bu)(bu)有(you)一個(ge)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)源(yuan)(yuan)和(he)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)源(yuan)(yuan)，當電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)源(yuan)(yuan)向(xiang)接地(di)(di)體施加一個(ge)固定(ding)的電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)時，電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)源(yuan)(yuan)會通過接地(di)(di)體向(xiang)大地(di)(di)注(zhu)入一個(ge)恒定(ding)的電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)。接地(di)(di)體的電(dian)(dian)(dian)(dian)(dian)(dian)位和(he)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)值會被(bei)數(shu)字接地(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)阻測(ce)(ce)試儀內部(bu)(bu)的電(dian)(dian)(dian)(dian)(dian)(dian)子元件測(ce)(ce)量(liang)并記錄下(xia)來。根據電(dian)(dian)(dian)(dian)(dian)(dian)位差法和(he)歐姆定(ding)律(lv)，可以(yi)計算出接地(di)(di)電(dian)(dian)(dian)(dian)(dian)(dian)阻的值。

　　重點：它其實是利用電(dian)(dian)流經過導體產生的磁場效應(ying)，利用磁通(tong)量的變化來測量接(jie)地(di)電(dian)(dian)阻。數字(zi)接(jie)地(di)電(dian)(dian)阻測試儀的工作(zuo)原(yuan)理是基于電(dian)(dian)位差(cha)法(fa)。

　　好的數(shu)字接地(di)電(dian)阻測試(shi)儀可以在(zai)不同的環境(jing)下(xia)使用。因為它不受環境(jing)因素的影(ying)響，所以能夠(gou)在(zai)潮濕、寒冷、高(gao)溫等極(ji)端環境(jing)中進行(xing)準(zhun)確測量。

　　三、數字式接地電阻測試儀的測量原理是什么？

　　數字接地(di)電(dian)(dian)(dian)(dian)阻測試(shi)儀(yi)的(de)(de)測量原理是(shi)基于(yu)電(dian)(dian)(dian)(dian)橋(qiao)(qiao)(qiao)(qiao)(qiao)平(ping)衡原理。電(dian)(dian)(dian)(dian)橋(qiao)(qiao)(qiao)(qiao)(qiao)平(ping)衡原理是(shi)指(zhi)在一個平(ping)衡電(dian)(dian)(dian)(dian)橋(qiao)(qiao)(qiao)(qiao)(qiao)中(zhong)，當兩(liang)個橋(qiao)(qiao)(qiao)(qiao)(qiao)臂的(de)(de)電(dian)(dian)(dian)(dian)阻值相同(tong)時(shi)，電(dian)(dian)(dian)(dian)橋(qiao)(qiao)(qiao)(qiao)(qiao)的(de)(de)輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓為(wei)零(ling)。數字接地(di)電(dian)(dian)(dian)(dian)阻測試(shi)儀(yi)內部有(you)一個平(ping)衡電(dian)(dian)(dian)(dian)橋(qiao)(qiao)(qiao)(qiao)(qiao)，當接地(di)體的(de)(de)電(dian)(dian)(dian)(dian)阻值未知時(shi)，電(dian)(dian)(dian)(dian)橋(qiao)(qiao)(qiao)(qiao)(qiao)的(de)(de)輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓不為(wei)零(ling)。通過調整電(dian)(dian)(dian)(dian)橋(qiao)(qiao)(qiao)(qiao)(qiao)的(de)(de)橋(qiao)(qiao)(qiao)(qiao)(qiao)臂電(dian)(dian)(dian)(dian)阻值，可以(yi)使電(dian)(dian)(dian)(dian)橋(qiao)(qiao)(qiao)(qiao)(qiao)達(da)到(dao)平(ping)衡狀態，此時(shi)電(dian)(dian)(dian)(dian)橋(qiao)(qiao)(qiao)(qiao)(qiao)的(de)(de)輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓與接地(di)電(dian)(dian)(dian)(dian)阻的(de)(de)值成(cheng)比(bi)例關(guan)系。數字接地(di)電(dian)(dian)(dian)(dian)阻測試(shi)儀(yi)通過測量電(dian)(dian)(dian)(dian)橋(qiao)(qiao)(qiao)(qiao)(qiao)的(de)(de)輸(shu)出(chu)電(dian)(dian)(dian)(dian)壓，可以(yi)計算出(chu)接地(di)電(dian)(dian)(dian)(dian)阻的(de)(de)值。