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恒電位儀介紹

2014-09-12 [2446]
恒電位儀(yi)定義
    恒(heng)電(dian)位(wei)儀(yi)之所以稱為恒(heng)電(dian)位(wei)儀(yi)是(shi)因為只要儀(yi)器(qi)(qi)的(de)放大倍數計算(suan)設(she)計得正(zheng)確，取樣信號特性(xing)與儀(yi)器(qi)(qi)輸入輸出特性(xing)有足(zu)夠的(de)線性(xing)一(yi)(yi)(yi)致，并(bing)且調(diao)整良好，恒(heng)電(dian)位(wei)儀(yi)在(zai)(zai)額定工作(zuo)范圍內可使被保護物(wu)通電(dian)點的(de)電(dian)位(wei)與設(she)定的(de)控制電(dian)位(wei)一(yi)(yi)(yi)致，誤差(cha)一(yi)(yi)(yi)般在(zai)(zai)5mV以下(xia)。恒(heng)電(dian)位(wei)儀(yi)本身就是(shi)一(yi)(yi)(yi)臺整流器(qi)(qi)下(xia)的(de)一(yi)(yi)(yi)個分支(zhi)，具有恒(heng)電(dian)位(wei)，恒(heng)電(dian)流功能。
恒電位儀接線(xian)程序
    恒電(dian)(dian)(dian)(dian)(dian)位儀的接(jie)(jie)線不復雜(za)，一般由(you)4條電(dian)(dian)(dian)(dian)(dian)纜(lan)組成（不考慮(lv)誤(wu)差、故(gu)障報警等附(fu)屬(shu)電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)可引出的信號接(jie)(jie)線），分別接(jie)(jie)于：輸(shu)(shu)出陰極(ji)(ji)(ji)、輸(shu)(shu)出陽(yang)(yang)極(ji)(ji)(ji)、零(ling)位接(jie)(jie)陰、參(can)(can)比(bi)(bi)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)。輸(shu)(shu)出陰極(ji)(ji)(ji)是(shi)恒電(dian)(dian)(dian)(dian)(dian)位儀輸(shu)(shu)出的負端(duan)子，接(jie)(jie)至(zhi)被保(bao)護物的通(tong)電(dian)(dian)(dian)(dian)(dian)點(dian)，輸(shu)(shu)出陽(yang)(yang)極(ji)(ji)(ji)是(shi)恒電(dian)(dian)(dian)(dian)(dian)位儀的正端(duan)子，接(jie)(jie)至(zhi)輔助(zhu)陽(yang)(yang)極(ji)(ji)(ji)（地床或深井陽(yang)(yang)極(ji)(ji)(ji)）；零(ling)位接(jie)(jie)陰是(shi)儀器電(dian)(dian)(dian)(dian)(dian)路(lu)(lu)的地端(duan)，接(jie)(jie)于被保(bao)護物通(tong)電(dian)(dian)(dian)(dian)(dian)點(dian)附(fu)近，參(can)(can)比(bi)(bi)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)即取樣信號輸(shu)(shu)入端(duan)，接(jie)(jie)埋設在通(tong)電(dian)(dian)(dian)(dian)(dian)點(dian)附(fu)近的參(can)(can)比(bi)(bi)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)。輸(shu)(shu)出陰極(ji)(ji)(ji)和輸(shu)(shu)出陽(yang)(yang)極(ji)(ji)(ji)電(dian)(dian)(dian)(dian)(dian)纜(lan)要有足夠(gou)的截面積(ji)，一般不應(ying)小(xiao)于10 mm2；零(ling)位接(jie)(jie)陰和參(can)(can)比(bi)(bi)電(dian)(dian)(dian)(dian)(dian)極(ji)(ji)(ji)對電(dian)(dian)(dian)(dian)(dian)纜(lan)截面無要求，只考慮(lv)足夠(gou)強(qiang)度即可。恒電(dian)(dian)(dian)(dian)(dian)位儀的接(jie)(jie)線都應(ying)該是(shi)銅線，遠端(duan)并應(ying)焊接(jie)(jie)。
    值得說明(ming)的是零位(wei)(wei)接陰(yin)是接于(yu)通電(dian)(dian)點(dian)(dian)幾乎同一點(dian)(dian)（以電(dian)(dian)的概(gai)念解(jie)釋就是同一點(dian)(dian)，施工(gong)時(shi)應該(gai)離開50～100mm，避開電(dian)(dian)流涌入），但是必須用(yong)單獨接線，因為零位(wei)(wei)接陰(yin)是整個儀器電(dian)(dian)路的地，這個“地”必須建立在被保護(hu)物（管道）上，才能(neng)實現正(zheng)確控(kong)制，因此絕不能(neng)使用(yong)短線把零位(wei)(wei)接陰(yin)與輸(shu)出陰(yin)極(ji)接在一起，雖然那按電(dian)(dian)的概(gai)念也是同一點(dian)(dian)。
    zui后說明一下，恒(heng)電位儀(yi)是電化(hua)學研究、應(ying)用方(fang)面(mian)的(de)重(zhong)要儀(yi)器(qi)，有很多(duo)種類，上面(mian)說的(de)是用于陰極保護的(de)恒(heng)電位儀(yi)的(de)基本方(fang)面(mian)。