恒電位儀介紹
2014-09-12
[2497]
恒電位儀定義
恒(heng)(heng)電(dian)位(wei)(wei)(wei)(wei)儀之(zhi)所以稱為(wei)(wei)恒(heng)(heng)電(dian)位(wei)(wei)(wei)(wei)儀是因為(wei)(wei)只要儀器的(de)(de)放大倍(bei)數計(ji)算(suan)設計(ji)得正確，取(qu)樣信號(hao)特(te)性與(yu)儀器輸入輸出特(te)性有(you)足(zu)夠的(de)(de)線(xian)性一(yi)(yi)致(zhi)，并且調整(zheng)良好，恒(heng)(heng)電(dian)位(wei)(wei)(wei)(wei)儀在額定(ding)(ding)工作范圍內可使被保護物通電(dian)點的(de)(de)電(dian)位(wei)(wei)(wei)(wei)與(yu)設定(ding)(ding)的(de)(de)控制電(dian)位(wei)(wei)(wei)(wei)一(yi)(yi)致(zhi)，誤差一(yi)(yi)般在5mV以下(xia)。恒(heng)(heng)電(dian)位(wei)(wei)(wei)(wei)儀本身(shen)就是一(yi)(yi)臺整(zheng)流(liu)器下(xia)的(de)(de)一(yi)(yi)個分支，具有(you)恒(heng)(heng)電(dian)位(wei)(wei)(wei)(wei)，恒(heng)(heng)電(dian)流(liu)功(gong)能。
恒電(dian)位(wei)儀接線程(cheng)序
恒(heng)(heng)電(dian)位(wei)(wei)(wei)(wei)儀之(zhi)所以稱為(wei)(wei)恒(heng)(heng)電(dian)位(wei)(wei)(wei)(wei)儀是因為(wei)(wei)只要儀器的(de)(de)放大倍(bei)數計(ji)算(suan)設計(ji)得正確，取(qu)樣信號(hao)特(te)性與(yu)儀器輸入輸出特(te)性有(you)足(zu)夠的(de)(de)線(xian)性一(yi)(yi)致(zhi)，并且調整(zheng)良好，恒(heng)(heng)電(dian)位(wei)(wei)(wei)(wei)儀在額定(ding)(ding)工作范圍內可使被保護物通電(dian)點的(de)(de)電(dian)位(wei)(wei)(wei)(wei)與(yu)設定(ding)(ding)的(de)(de)控制電(dian)位(wei)(wei)(wei)(wei)一(yi)(yi)致(zhi)，誤差一(yi)(yi)般在5mV以下(xia)。恒(heng)(heng)電(dian)位(wei)(wei)(wei)(wei)儀本身(shen)就是一(yi)(yi)臺整(zheng)流(liu)器下(xia)的(de)(de)一(yi)(yi)個分支，具有(you)恒(heng)(heng)電(dian)位(wei)(wei)(wei)(wei)，恒(heng)(heng)電(dian)流(liu)功(gong)能。
恒電(dian)位(wei)儀接線程(cheng)序
恒(heng)(heng)電(dian)(dian)(dian)(dian)(dian)位(wei)儀(yi)(yi)的接(jie)(jie)線不(bu)復雜，一般由4條電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)組成（不(bu)考慮(lv)誤差(cha)、故障報警等附屬電(dian)(dian)(dian)(dian)(dian)路(lu)可引出(chu)(chu)的信(xin)號接(jie)(jie)線），分別(bie)接(jie)(jie)于(yu)：輸(shu)(shu)出(chu)(chu)陰(yin)(yin)極(ji)、輸(shu)(shu)出(chu)(chu)陽(yang)極(ji)、零(ling)(ling)位(wei)接(jie)(jie)陰(yin)(yin)、參(can)(can)比電(dian)(dian)(dian)(dian)(dian)極(ji)。輸(shu)(shu)出(chu)(chu)陰(yin)(yin)極(ji)是恒(heng)(heng)電(dian)(dian)(dian)(dian)(dian)位(wei)儀(yi)(yi)輸(shu)(shu)出(chu)(chu)的負(fu)端子，接(jie)(jie)至被保護(hu)物的通(tong)電(dian)(dian)(dian)(dian)(dian)點，輸(shu)(shu)出(chu)(chu)陽(yang)極(ji)是恒(heng)(heng)電(dian)(dian)(dian)(dian)(dian)位(wei)儀(yi)(yi)的正端子，接(jie)(jie)至輔助陽(yang)極(ji)（地床或深井陽(yang)極(ji)）；零(ling)(ling)位(wei)接(jie)(jie)陰(yin)(yin)是儀(yi)(yi)器電(dian)(dian)(dian)(dian)(dian)路(lu)的地端，接(jie)(jie)于(yu)被保護(hu)物通(tong)電(dian)(dian)(dian)(dian)(dian)點附近(jin)，參(can)(can)比電(dian)(dian)(dian)(dian)(dian)極(ji)即取樣(yang)信(xin)號輸(shu)(shu)入端，接(jie)(jie)埋設在通(tong)電(dian)(dian)(dian)(dian)(dian)點附近(jin)的參(can)(can)比電(dian)(dian)(dian)(dian)(dian)極(ji)。輸(shu)(shu)出(chu)(chu)陰(yin)(yin)極(ji)和輸(shu)(shu)出(chu)(chu)陽(yang)極(ji)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)要有足夠的截面(mian)積，一般不(bu)應(ying)小于(yu)10 mm2；零(ling)(ling)位(wei)接(jie)(jie)陰(yin)(yin)和參(can)(can)比電(dian)(dian)(dian)(dian)(dian)極(ji)對(dui)電(dian)(dian)(dian)(dian)(dian)纜(lan)(lan)截面(mian)無要求，只考慮(lv)足夠強度即可。恒(heng)(heng)電(dian)(dian)(dian)(dian)(dian)位(wei)儀(yi)(yi)的接(jie)(jie)線都應(ying)該是銅(tong)線，遠端并應(ying)焊接(jie)(jie)。
值得說明(ming)的是(shi)零位(wei)(wei)接(jie)(jie)陰是(shi)接(jie)(jie)于通(tong)電(dian)點(dian)(dian)幾乎同(tong)一(yi)(yi)點(dian)(dian)（以電(dian)的概念(nian)解釋(shi)就是(shi)同(tong)一(yi)(yi)點(dian)(dian)，施工時應該(gai)離開(kai)50～100mm，避(bi)開(kai)電(dian)流涌入），但是(shi)必(bi)須(xu)用(yong)單獨接(jie)(jie)線，因為零位(wei)(wei)接(jie)(jie)陰是(shi)整(zheng)個儀器電(dian)路的地，這個“地”必(bi)須(xu)建立在被保(bao)護(hu)物(wu)（管道(dao)）上，才能實(shi)現正確控制(zhi)，因此絕(jue)不能使用(yong)短線把零位(wei)(wei)接(jie)(jie)陰與輸(shu)出陰極接(jie)(jie)在一(yi)(yi)起，雖然那按電(dian)的概念(nian)也是(shi)同(tong)一(yi)(yi)點(dian)(dian)。
zui后說明(ming)一下(xia)，恒(heng)電(dian)位儀是電(dian)化學研究(jiu)、應(ying)用(yong)方(fang)面(mian)(mian)的(de)重要儀器，有很多(duo)種類，上面(mian)(mian)說的(de)是用(yong)于陰極保護的(de)恒(heng)電(dian)位儀的(de)基本方(fang)面(mian)(mian)。
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