電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)是根據通(tong)(tong)電(dian)(dian)(dian)(dian)(dian)導體在磁(ci)(ci)(ci)(ci)(ci)(ci)場(chang)(chang)中(zhong)受磁(ci)(ci)(ci)(ci)(ci)(ci)場(chang)(chang)力的作用(yong)而制成(cheng)的。電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)內(nei)部有(you)一(yi)永磁(ci)(ci)(ci)(ci)(ci)(ci)體，在極間產生(sheng)磁(ci)(ci)(ci)(ci)(ci)(ci)場(chang)(chang)，在磁(ci)(ci)(ci)(ci)(ci)(ci)場(chang)(chang)中(zhong)有(you)一(yi)個(ge)線圈(quan)，線圈(quan)兩(liang)端各有(you)一(yi)個(ge)游(you)絲(si)彈簧(huang)，彈簧(huang)各連(lian)接(jie)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)的一(yi)個(ge)接(jie)線柱(zhu)，在彈簧(huang)與線圈(quan)間由一(yi)個(ge)轉(zhuan)軸連(lian)接(jie)，正(zheng)泰電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)，在轉(zhuan)軸相對于電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)的前(qian)端，有(you)一(yi)個(ge)指(zhi)針。指(zhi)針偏(pian)(pian)轉(zhuan)。由于磁(ci)(ci)(ci)(ci)(ci)(ci)場(chang)(chang)力的大(da)(da)小隨電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)增大(da)(da)而增大(da)(da)，所以(yi)就可以(yi)通(tong)(tong)過(guo)指(zhi)針的偏(pian)(pian)轉(zhuan)程度來觀(guan)察電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的大(da)(da)小。一(yi)般可直(zhi)接(jie)測(ce)量(liang)微安或毫安數量(liang)級的電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，為測(ce)更(geng)大(da)(da)的電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)應有(you)并聯電(dian)(dian)(dian)(dian)(dian)阻器(qi)（又(you)稱分流(liu)(liu)(liu)器(qi)）。主要采用(yong)磁(ci)(ci)(ci)(ci)(ci)(ci)電(dian)(dian)(dian)(dian)(dian)系電(dian)(dian)(dian)(dian)(dian)表(biao)的測(ce)量(liang)機構。分流(liu)(liu)(liu)器(qi)的電(dian)(dian)(dian)(dian)(dian)阻值(zhi)要使滿(man)量(liang)程電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)通(tong)(tong)過(guo)時(shi)，電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)滿(man)偏(pian)(pian)轉(zhuan)，即電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)指(zhi)示達到醉大(da)(da)。

交流(liu)(liu)(liu)電(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)主要(yao)采用(yong)電(dian)(dian)(dian)磁系(xi)(xi)電(dian)(dian)(dian)表(biao)(biao)、電(dian)(dian)(dian)動(dong)系(xi)(xi)電(dian)(dian)(dian)表(biao)(biao)和整流(liu)(liu)(liu)式(shi)電(dian)(dian)(dian)表(biao)(biao)的測(ce)量(liang)(liang)機(ji)構(gou)(gou)。電(dian)(dian)(dian)磁系(xi)(xi)測(ce)量(liang)(liang)機(ji)構(gou)(gou)的醉低(di)量(liang)(liang)程約為幾十毫安，為提高量(liang)(liang)程，正泰電(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)報價，要(yao)按比(bi)例減少線(xian)圈(quan)(quan)匝(za)數(shu)，并(bing)加(jia)粗(cu)(cu)導線(xian)。用(yong)電(dian)(dian)(dian)動(dong)系(xi)(xi)測(ce)量(liang)(liang)機(ji)構(gou)(gou)構(gou)(gou)成電(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)時，動(dong)圈(quan)(quan)與靜圈(quan)(quan)并(bing)聯，其醉低(di)量(liang)(liang)程約為幾十毫安。為提高量(liang)(liang)程，正泰電(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)哪家(jia)好，要(yao)減少靜圈(quan)(quan)匝(za)數(shu)，并(bing)加(jia)粗(cu)(cu)導線(xian)，或將(jiang)兩個靜圈(quan)(quan)由(you)串聯改為并(bing)聯，則電(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)的量(liang)(liang)程將(jiang)增大(da)一(yi)倍。

交(jiao)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)可(ke)采用(yong)電(dian)(dian)(dian)(dian)磁系(xi)(xi)或(huo)電(dian)(dian)(dian)(dian)動系(xi)(xi)測量機(ji)構(gou)(gou)。為(wei)使磁電(dian)(dian)(dian)(dian)系(xi)(xi)測量機(ji)構(gou)(gou)也能用(yong)于測量交(jiao)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，可(ke)利(li)用(yong)整流(liu)(liu)(liu)器(qi)或(huo)熱(re)電(dian)(dian)(dian)(dian)偶等器(qi)件先(xian)將交(jiao)流(liu)(liu)(liu)轉換為(wei)直流(liu)(liu)(liu);由(you)它(ta)們(men)組合而成(cheng)的電(dian)(dian)(dian)(dian)表(biao)(biao)分別稱(cheng)為(wei)整流(liu)(liu)(liu)式(shi)(shi)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)(見整流(liu)(liu)(liu)式(shi)(shi)電(dian)(dian)(dian)(dian)表(biao)(biao))、熱(re)電(dian)(dian)(dian)(dian)式(shi)(shi)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)。為(wei)擴大(da)量程以測量大(da)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)，整流(liu)(liu)(liu)式(shi)(shi)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)也采用(yong)分流(liu)(liu)(liu)器(qi);電(dian)(dian)(dian)(dian)動系(xi)(xi)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)的做法(fa)同前(qian);電(dian)(dian)(dian)(dian)磁系(xi)(xi)電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)則(ze)是加(jia)粗線(xian)圈(quan)導線(xian)、減(jian)少匝數。對于更大(da)的測量電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)值需配合電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)互感器(qi)使用(yong)。通(tong)常可(ke)利(li)用(yong)分流(liu)(liu)(liu)器(qi)和交(jiao)流(liu)(liu)(liu)數字電(dian)(dian)(dian)(dian)壓表(biao)(biao)構(gou)(gou)成(cheng)交(jiao)流(liu)(liu)(liu)數字電(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)(biao)。