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萬用表不僅可以用來測量被測量物體的電阻，
萬(wan)用(yong)(yong)(yong)(yong)(yong)表(biao)(biao)(圖1)交直(zhi)(zhi)流(liu)電壓(ya)還(huan)可以(yi)(yi)測(ce)(ce)(ce)量(liang)(liang)(liang)直(zhi)(zhi)流(liu)電壓(ya)。甚(shen)至有的(de)(de)(de)(de)(de)萬(wan)用(yong)(yong)(yong)(yong)(yong)表(biao)(biao)還(huan)可以(yi)(yi)測(ce)(ce)(ce)量(liang)(liang)(liang)晶(jing)體(ti)管的(de)(de)(de)(de)(de)主要參數(shu)以(yi)(yi)及電容器的(de)(de)(de)(de)(de)電容量(liang)(liang)(liang)等。充(chong)分(fen)熟練掌握萬(wan)用(yong)(yong)(yong)(yong)(yong)表(biao)(biao)的(de)(de)(de)(de)(de)使用(yong)(yong)(yong)(yong)(yong)方(fang)法是電子技術的(de)(de)(de)(de)(de)最基(ji)本(ben)技能之(zhi)一。常見(jian)的(de)(de)(de)(de)(de)萬(wan)用(yong)(yong)(yong)(yong)(yong)表(biao)(biao)有指(zhi)針(zhen)式(shi)萬(wan)用(yong)(yong)(yong)(yong)(yong)表(biao)(biao)和數(shu)字式(shi)萬(wan)用(yong)(yong)(yong)(yong)(yong)表(biao)(biao)。指(zhi)針(zhen)式(shi)多用(yong)(yong)(yong)(yong)(yong)表(biao)(biao)是以(yi)(yi)表(biao)(biao)頭(tou)為(wei)核心部(bu)件的(de)(de)(de)(de)(de)多功(gong)能測(ce)(ce)(ce)量(liang)(liang)(liang)儀表(biao)(biao)，測(ce)(ce)(ce)量(liang)(liang)(liang)值由表(biao)(biao)頭(tou)指(zhi)針(zhen)指(zhi)示(shi)讀(du)取。數(shu)字式(shi)萬(wan)用(yong)(yong)(yong)(yong)(yong)表(biao)(biao)的(de)(de)(de)(de)(de)測(ce)(ce)(ce)量(liang)(liang)(liang)值由液晶(jing)顯示(shi)屏直(zhi)(zhi)接以(yi)(yi)數(shu)字的(de)(de)(de)(de)(de)形式(shi)顯示(shi)，讀(du)取方(fang)便，有些(xie)還(huan)帶有語音提示(shi)功(gong)能。萬(wan)用(yong)(yong)(yong)(yong)(yong)表(biao)(biao)是公用(yong)(yong)(yong)(yong)(yong)一個表(biao)(biao)頭(tou)，集電壓(ya)表(biao)(biao)、電流(liu)表(biao)(biao)和歐姆表(biao)(biao)于(yu)一體(ti)的(de)(de)(de)(de)(de)儀表(biao)(biao)。
萬(wan)(wan)用(yong)表的(de)直(zhi)流(liu)(liu)電流(liu)(liu)檔是多(duo)量(liang)(liang)(liang)程(cheng)(cheng)的(de)直(zhi)流(liu)(liu)電壓(ya)表。表頭(tou)并聯(lian)閉路式分(fen)壓(ya)電阻即可(ke)擴大(da)其(qi)電壓(ya)量(liang)(liang)(liang)程(cheng)(cheng)。萬(wan)(wan)用(yong)表的(de)直(zhi)流(liu)(liu)電壓(ya)檔是多(duo)量(liang)(liang)(liang)程(cheng)(cheng)的(de)直(zhi)流(liu)(liu)電壓(ya)表。表頭(tou)串聯(lian)分(fen)壓(ya)電阻即可(ke)擴大(da)其(qi)電壓(ya)量(liang)(liang)(liang)程(cheng)(cheng)。分(fen)壓(ya)電阻不(bu)同，相應的(de)量(liang)(liang)(liang)程(cheng)(cheng)也(ye)不(bu)同。萬(wan)(wan)用(yong)表的(de)表頭(tou)為磁電系測量(liang)(liang)(liang)機構，它只能通(tong)過直(zhi)流(liu)(liu)，利(li)用(yong)二極管將交流(liu)(liu)變為直(zhi)流(liu)(liu)，從(cong)而實現交流(liu)(liu)電的(de)測量(liang)(liang)(liang)。
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