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万用表又称为复用表、多用表、三用表、繁用表等，是电力电子等部门不可缺少的测量仪表，一般以测量电压、电流和电阻为主要目的。万用表按显示方式分为指针万用表和数字万用表。是一种多功能、多量程的测量仪表，一般万用表可测量直流电流、直流电压、交流电流、交流电压、电阻和音频电平等，有的还可以测交流电流、电容量、电感量及半导体的一些参数(如β)等。万用表不仅可以用来测量被测量物体的电阻，交流电压还可以测量直流电压。甚至有的万用表还可以测量晶体管的主要参数以及电容器的电容量等。下面小编就举几个万用表的实例吧。 如何用万用表检测照明线路漏电故障 照明线路一旦出现漏电现象，不但浪费电能，而且还可能引起触电事故深圳市华联欧国际贸易有限公司专业供应如何用万用表检测线路故障、电动机转速和极数以及电缆断点？等系列产品,公司具有良好的市场信誉,专业的销售和采购服务团队,凭着多年经营经验,熟悉并了解市场行情,赢得了广大用户的青睐，致力于国内工控行业领军者!

万(wan)(wan)(wan)用(yong)(yong)(yong)(yong)表(biao)又(you)称为(wei)(wei)复(fu)用(yong)(yong)(yong)(yong)表(biao)、多(duo)用(yong)(yong)(yong)(yong)表(biao)、三用(yong)(yong)(yong)(yong)表(biao)、繁用(yong)(yong)(yong)(yong)表(biao)等，是电(dian)(dian)(dian)(dian)(dian)(dian)力电(dian)(dian)(dian)(dian)(dian)(dian)子等部(bu)门不可缺少的(de)(de)测(ce)(ce)(ce)量(liang)(liang)仪(yi)表(biao)，一般(ban)(ban)以(yi)(yi)测(ce)(ce)(ce)量(liang)(liang)电(dian)(dian)(dian)(dian)(dian)(dian)压(ya)、电(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)和电(dian)(dian)(dian)(dian)(dian)(dian)阻为(wei)(wei)主要(yao)目(mu)的(de)(de)。万(wan)(wan)(wan)用(yong)(yong)(yong)(yong)表(biao)按显(xian)示方式分为(wei)(wei)指针(zhen)万(wan)(wan)(wan)用(yong)(yong)(yong)(yong)表(biao)和数(shu)字万(wan)(wan)(wan)用(yong)(yong)(yong)(yong)表(biao)。是一种多(duo)功能、多(duo)量(liang)(liang)程的(de)(de)测(ce)(ce)(ce)量(liang)(liang)仪(yi)表(biao)，一般(ban)(ban)万(wan)(wan)(wan)用(yong)(yong)(yong)(yong)表(biao)可测(ce)(ce)(ce)量(liang)(liang)直流(liu)(liu)(liu)(liu)电(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)、直流(liu)(liu)(liu)(liu)电(dian)(dian)(dian)(dian)(dian)(dian)压(ya)、交流(liu)(liu)(liu)(liu)电(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)、交流(liu)(liu)(liu)(liu)电(dian)(dian)(dian)(dian)(dian)(dian)压(ya)、电(dian)(dian)(dian)(dian)(dian)(dian)阻和音频电(dian)(dian)(dian)(dian)(dian)(dian)平(ping)等，有(you)的(de)(de)还(hai)(hai)可以(yi)(yi)测(ce)(ce)(ce)交流(liu)(liu)(liu)(liu)电(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)(liu)、电(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)、电(dian)(dian)(dian)(dian)(dian)(dian)感(gan)量(liang)(liang)及半(ban)导(dao)体的(de)(de)一些参数(shu)(如β)等。万(wan)(wan)(wan)用(yong)(yong)(yong)(yong)表(biao)不仅可以(yi)(yi)用(yong)(yong)(yong)(yong)来测(ce)(ce)(ce)量(liang)(liang)被测(ce)(ce)(ce)量(liang)(liang)物体的(de)(de)电(dian)(dian)(dian)(dian)(dian)(dian)阻，交流(liu)(liu)(liu)(liu)电(dian)(dian)(dian)(dian)(dian)(dian)压(ya)还(hai)(hai)可以(yi)(yi)测(ce)(ce)(ce)量(liang)(liang)直流(liu)(liu)(liu)(liu)电(dian)(dian)(dian)(dian)(dian)(dian)压(ya)。甚至有(you)的(de)(de)万(wan)(wan)(wan)用(yong)(yong)(yong)(yong)表(biao)还(hai)(hai)可以(yi)(yi)测(ce)(ce)(ce)量(liang)(liang)晶体管的(de)(de)主要(yao)参数(shu)以(yi)(yi)及电(dian)(dian)(dian)(dian)(dian)(dian)容(rong)器(qi)的(de)(de)电(dian)(dian)(dian)(dian)(dian)(dian)容(rong)量(liang)(liang)等。下面(mian)小编就举(ju)几个万(wan)(wan)(wan)用(yong)(yong)(yong)(yong)表(biao)的(de)(de)实例吧。

如(ru)何(he)用万用表检(jian)测照明(ming)线路(lu)漏(lou)电故障

照明线(xian)路(lu)一旦出现漏(lou)电(dian)(dian)现象，不但(dan)浪费电(dian)(dian)能(neng)，而且(qie)还可(ke)能(neng)引起触(chu)电(dian)(dian)事故。漏(lou)电(dian)(dian)与(yu)短路(lu)的(de)本质相(xiang)同，只是(shi)(shi)事故发(fa)展程(cheng)度不同而已，严重的(de)漏(lou)电(dian)(dian)可(ke)能(neng)造成短路(lu)。因(yin)此，对(dui)照明线(xian)路(lu)的(de)漏(lou)电(dian)(dian)，切不可(ke)掉以(yi)轻心，应经常检查线(xian)路(lu)的(de)绝缘情况，尤(you)其是(shi)(shi)发(fa)现漏(lou)电(dian)(dian)现象时，应及时查明原因(yin)，找出故障点，并予(yu)以(yi)消除。

照明线路漏电的主(zhu)要原(yuan)因是(shi)：一是(shi)导(dao)(dao)线或电气设备的绝(jue)缘(yuan)受到外力损伤;二(er)是(shi)线路经长期运行，导(dao)(dao)致绝(jue)缘(yuan)老(lao)化变质;三是(shi)线路受潮气侵袭或被污染，造(zao)成绝(jue)缘(yuan)不良。

首(shou)先，判(pan)断是否确(que)实漏(lou)电。可(ke)用指针式万用表(biao)的R×10k档(dang)测(ce)测(ce)绝缘(yuan)电阻(zu)的大小，或(huo)数字万用表(biao)置于(yu)交流(liu)电流(liu)档(dang)(此时相当于(yu)一个电流(liu)表(biao))，串(chuan)联(lian)在(zai)总开关(guan)上，接通全部开关(guan)，取下所(suo)有(you)负载(包括灯(deng)泡)。若有(you)电流(liu)，则说明存(cun)在(zai)漏(lou)电现象(xiang)。确(que)定线路漏(lou)电后，可(ke)按以下步骤继续进(jin)行(xing)检查。

1、判断是(shi)相(xiang)线(xian)与零(ling)(ling)(ling)线(xian)间(jian)漏(lou)电(dian)(dian)(dian)，还是(shi)相(xiang)线(xian)与大地间(jian)漏(lou)电(dian)(dian)(dian)，或者二者兼(jian)而有之。方(fang)法(fa)是(shi)切断零(ling)(ling)(ling)线(xian)，若电(dian)(dian)(dian)流(liu)表指示(shi)不变，则(ze)是(shi)相(xiang)线(xian)与大地漏(lou)电(dian)(dian)(dian);若电(dian)(dian)(dian)流(liu)表指示(shi)为零(ling)(ling)(ling)，是(shi)相(xiang)线(xian)与零(ling)(ling)(ling)线(xian)间(jian)漏(lou)电(dian)(dian)(dian);电(dian)(dian)(dian)流(liu)表指示(shi)变小但不为零(ling)(ling)(ling)，则(ze)是(shi)相(xiang)线(xian)与零(ling)(ling)(ling)线(xian)、相(xiang)线(xian)与大地间(jian)均漏(lou)电(dian)(dian)(dian)。

2、确定(ding)漏(lou)(lou)电(dian)范围。取下(xia)分路(lu)熔断器(qi)或拉开(kai)断路(lu)器(qi)，若电(dian)流表指示不变，则(ze)(ze)说明(ming)总(zong)(zong)线(xian)漏(lou)(lou)电(dian);电(dian)流表指示为零(ling)，则(ze)(ze)为分路(lu)漏(lou)(lou)电(dian);电(dian)流表指示变小但不为零(ling)，则(ze)(ze)表明(ming)是总(zong)(zong)线(xian)、分路(lu)均有漏(lou)(lou)电(dian)。

3、找出(chu)漏电(dian)(dian)点(dian)。经上述检(jian)查(cha)，再依次(ci)断开该线(xian)路(lu)灯(deng)(deng)具(ju)的(de)开关，当断开某一(yi)开关时(shi)，电(dian)(dian)流表(biao)指示返零，则该分支(zhi)线(xian)漏电(dian)(dian);若变(bian)小则说(shuo)明这一(yi)分支(zhi)线(xian)漏电(dian)(dian)外，还有别处漏电(dian)(dian);若所有灯(deng)(deng)具(ju)开关断开后(hou)，电(dian)(dian)流表(biao)指示不变(bian)，则说(shuo)明该段干(gan)线(xian)漏电(dian)(dian)。依次(ci)把事(shi)故范围缩小，便可(ke)进一(yi)步(bu)检(jian)查(cha)该段线(xian)路(lu)的(de)接(jie)头(tou)、以(yi)及导线(xian)穿墙(qiang)处等地点(dian)是(shi)否漏电(dian)(dian)。找到漏电(dian)(dian)点(dian)后(hou)，应及时(shi)消除漏电(dian)(dian)故障(zhang)。负(fu)载端(duan)开始往前端(duan)一(yi)步(bu)步(bu)检(jian)测，查(cha)看(kan)工作是(shi)线(xian)路(lu)造成(cheng)还是(shi)元件造成(cheng)的(de)，就可(ke)以(yi)判断出(chu)来了(le)。排除短路(lu)故障(zhang)点(dian)后(hou),装接(jie)合(he)格的(de)熔丝再送电(dian)(dian)。

照明线(xian)路(lu)(lu)短路(lu)(lu)、开(kai)路(lu)(lu)、漏电(dian)是最常见的故障，只有(you)我(wo)们进行具(ju)体的测量和分析，才能准确地(di)找(zhao)出故障点，判明故障性质，并采取有(you)效措(cuo)施，使故障尽(jin)快消除。

如何用万用表判断电动机转速及(ji)转速

如果电动机没有铭牌，又(you)没有转速(su)表，在不拆开电动机的(de)情况下，可用万用表判断(duan)电动机的(de)转速(su)。

用(yong)万用(yong)表的(de)最小毫安档分别接上面已(yi)经判(pan)(pan)断(duan)出来的(de)某一个绕组(zu)的(de)首端和尾端，将转子慢(man)慢(man)匀(yun)速转动(dong)一圈，看万用(yong)表指针摆动(dong)几次，如(ru)果摆动(dong)一次，说明电流正、负变化一个周(zhou)期(qi)，可(ke)以(yi)判(pan)(pan)断(duan)它是(shi)2极电动(dong)机。同样理由(you)，摆动(dong)2次判(pan)(pan)断(duan)它是(shi)4极电动(dong)机，摆动(dong)3次判(pan)(pan)断(duan)它是(shi)6极电动(dong)机，依次类推。

判断(duan)出电动(dong)机的极(ji)(ji)数，就可(ke)知道它的大(da)致转(zhuan)速(su)(su)(略低(di)于同步转(zhuan)速(su)(su))。电动(dong)机的同步转(zhuan)速(su)(su)与磁极(ji)(ji)数的关(guan)系，在电源频率为50Hz时(shi)基本(ben)可(ke)以这样推(tui)算：二极(ji)(ji)为3000r/min，四极(ji)(ji)为1500r/min，六极(ji)(ji)为1000r/min。

在操作时，万用表(biao)表(biao)笔与端子要保持接触良好(hao)。否则，转动转子的过(guo)程中(zhong)表(biao)针均会(hui)摆动，判断不出结果。

如何用(yong)万用(yong)表查(cha)找电缆(lan)断点(dian)

当(dang)电缆(lan)或电缆(lan)的(de)(de)内(nei)部出现断线故障(zhang)时，由于外部绝缘皮的(de)(de)包裹，使断线的(de)(de)确(que)切位置不易确(que)定。用(yong)(yong)数(shu)字万用(yong)(yong)表可以将(jiang)这(zhei)一难(nan)题轻(qing)松搞定。

具体方法：把(ba)有断(duan)点的(de)(de)电(dian)(dian)(dian)线(xian)(xian)(电(dian)(dian)(dian)缆(lan))一端(duan)(duan)(duan)接在220V市(shi)电(dian)(dian)(dian)的(de)(de)火(huo)线(xian)(xian)上，另(ling)一端(duan)(duan)(duan)悬空。将(jiang)数字万用(yong)表拔至AC2V挡，从电(dian)(dian)(dian)线(xian)(xian)(电(dian)(dian)(dian)缆(lan))的(de)(de)火(huo)线(xian)(xian)接入(ru)端(duan)(duan)(duan)开始，用(yong)一只手捏(nie)住黑表笔(bi)(bi)的(de)(de)笔(bi)(bi)尖，另(ling)一只手将(jiang)红表笔(bi)(bi)沿(yan)导线(xian)(xian)的(de)(de)绝(jue)缘(yuan)皮(pi)慢(man)慢(man)移(yi)动，此(ci)时显示(shi)屏显示(shi)的(de)(de)电(dian)(dian)(dian)压(ya)(ya)(ya)值大(da)约(yue)(yue)为0.445V左右。当红表笔(bi)(bi)移(yi)动到某处时，显示(shi)屏显示(shi)的(de)(de)电(dian)(dian)(dian)压(ya)(ya)(ya)突然下降到0.0几(ji)伏(fu)(大(da)约(yue)(yue)是(shi)原来电(dian)(dian)(dian)压(ya)(ya)(ya)的(de)(de)十分之一)，从该位(wei)置向前(火(huo)线(xian)(xian)接入(ru)端(duan)(duan)(duan))的(de)(de)大(da)约(yue)(yue)15cm处即是(shi)电(dian)(dian)(dian)线(xian)(xian)(电(dian)(dian)(dian)缆(lan))断(duan)点所在。

用此(ci)法(fa)检(jian)查屏(ping)蔽(bi)线时(shi)，如果仅(jin)仅(jin)是芯线折断而屏(ping)蔽(bi)层没断，则此(ci)法(fa)是无能为力的(de)。

用这种方(fang)法还可(ke)以寻找故障电(dian)热毯等(deng)电(dian)阻丝的断路点

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