常見萬用表的使用和保養
萬用(yong)(yong)(yong)表(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)結構形式有(you)很多,面板上(shang)的(de)(de)(de)旋(xuan)(xuan)鈕(niu)、開關的(de)(de)(de)布(bu)局(ju)各(ge)(ge)異,因(yin)(yin)此在(zai)使(shi)(shi)(shi)用(yong)(yong)(yong)萬用(yong)(yong)(yong)表(biao)(biao)(biao)(biao)(biao)之(zhi)前,應(ying)仔細了(le)解和熟悉各(ge)(ge)部件的(de)(de)(de)作用(yong)(yong)(yong),同時也要(yao)分清盤(pan)上(shang)各(ge)(ge)條標(biao)度尺所對(dui)應(ying)的(de)(de)(de)測(ce)(ce)(ce)t的(de)(de)(de)t。要(yao)特(te)別注意萬用(yong)(yong)(yong)表(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)正(zheng)確使(shi)(shi)(shi)用(yong)(yong)(yong),因(yin)(yin)為萬用(yong)(yong)(yong)表(biao)(biao)(biao)(biao)(biao)的(de)(de)(de)故障(zhang)絕(jue)大部分是(shi)(shi)(shi)由于操作使(shi)(shi)(shi)用(yong)(yong)(yong)不(bu)當(dang)而(er)引(yin)起的(de)(de)(de).所以正(zheng)確使(shi)(shi)(shi)用(yong)(yong)(yong)萬用(yong)(yong)(yong)表(biao)(biao)(biao)(biao)(biao),實際上(shang)就是(shi)(shi)(shi)對(dui)萬用(yong)(yong)(yong)表(biao)(biao)(biao)(biao)(biao)最(zui)好的(de)(de)(de)維護。另(ling)外,也只有(you)正(zheng)確使(shi)(shi)(shi)用(yong)(yong)(yong)萬用(yong)(yong)(yong)表(biao)(biao)(biao)(biao)(biao).才(cai)能(neng)(neng)使(shi)(shi)(shi)測(ce)(ce)(ce)t誤差減小到(dao)最(zui)低程度。萬用(yong)(yong)(yong)表(biao)(biao)(biao)(biao)(biao)在(zai)使(shi)(shi)(shi)用(yong)(yong)(yong)之(zhi)前應(ying)水平放置,并檢查指(zhi)針(zhen)是(shi)(shi)(shi)否在(zai)零位,若不(bu)在(zai)零位,則(ze)應(ying)調整(zheng)萬用(yong)(yong)(yong)表(biao)(biao)(biao)(biao)(biao)中(zhong)間的(de)(de)(de)機械(xie)零位調節螺釘,使(shi)(shi)(shi)表(biao)(biao)(biao)(biao)(biao)針(zhen)指(zhi)向(xiang)零位。要(yao)將紅(hong)色(se)測(ce)(ce)(ce)試棒(bang)的(de)(de)(de)連接線接到(dao)紅(hong)色(se)接線柱或(huo)(huo)標(biao)有(you)“+”號的(de)(de)(de)插孔內,黑(hei)色(se)測(ce)(ce)(ce)試棒(bang)的(de)(de)(de)連接線接到(dao)黑(hei)色(se)接線柱或(huo)(huo)標(biao)有(you)“一’號的(de)(de)(de)插孔內。要(yao)根(gen)據測(ce)(ce)(ce)t的(de)(de)(de)對(dui)象(xiang)將轉換開關旋(xuan)(xuan)到(dao)孺(ru)要(yao)的(de)(de)(de)位置。例如,測(ce)(ce)(ce)t交流電壓時,應(ying)將轉換開關旋(xuan)(xuan)到(dao)相應(ying)區間上(shang)。有(you)的(de)(de)(de)萬用(yong)(yong)(yong)表(biao)(biao)(biao)(biao)(biao)盤(pan)上(shang)種(zhong)類(lei)選(xuan)擇旋(xuan)(xuan)鈕(niu)和t限(xian)變(bian)換旋(xuan)(xuan)鈕(niu)分設。使(shi)(shi)(shi)用(yong)(yong)(yong)時。應(ying)先將種(zhong)類(lei)選(xuan)擇旋(xuan)(xuan)鈕(niu)旋(xuan)(xuan)到(dao)對(dui)應(ying)被測(ce)(ce)(ce),所需的(de)(de)(de)檔位,然后再將t限(xian)變(bian)換旋(xuan)(xuan)鈕(niu)旋(xuan)(xuan)到(dao)相應(ying)檔位,適(shi)當(dang)的(de)(de)(de)t限(xian)。要(yao)特(te)別注意種(zhong)類(lei)的(de)(de)(de)選(xuan)擇,否則(ze)可能(neng)(neng)引(yin)起嚴(yan)重后果。
注意事項
(1)禁止(zhi)在雷電(dian)(dian)時(shi)或高壓設備(bei)附近測絕緣(yuan)電(dian)(dian)阻(zu),只能在設備(bei)不帶電(dian)(dian),也沒有(you)感應電(dian)(dian)的情況(kuang)下測量。
(2)搖測過程(cheng)中,被測設備上不能有(you)人(ren)工作。
(3)搖表(biao)線不能(neng)絞(jiao)在一起,要分開(kai)。
(4)搖表未停止轉動之前或被測設備未放(fang)電之前,嚴禁用手觸(chu)及。拆線(xian)時,也不要觸(chu)及引(yin)線(xian)的金(jin)屬部分。
(5)測量結束(shu)時,對于大電容設備要(yao)放電。
(6)要定(ding)期校驗其準(zhun)確(que)度。