數字(zi)萬用(yong)表（Digital Multimeter，簡稱DMM）是(shi)(shi)一種用(yong)于測量電(dian)壓、電(dian)流和(he)電(dian)阻等(deng)電(dian)學(xue)參數的(de)便攜式儀器。無論是(shi)(shi)在電(dian)路(lu)設計、電(dian)子設備(bei)維修還是(shi)(shi)電(dian)子實驗(yan)中，數字(zi)萬用(yong)表都是(shi)(shi)必不可少的(de)工具(ju)。

總之，數字萬(wan)(wan)(wan)用(yong)表是(shi)一種功(gong)能強大、使用(yong)方(fang)便(bian)的電子(zi)測量儀器。它可以測量電壓、電流(liu)、電阻等電學(xue)參數，幫助我(wo)們進行電路測試和故障排除。數字萬(wan)(wan)(wan)用(yong)表在電子(zi)工(gong)(gong)程(cheng)(cheng)領域(yu)的應用(yong)非(fei)常廣(guang)的，是(shi)電子(zi)工(gong)(gong)程(cheng)(cheng)師、電工(gong)(gong)、電子(zi)愛好(hao)者和學(xue)生等必備的工(gong)(gong)具之一。無論是(shi)在實驗(yan)室、工(gong)(gong)廠還是(shi)家庭中，數字萬(wan)(wan)(wan)用(yong)表都發揮著重(zhong)要作用(yong)，為我(wo)們提供了準(zhun)確、可靠的電學(xue)測量結(jie)果。UT55標準(zhun)型數字萬(wan)(wan)(wan)用(yong)表具備多(duo)種測量功(gong)能。深圳UT54數字萬(wan)(wan)(wan)用(yong)表服務(wu)商

生活中可(ke)能與使用(yong)(yong)(yong)(yong)到萬(wan)用(yong)(yong)(yong)(yong)表(biao)，但是萬(wan)用(yong)(yong)(yong)(yong)表(biao)如何(he)使用(yong)(yong)(yong)(yong)卻不知道，不知道沒(mei)關(guan)系，不要(yao)著急，現在就來教(jiao)大家如何(he)解決。1.萬(wan)用(yong)(yong)(yong)(yong)表(biao)面板上主要(yao)由表(biao)頭、選(xuan)擇(ze)開關(guan)、歐姆檔調(diao)零旋(xuan)(xuan)鈕(niu)、表(biao)筆(bi)(bi)插孔。2.將(jiang)萬(wan)用(yong)(yong)(yong)(yong)表(biao)水(shui)平放(fang)置，檢查表(biao)針(zhen)是否停在表(biao)盤左端的(de)(de)(de)零，擇(ze)特(te)將(jiang)表(biao)筆(bi)(bi)按要(yao)求(qiu)(qiu)插入筆(bi)(bi)表(biao)插孔。3.再將(jiang)選(xuan)擇(ze)開關(guan)旋(xuan)(xuan)到相應的(de)(de)(de)項(xiang)目和(he)量(liang)(liang)程(cheng)上，并進行要(yao)求(qiu)(qiu)項(xiang)目的(de)(de)(de)測(ce)量(liang)(liang)，使用(yong)(yong)(yong)(yong)后將(jiang)選(xuan)擇(ze)艷盆開關(guan)旋(xuan)(xuan)至off檔。4.測(ce)量(liang)(liang)直流電(dian)(dian)壓的(de)(de)(de)步驟(zou)：根據電(dian)(dian)路中電(dian)(dian)源電(dian)(dian)壓大小選(xuan)擇(ze)量(liang)(liang)程(cheng)，然(ran)后將(jiang)萬(wan)用(yong)(yong)(yong)(yong)表(biao)與被測(ce)電(dian)(dian)路并聯，然(ran)后視線正對指針(zhen)讀數即可(ke)。湖北藍牙(ya)萬(wan)用(yong)(yong)(yong)(yong)表(biao)品牌我們的(de)(de)(de)數字萬(wan)用(yong)(yong)(yong)(yong)表(biao)可(ke)以滿足(zu)不同行業和(he)應用(yong)(yong)(yong)(yong)的(de)(de)(de)需求(qiu)(qiu)。

如(ru)(ru)何用(yong)(yong)數(shu)字(zi)萬用(yong)(yong)表(biao)(biao)(biao)(biao)(biao)測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)使(shi)用(yong)(yong)數(shu)字(zi)萬用(yong)(yong)表(biao)(biao)(biao)(biao)(biao)測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)時(shi),紅(hong)表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)為正表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi),插(cha)入(ru)(ru)“mA"插(cha)孔(kong)或者“A"插(cha)孔(kong),黑表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)為負表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi),插(cha)入(ru)(ru)“COM"插(cha)孔(kong),測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)選(xuan)擇開關旋轉到“直流(liu)(liu)(liu)A”檔(dang),傳入(ru)(ru)被(bei)測(ce)(ce)(ce)(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)即可(ke)測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)。測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)200mAI以(yi)下(xia)(xia)直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)時(shi),紅(hong)表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)應(ying)插(cha)入(ru)(ru)"mA"插(cha)孔(kong),測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)200mA及以(yi)上(shang)直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)時(shi),紅(hong)表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)應(ying)插(cha)入(ru)(ru)"A"插(cha)孔(kong)。例如(ru)(ru),測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)一個直流(liu)(liu)(liu)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)K的(de)(de)工作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu),首先如(ru)(ru)下(xia)(xia)圖所示(shi)(shi)斷開繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)K的(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)回路(lu),然后將(jiang)(jiang)正表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)接電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)池(chi)正極(ji),負表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)接繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi),如(ru)(ru)下(xia)(xia)圖所示(shi)(shi),液晶顯示(shi)(shi)的(de)(de)數(shu)字(zi)即為被(bei)測(ce)(ce)(ce)(ce)(ce)繼(ji)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)器(qi)的(de)(de)工作電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)。數(shu)字(zi)萬用(yong)(yong)表(biao)(biao)(biao)(biao)(biao)測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)過(guo)程中如(ru)(ru)果(guo)正、負表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)接扳,測(ce)(ce)(ce)(ce)(ce)結(jie)(jie)果(guo)將(jiang)(jiang)顯示(shi)(shi)為負值。用(yong)(yong)數(shu)字(zi)萬用(yong)(yong)表(biao)(biao)(biao)(biao)(biao)測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)時(shi),可(ke)以(yi)不必考慮電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)方向,這在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)方向不明確的(de)(de)情況下(xia)(xia)特別方便,同時(shi)測(ce)(ce)(ce)(ce)(ce)出(chu)了電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)方向和大(da)小。二、用(yong)(yong)指(zhi)(zhi)針(zhen)式萬表(biao)(biao)(biao)(biao)(biao)測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)時(shi),指(zhi)(zhi)針(zhen)式萬用(yong)(yong)表(biao)(biao)(biao)(biao)(biao)應(ying)串入(ru)(ru)被(bei)測(ce)(ce)(ce)(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu),如(ru)(ru)下(xia)(xia)圖所示(shi)(shi),既可(ke)以(yi)串入(ru)(ru)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源正極(ji)與被(bei)測(ce)(ce)(ce)(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)之間(jian)，也可(ke)以(yi)串入(ru)(ru)被(bei)測(ce)(ce)(ce)(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)與電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)源負極(ji)之間(jian)。測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)500mA及其以(yi)下(xia)(xia)直流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)時(shi),測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)選(xuan)擇開關應(ying)選(xuan)擇:mA檔(dang),測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)"500mA"檔(dang),并(bing)將(jiang)(jiang)正表(biao)(biao)(biao)(biao)(biao)筆(bi)(bi)(bi)插(cha)入(ru)(ru)"5A"插(cha)孔(kong)。測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)時(shi),指(zhi)(zhi)針(zhen)式萬用(yong)(yong)表(biao)(biao)(biao)(biao)(biao)的(de)(de)讀(du)數(shu)方法是(shi):滿度值(刻度線右邊(bian))等于所選(xuan)量(liang)(liang)(liang)(liang)程檔(dang)位數(shu),根據表(biao)(biao)(biao)(biao)(biao)針(zhen)指(zhi)(zhi)示(shi)(shi)位置折算出(chu)測(ce)(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)結(jie)(jie)果(guo)。歡(huan)迎來電(dian)(dian)(dian)(dian)(dian)(dian)(dian)(dian)咨詢！

數(shu)字萬用(yong)(yong)表(biao)的(de)(de)(de)主要“特長”萬用(yong)(yong)表(biao)我(wo)(wo)們又俗稱(cheng)“表(biao)”，它的(de)(de)(de)主要特長是綜(zong)合能力強(qiang)，好(hao)比“十八(ba)般武藝樣(yang)樣(yang)拿得起放得下”，不(bu)但可(ke)(ke)(ke)以測量(liang)(liang)交(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)流(liu)(liu)還可(ke)(ke)(ke)以測量(liang)(liang)交(jiao)流(liu)(liu)電(dian)(dian)(dian)(dian)壓、直流(liu)(liu)電(dian)(dian)(dian)(dian)流(liu)(liu)和電(dian)(dian)(dian)(dian)壓、電(dian)(dian)(dian)(dian)阻、電(dian)(dian)(dian)(dian)感(gan)、電(dian)(dian)(dian)(dian)容(rong)、音頻電(dian)(dian)(dian)(dian)平(ping)、二極(ji)管(guan)(guan)、晶(jing)(jing)體管(guan)(guan)放大(da)(da)(da)倍數(shu)、晶(jing)(jing)體管(guan)(guan)的(de)(de)(de)類型等等，況(kuang)且(qie)其(qi)(qi)測量(liang)(liang)準確要比鉗形電(dian)(dian)(dian)(dian)流(liu)(liu)表(biao)高(gao)出許多其(qi)(qi)精度可(ke)(ke)(ke)達0.1，尤其(qi)(qi)是數(shu)字萬用(yong)(yong)表(biao)。對于大(da)(da)(da)電(dian)(dian)(dian)(dian)流(liu)(liu)來(lai)說可(ke)(ke)(ke)以測量(liang)(liang)高(gao)達10A的(de)(de)(de)電(dian)(dian)(dian)(dian)流(liu)(liu)值，對于一般的(de)(de)(de)設(she)備足夠(gou)用(yong)(yong)了。我(wo)(wo)在維(wei)修(xiu)和調試設(she)備時(shi)十次(ci)我(wo)(wo)要有九次(ci)用(yong)(yong)到萬用(yong)(yong)表(biao)來(lai)完成任務。所以從(cong)使(shi)用(yong)(yong)頻率上說萬用(yong)(yong)表(biao)的(de)(de)(de)使(shi)用(yong)(yong)率要遠遠大(da)(da)(da)于鉗形電(dian)(dian)(dian)(dian)流(liu)(liu)表(biao)的(de)(de)(de)使(shi)用(yong)(yong)率，因此我(wo)(wo)更認為萬用(yong)(yong)表(biao)在維(wei)修(xiu)電(dian)(dian)(dian)(dian)器(qi)設(she)備時(shi)好(hao)用(yong)(yong)。數(shu)字萬用(yong)(yong)表(biao)的(de)(de)(de)阻抗測量(liang)(liang)功能可(ke)(ke)(ke)以幫助用(yong)(yong)戶檢測電(dian)(dian)(dian)(dian)路中的(de)(de)(de)電(dian)(dian)(dian)(dian)阻值。

多(duo)(duo)(duo)(duo)用(yong)(yong)(yong)表(biao)(biao)(biao)安全安全使(shi)(shi)(shi)用(yong)(yong)(yong)多(duo)(duo)(duo)(duo)用(yong)(yong)(yong)表(biao)(biao)(biao)首先要(yao)(yao)選擇(ze)適合應(ying)(ying)用(yong)(yong)(yong)、并滿足(zu)(zu)應(ying)(ying)用(yong)(yong)(yong)環境的(de)(de)(de)數字多(duo)(duo)(duo)(duo)用(yong)(yong)(yong)表(biao)(biao)(biao)。一旦(dan)選擇(ze)了合適的(de)(de)(de)多(duo)(duo)(duo)(duo)用(yong)(yong)(yong)表(biao)(biao)(biao)，你(ni)就要(yao)(yao)按(an)照正(zheng)常(chang)的(de)(de)(de)應(ying)(ying)用(yong)(yong)(yong)程序去(qu)使(shi)(shi)(shi)用(yong)(yong)(yong)它。國際電(dian)(dian)(dian)(dian)(dian)(dian)子電(dian)(dian)(dian)(dian)(dian)(dian)工協(xie)會(hui)為在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)力系(xi)統下工作制定了新標(biao)準(zhun)(zhun)。確認你(ni)正(zheng)在(zai)使(shi)(shi)(shi)用(yong)(yong)(yong)的(de)(de)(de)表(biao)(biao)(biao)滿足(zu)(zu)IEC的(de)(de)(de)標(biao)準(zhun)(zhun)，并且其(qi)額定電(dian)(dian)(dian)(dian)(dian)(dian)壓滿足(zu)(zu)現場(chang)應(ying)(ying)用(yong)(yong)(yong)要(yao)(yao)求。例如，如果測(ce)量(liang)480V的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)力盤，你(ni)的(de)(de)(de)表(biao)(biao)(biao)就要(yao)(yao)足(zu)(zu)CATⅢ_600V的(de)(de)(de)標(biao)準(zhun)(zhun)。這(zhe)(zhe)就意(yi)味(wei)(wei)著這(zhe)(zhe)塊(kuai)表(biao)(biao)(biao)的(de)(de)(de)輸(shu)入電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)被(bei)設(she)計為能(neng)夠承受(shou)在(zai)這(zhe)(zhe)種應(ying)(ying)用(yong)(yong)(yong)環境下的(de)(de)(de)瞬變而不(bu)會(hui)傷害使(shi)(shi)(shi)用(yong)(yong)(yong)者(zhe)。選擇(ze)標(biao)有(you)UL，CSA，CDE，TUV的(de)(de)(de)表(biao)(biao)(biao)，意(yi)味(wei)(wei)著這(zhe)(zhe)塊(kuai)表(biao)(biao)(biao)不(bu)僅(jin)滿足(zu)(zu)IEC標(biao)準(zhun)(zhun)，還經過(guo)(guo)認證測(ce)試，并滿足(zu)(zu)測(ce)試機構的(de)(de)(de)自(zi)(zi)己(ji)標(biao)準(zhun)(zhun)。導致數字多(duo)(duo)(duo)(duo)用(yong)(yong)(yong)表(biao)(biao)(biao)損壞的(de)(de)(de)常(chang)見(jian)原(yuan)因1、當探(tan)(tan)頭還在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)插孔中(zhong)時，用(yong)(yong)(yong)其(qi)去(qu)測(ce)交(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓2、在(zai)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)模(mo)式時，去(qu)測(ce)交(jiao)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)源3、承受(shou)太高的(de)(de)(de)瞬變4、超過(guo)(guo)大輸(shu)入限制（電(dian)(dian)(dian)(dian)(dian)(dian)壓和電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)）數字多(duo)(duo)(duo)(duo)用(yong)(yong)(yong)表(biao)(biao)(biao)保(bao)護(hu)(hu)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)的(de)(de)(de)種類1、自(zi)(zi)動(dong)恢復(fu)保(bao)護(hu)(hu)。某些(xie)表(biao)(biao)(biao)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)系(xi)統當探(tan)(tan)測(ce)到一個過(guo)(guo)載時，就會(hui)保(bao)護(hu)(hu)該表(biao)(biao)(biao)直至(zhi)這(zhe)(zhe)種情況不(bu)再存在(zai)。過(guo)(guo)載被(bei)去(qu)除后，數字多(duo)(duo)(duo)(duo)用(yong)(yong)(yong)表(biao)(biao)(biao)自(zi)(zi)動(dong)返回正(zheng)常(chang)運(yun)行狀態。通常(chang)被(bei)用(yong)(yong)(yong)來(lai)保(bao)護(hu)(hu)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)功能(neng)，避免(mian)電(dian)(dian)(dian)(dian)(dian)(dian)壓過(guo)(guo)載。2、沒有(you)自(zi)(zi)動(dong)恢復(fu)功能(neng)。某些(xie)表(biao)(biao)(biao)探(tan)(tan)測(ce)到過(guo)(guo)載后會(hui)保(bao)護(hu)(hu)表(biao)(biao)(biao)，但不(bu)會(hui)自(zi)(zi)動(dong)恢復(fu)，直至(zhi)使(shi)(shi)(shi)用(yong)(yong)(yong)者(zhe)采(cai)取(qu)相應(ying)(ying)措施，如更換電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)，才能(neng)恢復(fu)使(shi)(shi)(shi)用(yong)(yong)(yong)。歡迎(ying)來(lai)電(dian)(dian)(dian)(dian)(dian)(dian)咨詢！使(shi)(shi)(shi)用(yong)(yong)(yong)數字萬(wan)用(yong)(yong)(yong)表(biao)(biao)(biao)可以快速(su)準(zhun)(zhun)確地測(ce)量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)路(lu)(lu)(lu)中(zhong)的(de)(de)(de)各(ge)種參數。貴州(zhou)藍牙萬(wan)用(yong)(yong)(yong)表(biao)(biao)(biao)UT17B PRO

我們的(de)數字萬(wan)用(yong)表經過嚴格的(de)質量控制(zhi)和(he)測試，保證穩定性和(he)可靠(kao)性。深圳UT54數字萬(wan)用(yong)表服(fu)務(wu)商

數字(zi)(zi)萬用(yong)(yong)(yong)表(biao)(biao)可以(yi)測量(liang)(liang)發光二(er)(er)極(ji)(ji)(ji)管(guan)(guan)(guan)，整(zheng)流二(er)(er)極(ji)(ji)(ji)管(guan)(guan)(guan)……測量(liang)(liang)時(shi)(shi)，表(biao)(biao)筆(bi)(bi)(bi)位置與電(dian)壓(ya)測量(liang)(liang)一樣，將旋鈕(niu)旋到"-|>|--"(不會畫這(zhe)個標志)檔(dang)；用(yong)(yong)(yong)紅(hong)表(biao)(biao)筆(bi)(bi)(bi)接(jie)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)(guan)的(de)正(zheng)(zheng)(zheng)極(ji)(ji)(ji)，黑表(biao)(biao)筆(bi)(bi)(bi)接(jie)負極(ji)(ji)(ji)，這(zhe)時(shi)(shi)會顯(xian)示(shi)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)(guan)的(de)正(zheng)(zheng)(zheng)向壓(ya)降。肖特(te)基二(er)(er)極(ji)(ji)(ji)管(guan)(guan)(guan)的(de)壓(ya)降是0.2V左右，普通硅整(zheng)流管(guan)(guan)(guan)（1N4000、1N5400系(xi)列(lie)等）約為(wei)0.7V，發光二(er)(er)極(ji)(ji)(ji)管(guan)(guan)(guan)約為(wei)1.8～2.3V。調(diao)換表(biao)(biao)筆(bi)(bi)(bi)，顯(xian)示(shi)屏顯(xian)示(shi)“1.”則(ze)為(wei)正(zheng)(zheng)(zheng)常(chang)，因為(wei)二(er)(er)極(ji)(ji)(ji)管(guan)(guan)(guan)的(de)反(fan)向電(dian)阻很大，否則(ze)此管(guan)(guan)(guan)已被擊(ji)穿。對(dui)于指針式萬用(yong)(yong)(yong)表(biao)(biao)，紅(hong)表(biao)(biao)筆(bi)(bi)(bi)表(biao)(biao)內接(jie)電(dian)池負極(ji)(ji)(ji)，黑表(biao)(biao)筆(bi)(bi)(bi)表(biao)(biao)內接(jie)電(dian)池正(zheng)(zheng)(zheng)極(ji)(ji)(ji)，所以(yi)使用(yong)(yong)(yong)指針式表(biao)(biao)測二(er)(er)極(ji)(ji)(ji)管(guan)(guan)(guan)時(shi)(shi)若(ruo)阻值(zhi)(zhi)很小，則(ze)黑表(biao)(biao)筆(bi)(bi)(bi)一端為(wei)正(zheng)(zheng)(zheng)極(ji)(ji)(ji)；若(ruo)阻值(zhi)(zhi)很大，則(ze)紅(hong)表(biao)(biao)筆(bi)(bi)(bi)一端為(wei)負極(ji)(ji)(ji)。對(dui)于數字(zi)(zi)式萬用(yong)(yong)(yong)表(biao)(biao)，若(ruo)阻值(zhi)(zhi)很小，紅(hong)表(biao)(biao)筆(bi)(bi)(bi)為(wei)正(zheng)(zheng)(zheng)極(ji)(ji)(ji)；阻值(zhi)(zhi)大，黑表(biao)(biao)筆(bi)(bi)(bi)為(wei)負極(ji)(ji)(ji)。深圳UT54數字(zi)(zi)萬用(yong)(yong)(yong)表(biao)(biao)服務(wu)商

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