一、電壓表是不是內阻越大越好
電壓表(biao)內阻越(yue)(yue)大越(yue)(yue)好,主要原因有以下:
1、因為開路(lu)電(dian)(dian)壓(ya)測量(liang)要求測量(liang)儀器的(de)(de)加入不影響信號(hao)的(de)(de)原式狀態(tai),如(ru)果電(dian)(dian)壓(ya)表內阻不夠大(da),就會引起開路(lu)電(dian)(dian)壓(ya)發生變化,造成測量(liang)結果的(de)(de)不正確。所以盡量(liang)選擇內阻為無窮大(da)的(de)(de)電(dian)(dian)壓(ya)表測量(liang)。
2、電(dian)壓表(biao)的(de)(de)(de)內阻越(yue)大越(yue)好,因為在(zai)測電(dian)壓時,電(dian)壓表(biao)是(shi)與被測部分(fen)并聯的(de)(de)(de)。當(dang)電(dian)壓表(biao)的(de)(de)(de)內阻越(yue)大時,則并聯后的(de)(de)(de)總電(dian)阻與被測體的(de)(de)(de)本身的(de)(de)(de)電(dian)阻越(yue)接近,則回路電(dian)流越(yue)接近真實值,或者說電(dian)壓表(biao)分(fen)流越(yue)小(xiao)越(yue)準確(que),測的(de)(de)(de)結果也就越(yue)準確(que)。
可以到電壓表十大品牌了解更多信息哦。
二、電壓表串聯在電路中會怎么樣
電(dian)(dian)(dian)壓(ya)表(biao)(biao)可以(yi)用來(lai)測量電(dian)(dian)(dian)壓(ya),當電(dian)(dian)(dian)壓(ya)表(biao)(biao)并(bing)聯(lian)在電(dian)(dian)(dian)路當中(zhong)時,會(hui)(hui)被這個串(chuan)聯(lian)的(de)電(dian)(dian)(dian)阻所分擔。那么(me),接下來(lai)為大家介紹電(dian)(dian)(dian)壓(ya)表(biao)(biao)串(chuan)聯(lian)在電(dian)(dian)(dian)路中(zhong)會(hui)(hui)怎(zen)么(me)樣。
會出(chu)現(xian)斷路現(xian)象,數值會出(chu)現(xian)0。在使用電(dian)(dian)壓表時,要先根據測(ce)量(liang)大小(xiao)選(xuan)擇合適(shi)的量(liang)程,然后(hou)進(jin)行接線(xian),要是電(dian)(dian)壓表接錯,出(chu)現(xian)串聯,那會因內阻(zu)太大,使得測(ce)量(liang)電(dian)(dian)路出(chu)現(xian)開(kai)路狀(zhuang)態(tai),這樣電(dian)(dian)壓表就沒辦法正常工作。
三、電壓表怎么看測哪個的電壓
1、去源法
所謂的去源法,簡(jian)單說法就是用手捂住電源,主要看電壓(ya)表與哪部分構成閉合回路(lu),就可(ke)以清晰看出(chu)電壓(ya)表測的是哪部分電路(lu)的電壓(ya)了。
2、滑線法
電(dian)(dian)(dian)壓(ya)(ya)表的(de)(de)(de)兩端(duan)沿著(zhu)連接的(de)(de)(de)導(dao)線(xian)滑(hua)(hua)動到耗(hao)電(dian)(dian)(dian)元件或電(dian)(dian)(dian)源的(de)(de)(de)兩端(duan)(可以(yi)跨(kua)越(yue)組件:開關、電(dian)(dian)(dian)流(liu)表)。不(bu)要交叉組件:電(dian)(dian)(dian)源、電(dian)(dian)(dian)器、電(dian)(dian)(dian)壓(ya)(ya)表。)滑(hua)(hua)動以(yi)查看(kan)電(dian)(dian)(dian)壓(ya)(ya)表測得的(de)(de)(de)電(dian)(dian)(dian)壓(ya)(ya)是否為電(dian)(dian)(dian)源電(dian)(dian)(dian)壓(ya)(ya)。
3、短路法
假設導線(xian)連接到此(ci)位置,則電(dian)(dian)壓表被拆下。如(ru)果(guo)此(ci)時某些耗(hao)電(dian)(dian)元件或電(dian)(dian)源短路,則這些耗(hao)電(dian)(dian)元件或電(dian)(dian)源是電(dian)(dian)壓表的(de)測量對象。
四、電壓表的工作原理是什么
傳(chuan)統的(de)(de)(de)指針(zhen)式電(dian)壓(ya)表(biao)(biao)(biao)和電(dian)流(liu)表(biao)(biao)(biao)都是根據一個原理就是電(dian)流(liu)的(de)(de)(de)磁(ci)(ci)(ci)效應。電(dian)流(liu)越大,所(suo)產生的(de)(de)(de)磁(ci)(ci)(ci)力越大,表(biao)(biao)(biao)現出(chu)的(de)(de)(de)就是電(dian)壓(ya)表(biao)(biao)(biao)上的(de)(de)(de)指針(zhen)的(de)(de)(de)擺幅(fu)越大,電(dian)壓(ya)表(biao)(biao)(biao)內有一個磁(ci)(ci)(ci)鐵和一個導(dao)線(xian)線(xian)圈(quan)(quan),通(tong)(tong)過(guo)電(dian)流(liu)后,會使線(xian)圈(quan)(quan)產生磁(ci)(ci)(ci)場(chang),線(xian)圈(quan)(quan)通(tong)(tong)電(dian)后在磁(ci)(ci)(ci)鐵的(de)(de)(de)作用下會發生偏轉,這就是電(dian)流(liu)表(biao)(biao)(biao)、電(dian)壓(ya)表(biao)(biao)(biao)的(de)(de)(de)表(biao)(biao)(biao)頭部分。
由(you)于電(dian)(dian)壓(ya)表(biao)(biao)(biao)(biao)要與(yu)被測電(dian)(dian)阻(zu)(zu)并(bing)聯,所(suo)以(yi)如(ru)果直(zhi)接用靈(ling)敏電(dian)(dian)流(liu)計當電(dian)(dian)壓(ya)表(biao)(biao)(biao)(biao)用,表(biao)(biao)(biao)(biao)中(zhong)的電(dian)(dian)流(liu)過大(da),會燒壞電(dian)(dian)表(biao)(biao)(biao)(biao),這時(shi)需(xu)要在(zai)電(dian)(dian)壓(ya)表(biao)(biao)(biao)(biao)的內部(bu)電(dian)(dian)路中(zhong)串聯一個很大(da)的電(dian)(dian)阻(zu)(zu),這樣改造后(hou),當電(dian)(dian)壓(ya)表(biao)(biao)(biao)(biao)再并(bing)聯在(zai)電(dian)(dian)路中(zhong)時(shi),由(you)于電(dian)(dian)阻(zu)(zu)的作(zuo)用,加在(zai)電(dian)(dian)表(biao)(biao)(biao)(biao)兩端(duan)的電(dian)(dian)壓(ya)絕大(da)部(bu)分(fen)(fen)都被這個串聯的電(dian)(dian)阻(zu)(zu)分(fen)(fen)擔了,所(suo)以(yi)通(tong)過電(dian)(dian)表(biao)(biao)(biao)(biao)的電(dian)(dian)流(liu)實際(ji)上很小,所(suo)以(yi)就可以(yi)正常使用了。