一、電壓表是不是內阻越大越好

電壓表內阻越(yue)大越(yue)好，主要原因有以下：

1、因為開路(lu)電(dian)(dian)壓測量(liang)要求測量(liang)儀器的(de)加入不影響(xiang)信號(hao)的(de)原式狀(zhuang)態,如果電(dian)(dian)壓表(biao)(biao)內阻不夠大,就會(hui)引起開路(lu)電(dian)(dian)壓發生變化,造成測量(liang)結果的(de)不正確。所(suo)以盡量(liang)選擇內阻為無窮大的(de)電(dian)(dian)壓表(biao)(biao)測量(liang)。

2、電(dian)壓(ya)(ya)表(biao)的(de)(de)內阻越(yue)大越(yue)好(hao)，因為(wei)在測電(dian)壓(ya)(ya)時(shi)，電(dian)壓(ya)(ya)表(biao)是與被測部分(fen)(fen)并聯的(de)(de)。當電(dian)壓(ya)(ya)表(biao)的(de)(de)內阻越(yue)大時(shi)，則(ze)并聯后的(de)(de)總電(dian)阻與被測體的(de)(de)本身的(de)(de)電(dian)阻越(yue)接(jie)近，則(ze)回路電(dian)流越(yue)接(jie)近真實(shi)值，或者(zhe)說電(dian)壓(ya)(ya)表(biao)分(fen)(fen)流越(yue)小(xiao)越(yue)準確，測的(de)(de)結果也(ye)就越(yue)準確。

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)壓(ya)(ya)表(biao)可以用來(lai)測量電(dian)(dian)壓(ya)(ya)，當(dang)電(dian)(dian)壓(ya)(ya)表(biao)并聯在電(dian)(dian)路當(dang)中(zhong)時，會被這個串聯的(de)電(dian)(dian)阻所(suo)分(fen)擔。那么，接下來(lai)為大家介紹電(dian)(dian)壓(ya)(ya)表(biao)串聯在電(dian)(dian)路中(zhong)會怎么樣。

會(hui)出(chu)現(xian)斷路(lu)(lu)現(xian)象，數值會(hui)出(chu)現(xian)0。在(zai)使用電(dian)(dian)壓(ya)表時(shi)，要先(xian)根據測(ce)量(liang)(liang)大小選擇合適的量(liang)(liang)程，然(ran)后進(jin)行接線，要是電(dian)(dian)壓(ya)表接錯，出(chu)現(xian)串聯，那會(hui)因內阻太大，使得測(ce)量(liang)(liang)電(dian)(dian)路(lu)(lu)出(chu)現(xian)開(kai)路(lu)(lu)狀態，這(zhe)樣(yang)電(dian)(dian)壓(ya)表就(jiu)沒(mei)辦(ban)法正常(chang)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(fa)(fa)，簡單說(shuo)法(fa)(fa)就是(shi)用手捂住電源，主要看(kan)(kan)電壓表與哪部分構成(cheng)閉合回路，就可以清(qing)晰看(kan)(kan)出電壓表測的是(shi)哪部分電路的電壓了(le)。

2、滑線法

電(dian)(dian)壓(ya)(ya)表(biao)(biao)的(de)兩端(duan)沿著(zhu)連接的(de)導(dao)線滑(hua)動到耗電(dian)(dian)元件(jian)或電(dian)(dian)源的(de)兩端(duan)（可以(yi)(yi)跨越組件(jian)：開關(guan)、電(dian)(dian)流表(biao)(biao)）。不要交叉組件(jian)：電(dian)(dian)源、電(dian)(dian)器、電(dian)(dian)壓(ya)(ya)表(biao)(biao)。）滑(hua)動以(yi)(yi)查看(kan)電(dian)(dian)壓(ya)(ya)表(biao)(biao)測得的(de)電(dian)(dian)壓(ya)(ya)是(shi)否為電(dian)(dian)源電(dian)(dian)壓(ya)(ya)。

3、短路法

假設(she)導線(xian)連(lian)接(jie)到(dao)此(ci)位置，則電(dian)(dian)壓表被拆下(xia)。如(ru)果(guo)此(ci)時(shi)某(mou)些耗電(dian)(dian)元件或(huo)電(dian)(dian)源短路，則這(zhe)些耗電(dian)(dian)元件或(huo)電(dian)(dian)源是電(dian)(dian)壓表的測(ce)量對(dui)象。

四、電壓表的工作原理是什么

傳(chuan)統的(de)(de)指(zhi)針(zhen)式(shi)電(dian)(dian)(dian)(dian)壓(ya)表(biao)和電(dian)(dian)(dian)(dian)流(liu)表(biao)都是(shi)根據一個(ge)原(yuan)理就(jiu)是(shi)電(dian)(dian)(dian)(dian)流(liu)的(de)(de)磁效應。電(dian)(dian)(dian)(dian)流(liu)越(yue)大，所產生(sheng)的(de)(de)磁力(li)越(yue)大，表(biao)現出(chu)的(de)(de)就(jiu)是(shi)電(dian)(dian)(dian)(dian)壓(ya)表(biao)上(shang)的(de)(de)指(zhi)針(zhen)的(de)(de)擺幅越(yue)大，電(dian)(dian)(dian)(dian)壓(ya)表(biao)內有一個(ge)磁鐵(tie)和一個(ge)導線線圈(quan)，通過電(dian)(dian)(dian)(dian)流(liu)后，會使線圈(quan)產生(sheng)磁場，線圈(quan)通電(dian)(dian)(dian)(dian)后在磁鐵(tie)的(de)(de)作用下會發生(sheng)偏轉，這就(jiu)是(shi)電(dian)(dian)(dian)(dian)流(liu)表(biao)、電(dian)(dian)(dian)(dian)壓(ya)表(biao)的(de)(de)表(biao)頭(tou)部分(fen)。

由于電(dian)(dian)(dian)壓(ya)表(biao)(biao)要與被測電(dian)(dian)(dian)阻并聯(lian)，所以(yi)如果直接(jie)用(yong)靈敏電(dian)(dian)(dian)流(liu)計當(dang)電(dian)(dian)(dian)壓(ya)表(biao)(biao)用(yong)，表(biao)(biao)中的(de)電(dian)(dian)(dian)流(liu)過大，會燒(shao)壞電(dian)(dian)(dian)表(biao)(biao)，這(zhe)(zhe)時需要在電(dian)(dian)(dian)壓(ya)表(biao)(biao)的(de)內部(bu)電(dian)(dian)(dian)路中串聯(lian)一個(ge)很(hen)(hen)大的(de)電(dian)(dian)(dian)阻，這(zhe)(zhe)樣改(gai)造后，當(dang)電(dian)(dian)(dian)壓(ya)表(biao)(biao)再(zai)并聯(lian)在電(dian)(dian)(dian)路中時，由于電(dian)(dian)(dian)阻的(de)作(zuo)用(yong)，加在電(dian)(dian)(dian)表(biao)(biao)兩(liang)端的(de)電(dian)(dian)(dian)壓(ya)絕(jue)大部(bu)分都被這(zhe)(zhe)個(ge)串聯(lian)的(de)電(dian)(dian)(dian)阻分擔了(le)(le)，所以(yi)通過電(dian)(dian)(dian)表(biao)(biao)的(de)電(dian)(dian)(dian)流(liu)實(shi)際(ji)上很(hen)(hen)小(xiao)，所以(yi)就可以(yi)正常使用(yong)了(le)(le)。