一、電壓表是不是內阻越大越好

電壓表內阻(zu)越(yue)大越(yue)好，主要(yao)原因有以下(xia)：

1、因為開(kai)路電壓測(ce)量要求測(ce)量儀器的(de)(de)(de)加入不影響信號的(de)(de)(de)原式狀態(tai),如果電壓表內阻(zu)不夠大(da),就會引(yin)起開(kai)路電壓發(fa)生變化,造成測(ce)量結果的(de)(de)(de)不正確。所以盡量選擇內阻(zu)為無窮大(da)的(de)(de)(de)電壓表測(ce)量。

2、電(dian)壓(ya)(ya)表(biao)的(de)(de)內(nei)阻(zu)越(yue)(yue)(yue)(yue)大(da)(da)越(yue)(yue)(yue)(yue)好，因(yin)為在測(ce)電(dian)壓(ya)(ya)時，電(dian)壓(ya)(ya)表(biao)是與被(bei)測(ce)部分并聯(lian)的(de)(de)。當電(dian)壓(ya)(ya)表(biao)的(de)(de)內(nei)阻(zu)越(yue)(yue)(yue)(yue)大(da)(da)時，則并聯(lian)后(hou)的(de)(de)總(zong)電(dian)阻(zu)與被(bei)測(ce)體的(de)(de)本身的(de)(de)電(dian)阻(zu)越(yue)(yue)(yue)(yue)接(jie)近，則回路電(dian)流(liu)越(yue)(yue)(yue)(yue)接(jie)近真實(shi)值(zhi)，或者說電(dian)壓(ya)(ya)表(biao)分流(liu)越(yue)(yue)(yue)(yue)小越(yue)(yue)(yue)(yue)準(zhun)(zhun)確，測(ce)的(de)(de)結果也就越(yue)(yue)(yue)(yue)準(zhun)(zhun)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)壓(ya)表可(ke)以(yi)用來測量電(dian)壓(ya)，當電(dian)壓(ya)表并聯(lian)(lian)在(zai)電(dian)路(lu)當中(zhong)時(shi)，會被(bei)這個串聯(lian)(lian)的電(dian)阻所分擔。那么，接下來為(wei)大家(jia)介紹電(dian)壓(ya)表串聯(lian)(lian)在(zai)電(dian)路(lu)中(zhong)會怎么樣。

會(hui)出現(xian)斷(duan)路(lu)現(xian)象，數值會(hui)出現(xian)0。在使(shi)用電壓表(biao)時(shi)，要先(xian)根據測量大(da)小選擇合(he)適(shi)的量程，然(ran)后進(jin)行(xing)接(jie)線，要是電壓表(biao)接(jie)錯，出現(xian)串聯(lian)，那會(hui)因(yin)內阻太大(da)，使(shi)得測量電路(lu)出現(xian)開路(lu)狀(zhuang)態，這(zhe)樣電壓表(biao)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(suo)謂的(de)去源(yuan)法，簡單說法就是(shi)用(yong)手捂(wu)住電源(yuan)，主要看(kan)電壓表(biao)與(yu)哪(na)部分(fen)構成閉合(he)回(hui)路，就可以清晰看(kan)出電壓表(biao)測(ce)的(de)是(shi)哪(na)部分(fen)電路的(de)電壓了。

2、滑線法

電(dian)(dian)(dian)壓表(biao)的(de)兩(liang)端沿著連(lian)接的(de)導線滑(hua)動到(dao)耗電(dian)(dian)(dian)元件(jian)或電(dian)(dian)(dian)源的(de)兩(liang)端（可以跨越組(zu)件(jian)：開關、電(dian)(dian)(dian)流表(biao)）。不要交叉組(zu)件(jian)：電(dian)(dian)(dian)源、電(dian)(dian)(dian)器(qi)、電(dian)(dian)(dian)壓表(biao)。）滑(hua)動以查看電(dian)(dian)(dian)壓表(biao)測(ce)得的(de)電(dian)(dian)(dian)壓是否為電(dian)(dian)(dian)源電(dian)(dian)(dian)壓。

3、短路法

假設導(dao)線連(lian)接到此位置，則(ze)電(dian)(dian)壓表被拆下。如果此時某(mou)些耗電(dian)(dian)元件或電(dian)(dian)源(yuan)短路(lu)，則(ze)這(zhe)些耗電(dian)(dian)元件或電(dian)(dian)源(yuan)是電(dian)(dian)壓表的測量對象。

四、電壓表的工作原理是什么

傳統的(de)(de)(de)指(zhi)針(zhen)式電(dian)(dian)(dian)(dian)(dian)壓表(biao)和電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)都是(shi)(shi)根據一個原理就(jiu)是(shi)(shi)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)的(de)(de)(de)磁效應。電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)越(yue)(yue)大，所產(chan)生的(de)(de)(de)磁力(li)越(yue)(yue)大，表(biao)現出的(de)(de)(de)就(jiu)是(shi)(shi)電(dian)(dian)(dian)(dian)(dian)壓表(biao)上(shang)的(de)(de)(de)指(zhi)針(zhen)的(de)(de)(de)擺幅越(yue)(yue)大，電(dian)(dian)(dian)(dian)(dian)壓表(biao)內有一個磁鐵(tie)和一個導線(xian)線(xian)圈，通過電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)后，會使(shi)線(xian)圈產(chan)生磁場，線(xian)圈通電(dian)(dian)(dian)(dian)(dian)后在磁鐵(tie)的(de)(de)(de)作用下會發生偏轉，這就(jiu)是(shi)(shi)電(dian)(dian)(dian)(dian)(dian)流(liu)(liu)(liu)表(biao)、電(dian)(dian)(dian)(dian)(dian)壓表(biao)的(de)(de)(de)表(biao)頭(tou)部分。

由(you)于電(dian)(dian)(dian)壓表要(yao)與被(bei)測電(dian)(dian)(dian)阻并(bing)聯(lian)(lian)，所(suo)以(yi)如果直接用(yong)靈敏(min)電(dian)(dian)(dian)流計(ji)當(dang)電(dian)(dian)(dian)壓表用(yong)，表中的(de)電(dian)(dian)(dian)流過大(da)，會燒壞電(dian)(dian)(dian)表，這時(shi)需要(yao)在(zai)(zai)電(dian)(dian)(dian)壓表的(de)內(nei)部電(dian)(dian)(dian)路(lu)中串(chuan)聯(lian)(lian)一(yi)個很大(da)的(de)電(dian)(dian)(dian)阻，這樣改造后，當(dang)電(dian)(dian)(dian)壓表再(zai)并(bing)聯(lian)(lian)在(zai)(zai)電(dian)(dian)(dian)路(lu)中時(shi)，由(you)于電(dian)(dian)(dian)阻的(de)作用(yong)，加在(zai)(zai)電(dian)(dian)(dian)表兩端的(de)電(dian)(dian)(dian)壓絕大(da)部分都被(bei)這個串(chuan)聯(lian)(lian)的(de)電(dian)(dian)(dian)阻分擔了，所(suo)以(yi)通過電(dian)(dian)(dian)表的(de)電(dian)(dian)(dian)流實際上很小，所(suo)以(yi)就可以(yi)正常使用(yong)了。