一、電壓表是不是內阻越大越好
電壓表(biao)內阻越大(da)越好,主要(yao)原因(yin)有以下:
1、因(yin)為(wei)開(kai)路電壓(ya)測量要求測量儀器(qi)的(de)加入(ru)不(bu)(bu)影響(xiang)信號(hao)的(de)原式狀態,如果電壓(ya)表內阻(zu)不(bu)(bu)夠大,就會引起開(kai)路電壓(ya)發生變化,造成測量結果的(de)不(bu)(bu)正確。所以盡(jin)量選擇(ze)內阻(zu)為(wei)無窮大的(de)電壓(ya)表測量。
2、電(dian)(dian)壓(ya)(ya)(ya)表的內阻(zu)越(yue)大(da)越(yue)好,因為在(zai)測(ce)(ce)(ce)電(dian)(dian)壓(ya)(ya)(ya)時(shi),電(dian)(dian)壓(ya)(ya)(ya)表是與被(bei)(bei)測(ce)(ce)(ce)部分并(bing)聯(lian)(lian)的。當電(dian)(dian)壓(ya)(ya)(ya)表的內阻(zu)越(yue)大(da)時(shi),則(ze)并(bing)聯(lian)(lian)后的總電(dian)(dian)阻(zu)與被(bei)(bei)測(ce)(ce)(ce)體的本身的電(dian)(dian)阻(zu)越(yue)接近,則(ze)回路電(dian)(dian)流越(yue)接近真實值,或者(zhe)說電(dian)(dian)壓(ya)(ya)(ya)表分流越(yue)小越(yue)準(zhun)確,測(ce)(ce)(ce)的結果也就越(yue)準(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(biao)可以用(yong)來(lai)測量電(dian)壓(ya),當(dang)電(dian)壓(ya)表(biao)并聯(lian)在(zai)電(dian)路(lu)當(dang)中時(shi),會被這個串聯(lian)的電(dian)阻所分擔。那么(me),接下來(lai)為大家介紹電(dian)壓(ya)表(biao)串聯(lian)在(zai)電(dian)路(lu)中會怎么(me)樣。
會出(chu)現斷路(lu)(lu)現象,數值會出(chu)現0。在使用電(dian)壓(ya)表時,要先根據測量大小選擇合適(shi)的(de)量程,然后進行接線,要是電(dian)壓(ya)表接錯(cuo),出(chu)現串聯(lian),那會因(yin)內(nei)阻太大,使得測量電(dian)路(lu)(lu)出(chu)現開(kai)路(lu)(lu)狀態(tai),這(zhe)樣(yang)電(dian)壓(ya)表就沒(mei)辦(ban)法(fa)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,簡單說(shuo)法就(jiu)是(shi)用(yong)手(shou)捂(wu)住電(dian)(dian)源,主要看電(dian)(dian)壓表與哪部(bu)分構成(cheng)閉合(he)回路,就(jiu)可以清晰看出電(dian)(dian)壓表測的是(shi)哪部(bu)分電(dian)(dian)路的電(dian)(dian)壓了(le)。
2、滑線法
電(dian)(dian)壓表(biao)(biao)的(de)兩端(duan)沿著連接的(de)導(dao)線(xian)滑(hua)動(dong)到(dao)耗電(dian)(dian)元件(jian)或電(dian)(dian)源(yuan)的(de)兩端(duan)(可以跨(kua)越組件(jian):開關、電(dian)(dian)流(liu)表(biao)(biao))。不要交叉組件(jian):電(dian)(dian)源(yuan)、電(dian)(dian)器、電(dian)(dian)壓表(biao)(biao)。)滑(hua)動(dong)以查看電(dian)(dian)壓表(biao)(biao)測(ce)得的(de)電(dian)(dian)壓是否為(wei)電(dian)(dian)源(yuan)電(dian)(dian)壓。
3、短路法
假(jia)設導線(xian)連接到此位置(zhi),則電壓表(biao)(biao)被拆下。如(ru)果(guo)此時某些耗電元件(jian)或電源(yuan)短路,則這些耗電元件(jian)或電源(yuan)是電壓表(biao)(biao)的測量對(dui)象。
四、電壓表的工作原理是什么
傳統(tong)的(de)(de)(de)指針式電(dian)(dian)壓(ya)表(biao)和(he)電(dian)(dian)流(liu)表(biao)都是根據一個(ge)(ge)原理就是電(dian)(dian)流(liu)的(de)(de)(de)磁(ci)(ci)效(xiao)應。電(dian)(dian)流(liu)越(yue)大,所產生(sheng)的(de)(de)(de)磁(ci)(ci)力越(yue)大,表(biao)現出的(de)(de)(de)就是電(dian)(dian)壓(ya)表(biao)上的(de)(de)(de)指針的(de)(de)(de)擺(bai)幅越(yue)大,電(dian)(dian)壓(ya)表(biao)內有一個(ge)(ge)磁(ci)(ci)鐵和(he)一個(ge)(ge)導線線圈(quan),通(tong)過電(dian)(dian)流(liu)后(hou),會(hui)(hui)使線圈(quan)產生(sheng)磁(ci)(ci)場(chang),線圈(quan)通(tong)電(dian)(dian)后(hou)在磁(ci)(ci)鐵的(de)(de)(de)作用下會(hui)(hui)發(fa)生(sheng)偏轉,這就是電(dian)(dian)流(liu)表(biao)、電(dian)(dian)壓(ya)表(biao)的(de)(de)(de)表(biao)頭(tou)部分。
由(you)于電(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)要與被測電(dian)(dian)(dian)阻并(bing)聯(lian),所以如果直接用(yong)(yong)靈敏電(dian)(dian)(dian)流計當電(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)用(yong)(yong),表(biao)(biao)(biao)(biao)中(zhong)的(de)電(dian)(dian)(dian)流過大,會燒(shao)壞電(dian)(dian)(dian)表(biao)(biao)(biao)(biao),這(zhe)時(shi)需要在電(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)的(de)內部電(dian)(dian)(dian)路(lu)中(zhong)串(chuan)聯(lian)一(yi)個很大的(de)電(dian)(dian)(dian)阻,這(zhe)樣改(gai)造后,當電(dian)(dian)(dian)壓(ya)(ya)表(biao)(biao)(biao)(biao)再并(bing)聯(lian)在電(dian)(dian)(dian)路(lu)中(zhong)時(shi),由(you)于電(dian)(dian)(dian)阻的(de)作用(yong)(yong),加在電(dian)(dian)(dian)表(biao)(biao)(biao)(biao)兩(liang)端(duan)的(de)電(dian)(dian)(dian)壓(ya)(ya)絕大部分都(dou)被這(zhe)個串(chuan)聯(lian)的(de)電(dian)(dian)(dian)阻分擔了,所以通過電(dian)(dian)(dian)表(biao)(biao)(biao)(biao)的(de)電(dian)(dian)(dian)流實際(ji)上很小,所以就可以正常使(shi)用(yong)(yong)了。