變壓(ya)器直流(liu)電阻測試儀使用(yong)方(fang)法

變壓(ya)器直(zhi)(zhi)流電阻測試儀內(nei)有一個(ge)能產生直(zhi)(zhi)流電流的恒流源。在測量電阻時，恒流從I＋、I－端向被試品饋入恒流，該電(dian)流在被測(ce)體上產(chan)生相應的電(dian)壓值(zhi)，這(zhe)一(yi)電(dian)壓值(zhi)在V＋、V－端取回本機，經(jing)放大后，直接用(yong)四位半(ban)LCD數字顯示被試(shi)品(pin)的電(dian)阻值。

1、電(dian)源(yuan)

本(ben)儀器有兩(liang)種供電方式：AC220V／DC14.8V。在(zai)強電磁場干擾(rao)的情況下，建議(yi)最好使用(yong)直(zhi)流電源(yuan)測試，此狀態下測試的數值穩(wen)定，抗工頻干擾(rao)能力強。

A、直(zhi)流電源(yuan)測試：

閉合電源(yuan)開關，電源(yuan)指示燈亮，按(an)下(xia)“啟停"鍵，即可選擇(ze)相應電阻檔(dang)位(wei)開關(guan)進行(xing)測(ce)試(shi)。測(ce)試(shi)完畢后，按(an)下“啟停"鍵，“放(fang)(fang)電"指(zhi)(zhi)(zhi)示(shi)燈亮（若(ruo)被(bei)試(shi)品儲存(cun)電量較小，則“放(fang)(fang)電"指(zhi)(zhi)(zhi)示(shi)燈不亮），放(fang)(fang)電后，“放(fang)(fang)電"指(zhi)(zhi)(zhi)示(shi)燈熄滅(mie)，再轉換測(ce)試(shi)夾(jia)，進行(xing)再次測(ce)試(shi)。

B、交流電源(yuan)測試：

接上交(jiao)流AC220V電源(yuan)，相應指(zhi)示燈（“充電(dian)(dian)(dian)(dian)"指示(shi)(shi)燈(deng)或者(zhe)“充滿"指示(shi)(shi)燈(deng)）亮，閉合電(dian)(dian)(dian)(dian)源開關(guan)，電(dian)(dian)(dian)(dian)源指示(shi)(shi)燈(deng)亮，按下“啟停"鍵，即可(ke)選擇(ze)相應(ying)電(dian)(dian)(dian)(dian)阻檔位(wei)開關(guan)進行測試。測試完畢后，按下“啟停"鍵，“放(fang)電(dian)(dian)(dian)(dian)"指示(shi)(shi)燈(deng)亮（若被試品儲(chu)存電(dian)(dian)(dian)(dian)量較小，則“放(fang)電(dian)(dian)(dian)(dian)"指示(shi)(shi)燈(deng)不亮），放(fang)電(dian)(dian)(dian)(dian)后，“放(fang)電(dian)(dian)(dian)(dian)"指示(shi)(shi)燈(deng)熄滅，再轉換(huan)測試夾，進行再次測試。

Ｃ、充電：

接(jie)上交流AC220V電(dian)(dian)(dian)源，此時“充(chong)電(dian)(dian)(dian)"指示燈(deng)亮，表示正在對儀(yi)(yi)器(qi)(qi)內的(de)充(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)池(chi)(chi)進(jin)行(xing)充(chong)電(dian)(dian)(dian)工作(zuo)。若儀(yi)(yi)器(qi)(qi)內的(de)可充(chong)電(dian)(dian)(dian)電(dian)(dian)(dian)池(chi)(chi)電(dian)(dian)(dian)量較(jiao)足，則“充(chong)滿"指示燈(deng)亮。儀(yi)(yi)器(qi)(qi)在使用交(jiao)流電(dian)(dian)(dian)源測試的(de)同時也在對機內電(dian)(dian)(dian)池(chi)(chi)進(jin)行(xing)充(chong)電(dian)(dian)(dian)。（儀(yi)(yi)器(qi)(qi)設計了充(chong)電(dian)(dian)(dian)保(bao)護電(dian)(dian)(dian)路，不會(hui)有過充(chong)現象產生(sheng)）

2、測試線(xian)的聯接方法

將儀器(qi)的I＋、V＋、V－、I－端子(zi)與被(bei)試品按圖(tu)二的方法連接好。這種(zhong)連接法，可消(xiao)除接觸電阻(zu)以(yi)及(ji)連線(xian)電阻(zu)對測(ce)量的影(ying)響。