高精度回路電阻測試儀簡介：

以前，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)系統中普遍(bian)采用(yong)常規(gui)的(de)(de)(de)QJ44型(xing)雙臂直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)橋測量(liang)變壓(ya)器(qi)線圈(quan)的(de)(de)(de)直(zhi)流(liu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)、高(gao)(gao)壓(ya)斷路(lu)器(qi)的(de)(de)(de)接觸(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)，而(er)這類電(dian)(dian)(dian)(dian)(dian)(dian)(dian)橋的(de)(de)(de)測試電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)僅為(wei)mA級，難以發現(xian)(xian)變壓(ya)器(qi)線圈(quan)導電(dian)(dian)(dian)(dian)(dian)(dian)(dian)回路(lu)導體截面(mian)積減(jian)少的(de)(de)(de)缺陷(xian)。在測量(liang)高(gao)(gao)壓(ya)開(kai)(kai)關(guan)導電(dian)(dian)(dian)(dian)(dian)(dian)(dian)回路(lu)接觸(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)時，由于受到油膜和動靜觸(chu)(chu)頭間氧化層的(de)(de)(de)影響，測量(liang)偏差(cha)大(da)，掩蓋了(le)真(zhen)實(shi)的(de)(de)(de)接觸(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)值(zhi)。因此，電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)部標(biao)準(zhun)(zhun)SD301-88《交流(liu)500KV電(dian)(dian)(dian)(dian)(dian)(dian)(dian)氣(qi)設(she)備交接和預防(fang)試驗規(gui)程(cheng)》和新版《電(dian)(dian)(dian)(dian)(dian)(dian)(dian)氣(qi)設(she)備預防(fang)性試驗規(gui)程(cheng)》對斷路(lu)器(qi)、隔離開(kai)(kai)關(guan)接觸(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)的(de)(de)(de)測量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)作出不小(xiao)于直(zhi)流(liu)100A的(de)(de)(de)規(gui)定，以保證(zheng)準(zhun)(zhun)確度。采用(yong)微型(xing)單(dan)片機(ji)控制，人性化漢字(zi)界面(mian)顯示，它是(shi)用(yong)于開(kai)(kai)關(guan)控制設(she)備的(de)(de)(de)接觸(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)、回路(lu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)測量(liang)的(de)(de)(de)專用(yong)設(she)備；其測試電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)采用(yong)國家標(biao)準(zhun)(zhun)GB763推薦的(de)(de)(de)100A直(zhi)流(liu)，可在100A電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)的(de)(de)(de)情(qing)況下直(zhi)接測得回路(lu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)或者(zhe)接觸(chu)(chu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)，用(yong)液晶顯示測試電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)值(zhi)及測試電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)值(zhi)，可以打印輸出。該儀器(qi)測量(liang)準(zhun)(zhun)確、性能穩定，操作方便。適合電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力(li)、供(gong)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)部門現(xian)(xian)場高(gao)(gao)壓(ya)開(kai)(kai)關(guan)維修和高(gao)(gao)壓(ya)開(kai)(kai)關(guan)廠(chang)回路(lu)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)測試的(de)(de)(de)要求。

高精度回路電阻測試儀技術指標：

1、測量范(fan)圍：1-1999.9µΩ 分辨(bian)率：0.1µΩ

2、測量電流：直流100A±2%(開機)

3、測量(liang)精度： 0.5%±5個字

4、顯示(shi)方(fang)式：大屏幕漢字(zi)液晶(jing)

5、電源(yuan)： AC220V 50Hz

6、最(zui)大輸出電壓(ya)： DC 5V

7、標準(zhun)輸出電(dian)流： DC 100A±2%(開機(ji))

8、本機電壓/電流線(xian)(xian)分(fen)方向(xiang)，不可任意接線(xian)(xian)。

9、測試(shi)時(shi)間設置范(fan)圍：10―30-60S

 測量接線(xian)圖：

測(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)時的(de)(de)接線(xian)原理圖如圖所示，本(ben)測(ce)(ce)(ce)(ce)試(shi)(shi)儀配備的(de)(de)測(ce)(ce)(ce)(ce)試(shi)(shi)夾(jia)可(ke)同時完成100A電(dian)(dian)(dian)(dian)流輸出(chu)(chu)(chu)和監測(ce)(ce)(ce)(ce)輸出(chu)(chu)(chu)電(dian)(dian)(dian)(dian)壓(ya)的(de)(de)雙(shuang)重功能(neng)。測(ce)(ce)(ce)(ce)試(shi)(shi)線(xian)上的(de)(de)粗線(xian)為電(dian)(dian)(dian)(dian)流輸出(chu)(chu)(chu)線(xian)，可(ke)向被(bei)試(shi)(shi)品提(ti)供100A直(zhi)流電(dian)(dian)(dian)(dian)流；測(ce)(ce)(ce)(ce)試(shi)(shi)線(xian)上的(de)(de)細線(xian)為測(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)輸入(ru)線(xian)，可(ke)將被(bei)試(shi)(shi)品兩端的(de)(de)電(dian)(dian)(dian)(dian)壓(ya)送入(ru)測(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)儀，從而轉換(huan)成電(dian)(dian)(dian)(dian)阻值(zhi)顯示出(chu)(chu)(chu)來(lai)。由于測(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)的(de)(de)是微電(dian)(dian)(dian)(dian)阻值(zhi)，為使測(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)準確，必須特別注意：測(ce)(ce)(ce)(ce)試(shi)(shi)夾(jia)的(de)(de)位置必須盡量(liang)(liang)(liang)(liang)靠近(jin)被(bei)試(shi)(shi)品的(de)(de)測(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)點(dian)，并將被(bei)試(shi)(shi)品夾(jia)緊，這樣，測(ce)(ce)(ce)(ce)量(liang)(liang)(liang)(liang)出(chu)(chu)(chu)來(lai)的(de)(de)值(zhi)才可(ke)靠。

測量步驟：

1.將測試線(xian)與儀器接好，夾好被試品。

2.連接(jie)好地線（也可將(jiang)接(jie)地線夾子夾住(zhu)箱子提手(shou)金屬部分）!!!

3.插上220V電源，打開電源開關(guan)，正確輸入測(ce)試時長。

4.正確(que)選擇測試電(dian)流檔位，。

5.如果測(ce)量電(dian)流(liu)達不到100A，或者(zhe)為零(ling)，則應檢查所(suo)接(jie)回路接(jie)通(tong)狀態是否良好。

6.如(ru)果一次測量時間太(tai)長，電(dian)源(yuan)過熱，會進行自動保護。可將(jiang)電(dian)源(yuan)關閉一段(duan)時間（約10--20分鐘），使電(dian)源(yuan)冷卻，方可重新使用。

7.一次(ci)測量完畢機(ji)器顯示(shi)測試(shi)結(jie)果，此時按保(bao)存鍵保(bao)存。打(da)印鍵打(da)印，按測試(shi)鍵重測。

8必須在開(kai)始測(ce)試前選擇測(ce)試電流(liu)(liu)檔位！ （帶電流(liu)(liu)選擇機(ji)型）

9.兩次測(ce)試時間(jian)間(jian)隔不小于30秒。

10.建議測試(shi)三次取平均值(zhi)（由于表面油污或接觸不良(liang)等導致測試(shi)值(zhi)偏差）。

11、如正在測試過程中電流線斷開，則儀器自動識別后，關斷電流輸出控制，并提示‘請檢查線路’！！！