液體表面電阻率測試儀主要特點

電阻測量(liang)范(fan)圍寬  1×104Ω ～1×1018Ω  

電流測量(liang)范圍為(wei) 2×10-4Ａ ～1×10-16Ａ

體積小、重量(liang)輕(qing)、準確度(du)高

所有(you)測試電(dian)(dian)壓(ya)(10V/50V/100/250/500/1000V) 測試時電(dian)(dian)阻(zu)結果直讀(du)，免去老式高阻(zu)計在(zai)不同測試電(dian)(dian)壓(ya)下或不同量程時要乘(cheng)以系數(shu)等使用(yong)不便的麻(ma)煩，使測量超高電(dian)(dian)阻(zu)就(jiu)如用(yong)萬用(yong)表測量普通(tong)電(dian)(dian)阻(zu)樣簡便。

既能(neng)測超高電(dian)(dian)阻又能(neng)測微電(dian)(dian)流

技術指標

1、電阻測(ce)量范(fan)圍：1×104Ω ～1×1018Ω。

2、電流測量(liang)范圍(wei)為：2×10-4A～1×10-16A

3、顯 示 方 式：32位(wei)LED液(ye)晶屏顯示

4、內置測試(shi)電(dian)壓：10V、50V、100V、250、500、1000V

5、基本準確度(du)：1% (*注)

6、使用環境(jing)： 溫度：0℃～40℃，相對濕度<80%

7、機(ji)內測(ce)試電(dian)壓：10V/50V/100/250/500/1000V任(ren)意切換

8、供電形式：AC 220V，50HZ，功耗約5W

9、儀器(qi)尺(chi)寸：285ｍｍ×245ｍｍ×120 mm

10、質量： 約2.5KG

工作原理

   根據歐姆定律，被測(ce)(ce)(ce)(ce)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)Rx等于(yu)施(shi)加電(dian)(dian)(dian)(dian)(dian)壓(ya)V除以通過的(de)電(dian)(dian)(dian)(dian)(dian)流I。傳(chuan)統的(de)高阻(zu)(zu)(zu)計的(de)工作原理是測(ce)(ce)(ce)(ce)量(liang)電(dian)(dian)(dian)(dian)(dian)壓(ya)V固(gu)定，通過測(ce)(ce)(ce)(ce)量(liang)流過取樣電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)的(de)電(dian)(dian)(dian)(dian)(dian)流I來得到電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)值(zhi)。從歐姆定律可以看出(chu)，由于(yu)電(dian)(dian)(dian)(dian)(dian)流I是與電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)成反比，而不是成正比，所(suo)(suo)以電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)的(de)顯示值(zhi)是非線性的(de)，即(ji)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)無(wu)窮(qiong)大(da)時(shi)，電(dian)(dian)(dian)(dian)(dian)流為零(ling)，即(ji)表頭的(de)零(ling)位處是，其附近的(de)刻度(du)非常密，分辨率很低。整個(ge)刻度(du)是非線性的(de)。又由于(yu)測(ce)(ce)(ce)(ce)量(liang)不同的(de)電(dian)(dian)(dian)(dian)(dian)阻(zu)(zu)(zu)時(shi)，其電(dian)(dian)(dian)(dian)(dian)壓(ya)V也會有些(xie)變化，所(suo)(suo)以普通的(de)高阻(zu)(zu)(zu)計是精度(du)差(cha)、分辨率低。

本(ben)儀器是(shi)(shi)同(tong)時測(ce)(ce)出電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)兩端的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)V和流(liu)(liu)過(guo)(guo)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)I，通過(guo)(guo)內部(bu)的(de)(de)(de)大規(gui)模集成(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)路完成(cheng)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)除以(yi)(yi)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)的(de)(de)(de)計(ji)算，然后把(ba)所(suo)得(de)到(dao)(dao)的(de)(de)(de)結(jie)果(guo)經過(guo)(guo)A/D轉換后以(yi)(yi)數字顯(xian)示出電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)值(zhi)，即(ji)便是(shi)(shi)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)兩端的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)V和流(liu)(liu)過(guo)(guo)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)I是(shi)(shi)同(tong)時變(bian)(bian)化，其顯(xian)示的(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)值(zhi)不象普通高(gao)(gao)阻(zu)計(ji)那(nei)樣因被測(ce)(ce)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)V的(de)(de)(de)變(bian)(bian)化或(huo)電(dian)(dian)(dian)(dian)(dian)(dian)流(liu)(liu)Ｉ的(de)(de)(de)變(bian)(bian)化而(er)變(bian)(bian)，所(suo)以(yi)(yi)，即(ji)使(shi)測(ce)(ce)量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)、被測(ce)(ce)量(liang)電(dian)(dian)(dian)(dian)(dian)(dian)阻(zu)、電(dian)(dian)(dian)(dian)(dian)(dian)源電(dian)(dian)(dian)(dian)(dian)(dian)壓(ya)等發生變(bian)(bian)化對其結(jie)果(guo)影響(xiang)不大，其測(ce)(ce)量(liang)精度很高(gao)(gao)，從(cong)理論上講其誤差(cha)可以(yi)(yi)做到(dao)(dao)零(ling)，而(er)實際誤差(cha)可以(yi)(yi)做到(dao)(dao)千分之(zhi)幾(ji)或(huo)萬分之(zhi)幾(ji)。

液體表面電阻率測試儀

操作方式：

1、電流先手動調零

2、調整測試電壓

3、旋轉電阻波蕩(dang)觀(guan)察數值

4、讀取電阻值

5、根據電阻值按以下(xia)公式(shi)求出

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