一．概述

ZRC-II 型直流電阻測試儀（微歐計）是取代直流單、雙臂電橋的高精度換代產品。儀器采用了先進的開關電源技術，由四位半LCD液晶顯示測量結果，三位半LCD液晶顯示環境溫度或測試電流值，克服了其它同類產品由LED顯示值在陽光下不便讀數的缺點，同時具備了自動消弧功能。本儀器具有測速快、精度高、顯示直觀、抗g擾能力強、體(ti)積小(xiao)、耗(hao)電(dian)(dian)(dian)(dian)(dian)省(sheng)、測(ce)試(shi)數據穩定可(ke)(ke)靠、不受人為因素(su)影(ying)響等優(you)點。是(shi)測(ce)量電(dian)(dian)(dian)(dian)(dian)力變壓(ya)器(qi)等各(ge)種感性負載電(dian)(dian)(dian)(dian)(dian)阻及低壓(ya)開關接觸(chu)電(dian)(dian)(dian)(dian)(dian)阻、電(dian)(dian)(dian)(dian)(dian)線電(dian)(dian)(dian)(dian)(dian)纜或焊縫接口電(dian)(dian)(dian)(dian)(dian)阻的(de)理想儀(yi)器(qi)，其測(ce)量速度比電(dian)(dian)(dian)(dian)(dian)橋快一百多倍。儀(yi)器(qi)內裝可(ke)(ke)充電(dian)(dian)(dian)(dian)(dian)鋰離子電(dian)(dian)(dian)(dian)(dian)池組（12V），交、直流兩用(yong)，便于現場(chang)及野外(wai)測(ce)試(shi)。

二．工作(zuo)原(yuan)理

本儀器(qi)內有(you)一個能產生直(zhi)流電(dian)(dian)(dian)流的(de)；鋰離(li)子可充電(dian)(dian)(dian)池恒流源。在(zai)(zai)測量電(dian)(dian)(dian)阻(zu)時，恒流從I＋、I－端向被(bei)試品饋入恒流，該電(dian)(dian)(dian)流在(zai)(zai)被(bei)測體上產生相應的(de)電(dian)(dian)(dian)壓值，這一電(dian)(dian)(dian)壓值在(zai)(zai)V＋、V－端取回(hui)本機，經放大后，直(zhi)接用四位半LCD數(shu)字顯示被(bei)試品的(de)電(dian)(dian)(dian)阻(zu)值。

三．ZRC-II 型直流電阻測試儀技術指標

使用(yong)條(tiao)件：

環(huan)境溫度：0℃～40℃

相對溫度：≤85％RH

測(ce)量范(fan)圍：1mΩ～20mΩ;20～200mΩ;0.2～2Ω;  20～200Ω;200Ω～2kΩ

測(ce)量精度：０.5級

分(fen)辨(bian)率：1μΩ

恒流源：2A（1uΩ～2Ω）、0.2A(2Ω～200Ω)、0.02A（20Ω～2000Ω）

工作電(dian)壓：直流(liu)12V～16.8V（2.2Ah）鋰離(li)子可充電(dian)電(dian)池(chi)     ; 交流(liu)  220V。

功耗：≤15W

外形尺(chi)寸：335×275×175mm

重量：2.8kg