CAJ | 학술논문

针对小电阻测量准确度的问题，提出了一种四端接入的方案，在待测电阻和参考电阻两端分别提取电压信号，采用前置放大器、双积分AD转换技术和直流比例法来抑制调理电路温漂、失调电压以及电阻负载效应的影响，准确测量流过恒定电流的小电阻上的微小压降，实现了小电阻的精密可靠测量，具有高精度、低功耗、便携性好的特点。
침대소전조측량준학도적문제，제출료일충사단접입적방안，재대측전조화삼고전조량단분별제취전압신호，채용전치방대기、쌍적분AD전환기술화직류비례법래억제조리전로온표、실조전압이급전조부재효응적영향，준학측량류과항정전류적소전조상적미소압강，실현료소전조적정밀가고측량，구유고정도、저공모、편휴성호적특점。
To improve accuracy of small resistance tester,this paper presents a way of four-wire connection method,calculates micro volt-age of measuring resistance by turning to the pre-amplifier,dual integral AD convertor and DC proportion method,minimizes the impact by temperature and offset voltage and resistive load. It realizes precision measuring of small resistances,and has characteristics of high-precision,low power consumption,portability.