一种程控高精度电阻测量仪的设计  

Design of high-precision resistance measuring instrument

作　　者：阮玮琪 赵益波[1] 于步云 刘恒[1] 

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044

出　　处：《信息技术》2015年第8期40-43,共4页Information Technology

基　　金：江苏省自然科学基金项目(BK20131001);江苏省高校自然科学研究基金项目(13KJB51001719);江苏省大学生实践创新训练计划项目资助(201410300023;201410300028)

摘　　要：针对电阻的精密测量需求,设计了一种高精度电阻测量仪,系统由恒流源模块、仪表放大器模块、档位控制模块电路和模拟-数字转换电路四部分组成。恒流源模块主要由OPA376精密运算放大芯片组成,仪表放大器模块主要由INA826精密仪表放大芯片组成,档位控制电路由单片机控制实现三个档位切换,模拟-数字转换电路由16位模拟-数字转换芯片ADS1118组成。硬件测试表明：在电阻值为50Ω~50kΩ范围内,测量相对误差小于0.05%。A high-precision resistance measuring instrument was designed for resistance precision measurement. This system consists of four parts,the constant current source module,the instrumentation amplifier module,gear control module circuit and analog-digital conversion circuit. Constant current source module is mainly composed of OPA376 precision operation amplifier chip, instrumentation amplifier module is mainly composed of INA826 precision instrumentation amplifier chip,gear control switch circuit is controlled by MCU to realize three gear,analog-digital conversion circuit is composed of16 bit ADS1118 analog-digital conversion chip. The hardware test shows that the relative measurement error is less than 0. 05% in the resistance value of 50Ω ~ 50kΩ range.

关 键 词：电阻测量 可调恒流源 模拟-数字转换 程控 

分 类 号：TN911.71[电子电信—通信与信息系统]