基于四线测量法的智能微电阻测试仪设计  

Design of intelligent micro-ohmmeter based on four-line method

作　　者：张朵[1] 许宜申[1] 吴茂成[1] 肖龙飞[1] 周思阳[1] 朱欣华[2] 

机构地区：[1]苏州大学物理与光电.能源学部,江苏苏州215006 [2]南京理工大学机械工程学院,南京210094

出　　处：《电测与仪表》2015年第10期29-34,55,共7页Electrical Measurement & Instrumentation

基　　金：江苏省属高校自然科学研究面上项目(12KJD480001);江苏省产学研前瞻性联合研究项目(BY2012118)

摘　　要：针对低电阻精确测量的应用需求，设计了一种基于四线测量法的智能高精度微电阻测试仪。系统采用模块化设计方式，包括供电电源、恒流源、A／D转换、显示与按键等单元。测试仪采用四线测量法，将电流流入回路和电压测量回路分开接线，并通过在电压提取端设计电压跟随器，使电压测量引线上的电流为零，可避免引线电阻和接触电阻对微小电阻测量的影响，大大提高系统的测量精度。实验测试结果表明：该仪器可以实现1μΩ-2MΩ范围内电阻值的高精度自动测量，同时还具有电阻分选功能，可与自动化生产线相连，完成电阻参数的分选工作。According to the situation of need of accurate micro-ohm measurement, a micro-ohmmeter system based on four-line method is designed.This system adopts modularization design which includes power supply, constant-current source, A/D converter and display with LCD.The accuracy of measurement is apparently improved because the adop-tion of four-line method, which effectively canceled the affect of lead resistance and contact resistance in low resist-ance measurements by separating the current input and the voltage-sensing leads.The high accuracy also results from the design of voltage follower in the voltage-measuring port, making the current in voltage-sensing leads to be zero. The experimental data indicates that the device can realize the resistance measurement within 1μΩto 2MΩautomati-cally.Moreover, the tester has the function of resistance separation, which can be connected to automated production lines for the resistance parameter inspection.

关 键 词：微电阻 四线测量法 恒流源 量程自动转换 

分 类 号：TM93[电气工程—电力电子与电力传动]