th.2023.01.005]
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一种微小电阻测试系统的设计

《工业仪表与自动化装置》[ISSN:1000-0682/CN:61-1121/TH]

Author(s):: DUAN Wen; Xi ’an Jiaotong University City College，Department of Electrical and Information Engineering，Shaanxi Xi ’an 710018，China

Keywords:: micro-resistance test; kelvin four-wire detection method; weak signal; least squares method

摘要:: 为了精确测试微小电阻，基于开尔文四线检测法，设计了一种精度较高的微小电阻测试系统。设计方案为：微小电阻施加稳定恒流源信号后，通过采用AD8221为核心的一级放大电路、巴特沃斯二阶有源低通滤波和二级放大电路，获取放大、去噪、平稳的电压信号，经由ADC采集转换后显示被测电阻的阻值。采用最小二乘法拟合曲线对系统测试数据进行误差分析，显示误差小于0.2%，表明该系统测量精度高，可用于精准测量微小电阻以及微弱信号调理放大的场合。

Abstract:: In order to accurately test the micro-resistance, based on the Kelvin four-wire detection method, a high-precision micro-resistance test system is designed.The design scheme is: after applying a stable constant current source signal on the tiny resistor, the first-stage amplifier circuit with AD8221 as the core, the Butterworth second-order active low-pass filter and the second-stage amplifier circuit are used to obtain amplification, denoising, and smoothness. The voltage signal is collected and converted by the ADC to display the resistance value of the measured resistor.The least squares fitting curve is used to analyze the error of the system test data, and it shows that the error is less than 0.2%, indicating that the system has high measurement accuracy and can be used for precise measurement of small resistances and weak signal conditioning and amplification occasions.

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备注/Memo:: 收稿日期：2022-08-02
第一作者：
段雯，（1984），女，陕西省周至人，硕士，工程师，从事电子技术和仪器仪表与自动化检测技术的实验教学及科研工作。

更新日期/Last Update: 1900-01-01