微电流测量仪的设计与制作  

Design and Manufacture of Microcurrent Measuring Circuit

作　　者：孟繁昌 孔志勇 刘雨轩 张秀新 胡浩然 MENG Fanchang;KONG Zhiyong;LIU Yuxuan;ZHANG Xiuxin;HU Haoran(College of Intelligence and Information Engineering,Shandong University of Traditional Chinese Medicine,Jinan,Shandong Province,250000 China)

机构地区：[1]山东中医药大学智能与信息工程学院,山东济南250000

出　　处：《科技资讯》2021年第33期38-41,共4页Science & Technology Information

摘　　要：为了实现对微电流的测量,该文设计了T型电阻反馈网络实现Ⅰ-Ⅴ转换电路,利用3个运算放大器组成的精密线性放大电路以及压控电压源二阶低通滤波电路,三部分为主要结构的测量电路。同时,利用Multisim进行电路仿真、PCB板制作、表盘制作以及实物焊接等,完成实物制作。采集实验数据,最后运用Matlab进行精密度分析,最终测试结果显示具有稳定性好、低漂移、制作价格低廉等优点。In order to realize measurement of micro current,a T-type resistance feedback network is designed to realize theⅠ-Ⅴconversion circuit.The precision linear amplifier circuit composed of three operational amplifiers and the second-order low-pass filter circuit of voltage controlled voltage source are used.The three parts are the main measurement circuit.At the same time,Multisim is used for circuit simulation,PCB board production,dial production and physical welding to complete the physical production.Collect the experimental data,and finally use Matlab for precision analysis.The final test results show that it has the advantages of good stability,low drift,and low production price.

关 键 词：微电流 低漂移 Ⅰ-Ⅴ转换 滤波电路 运算放大器 

分 类 号：TH122[机械工程—机械设计及理论]