基于CR302A电容触控式自动电阻测量装置研究  

Research on CR302A capacitive touch automatic resistance measuring device

作　　者：苏宏锋[1] Su Hongfeng(Sichuan Vocational and Technical College of Communications,Chengdu 611130,China)

机构地区：[1]四川交通职业技术学院,成都611130

出　　处：《电子测量技术》2021年第3期155-159,共5页Electronic Measurement Technology

基　　金：四川交通职业技术学院科技教育发展基金项目(2020-XY-KJ-05)资助。

摘　　要：针对目前电阻测量仪器采用机械旋转换挡,不支持自动换挡测量与电阻筛选的问题,研制了一种电容触控式自动电阻测量装置。装置以STC12C5A60S2单片机为主控平台,采用GM3400 NMOS场效应管与标准精密电阻组成挡位切换电路,CR302A电容触摸电路用于系统工作模式与测量参数的设置,LCD12864液晶屏显示电阻测量与电阻筛选结果。为了提高电阻测量精度,提出一种ADC软件补偿算法。试验结果表明,该装置实现了0~10 MΩ范围的电阻自动换挡测量与电阻筛选,电阻测量误差小于0.41%,电阻筛选功能稳定,准确性高。The current resistance measurement devices use mechanical rotary shifting.It does not support automatic shift measurement and resistance screening functions.The paper develops a capacitive touch automatic resistance measurement device. The device is based on STC12 C5 A60 S2 single-chip microcomputer as the main control platform. It uses GM3400 NMOS field effect tube and standard precision resistance to form a gear switching circuit. CR302 A capacitive touch control circuit realizes the setting of system working mode and measurement parameters.LCD12864 screen displays resistance measurement and resistance screening result. In order to improve the accuracy of resistance measurement, an ADC software compensation algorithm is proposed. The test results show that the device realizes the resistance automatic shift measurement and resistance screening function in the range of 0~10 MΩ. The error rate is less than 0.41%.The resistance screening function is stable, and the accuracy is high.

关 键 词：电阻测量 自动换挡 电容触控式 电阻筛选 NMOS场效应管 ADC软件补偿算法 

分 类 号：TN98[电子电信—信息与通信工程]