摘要
阻抗测试芯片AD5933高度集成化、低成本的特点使其具有解决市场上阻抗仪体积大、成本昂贵等问题的潜力;在分析AD5933存在问题的基础上,研制了基于AD5933的便携式阻抗仪;系统采用S3C2440AL ARM9处理器为控制核心,通过I2C接口控制阻抗测量模块完成测量,并通过触摸屏显示测量结果;硬件上通过设计信号调理电路消除直流分量及输出阻抗的影响,软件上采用全新的校准方法实现阻抗计算以减小存储量及查询量;阻抗测量实验表明,所设计阻抗仪的阻抗模值平均相对误差为0.33%,最大相位误差为4°,满足一般阻抗测量要求;该阻抗仪还具有操作简单、成本低、体积小的优点。
Impedance measurement chip AD5933＇s characteristics of high intergration and low--cost make it psossible to address the huge and high-cost problems of commercialized impedanee instrument. By analysing the existed problems of AD5933, a portable impedance me-ter is designed based on AD5933. This meter uses S3C2440AL ARM9 as microcontorller to control the impedance measurement circuit by IzC interface, and displays results by toueh screen. Signal conditioning circuit is designed to minimize the influence of DC voltage and output impedance, an original method of impedance calculation is developed to decrease the amount of storage and inquiry. This meter shows good performanee in the impedanee measurement experiment and it possesses the advantages of easy operation, low-cost and small in size.
出处
《计算机测量与控制》
北大核心
2013年第4期1090-1092,1108,共4页
Computer Measurement &Control
基金
中美国际科技合作项目(2010DFA31000)
