基于STM32和AD5933的多通道阻抗测量仪的设计与实现

Design of Multichannel Impedance Meter Based on AD5933 and STM32

摘要:

针对目前传统使用的阻抗测量仪通道少、精度低、操作复杂等诸多缺点,研制了一款测量阻抗范围0~10MΩ、支持USB总线的全自动多通道阻抗测量仪;系统采用STM32F103C8T6处理器为控制核心,高精度阻抗转换芯片AD5933为测量核心,通过上位机设置AD5933配置参数即可完成多通道的单频、多频自动化测量,阻抗数据经USB总线传输至上位机存储及图形方式显示;结果表明该测量仪电路集成度高,操作简单,而且测量相对误差小于1%,性能稳定可靠。

Abstract:

Aiming at the traditional impedance measurement instrument channel less, low precision, operation complex, and many other disadvantages. Developed a automatic multi-channel impedance meter measuring impedance range 0~10 MΩ, supported USB bus. System adopted STM32F103C8T6 processor as the control core , high precision impedance conversion chip AD5933 as measuring core. AD5933 through the PC configuration parameters can be set up multi-channel single-frequency, multi-frequency automated measurement. Impedance data through the USB bus transmitted to PC storage and graphics display. Results shows that the measuring instrument highly integrated circuits, easy operation, and measuring the relative error is less than 1%, stable and reliable performance.