数字电容测量仪的设计

论文编号:JD186   字数:8399,页数:30   

摘要:论文是用单片机AT89C52设计一个方便、简单的带有数字显示功能的电容测量仪器。电容的参数在测试过程中随时可以改变，经过调试表明，已设计的电容测量仪在性能和结构上均达标，具有一定的运用价值。

关键词:电容：数字显示：电容测量仪

Abstract：SCM AT89C52 paper is used to design a convenient, simple digital display with capacitive measuring instruments. Capacitance of the parameters in the course of testing can be changed at any time, after commissioning shows that the capacitors have been designed for measuring the performance and structure of both standards, the use of a certain value.

Keywords：capacitance：figures show that capacitance measuring instrument    

目  录
引言.....................................................................1
设计任务.................................................................1
1.1论文选择目的..........................................................1
1．2 设计要求............................................................1
2．设计方案对比分析......................................................2
3．设计原理和原理图......................................................2
3.1设计原理..............................................................2
3.2原理图................................................................5
3.2电路图................................................................4
4．元件工作原理以及引脚介绍..............................................6
4.1 液晶显示器 LCD 1602..................................................6
4.2 电压比较器 LM 339....................................................7
4.3 译码器 74LS138.......................................................8
4.4 地址锁存器 74HC573...................................................9
4.5 单片机 AT89C52......................................................10
5．电路制作及调试.......................................................11
5.1 程序流程图..........................................................11
5.2 系统的调试..........................................................13
5.3 遇到的问题与解决....................................................14
5.4 附加功能简述........................................................14
6．小结.................................................................15
参考文献................................................................16
附录一（源程序..........................................................17
附录二（元件参数说明....................................................22
附录三（电路补充说明....................................................26
致谢....................................................................27