目录
1 前言 ............................................................................................................................................................2
1.1 电子测量概述 .................................................................................................................................2
1.2 数字电压表的特点 .........................................................................................................................3
1.3 单片机的概述 .................................................................................................................................3
2 系统方案的选择与论证 ............................................................................................................................4
2.1 功能要求 .........................................................................................................................................4
2.2 系统的总体方案规划 .....................................................................................................................5
2.3 各模块方案选择与论证 .................................................................................................................5
2.3.1 控制模块 .....................................................5
2.3.2 量程自动转换模块 .............................................6
2.3.3 A/D 转换模块..................................................6
2.3.4 显示模块 .....................................................6
2.3.5 通信模块 .....................................................7
3 系统的硬件电路设计与实现 ....................................................................................................................7
3.1 系统的硬件组成部分 .....................................................................................................................7
3.2 主要单元电路设计 .........................................................................................................................8
3.2.1 中央控制模块 ................................................8
3.2.2 量程自动转换模块 ............................................9
3.2.3 A/D 模数转换模块............................................13
3.2.4 显示模块 ...................................................15
3.2.5 通信模块 ...................................................15
3.2.6 电源部分 ...................................................16
4 系统的软件设计 ......................................................................................................................................17
4.1 软件的总体设计原理 ...................................................................................................................17
4.1.1 A/D 转换程序设计............................................18
4.1.2 数字滤波程序设计 ...........................................18
4.1.3 量程自动转换的程序设计 .....................................20
5 系统调试及性能分析 ..............................................................................................................................22
5.1 调试与测试 ...................................................................................................................................22
5.2 性能分析 .......................................................................................................................................22
6 结束语 ......................................................................................................................................................23
6.1 设计总结 .........................................................................................................................................23
6.2 设计的心得 .....................................................................................................................................23
7 致谢词 ......................................................................................................................................................24
附录 ................................................................................................................................................................25
附录 1 参考文献 ...................................................................................................................................25
附录 2 系统总电路图 ...........................................................................................................................26
附录 3 源程序 .......................................................................................................................................27
