目录
1 前言.................................................................................................................................................................3
1.1 电子测量概述......................................................................................................................................3
1.2 数字电压表的特点.............................................................................................................................3
1.3 单片机的概述......................................................................................................................................4
2 系统方案的选择与论证.................................................................................................................................5
2.1 功能要求..............................................................................................................................................5
2.2 系统的总体方案规划.........................................................................................................................5
2.3 各模块方案选择与论证.....................................................................................................................6
2.3.1 控制模块....................................................................6
2.3.2 量程自动转换模块..........................................................6
2.3.3 A/D 转换模块...............................................................7
2.3.4 显示模块....................................................................7
2.3.5 通信模块....................................................................7
3 系统的硬件电路设计与实现........................................................................................................................8
3.1 系统的硬件组成部分.........................................................................................................................8
3.2 主要单元电路设计.............................................................................................................................9
3.2.1 中央控制模块...............................................................9
3.2.2 量程自动转换模块..........................................................9
3.2.3 A/D 模数转换模块........................................................14
3.2.4 显示模块...................................................................16
3.2.5 通信模块...................................................................16
3.2.6 电源部分...................................................................17
4 系统的软件设计...........................................................................................................................................18
4.1 软件的总体设计原理.......................................................................................................................18
4.1.1 A/D 转换程序设计........................................................19
4.1.2 数字滤波程序设计........................................................20
4.1.3 量程自动转换的程序设计................................................22
5 系统调试与性能分析...................................................................................................................................24
5.1 调试与测试........................................................................................................................................24
5.2 性能分析............................................................................................................................................24
6 结束语...........................................................................................................................................................25
6.1 设计总结............................................................................................................................................25
6.2 设计的心得........................................................................................................................................25
7 致词...............................................................................................................................................................26
附录..................................................................................................................................................................27
附录 1 参考文献......................................................................................................................................27
附录 2 系统总电路图..............................................................................................................................28
附录 3 源程序..........................................................................................................................................30
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