【关键词】模数转换；自动量程转换；INA114；电阻；MCU；液
晶显示；
目 录
1.1 设计要求...........................................................................................................4
1.1.1 任务.........................................................................................................4
1.1.2 要求.........................................................................................................4
1.2 总体方案...........................................................................................................5
1.2.1 方案论证与比较.....................................................................................5
1.2.2 系统组成.................................................................................................6
二、理论计算与电路分析............................................................................................6
2.1 电阻测量原理..........................................................................................................6
2.2.1 测量电路.................................................................................................6
2.1.2 基准电压电路.........................................................................................7
2.2 自动量程转换与筛选的设计...........................................................................8
2.2.1 自动量程转换.........................................................................................8
2.2.2 筛选功能................................................................................................8
2.3 电位器阻值变化曲线装置的设计...................................................................9
3.1 电路设计与分析...............................................................................................9
3.1.1 电源模块................................................................................................9
3.1.2 测量与转换模块...................................................................................10
3.1.3 控制显示模块.......................................................................................10
3.1.4 辅助装置...............................................................................................11
3.2 程序流程图设计.............................................................................................12
四、 系统测试方案与结果.........................................................................................14
4.1 测试条件.........................................................................................................14
4.2 测试方案.........................................................................................................14
4.3 测试结果与分析.............................................................................................14
五、 结论和系统特色.................................................................................................15
一、 系统方案
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