单片机式数字式万用表

《单片机式数字式万用表》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、封面目录1.前言··················································11.1信号测量与分析的意义······························11.2万用表简介········································11.2.1指针式万用表···································11.2.2数字式万用表···································21.3本论文所做的工作···································

2、32.系统设计··············································52.1数字式万用表的设计构思······························52.1.1设计原理·····································52.1.2设计要求·····································52.1.3设计思路·······································52.2数字式万用表的结构设计······························62.3单片

3、机及显示电路····································72.3.1STC89C52单片机简介····························72.3.2数码管显示器的结构及其工作原理··················82.3.374HC573锁存器··································102.3.4显示电路设计···································112.4A/D转换电路的设计·································152.5直流电压测量电路·····

4、······························172.5.1直流电压测量原理·······························172.5.2直流电压测量电路设计·······························182.6直流电流测量电路·································192.6.1集成运算放大器OP07···························192.6.2直流电流测量原理·····························202.6.3直流电流测量电路设计················

5、·········212.7电阻测量电路····································212.8单片机程序设计··································222.8.1KeilC51开发系统····························232.8.2程序主要结构································233电路的搭建及调试·····································273.1电路的搭建······································273

6、.2电路的调试······································283.3测试结果分析······································30总结·················································37致谢·················································39参考文献···············································41附录···································

7、··········1前言1.1信号测量与分析的意义测量是人们认识客观事物，并用数量概念描述客观事物，进而达到掌握事物本质和揭示自然规律的一种手段。在自然界中对任何被研究的客观事物，若要进行定量的评价，均必须通过测量来实现。著名俄国科学家门捷列夫说过：“没有测量，就没有科学”，英国科学家库克也认为：“测量是技术生命的神经系统”，这足以说明了测量对发展现代科学技术所起到的作用是非常重要的。所谓测量，就是被测量和同类标准量进行比较的一个实验过程，而这个参考量可以是直接的，也可以是间接的。列如，天