数字式R、L、C测量仪的设计毕业设计.doc

数字式R、L、C测量仪的设计
任浩伟
(陕西理工学院物理与电信工程学院电子信息工程专业,20011级1班,陕西汉中 723003)
指导教师:梁芳
[摘要]本设计以AT89C52单片机为核心,利用555多谐振荡原理,设计并制作了一个电阻、电感、电容测试仪。把模拟量转换成频率用单片机测量频率,易测量,且便于使仪表实现自动化,测量精度也高。单片机构成的应用系统有较大的可靠性。在电阻、电容、电感测试系统中,用LED来显示测量结果,既简单又显而易见。该设计不仅能够快速、自动测量,而且能够在LED上显示结果。经测试,该系统性能稳定,测量精度高,符合设计要求。
[关键词] AT89C52;555定时器;频率计
Design of Digital Resistance, Inductance, Capacitance Tester
Ren Haowei
(Grade 11,Class 1,Major electronics and information engineering,School of physics and electrical engineering,Shaanxi University of Technology,Hanzhong 723003,Shanxi)
Tutor: Liang Fang
[Abstract] This design takes the AT89C52 microcontroller as the core, uses the 555 multi - harmonic oscillation principle, designs and makes a resistance, inductance, the capacitance tester. The analog quantity is converted into the frequency of the frequency measurement, easy to measure, and easy to make the instrument automatic, and the measurement accuracy is also high. The application system of the monolithic integrated circuit has the big reliability. In the resistance, capacitance and inductance of the test system, LED is used to display the results, which is simple and obvious.. The design can not only be quick and automatic, but also can display the results on LED.. After testing, the system performance is stable, the measurement accuracy is high, and it accords with the design requirement.
[Key words] 555 Timers;AT89C52;Frequency meter
目录
引言 1
1任务分析与方案确定 2
2
2
2
3
4
2系统硬件设计 5
电阻测量部分 5
5
7
电容测量部分 9
9
9
电感测量部分 10
10
11
通道选择部分 13
显示部分 13
15
3系统软件设计 18
18
测频模块 19
4系统安装与测试 21
21
22
5结论 23
致谢 24
参考文献 25
附录A 英语科技文献原文及其翻译稿 26
附录B 电路总图 35
附录C 元器件清单 36
附录D 源程序 37
引言
随着电子技术的发展,电子元器件急剧增加。在应用中我们常常要测定电阻、电容、电感的大小。另外,随着测量技术的飞速发展,测量仪器的已趋向于小型化和智能数字化。而且采用微控制器技术构成的电子系统比传统测量方式有无法比拟的优越性。目前教学实验中普遍采用的数字式万用表对于阻