全自动电压表的设计

文档编号:JD881  附开题报告,任务书,原理图,PCB,外文翻译,文档字数:17422,页数:36

摘 要：仪器仪表是获取信息的工具，是认识世界的手段。它是一个具体的系统或装置。它最基本的作用是延伸、扩展、补充或代替人的听觉、视觉和触觉等器官的功能。随着科学技术的不断发展，人类社会已步入信息时代，对仪器仪表的依赖性更强，要求也更高。
本文所设计的是一个自动换挡的电压表，控制系统采用Atmel公司的AT89S52单片机，A/D转换器采用ADC0809为主要硬件，采用74LS138芯片结合继电器实现自动换挡的功能。该系统的数字电压表电路简单，所用的元件较少，成本低，调节工作可实现自动化。可以测量0——200V的输入电压值，并在八位LED数码管上将测量结果显示出来。
仿真结果表明，最大量程200V，误差小于3%，并可以根据实际被测电压的大小自动转换量程。
关键词：仪器仪表；自动换挡；数字电压表；误差

The Design of Automatic Voltage Meter

Abstract：Instrument is a tool to obtain information and it is a mean of understanding the world. It is a specific system or device. Its basic function is extension, expansion, supplement or replacing with people’s hearing, visual, tactile and other organ functions. With the continuous development of science and technology, human society has entered into the information age, the stronger the dependence of instrument, the higher it demands.
This article designs a automatically shift voltage meter，the control system adopts a single-chip AT89S52 of Atmel Corporation and the ADC0809 used as the main A / D converter hardware. It achieves the functions that automatic shift through  the combination of 74LS138 chips and relay .The system’s digital voltage meter circuit is simple, fewer components are used , low in cost and regulation work can be achieved automatically. It can measure 0 - 200V input voltage value and display the measurement results on 8 LED digital tube.
The simulation results show that the largest range is 200V, the error is less than 3% and can be automatically convert voltage range in accordance with the actual size of the voltage.
Key words: Instrumentation; Automatic Power Shift; Digital Voltage Meter; Error

摘 要 I
Abstract II
目录 III
1绪论 1
1.1课题背景与意义 1
1.2国内外发展现状 1
2总体分析与设计 1
2.1课题分析 1
2.2方案论证 2
3 硬件电路设计 3
3.1各模块电路的设计 4
3.1.1电压输入调理电路的设计 4
4 软件设计 20
4.1软件的总体设计 20
4.2 Keil C51介绍 20
4.3系统子程序的设计 21
5 系统仿真与调试 25
5.1 Protus系统仿真环境 25
5.2 系统仿真 26
5.3遇到的问题及解决方法 28
6 展望 29
参考文献 30
致谢 31

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