基于單片機(jī)的數(shù)字電壓表系統(tǒng)設(shè)計(jì)
摘要
數(shù)字電壓表（Digital Voltmeter）簡稱DVM，它是采用數(shù)字化測量技術(shù)，把連續(xù)的模擬量（直流輸入電壓）轉(zhuǎn)換成不連續(xù)、離散的數(shù)字形式并加以顯示的儀表。傳統(tǒng)的指針式電壓表功能單一、精度低，不能滿足數(shù)字化時代的需求，采用單片機(jī)的數(shù)字電壓表，由精度高、抗干擾能力強(qiáng)，可擴(kuò)展性強(qiáng)、集成方便，還可與PC進(jìn)行實(shí)時通信。目前，由各種單片A/D 轉(zhuǎn)換器構(gòu)成的數(shù)字電壓表，已被廣泛用于電子及電工測量、工業(yè)自動化儀表、自動測試系統(tǒng)等智能化測量領(lǐng)域，示出強(qiáng)大的生命力。與此同時，由DVM擴(kuò)展而成的各種通用及專用數(shù)字儀器儀表，也把電量及非電量測量技術(shù)提高到嶄新水平。本章重點(diǎn)介紹單片A/D 轉(zhuǎn)換器以及由它們構(gòu)成的基于單片機(jī)的數(shù)字電壓表的工作原理。

關(guān)鍵詞：數(shù)字電壓表 A/D 轉(zhuǎn)換器 PC 電壓測量

Abstract

Digital voltage meter (Digital Voltmeter) referred to as DVM, it is the use of digital measuring technology, the continuous analog (DC input voltage) into a non-continuous, discrete digital form and to display the instrument.Analog voltage meter features a traditional single, low accuracy, can not meet the digital age, using the single chip digital voltage meter, from the high precision, anti-interference ability, scalability, Ji Cheng convenience, and PC can communicate in real time.At present, by a variety of single A / D converter consisting of digital voltage meter, has been widely used in electronic and electrical measurement, industrial automation, instrumentation, automated test systems, intelligent measurement, showing strong vitality.At the same time, the DVM extension to the various general and specific digital instruments, but also the power and non-power measurement up to a new level.This chapter focuses on single-chip A / D converter, and they form by the microcontroller-based digital voltmeter works.

Keywords: digital voltmeter A / D converter voltage measurement PC
目 錄
1 設(shè)計(jì)方案 6
1.1 A/D轉(zhuǎn)換部分 6
1.2 電源部分 7
2 系統(tǒng)硬件電路設(shè)計(jì) 8
2.1 單片機(jī)芯片 8
2.2 89C51與外圍電路的接口 10
3 詳細(xì)設(shè)計(jì) 14
3.1復(fù)位電路 14
3.2電源電路 16
3.3 程序框圖.......................................................17
3.4 源程序.........................................................19
4 總結(jié) 28
參考文獻(xiàn) 29