（此文档为 word 格式，下载后您可任意编辑修改！）基于 51 单片机的高精度数字电压表的设计摘要：随着电子科学技术的进展，电子测量成为广阔电子工作者必须掌握的手段，对测量的精度和功能的要求也越来越高，而电压的测量甚为突出，因为电压的测量最为普遍[1]。本文介绍一种基于 STC89C51 单片机的一种电压测量电路。该电路采纳高精度、双积分 A/D 转换电路 ICL7135，测量范围为直流 0-+5 伏，使用 LED 数码管显示。论文简单介绍了双积分电路的原理、STC89C51 的特点、ICL7135 的功能和应用，重点描述了高精度数字电压表的设计思想，分析了软、硬件各部分电路的工作原理、设计过程和调试过程，最后给出详细的测试数据并且进行了分析。关键词：电压测量；STC89C51；ICL7135；高精度 Abstract: Along with the electronic science technology's development, the method which the electronic surveying into general electron worker must grasp, is also getting higher and higher to the survey precision and the function request, but the voltage survey is prominent really, because voltage survey most universal [1]. This article introduced that one kind based on the STC89C51 monolithic integrated circuit's one kind of voltage measurement electric circuit, this electric circuit uses the ICL7135 high accuracy, the double integral A/D switching circuit, the measuring range directs current 0-+5 volts, uses the LED nixietube to demonstrate. The main text has given software and hardware system's various part of electric circuits emphatically, introduced the dyadic power distribution road's principle, the STC89C51 characteristic, the ICL7135 function and the application..Keywords: Voltage measurement; STC89C51; ICL7135; double integral A / D converter 序言在电量的测量中，电压、电流和频率是最基本的三个被测量，其中电压量的测量最为常常。而且随着电子技术的进展，更是常常需要测量高精度的电压，所以数字电压表就成为一种必不可少的测量仪器 [1]。数字电压表（Digital Voltmeter）简称DVM，它是采纳数字化测量...
