数字电压表电路设计.doc

数字电压表电路设计 摘要：在电气测量中，电压是一个很重要的参数。如何准确地测量模拟信号的电压值，一直是电测仪器研究的主要内容之一。目前，市场上主要是要使用的电压表有指针式电压表和数字电压表两种。传统的模拟指针式电压表功能单一，精度低，读数的时候也非常不方便，很容易出错，不能满足数字化时代的需求。而数字电压表由于测量精度高，速度快，读数时也非常的方便，抗干扰能力强等优点而被广泛应用。 数字电压表简称DVM（Digital Voltmeter），它是采用数字化测量设计的电压仪表。包括量程转换电路、数据采集电路，模数转换电路及显示电路的具体设计。根据设计要求选用高精度A/D转换器进行数据转换，针对对模拟输入信号的要求，对输入信号进行量程转换并进行调理。通过A/D转换器完成数据转换及传输，是系统的核心内容。阐述了工作原理并对A/D 转换电路、参考电压电路、电路、电路等电路进行具体设计。最后根据软硬件设计方案对系统进行了调试。: MC14433、A/D转换器、CD4511、译码驱动器、MC1413The Design of Digital Voltmeter Abstract：At the electric measurement, the voltage is a very important parameters. How to accurately measure of the analog signal voltage values, has been one of the main contents of the instrument research electrical measurement. At present, the market mainly use pointer type voltmeter and digital voltmeter . Traditional analog pointer type voltmeter single function, low accuracy, reading time also very inconvenient, very easy to go wrong, and cannot satisfy the demand of digital age. While digital voltmeter due to high accuracy, speed, readings are also very convenient, strong anti-jamming capability etc and has been widely used. Digital Voltmeter DVM (as), it is a kind of digital measuring design voltage meter .This design is a voltage measurement circuit based on MC14433 double integral ADC, digital voltmeter is using digital measurement technique, convert the continuous analogue (DC input voltage) into discontinuous, discrete digital form and show it out. This system consists of MC14433 one and a half A/D converter, MC1413 seven- way-DaLin bolton drive arrays, seven segment latch - decoding - drive CD4511, the benchmark MC1403, and total power LED digital tube anode. 199.9 V is highest range of the simple DC digital voltmeter. This paper is the design of DC digital voltmeter for research content. First digital voltmeter is introduced, then tells the hardware circuit design of digital voltmeter. Including range conversion circuit, data acquisition circuit, frequency-field circuit and t