一种新型数字式电工仪表的设计摘 要数字仪表是把连续的被测模拟量自动的变成连续的、用数字编码方式并以十进制数字自动显示测量结果的一种测量仪表。数字仪表是将电子技术、算机技术自动化技术与精密电测量技术密切地结合在一起的一种新型仪表。数字万用表(DMM)是指可以直接测量电流、电压、电阻或其他电参量数的仪表,其功能可以任意组合并以十进制数字显示被测量结果,应用十分广泛。在传统的电工电子测量中广泛使用的模拟量仪表,虽然具有观察者可直观看出表针偏转了多少个格和满刻度百分之几的优点,但要对读数加以换算和说明,尤其不可避开的是带来认为的视差,不同的观察者会得出不同的结果。数字仪表则不同,将测量结果直接用数字显示出来。然而要将模拟测量结果用数字显示出来首先要解决的是如何将模拟量转换成数字量再加以显示。本论文以 MCS-51 系列单片机为核心,通过 ADC0809 模数转换器实现对模拟电路中的电流,电压测量结果转换成数字信号并用十进制数值显示。本设计采纳程序推断方法,选取不同的电阻组合自动选择模拟量通道。实现再测量过程中自动选择仪表量程,并可以实现对功率。功率因数的测量。关键字 单片机 A/D 转换器 数字仪表New electrical instrument designAbstractDigital instrument is measured by the continuous analog automatic into continuous, using digital coding way and with a decimal number automatically measuring results of a meter. It is a new kind of instrument. The electronic technology, computer technology and automation technology and precision electric measurement technology closely together, become a unique instrument technology branch. Digital multimeters (DMM) refers to direct measurement of the current, voltage, resistance or other electrical parameters of the instrument, the number of combinations can function with the decimal digits display by measuring results, widely used. In the tradition of electrical and electronic measurement is widely used in the analog meter, although has the observer can see how an anlaogue display deflection and the full scale, but the advantages of...