数字电压表（Digital Voltmeter）简称DVM，它是采用数字化测量技术，把连续的模拟量（直流输入电压）转换成不连续、离散的数字形式并加以显示的仪表。传统的指针式电压表功能单一、精度低，不能满足数字化时代的需求，采用单片机的数字电压表，由精度高、抗干扰能力强，可扩展性强、集成方便-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. The traditional single function of Analog voltage meter, low accuracy, can not meet the digital needs of the times based on microcomputer for the digital voltmeter, by the high precision, strong anti-interference, scalability, integration Fang Bian