在现代检测技术中,常常需要用数字电压表进行现场检测,将检测到的数据送入到微计算机系统,完成计算、存储、控制和显示等功能。因此,设计了一种实用的液晶显示数字电压表,其不仅能够对直流电压进行测量,还可以方便地进行量程的自动转换、与计算机通信等功能,并在液晶显示器上显示。该液晶显示数字电压表采用AT89S52单片机为控制平台,重点设计了量程自动转换、A/D转换和液晶显示等硬件功能电路和系统软件。现场实验显示,该液晶显示数字电压表具有转换速度快、可靠性高、性能稳定等优点,具有很好的使用价值。%In modern measuring technology,it is often required to conduct site measuring with a digital voltmeter.The data measured will then be input into the micro-computer system to execute such functions like calculating,storing,controlling and displaying.The paper mainly discusses the design principle and chief techniques of a LCD digital voltmeter.The control system of liquid crystal display digital voltmeter described in this paper uses AT89S52 SC computer to fulfill the designing of the software as well as the electrical circuit.It can not only measure the direct voltage with the meter,but also easily carry out the Auto Switch Measure Bound,communicate with PC and display the measurements.
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