在OPEN-SC51单片机系统的基础上实现高精度数字电压表设计，测量电压范围：0～5VDC，精度可达0.001mv。仿真精度达0.001mv电压表 -OPEN-SC51 in the single-chip microcomputer system based on the design of high-precision digital voltmeter, measure voltage range: 0 ~ 5VDC, accuracy 0.001mv.