选用PIC16C72A的AD转换，测量DC400V以下直流电压，仅用很少的元器件就达到要求。防真通过，板子上也成功。附防真和HEX文件。如要测小数点后两位则最大电压只能到99.99V。测小数点后一位则最大电压能到199.9V。-The selection of PIC16C72A AD conversion, measuring DC400V DC voltage, it can meet the requirements of only using few components. Anti truth through, also successfully board. Report of anti truth and HEX files. To measure the two digits after the decimal point is the maximum voltage can only to 99.99V. Measured one after the decimal point is the maximum voltage to 199.9V.