本程序重要学习电压测量，用户可以选择两种电压测量，

　　1：外部电压测量：短路SW7（CH1输入）SW8（CH0）的2/3脚跳线帽，最多可同时以输入两组电压，或者单独CH0/CH1，（必须有有地线连接到本板的GND端才有效），通过1602液晶显示屏可以看带输入电压多少，具体最高极限请参考DAC0832的说明。

2：内部电压测量，短路SW7/SW8的1/2脚，调整KT3/KT4可调电阻，就可以看到1602液晶上的电压在变化，原则上从0-5V变化-Learn voltage measurement of the program, the user can choose between two voltage measurements: external voltage measurement: short circuit SW7 (CH1 input) SW8 (CH0) 2/3 foot jumper cap up to enter two sets of voltage or separate CH0/CH1 (must have a ground connection to the GND terminal of the board to be effective) through 1602 LCD display can be seen with the input voltage how much specific upper limit, please refer to the descr iption of DAC0832. 2: Internal voltage measurements, short-circuiting SW7/SW8 1/2 feet, adjusting KT3/KT4 adjustable resistors, the voltage changes on the LCD 1602 can be seen, in principle, vary from 0-5V