这是一段关于用89C51单片机和AD芯片做定标电压表的源程序，使用者如果想要做一个电子电压表的话，可以参考这段程序。-This is a paragraph on the SCM and AD using 89C51 chip calibration voltage meter to do the source, the user if they want to do an electronic voltage meter, you can refer to this procedure.