说明：  用C51单片机做的防盗报警器测试程序,主要实现AC/DC电压测试,频率测试,电流测试,正弦信号发生,数字IN/OUT等功能!
(C51 microcontroller do with the anti-theft alarm testing procedures, main AC/DC voltage testing frequency of testing, current tests, sinusoidal signal, digital IN/OUT function!)