能够产生正弦波、方波、三角波。同时还可以作为频率计测频率。函数信号的产生由MAX038和外围电路完成，能产生1Hz—20MHz的波形。波形选择由单片机完成。输出或输入频率经74HC390分频后，由单片机完成自动频率检测显示-Capable of producing sine, square, triangle wave. At the same time can also be measured as a frequency meter frequency. Function signal ge