（1）基本要求：

a．被测信号的频率范围为1～20kHz，用4位数码管显示数据。

b．测量结果直接用十进制数值显示。

c．被测信号可以是正弦波、三角波、方波，幅值1～3V不等。

d．具有超量程警告（可以用LED灯显示，也可以用蜂鸣器报警）。

e．当测量脉冲信号时，能显示其占空比（精度误差不大于1 ）。

（2）发挥部分

a．修改设计，实现自动切换量程。

b．构思方案，使整形时，以实现扩宽被测信号的幅值范围

-(1) Basic requirements: a. Frequency range of the signal 1 ~ 20kHz, with a 4-bit digital display data. b. Measurement results show the direct use of the decimal value. c. The measured signal can be sine wave, triangle wave, square wave, amplitude 1 ~ 3V range. d. Super-range warning (you can use LED lights display, you can also use the buzzer alarm.) e. When measuring the pulse signal, to show its duty cycle (precision error is less than 1 ). (2) to play a part of a. Modify the design, automatic switching range. b. The idea of ​ ​ the program, so that when the plastic in order to achieve broaden the scope of the measured signal amplitude