将J3的1、2短接，使IN2处于双极性工作方式，并给IN1输入一个低频交流信号(幅度为±5V)（可接到SW1上，利用连续调节电位器来产生变化的信号），编程采集这个信号数据并在屏幕上显示波形。-1,2 shorted to J3, so that IN2 work in a bipolar manner and to the IN1 input a low-frequency AC signal (in the range ± 5V) (can be received SW1, using a continuous adjustment potentiometer to generate a signal change ), programming the data acquisition and the signal waveform displayed on the screen.