在掌握可控脉冲发生器的基础上了解正负脉宽数控调制信号发生的原理。熟练的运用示波器观察实验箱上的探测点波形。掌握时序电路设计的基本思想。-On the basis of mastering the controllable pulse generator, the principle of the digital modulation signal of the positive and negative pulse width is understood. Skilled use of oscilloscope observation of the experimental box on the detection point waveform. Master the basic idea of sequential circuit design.