数控脉宽脉冲信号发生器：数控脉宽脉冲信号发生器能够在脉宽控制键的控制下，按确定的步长改变输出脉冲信号占空比，即使脉冲宽度可调，同时以占空比的形式显示脉宽情况。-Digital pulse-width pulse generator: NC pulse width pulse width control signal generator able to control key, press OK steps to change the duty cycle of the output pulse

超声波发生器内部结构有两个压电晶片和一个共振板。当它的两极外加脉冲信号，其频率等于压电晶片的固有振荡频时，压电晶片将会发生共振，并带动共振板振动，便产生超声波。-Ultrasonic generator internal structure has two piezoelectric chip and a sounding board. When it is applied bipolar pulse signal having a frequency equal to the natural