ITEM NAME:Adjustable Signal Generator FNIRSI-PWM PWM Pulse Frequency Duty Cycle Module LCD Product Description Description: FNIRSI-PWM Signal Generator is a device that provides electrical signals at a variety of frequencies, square wave, and output levels. It is used as a signal source or excitation source for testing. Widely used in production practice and technology. Package list: 1*Â FNIRSI-PWM Signal Generator If you have any uncertainty or feel confused about the item, please feel free to.FNIRSI-PWM Signal Generator is a device that provides electrical signals at a variety of frequencies, square wave, and output levels. It is used as a signal source or excitation source for testing. 1 FNIRSI-PWM Signal Generator.