steps:1. to supply;2.Press switch for 10second to switch Normal mode and Precise mode;3.Short press switch to set frequency and change value by rotating switch;4.Press switch for 2second to set duty cycle; 5.Keep press for 5second to lock set parameters; 6.Test;7.Press button 'ON/OFF' to turn on or off PWM output; 8.Remove and load to module. XY-KPWM signal generator is a device provides electrical signals at a variety of frequencies, wave, and output levels.It is used as a signal source or excitation source for testing.Widely used in production practice and technology. 1.With outer casing 2.LCD high definition display 3.Support UART 4.Support frequency adjustment 5.Support duty cycle adjustment 6.High detection 7.Support - memory function 8.1-Channel PWM output 9.Dual Work Mode 10.Knob supports lock function to avoid misoperation 11.Support enable output Parameters: 1.Product name: XY-KPWM PWM Signal Generator; 2.: XY-KPWM; 3.Work Voltage:DC 3.3V-30V; 4.Frequency range(Normal mode):1Hz~150KHz; 5.Frequency range(Precise mode):1Hz~15KHz; 6.Frequency accuracy:2%; 7.Duty cycle accuracy:1% at Normal mode; 8.Duty cycle accuracy:0.1% at Precise mode; 9.Duty cycle range:0.00%-100%; 10.Output Current:About 5-30mA; 11.Output amplitude: to input voltage; 12.Work Temperature:-40 Celsius~85 Celsius 13.Work Humidity:0%~95%RH; Application: 1. wave signal generator, generating wave signal for experimental development; 2.Used to generate a wave signal controls the motor driver; 3.Generate adjustable pulses for by the MCU; 4.Dimmer; 5.Speed governor; colour:black Material:plastic size:71*39mm Package Contents: 1*Signal generator Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.