Use steps:1.Connect to power supply;2.Press rotary switch for 10second to switch Normal mode and Precise mode;3.Short press rotary switch to set frequency and change value by rotating switch;4.Press rotary 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 power and connect load to use module.XY-KPWM signal generator is a device that provides electrical signals at a 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.1.With outer casing2.LCD high definition display3.Support UART4.Support frequency adjustment5.Support duty cycle adjustment6.High precision detection7.Support power-down memory function8.1-Channel PWM output9.Dual Work Mode10.Knob supports lock function to avoid misoperation11.Support enable outputParameters:1.Product name: XY-KPWM PWM Signal Generator;2.Model: 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:Same to input voltage;12.Work Temperature:-40 Celsius~85 Celsius13.Work Humidity:0%~95%RH;Application:1.Square wave signal generator, generating square wave signal for experimental development;2.Used to generate a square wave signal that controls the motor driver;3.Generate adjustable pulses for use by the MCU;4.Dimmer;5.Speed governor;colour:blackMaterial:plasticsize:71*39mmPackage Contents:1*Signal generatorOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.