Adjustable range of output constant voltage: dc 2.5 v-58v (turn down clockwise and turn up anticlockwise). Please turn on the load after adjusting the output voltage to the voltage you need when the output is no-load (when the constant voltage power supply, adjust the constant current to 1.2 - 1.5 times larger than the load current), ^^ Adjustable range of output constant current: 0.1 a-30a (small clockwise and large anticlockwise). First adjust the output voltage with no load (the load voltage in constant current time and space should be 2-3v higher than the load voltage), adjust the constant current to the minimum, then connect the load and input a ammeter in series at the output, and slowly adjust the current to the current you need. ^^ When the input and output voltage is higher than 36V, please pay attention to the safety of power consumption and prevent electric shock. ^^ When working with high current, please tighten the screws of the terminal. ^^ The input and output voltage and current shall not exceed the maximum value during operation to avoid damaging the power supply. ^^ When working at full load for a long time, pay attention to ventilation and heat dissipation to extend the service life of the power supply.