1This regulated power supply is a simple, accurate DC power source with full indicated power. 2It provides power source for factory maintenance, calibration positions, and can be integrated into test&equipment cabinet. 3It powers the DIY circuit in our work table at home and is also a necessary tool for educational institute particularly for those involve electronics and telecommunications majorities. 4High as 80% power efficiency 5A secondary voltage stabilization circuit through MOS ensuring a superb voltage outputFeatures:Our power supply allows you to have a stable and accurate output as your device or load exactly needed.This regulated power supply is a simple, accurate DC power source with full indicated power.It provides power source for factory maintenance, calibration positions, and can be integrated into test&equipment cabinet.It powers the DIY circuit in our work table at home and is also a necessary tool for educational institute particularly for those involve electronics and telecommunications majorities.High as 80% power efficiencyA secondary voltage stabilization circuit through MOS ensuring a superb voltage outputFull angle protection include overload,overheating, Over voltage, Short-circuit Protection etc.Small size as 3 U high appropriately fit for work station or test equipment cabinet.Specification:Model: STP3005DHVoltage:110v/220v(switchable)Voltage: 110V Plug type: US plugOutput voltage: 0-30v Output current: 0-5ADigital: 4 digital led Working temperature: 0 ~ 40 Relative humidity: 80% Fuse: F5AL, 250VAC VOLTAGE REGULATION Regulation rate: 0.03% + 1mV Load regulation rate: 0.33% Ripple and noise: 3mVrms (5Hz ~ 1MHz); <10Vppm CURRENT REGULATION Regulation rate: 0.1% + 1mA load regulation rate: 0.2% +5mA Ripple and noise: 3mArms Restore: 300ps (with toad of 50% regulation rate, 0.5A) HIGH VOLTAGE Leak current: 1mA (with input 1500VAC/ls to ground) Insulate resistance: 5MQ (with input 500VDC/5s to ground) Temperature: -10 ~ 70C Relative humidity: 70%Size:13*21.5*8.5cm/5.1*8.5*3.3in Weight: Approx.1591g/56.1ozOperation Instruction: (1) Turn the 110V/220V switch at rear panel of power supply to a correct position according to your local voltage standard. (2) Plug into 110V or 220V indoor power source. (3) Use a wire with one end in Ground Port and another end to earth. (4) Press "Power Switch" to turn on the device, Coarsely or fine tune the voltage knob to get a desired voltage to your load. (5) Turn off the power by pressing the "Power Switch", short out "positive connector"and "Negative Connector" with a wire(6) Press " Power Switch'' to turn on the device. Coarsely or fine tune the current knob to get a wanted current. And then remove the wire. (7) Connect a load positive to positive port (green), negative to negative port(black)Package list:1 * Regulated DC Power Supply1 * Power cable 2 * crocodile clip 1 * instruction Note: 1.The device is intended for indoor use only 2.It's very important to turn the power switch (110V/220V) at real panel to 3.a correct position according to your local voltage standard. 4.Do not open repair the device or it will void the warranty. 5.Do not use the device in a damp environment. 6.