30V 5A 220V KA3005P Precision Adjustable Digital Programmable Switching DC Power Supply for Laboratory Testing Modle Phone      Feature:     Compact Design     Dual 4 Digit LED Displays     Digital Controls     Lock feature to prevent accidental changing of set parameters     Circuit protection for over load, short circuit and over temperature.     Automatic switching between mA and A display     Quiet variable speed fan           This has an easy to read 4 digit LED is used to display the voltage and current values.     This is a heavy duty single-channel, constant-voltage and constant-current Linear power supply with low ripple and noise, high reliability and high accuracy.     The voltage and current are continuously adjustable.     It is designed for use in labs, colleges and in production.     This unit is priced about the same as lower cost 3 digit power supplies.           Operating Conditions:     Input voltage: 220V  +/-10%       Frequency range: 50- 60Hz     Operating temperature: 32-104 F  (0-40 ºC)     Operating humidity: < 80%RH     Storage temperature: 32-158 F  (0-70 ºC)     Storage humidity: < 70%RH                 Stable Voltage:     Output Voltage Range: 0-30V Continuously adjustable     Setup Resolution: 10 mV     Setup Accuracy: <0.05% +20 mV     Ripple: < 1mVRMS      Read back Accuracy: 10 mV     Temp. Coefficient: < 0.1% + 10mV     Read back Temp. Coefficient: < 100 ppm+10 mV           Stable Current:     Output Current Range: 0-5A  Continuously adjustable      Setup Resolution: 1 mA     Setup Accuracy: <0.1% +3 mA     Ripple: < 3mARMS      Read back Accuracy: 1 mA     Temp. Coefficient: < 0.1% + 5mA     Read back Temp. Coefficient: < 100 ppm+5 mA