Product description: The series of switching power supplies for measuring instrument have ruled out the inconvenience of big volume and heavyweight of a traditional power supply possess. The output voltage and current is controlled by two variable resistors regulation for more handy and precise adjustment. Feature: With more extensive range of input voltage. With high frequency operation can reduce the size of power transformer . With small size , light weight and high density power . Entire efficiency rate higher up to 70% Zero adjustment for the output of voltage and current Specifications Model: NPS306W Input powerAC 220V, 50Hz Output voltage: 0-30Vfor NPS306W Output current: 0-6A for NPS306W Output power: 180W for NPS306W working temperature0 - 40 ; relative humidity: < 80% RH Storage temperature-10 ~ 70 ; relative humidity: < 70% RH Constant Voltage Operation: Voltage stability0.1% 3MV Load stability: 0.2% 3MV Ripple voltage: 0.5% Vp-p Continuously adjustable from 0 to rated voltage Constant Current Operation: Current stability: 0.1% 3mA Ripple current: 0.5% Vp-p Recovery time: 500 s Temperature coefficient: 100ppm / 0 to rated current continuously adjustable Head display : Three window digital tube display: voltage, current, power Display accuracy: 0.5% + 3 words Display staging rate: voltage 0.1V, current 0.01A, power 0.1w/1w product size: 70 (W) x 130 (H) x 230 (L) mm Package size: 110 (W) x 170 (H) x 290 (L) mm N.W: 1.3KG G.W: 1.6kg Packing List 1 x DC power supply 1 x power cord 1 x output line 1 x operation manual