Shenzhen Mei Chong Instrument adjustable DC switching power supply series is a novel structure, beautiful appearance, compact and lightweight products overall. Its unique structure is similar to the block makes it easy to extend the single-channel and multi-channel. It can be continuous full load output, the output voltage and current in the standard range continuously adjustable. DC power supply than is generally difficult to achieve the high stability, strong reliability and durability of power supply, scientific research departments, universities and enterprises, institutions and individuals interested in the maintenance of laptops and other high stability Ideal for DC power supply's degree. Model: MCH-K302D MCH-K303D MCH-K305D input voltage 110V / 220VAC, 60Hz / 50Hz (when ordering) Output voltage range 0-30V 0-30V 0-30V output current range of 0-2A 0-3A 0-5A voltage Display Accuracy ± 0.5% Current Display Accuracy ± 0.5% efficiency> 85% voltage adjust the load adjustment of (10-100%) 50mV 50mV 50mV line voltage adjustment degree (200-240VAC) 20mV ripple and noise (PP) 30mV 50mV 50mV current regulation Load adjustment degree (10-100%) 20mA adjustment of line voltage (200-240VAC) 20mA ripple and noise (PP) 20mA other operating environments -10 ℃ to + 60 ℃ / 30% RH to 90% RH dimension 22 (D) x 7 (W) x 16 (H) cm Weight About 2kg 3.1 Control Panel (1) Power switch. (2) three LED voltage display. (3) three LED current display. (4) C.V constant pressure indicator. (5) C.C constant lamp. 3 Note: When the load current (Calculated according to Ohm's law) is below a preset current values, CV lights, then the power supply is operating in constant voltage mode. Conversely, CC lights, then the power supply is operating in constant current mode, is defined by the preset current value of the power load. (6) an output terminal. (7) Current adjustment knob. (8) The voltage adjustment knob. 3.2 Operating output port connection: The standard test dedicated lines, the red insert "+" port, insert the black "-" port. Setting constant voltage: Keep the test leads open, adjusting the voltage knob to achieve the desired voltage. Setting constant current: the position of voltage and current value of small knobs convention, short-circuit test lead, adjust the current knob to obtain the desired current. Fourth, accessories and maintenance 4.1 Accessories: Power line; an instruction manual; a fuse; (built at the receptacle) 4 4.2 Note: 1, when the supply voltage is normal, after boot does not light or CV figures do not show bright, probably blown fuse or power cable poor contact and other problems, turn off the power, unplug the power cord, check the power cord to a power plug socket is good contact, or to check whether the fuse has blown. 2, as the voltage source use, the output voltage value is less than the set voltage value and CC lights, current protection, the unit automatically switches to the steady flow of work state, you should check the load or the load to increase the output current. 3, as a steady flow source used, the output current is less than set current value and CV lights, open circuit voltage protection, the unit automatically switches to the regulation state, and you should check the load or increase the voltage based on usage. 4, when power usage, job insecurity, the machine may be less than the rated voltage of the AC input voltage is less than 90%. Check the power supply voltage is within the rated range. Such as in the range and the fault can not be solved, contact your local dealer as soon as possible. Power to a US election will purchase it! - - 20 years of quality assurance, a US-produced MCH Shenzhen Mei Chong Instrument Co., Ltd. | Shenzhen Mei Chong Instrument adjustable DC power supply