1,Before use switching power supply, make sure the input voltage specifications (110VAC or 220VAC, 24VDC or 48VDC ...) if it matches to the nominal value of the switching power supply.

2, Before power on, please check if the input and output cable is connected right, so as not to damage the user's device.

3, Check mounting screws have any contact with the power board or not , measuring shell and the input and output Insulation resistance, to avoid electric shock.

4, In order to ensure the safety and reduce the interference, ensure reliable grounding ground (earth wire is greater than AWG18 #).

5, Multi-output switching power supply have the main output and auxiliary output, the main output characteristics is better than that of  auxiliary output .In general, the one which has bigger output current is the main output. To ensure that the output load regulation and output dynamics and other indicators, the general ,each zone requires at least 10% of the load, if not the main road but side roads, main road will add dummy load (500mA above).

6, It will affect its life to turn on or off switching power supply frequently. 

7, When measuring ripple, should use the  20M analog oscilloscope, parallel contact 04/100V ceramic capacitors and electrolytic capacitors 47UF/100