#select battery

1. Appearance inspection

(1) Good power supply is generally made of larger and thicker aluminum or copper hot plates, so the weight is heavier for inferior power supply.

(2) Good power output line is thick.Do not look down upon these several output lines, because the power box output current is generally larger, a little resistance value will appear a larger voltage loss, so good quality power must be thick line. 

As for the ATX power supply, all output terminals can be suspended. First, measure the no-load output voltage. The method is to short-connect PS-ON and GND to the starting power supply, and then measure the voltage when the output current is 10A.But the above test cannot be done on ±12V, otherwise the power supply will be burnt out.If power supply does not have ground line, the good power supply that passes safety regulation to attestation is on its housing after electrify start about 110V ac voltage, and hands feel numbness slightly. If the voltage can not be measured it means that the internal cut corners did not install the filter circuit.In addition, the fan sound is even and smaller when running without load, and the wind will be slightly more normal when connected with the load.  

3, open the power box, you can find good quality power supplies with the good matrials

For example, the square CBB capacitor is mostly used, the input filter capacitance value is larger than 470 micro method, and the output filter capacitance value is also larger. Meanwhile, many internal inductance and capacitor filter circuits, there are complete over-voltage and current-limiting protection components and circuit boards with clear printing and neat wiring.