How to check the power supply?

Offline Live detection

Under normal circumstances, in standby state of ps-on and Pw-ok two power signals, one is high, the other is low level, plug 9 feet only output +5VSB voltage, as long as the meter to measure the voltage to the parameter value, you can determine the result of the problem.

Artificial Wake power supply detection

Use a thin wire (such as a paper clip, fine copper wire, wire or tweezers) to ps-on the 14 feet of the ATX plug (the only Green Line) and the 3rd on the other end. 5, 7, 13, 15, 16, 17 feet of any short foot (black line) connection, this is the ATX power supply in standby state of artificial wake-up start, At this time ps-on signal should be low level, PW-OK, +5VSB signal should be high level, the most important is switching power supply fan will rotate, if the rotation of the power supply should be no problem (in the absence of a multimeter this is the most direct way to determine whether the power supply is damaged).

If the power supply is basically normal, in the case of electricity, the multimeter will be transferred to the DC 20V gear, according to your motherboard specifications on the motherboard power outlet nominal voltage measurement. It is best to use a digital table, to observe the voltage size and fluctuations can determine the quality of the computer power.

General formal manufacturers have passed a number of security certification Body certification. China's safety certification body CCEE, mainly including creepage distance requirements, resistance to electrical strength requirements, leakage current requirements, temperature, electronic interference requirements. The creepage distance requirement refers to the shortest distance between the two conductive components measured along the insulating surface or between the conductive components and the equipment interface. Resistance to electrical strength requirements refers to the AC input lines between the AC input and the chassis between the 0 voltage added to the AC 1500 volts and 2200 volts DC, do not penetrate or pull arc for the quality of qualified. Leakage voltage requirements refers to the switching power supply leakage current in 260 volts AC input should not exceed 3.5mA. Temperature requirements refers to the chassis power supply internal temperature should not exceed 65 ℃. Electronic interference is divided into two kinds of conduction interference and radiation interference, conduction interference through the power line transmission, the frequency of 30 MHz below, the main interference audio audio section, such as the start of the power in the vicinity of the TV, audio and other household appliances may not be normal use, this is the impact of conduction interference, and radiation interference due to the shielding effect of the power cover, The impact on the computer host itself is not very large. In the actual operation of the chassis power purchase, you can start from the following points:

First, appearance inspection. Because the heatsink is powerful in the chassis power supply and affects the power and life of the entire chassis, it is important to double-check that the heatsink is large enough for the power supply. Another point is to check whether the power supply cable is thick enough, because the output current of the power supply is generally larger, a little bit of resistance will produce a great pressure loss, good quality power cable are relatively coarse, the quality of the cable line is relatively good.

Second, the heat sink materials for inspection. From the radiator, the quality of the famous brand power is generally used aluminum or copper heat sinks, and the heat sink big son thick. Although the inferior power supply is also used aluminum or copper material, but the heat sink small and thin, and sometimes even use iron sheet as a heat sink, generally these are fake and inferior products.

Third, do some simple experiments. The first method is to simply test the load pressure drop, those less pressure drop power supply good quality. But in the test process must not be in + 12 volts,-12 volts to do, so as not to burn the power supply. The second method is in the case of the power supply is not connected to the ground, with the hands of the power shell (no danger), there should be a hemp hand of the electric shock, this is because the power supply after the start of its shell about 110 volts AC voltage. The third way is to listen to the power supply fan and the power supply is small and uniform when the fan is running on the empty carriage (the fan sound increases after the load).

Iv. if possible, open the power pod, can find good quality of the power supply materials, such as the use of square gbb capacitance, input filter capacitance is generally greater than 470 micro-method, output filter Capacitor value is also relatively large, at the same time the internal inductance capacitor filter network circuit more, and has a sound overvoltage, limited-flow protection components, At the same time PCB printing clear, neat wiring. From the market feedback, brand-name power sales generally better. However, it is noteworthy that the famous brand power of imitation and counterfeit products more, of course, profiteers are also more, so we choose not only to polish their eyes, but also to maintain a vigilant heart.