You will need
  • - power supply unit;
  • - voltmeter/multimeter.
Do a quick check of the unit power supply without being connected to devices and equipment. Take it 20-pin connector, locate the green wire and jumper wire to any black. If the block began to spin the fan, generally means the power supply is operational. For more detailed check, use the following steps.
Look on the unit label, which provides information on allowable values, load currents on the channels, usually it is located on the side wall. Next, check the voltage on each of the channels with a multimeter to determine the efficiency of the unit, but rather, some of its elements. Information on "ideal" indicators and possible tolerances can be found on the official website of the manufacturer.
Plug the power supply in series with an ordinary incandescent lamp, to avoid "fireworks". Turn on the unit in the network measure relative to the common wire voltage at the ninth terminal of the connector of the motherboard. If all the readings correspond to the permitted values, connect the PSU directly. Turn on the unit. This lock 14 and 15, the socket of the motherboard.
"Load" the block to measure and evaluate the performance of BP. You must submit a load on it, at least half the maximum current. In the case of the 250W unit, it will be 11 amps. The load use powerful wire resistors, for example, sew.
But be careful, this load can become fatal for most of cheap blocks. Therefore, move the load to the lower limit value of the current. Consider also that the resistor power is dissipated. For the +12V power is approximately 20-25W. Choose load resistors of these considerations.
Connect the load and measure the indications to perform a health check BP, if the values of the stress correspond to parameters of the plate, the unit is suitable for use.