Checking a PSU with a multimeter is a crucial step in diagnosing and troubleshooting computer hardware issues. A multimeter is a versatile tool that can measure voltage, current, and resistance, making it an essential tool for any technician or hobbyist working with electronics.
When checking a PSU with a multimeter, the most important thing is to ensure that the power supply is disconnected from any power source. Once the PSU is disconnected, you can use the multimeter to check the voltage of the power supply rails. The most common power supply rails are the 12V, 5V, and 3.3V rails. To check the voltage of a power supply rail, connect the black lead of the multimeter to the ground terminal of the PSU and the red lead of the multimeter to the positive terminal of the power supply rail. The multimeter should read the voltage of the power supply rail.