Repeat this process for the +5V (red wire) and +3. 3V, +5V, +12V, -12V, and +5VSB (standby).
Diagnose Power Supply Unit: Interpreting Voltage Readings and Tolerances
Gathering Tools and Safety Equipment To perform this test correctly, you need a reliable digital multimeter capable of measuring DC voltage. Analyzing Voltage Readings and Tolerances Interpreting the Results After taking measurements, compare your readings to the standardized voltage specifications.
3V rails support the motherboard and other integrated circuits. Testing a computer power supply with a multimeter is a critical skill for any technician or advanced user troubleshooting unpredictable system behavior.
How to Test a Computer Power Supply with a Multimeter: Reading 5V, 3V, 12V, and Standby Voltages
Accurate probe placement ensures the multimeter reads the true voltage being delivered to the motherboard. If the readings remain stable during this phase, the power supply is likely healthy.
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