Every PSU has a rated voltage and a maximum current capacity, both of which are usually printed on the label. In these cases, replacement is often the most cost-effective solution.
Measuring Power Supply Voltage Under Load
Setting Up the Multimeter To begin, turn the dial of your multimeter to the DC voltage setting if you are testing a standard DC adapter. A power supply is the foundation of any circuit, providing the stable voltage and current required for reliable operation.
This reveals whether the PSU can deliver its maximum rated amperance. For alternating current (AC) supplies, such as those from a wall outlet, select the AC voltage mode.
Measuring Power Supply Voltage Under Load
If the voltage is fluctuating wildly, the regulation is poor, meaning the PSU cannot maintain a steady output. Slightly low voltage under load points to internal resistance or a failing capacitor.
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