Why Use a PSU Tester?
PSU testers are so cheap and so easy to use that we really can’t recommend them enough.
But inside, they’re identical.
Jason Fitzpatrick / How-To Geek
Here’s how to test your PSU safely with a tester.
At no point will we be opening up the PSU itself.
Doing so without proper precautions, knowledge, and tools can give you a lethal shock.
This simple all-in-one unit tests ATX power 20 and 24-pin connectors as well as PCI-e, MOLEX, and SATA power connectors, too.
Before Testing your PSU, Disconnect the Cables
Power off your PSU.
If it has a switch, it’s possible for you to use the switch on the back.
Otherwise, unplug it.
Turn on the PSU.
Beneath those categories, it will show you the actual voltage.
It’s OK if these values don’t match up exactly.
It will also show you the PG value.
An acceptable value is 100-500 milliseconds.
Because of that, you gotta test the cables one at a time (e.g.
don’t plug in a SATA cable and a MOLEX drive connector simultaneously).
If your PSU tests indicate that the expected voltages are out of spec (e.g.
