PSU PWR_OK and PS_ON voltages

[honproplayer333]

I'm trying to test if my psu is working correctly using a multimeter.

I removed my psu and try to measure it in isolation.

With just the electrical mains switch switched on, I measured 2.95v on PS_ON(green line) and 0v on the PWR_OK(grey line) both with respect to the black line.
**These measurements are taken WITHOUT shorting the green to black.

Does this indicate a fault ?
What are the voltages suppose to be if the psu is working correctly?

What voltage am I suppose to find on
The PWR_OK (pin 8, grey line) and PS_ON (pin 16, green line) of the 24 pin atx power connector?

 

[Satan-IR]

Sounds about right. Power good (OK) is a momentary control signal that announces from PSU to motherboard that the voltages and currents are stable and unit is ready to power up and it should read 0.

Power On is the signal from motherboard to PSU to power up and its internally set by the PSU at 5 volts if I'm not mistaken 3 volts in some units. So that 2.95 should be OK.