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How to measure +3.3v and +5.0v??


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I want to ask how i can measure the voltage on the +3.3v and +5.0v lines,

with the computer powered up??


I checked my voltages with software and it reports the +3.3v, as low as 3.04 under load, and the +5.0v at 4.75...


I know the software can give you false readings, so i want to check it with a multimeter, to check if the PSU is good or bad..



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motherboard receptacle.

Pin Name Color Description

1 3.3V Orange +3.3 VDC

2 3.3V Orange +3.3 VDC

3 COM Black Ground

4 5V Red +5 VDC

5 COM Black Ground

6 5V Red +5 VDC

7 COM Black Ground

8 PWR_OK Gray Power Ok is a status signal generated by the power supply to notify the computer that the DC operating voltages are within the ranges required for proper computer operation (+5 VDC when power is Ok)

9 5VSB Purple +5 VDC Standby Voltage (max 10mA)

10 12V Yellow +12 VDC

11 12V Yellow +12 VDC

12 3.3V Orange +3.3 VDC

13 3.3V Orange +3.3 VDC

14 -12V Blue -12 VDC

15 COM Black Ground

16 /PS_ON Green Power Supply On (active low). Short this pin to GND to switch power supply ON, disconnect from GND to switch OFF.

17 COM Black Ground

18 COM Black Ground

19 COM Black Ground

20 -5V White -5 VDC (this is optional on newer ATX-2 supplies, it is for use with older AT class expansion cards and can be omitted on newer units)

21 +5V Red +5 VDC

22 +5V Red +5 VDC

23 +5V Red +5 VDC

24 COM Black Ground

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