文档介绍：AATXTX PowerPower SupSup
Ton Giesberts
PC power supplies can often be bought cheaply at
places such puter fairs. But it isn’t that easy
to check if such a (second hand) power supply still
works properly. This
dedicated tester makes
that job quick and
straightforward.
46
pplypply TesterTester Checks all voltages
ATX connector
New ATX specification 20-pin 24-pin
pin 1 pin 11 pin 1 pin 13
This tester was designed for recent ATX power supplies, but it is
also ready for use with new power supplies described in version +3V3 +3V3 +3V3 +3V3
of the ATX specification. These have a main connector with 24 +3V3 -12V +3V3 -12V
pins instead of 20 (75 Watt extra for use by PCI Express cards). GND GND GND GND
+5V PS-ON# +5V PS-ON#
There is a curiosity in the new specification regarding the -5 V con- GND GND GND GND
nection. According to version of the specification it is no longer +5V GND +5V GND
used and the pin in question (20) is marked as NC (not connected). GND GND GND GND
However, according to the manuals of several motherboards with a PWR-OK -5V PWR-ON NC
new 24-pin connector the –5 V is still present. So keep in mind that +5VSB +5V +5VSB +5V
when you test a power supply with a 24-pin connector the –5 V +12V +5V +12V +5V
+12V +5V
output may or may not exist. The –5 V should always be present on pin 10 pin 20
a 20-way connector.