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PWR_OK corsair ax-1200 help !!

post #1 of 15
Thread Starter 
Hello all biggrin.gif

Today I have recived a new rma psu, I have used my regular PSU tester it is a coolmax (I have tested many psu it work pretty well) i have found that PWR_ok is more than 500 ms 5 times of 10 cold power on. and I have found this is the normal timing for any atx-psu is 100 ms to 500 ms so I don't know if I have to return the psu or give it a chance. or this issue can harm my hardware or start any stability issue.


5/10 the good power delay is more than 500 ms wrong timing.
1/10 the good power delay is 420ms. good timing
3/10 the good power delay is 500 ms. good timing
1/10 the good power delay is 480 ms. good timing


PWR_OK Signal Timing
Parameter Description Value
T1 Power-on time < 500 ms
T2 Rise time 0.2 - 20 ms
T3 PWR_OK delay 100 - 500 ms
T4 PWR_OK rise time < 10 ms
T5
AC loss to PWR_OK hold-up
time
> 16 ms


Please need some advice before put it on my tower pc.
Edited by Noob_with_Tools - 8/15/12 at 1:37pm
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post #2 of 15
Why would you return the product if you say you found that it was exhibiting "normal" timings for psus of its class ...

Plug it to the PC and see if it works. If pwr_ok is bad, then it won't power on and you'll have your answer.
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post #3 of 15
Thread Starter 
sorry my bad, my psu show like HH so this mean the measure is any where over 500 MS 5 times of 10 try so @ this psu won't work well with a intel ATX mobo.
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post #4 of 15
I've taken one of those Coolmax testers apart (actually it was under the name of its actual manufacturer, Young Year). It's garbage. The PWR_GD signal checker uses a +/-20% ceramic capacitor, which is way too innaccurate for the job it's supposed to do. If you happen to be on the outer edge of that 20% then your PWR_GD reading could be off 20-40%. I've seen one that reported every single power supply checked as failing PWR_GD. Also it's an electrocution hazard since there are exposed pins on the FDD connector which share a circuit with the PCIe and Molex and SATA connectors, and since there are no current limiting resistors it's possible to electrocute yourself or set something on fire if the FDD pins get shorted. Also it uses a really, really crappy DMM IC for voltage measurements and display, and uses 5% resistors for its voltage dividers.


In short that "PSU Tester" is a massive piece of crap and you should just throw it in the trash.

There are $5 digital multimeters that use more accurate components and circuits. They use the same crappy ICs, but at least they use 1% resistors for voltage dividers and other higher quality analog parts.
Edited by Phaedrus2129 - 8/15/12 at 1:48pm
post #5 of 15
Quote:
Originally Posted by Noob_with_Tools View Post

sorry my bad, my psu show like HH so this mean the measure is any where over 500 MS 5 times of 10 try so @ this psu won't work well with a intel ATX mobo.

Well, I personally own that PSU model and it does/will work fine with ATX motherboards. I side with Phaedrus, your tester is a piece of crap.

Quote:
Originally Posted by Phaedrus2129 View Post

In short it's a massive piece of crap and you should just throw it in the trash.

*The psu tester, not the PSU tongue.gif
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post #6 of 15
Quote:
Originally Posted by compmaster View Post

*The psu tester, not the PSU tongue.gif

Yes, should have specified. tongue.gif
post #7 of 15
Thread Starter 
thx biggrin.gif so how I can test the PWR_OK is working well ?? on atx power connector 20 pin the pin 8 is the PWR_OK a digital multimeter can be used to test the PG ??? I Have never used a mulimeter for this test.
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post #8 of 15
Quote:
Originally Posted by Noob_with_Tools View Post

thx biggrin.gif so how I can test the PWR_OK is working well ?? on atx power connector 20 pin the pin 8 is the PWR_OK a digital multimeter can be used to test the PG ??? I Have never used a mulimeter for this test.

You can connect it to the system to see if the PC randomly powers off?

There is no way you can measure this with a digital multimeter, you would need an oscilloscope.
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post #9 of 15
It's just not an issue. Plug in the PSU. 99.999% chance it will work. If it doesn't work, then it doesn't work. End of file.
post #10 of 15
Thread Starter 
Quote:
Originally Posted by compmaster View Post

You can connect it to the system to see if the PC randomly powers off?
There is no way you can measure this with a digital multimeter, you would need an oscilloscope.

Nice meybe I can find a oscilloscope @ university, but for sure I don't want harm my hardware.
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