VOGONS


First post, by GabrielKnight123

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Hi all, I have a 200W AT power supply and the fan needs replacing so I would like to do a test with a multi meter before I use it, its a switching power supply and I read that I should not test it without it having a load so how do I do this if needed and do I just compare the pinout of the 12 pin power connector with how they are?

ie:
http://pinouts.ru/Power/MotherboardPower_pinout.shtml

Reply 1 of 11, by root42

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Maybe attach a 12V halogen incandescant light bulb to it? That should qualify as a load... 😀

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Reply 2 of 11, by gdjacobs

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For a one shot test, you can take a pail of water with your leads inside and calibrate it by using any electrolyte (salt, H2SO4, etc). You're going to want about one ohm of impedance (no need to run at full blast).
https://en.wikipedia.org/wiki/Liquid_rheostat

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Reply 3 of 11, by Errius

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I remember reading somewhere about dedicated PSU testing machines. Does anyone know about these?

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Reply 5 of 11, by gdjacobs

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Thousands. Plus, how are you at reading traditional Chinese?
http://www.sunmoontec.com/cpzs.asp?MidCode=SM … %BA%D4%D8%BB%FA

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Reply 6 of 11, by 133MHz

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I use a combination of 4R7 7W ceramic resistors (each one draws roughly 1A @ 5V) and 50W 12V halogen lamps for load testing computer power supplies.

http://133FSB.wordpress.com

Reply 8 of 11, by GabrielKnight123

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Ok so if I connect three good working hard drives, the power supply has 3 molex and 2 floppy, and nothing to the main 12 pin plug would that be enough for a load test? Also the fan does not work so how long could I play around with it without a fan sucking hot air out or can I take the cover off and hope it doesnt get hot?

Reply 9 of 11, by gdjacobs

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Three working hard drives should only be good for <<100 watts. Also, if the fan is seized it should be pulled. You can temp in another fan, either external or internal, to guarantee airflow into the PSU.

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Reply 11 of 11, by gdjacobs

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I would be amazed if they use 100W. 15k RPM drives, for instance, use between 15 and 20W.
http://ixbtlabs.com/articles2/storage/hddpower-pro.html

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