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Most confusing unsolved problem ever - Page 3

post #21 of 23
Quote:
Originally Posted by saintruski View Post

So I threw a multimeter at it, it showed 122v I don't think that's to outside of 120v but then again I'm not a professional. I don't know if it's spiking when I'm not testing I'll give it more random testing to see what happens.

114v-126v is perfectly acceptable for a 120v outlet. It can fluctuate per minute depending on power usage in your area.

Sorry I have no advice on your issue. Just dont be concerned if you see it anywhere between those limits. Anything more or less may warrant a call to the power company though. cheers.gif
post #22 of 23
Thread Starter 
Quote:
Originally Posted by Darrath View Post

114v-126v is perfectly acceptable for a 120v outlet. It can fluctuate per minute depending on power usage in your area.

Sorry I have no advice on your issue. Just dont be concerned if you see it anywhere between those limits. Anything more or less may warrant a call to the power company though. cheers.gif

I've managed to captured sharp spikes up to 130-140v for just 2 seconds at most from elongated tests. I'm doing a lot more tests, what's interesting is putting a multimeter to my PSU shows everything is fine on an ok circuit, and no damage is done to it.
post #23 of 23
The best way to test an AC outlet is by loading it down heavily with something like a hair dryer, vacuum cleaner, or toaster, and compare the voltage when the load is turned off and when it's turned on and running full blast. Apparently a drop of 6% is considered acceptable, but if the wire connections and sockets are tight you may see only a 2% drop. A lot of times excessive voltage drop is due to AC outlets that have "back stabbed" connections, where the wire is just poked into a hole, as opposed to held in place with a screw.

Most motherboards need the +3.3V and +5.5V regulated to within about 5%, but for stuff run from onboard voltage regulators, like the CPU (+12V is regulated to about 1V), the input from the PSU can go quite a bit lower, and I read one person say his computer was able to run with the +12V from the PSU going down to 8V (probably no disk drives).
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