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Voltage Drop

A

ATITek

Limp Gawd
Joined
Aug 6, 2004
Messages
138
I was testing my electrical outlet that my gaming rig is plugged into it.

Anyone know what an acceptable drop in voltage is when all devices on the circuit are turned on?

With all devices off then I am getting 120.9 volts. Once all outlets on the circuit are drawing current then I gets minor drops between 120.2 and 119.5. So it is never dropping a full volt.

Reason I ask is that my PC maker suggested that some components have failed due to low voltage. However, this looks fairly good considering there are four outlets on this circuit and run everything from a TV to my PC.
 
Voltage drops from the wall don't really matter since your PSU will take care of properly regulating the voltages that go to your components (unless the PSU is not regulating properly in which case you have other problems). You'd need to get into brownout territory to actually see problems with your PC caused by inadequate voltages coming from the wall, and even then it probably wouldn't damage anything, it would just cause the PC to crash or the PSU to shut off.

So to summarize, the chance that any of your components were damaged by low voltages coming from the wall is slim to none.
 
What your PC maker is referring to is a Brown Out where the voltage drops down to something like 100VAC. For a given power draw, if the voltage goes down then the current has to go up, ad this can cause overheating. (That why when the test PS's here they drop the AC voltage to 100v.

What you're seeing is minor voltage fluctuations that I wouldn't worry about.
 
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