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Power Supply Voltages

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  #1 (permalink)  
Old 05-20-2007
John
 

Posts: n/a
Power Supply Voltages
Any opinions on these voltages on my new power supply?

The are from the BIOS. I have had a couple of other PSUs which have had
fairly close readings from this BIOS.

Here's what it reads:

VCore 1.79
3.3v 3.25
5v 4.78
12v 12.48

Are these close enough to run on, or am I looking for trouble. Should I
send it back?
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  #2 (permalink)  
Old 05-20-2007
Michael A. Covington
 

Posts: n/a
Re: Power Supply Voltages
> 5v 4.78
> 12v 12.48
>
> Are these close enough to run on, or am I looking for trouble. Should I
> send it back?


The latter two look almost out of specification, but before drawing a
conclusion, read them with a real voltmeter (red-to-black and
yellow-to-black respectively on a disk drive connector while the machine is
running).

As I recall, the tolerance is 5%, meaning 4.75 is the minimum for the 5-volt
supply and 12.60 is the max. for the 12-volt supply.


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  #3 (permalink)  
Old 05-20-2007
John
 

Posts: n/a
Re: Power Supply Voltages
Michael A. Covington wrote:
>> 5v 4.78
>> 12v 12.48
>>
>> Are these close enough to run on, or am I looking for trouble. Should I
>> send it back?

>
> The latter two look almost out of specification, but before drawing a
> conclusion, read them with a real voltmeter (red-to-black and
> yellow-to-black respectively on a disk drive connector while the machine is
> running).
>
> As I recall, the tolerance is 5%, meaning 4.75 is the minimum for the 5-volt
> supply and 12.60 is the max. for the 12-volt supply.
>
>


In the 70s we had some disk drives that required lower voltages to have
much tighter tolerances, so I was more concerned with that 3.25 for the
3.3v.

I'll get my voltmeter on the 5 & 12, as you suggested
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