Re: PSU question

Paul <nospam@xxxxxxxxxx> wrote:

John Doe wrote:

....

Even if using a multimeter were a good approach, it still
wouldn't explain the bad reading. I would want to know the cause.
Maybe the mainboard/chipset sucks.

You realize of course, that the ADC in the SuperI/O chip, that
makes the voltage readings, has external scaling resistors per
channel, installed on the signals being measured. If the scaling
resistors are wrong,

.... you need better hardware.

or the application used to read out the values, doesn't have the
correct scaling information,

.... you need a better utility.

then the readings from the utility can be wrong. Scaling resistors
are necessary for any rail being measured, where the rail voltage
is higher than the max reading range of the chip. This is why you
are less likely to get an incorrect reading for Vcore or perhaps
3.3V.

I have one utility that gets the right answer, and one utility
that gets only the 12V reading wrong, which implies that the
equation used in the incorrect utility needs to be corrected.

This is why, comparing utility readings to multimeter readings,
can set your mind at ease, when you see a problem.

In any case, when you tell a user you do not know to open the case
and probe around with the computer plugged in and powered on, IMO
you should at least provide some warnings. Some users have never
used a multimeter and they wouldn't know how.

While home building a computer, the only reason to have the case
open while it's powered on is to make sure all of the fans are
running, and that practice is probably becoming obsolete too.



--
My big wheel in-line street skates (a.k.a. rollerblades).
http://www.flickr.com/photos/27532210@N04/2565924423/

Google Groups is destroying the USENET archive, to hell with Google.

.

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