[OT] Cannot save BIOS settings

[Tod Merley]

Forgot to change subject - my regrets.

> Date: Thu, 23 Feb 2006 23:20:06 -0800
> From: "Tod Merley" <todbot88 at gmail.com>
> Subject: Re: fedora-list Digest, Vol 24, Issue 231
> To: fedora-list at redhat.com
> Message-ID:
>        <8b5e63cf0602232320k2b17f54ejfd6f59f069fc59ca at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
>
> > Date: Thu, 23 Feb 2006 20:15:36 -0500
> > From: jludwig <wralphie at comcast.net>
> > Subject: Re: [OT] Cannot save BIOS settings
> > To: For users of Fedora Core releases <fedora-list at redhat.com>
> > Message-ID: <200602232015.37404.wralphie at comcast.net>
> > Content-Type: text/plain;  charset="utf-8"
> >
> > On Thursday 23 February 2006 19:17, Tod Merley wrote:
> > > > Date: Thu, 23 Feb 2006 16:51:28 -0500
> > > > From: "James He" <icrazy at gmail.com>
> > > > Subject: [OT] Cannot save BIOS settings
> > > > To: fedora-list at redhat.com
> > > > Message-ID:
> > > >        <fd0f51b90602231351h361b635cx4da7fce0941a8534 at mail.gmail.com>
> > > > Content-Type: text/plain; charset=ISO-8859-1
> > > >
> > >
> > > 2. Measuring the actual CMOS battery voltages - with a volt meter out
> of
> > > box and with a simulated load if I could figure out with that was (if
> it
> > > holds with a 1K resistor my guess is that it is fine).  I would also
> > look
> > > into measuring it as it feeds the CMOS on the MB (very carefully of
> > > course!!).
> > >
> > !
> > >
> > > Tod
> > These batteries deliver micro-amps. Maybe a 100k resistor.
> > (They usually last 3 to 5 years in service.)
>
>
> Your point is well taken.  I stand well corrected.
>
> The technical specifications of a typical 2016 battery can be found at:
>
> http://www.kodak.com/eknec/documents/f9/0900688a8019d7f9/KCR2016.pdf
>
> A couple of interesting things here.  One is that your 100K resistor will
> load the poor little critter down to about 2.8 volts at room temperature
> (see the operating voltage verses load resistance curves) and a second is
> that typical "skin resistance" I have measured often in the 100K range (it
> varies from about 2M on very dry tough skin down to a couple of K if
> people
> are sweating) and that cheap meters I have seen have "ohms per volt"
> rateings of as low as 1K.  So on the three volt scale the meter would load
> 3k making the measurement.
>
> Thanks for the help!
>
> Tod


And I will try to remember to change the subject as well!

Tod
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.fedoraproject.org/pipermail/users/attachments/20060224/ede93c95/attachment-0002.html