[Test-Equipment] OLD lab instrumentation

[wolfbob]

Yes, but your assumption that the error is not a bias is not necessarily
justified by the chemistry. Just what phenomenom in a standard cell is
random and without bias? I can't think of any, but I am no chemist and
really don't know.

It is a common mistake in engineering to assume that errors in things are
random and therefore accuracy can be increased by averaging. This is rarely
the case unless something like noise is present.

WBob

----- Original Message ----- 
From: "Dale H. Cook" <radiotest at cox.net>
To: "wolfbob" <wolfbob at csnsys.com>; <test-equipment at mailman.qth.net>
Sent: Sunday, May 30, 2004 2:47 AM
Subject: Re: [Test-Equipment] OLD lab instrumentation


> At 11:32 PM 5/29/2004, wolfbob wrote:
>
> >If a standard cell is good to 0.001% then 10 of them
> >are not good to 0.0001%.
>
> If all of the cells of a bank are representative, and are not subject to a
> systematic bias such as a manufacturing defect or operation at other than
> the specified temperature, then the average of their values approaches the
> theoretical value for that type of cell as the number of averaged cells
> increases.
>
> Dale H. Cook, Chief Engineer, WWWR Roanoke VA, WCQV Moneta VA, WKBA WZZI
> Vinton VA, WKPA WLNI WZZU Lynchburg VA, WMNA/WMNA-FM Gretna VA
> http://members.cox.net/dalehcook/starcity.shtml
>
>
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