[Test-Equipment] OLD lab instrumentation

[wolfbob]

Makes no sense to me. If a standard cell is good to 0.001% then 10 of them
are not good to 0.0001%. There are random errors than could be averaged and
there are fixed errors like in setting watches, that cannot be averaged. I
see nothing in the chemistry of standard cells that makes their error a
random event, but one of a fixed offset that may be part of every on none
and if one is broke or old or dry or whatever, then surely it will screw up
any attempt to average and obtain any meaningful conclusions.

WBob


----- Original Message ----- 
From: "Dale H. Cook" <radiotest at cox.net>
To: "wolfbob" <wolfbob at csnsys.com>; <test-equipment at mailman.qth.net>
Sent: Saturday, May 29, 2004 5:44 AM
Subject: Re: [Test-Equipment] OLD lab instrumentation


> At 08:25 PM 5/28/2004, wolfbob wrote:
>
> >A man that wears two watches never knows what time it is...
>
> Not really appropos - a long-used technique for setting a voltage
reference
> is to take the average of a battery of standard cells, as John Miles
points
> out downstream. <g>
>
> 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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