[volt-nuts] Back to voltage was Re: Precision current source

Greg Burnett gbusg at comcast.net
Mon Aug 23 20:40:18 UTC 2010

Good points Marv. In the past I've participated in MAPs (and trending) that 
were structured just like you describe (with external calibrations done only 
at the start and end of the data collection period, to establish the end 
points - and with environmental controls sufficient for purpose).


----- Original Message ----- 
From: "Marv Gozum @ JHN" <marvin.gozum at jefferson.edu>
To: "Discussion of precise voltage measurement" <volt-nuts at febo.com>; 
"Discussion of precise voltage measurement" <volt-nuts at febo.com>
Sent: Monday, August 23, 2010 1:55 PM
Subject: Re: [volt-nuts] Back to voltage was Re: Precision current source

It would be nice, but it likely unnecessary. The calibrations need to
be done only at the start of the data collection and then at the end,
to establish the end points.  The collected data plots how it varies
day to day, and the general trend.

Sorry, last message sent prematurely.

Also, in setting the environment, its not necessary to complicate
calculations and let it swing to extremes.  So keeping the reference
in a temperature controlled room set by an ordinary air conditioner
is enough to reduce swings in relative humidity and temperature, but
not control it.  This leaves barometric pressure as the largest variable.

At 06:40 AM 8/23/2010, Greg Burnett wrote:
>I forgot to mention: It would be good to plot your "statistical dcv system"
>vs. a known external reference (e.g., JJ-array if your goal merits that
>level of reference).

Best Wishes,

Marv Gozum

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