[time-nuts] OT: Basics of voltage calibration?
Jean-Louis.Oneto at obs-azur.fr
Wed Mar 18 03:48:35 UTC 2009
I suppose it was to to keep the electrolyt to slam around ;-}
----- Original Message -----
From: "Bill Hawkins" <bill at iaxs.net>
To: "'Discussion of precise time and frequency measurement'"
<time-nuts at febo.com>
Sent: Sunday, March 15, 2009 4:24 PM
Subject: Re: [time-nuts] OT: Basics of voltage calibration?
> Yes, never load a standard cell.
> It's standard practice to put a jumper across the terminals of a
> galvanometer for shipping, so the needle (or mirror) doesn't slam
> Some years ago, I got a standard cell from eBay. The terminals had been
> shorted for shipping.
> Bill Hawkins
> -----Original Message-----
> From: Jürg Kögel
> Sent: Sunday, March 15, 2009 7:36 AM
> A good reference is the old Fluke publication "Calibration - Philosophy
> in Practice"
> by Steve Spang. (1975)
> Be very carefull with standard cells! Never load a cell. Use the cells
> only with high ohm null detectors.
> A loaded cell need a long time for regeneration (or come back never to
> the old value!)
> I think a good zener reference is a better practical solution for today.
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