[time-nuts] OT: Basics of voltage calibration?

Bill Hawkins bill at iaxs.net
Sun Mar 15 16:24:22 UTC 2009

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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