[time-nuts] OT: Basics of voltage calibration?
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.
From: Jürg Kögel
Sent: Sunday, March 15, 2009 7:36 AM
A good reference is the old Fluke publication "Calibration - Philosophy
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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