John's Calibration Cell Page !


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We reverse engineered a couple and this is what we found.


Hickok USM-118A/B Zener Calibration Cell
A special thanks goes to Michael Feldt for his help in this project.
We believe this schematic drawing to be accurate.
I will include instructions on how to find the "1C and 1D" readings for the calibration cell at a later time.

BTW : if you have the battery version of the Calibration Cell I would like to buy it, send me an email. Thanks ! .

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Last updated September, 2000.
Copyright © 1996-2000 John Finchum.