[volt-nuts] Old Weston cells

[J. L. Trantham]

Joe,

Do you have any data about prior measurements of these cells or their
history?

I read somewhere there is a predicted decline rate based on time and
temperature IIRC.

Once you get the meter calibrated, you can 'track' their measurements.

Might also be time for a 'differential voltmeter' to add to the 'stable'.

Joe

-----Original Message-----
From: volt-nuts-bounces at febo.com [mailto:volt-nuts-bounces at febo.com] On
Behalf Of Joseph Gray
Sent: Monday, August 26, 2013 9:59 PM
To: Discussion of precise voltage measurement
Subject: [volt-nuts] Old Weston cells

I got my hands on a few very old, unsaturated cells. I figured that they
would be no good after all this time. Just out of curiosity, I measured them
on my 3457A, which hasn't been sent off for calibration yet.

DMM was set to 3 V scale to keep the input impedance high. Room temperature
= 26 C.

Cell #1 = 1.018288
Cell #2 = 1.018236
Cell #3 = 1.018224

I read that when they get below 1.0183 V, they are no good. Is there any
(easy) way to rejuvenate these cells?

Joe Gray
W5JG
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