[volt-nuts] Old v. New Volt?

Brooke Clarke brooke at pacific.net
Thu Dec 8 13:41:05 EST 2016

Hi Frank:

Thanks very much.

I'm 99.999% sure the 332 is the instrument used.  Not in the sense that it was accurate, but in the sense it could 
supply a voltage that stayed the same for a few minutes while it was read with the "old volt" 3458 then the "new volt" 3458.

Have Fun,

Brooke Clarke
The lesser of evils is still evil.

-------- Original Message --------
> Brooke,
> I had the very same encounter in 1989/1990.
> I received the new 3458A in November 1989, and only 1 month later, on 1st January 1990, the New Volt (SI-1990) went effective.
> As my instrument came directly from the U.S., the difference in calibration was 9.264ppm, which the instrument now was reading high.
> You may read my whole volt-nuts story related to this SI - change here:
> http://www.eevblog.com/forum/metrology/1000-my-(hi)story-of-the-weston-cell-of-the-volt-and-of-being-a-volt-nuts/.
> The 332B might not have been your reference standard, as its uncertainty is 10ppm / 60days only.
> Maybe you had a 732A, or a bank of Weston cells in your lab, otherwise this change could not securely be observed by a solitary Fluke 33xB/D.
> best regards
> Frank
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