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.
http://www.prc68.com/I/Fluke332B.html
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
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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