[volt-nuts] Anyone got a photo of a 3458A with "new volt" printed on it?
frank.stellmach at freenet.de
Wed May 31 13:54:00 EDT 2017
no, pity, I don't have a photo of such a sticker.
But I remember, that I got my first 3458A at Aachen university in
The latest change on the volt happened exactly 1st January 1990, that
was also the last change towards the still valid SI-1990.
So I had a brand new 3458A, with the old Volt, which became invalid
about 2 months later.
As the instrument came directly from the U.S., with the U.S. Volt
inside, the change was quite big, about 7ppm, or so.
I assume, that these stickers date from beginning of 1990, then.
The next redefinition of the Volt will very probably happen end of next
year, for SI-2018.
There will be no stickers, as the change this time will be a few tenths
of a ppm.
Afterwards, the Volt definition then will be 'exact', with zero
uncertainty, instead of about 0.2ppm at the moment.
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