Hi Ken,in our NMI they use JJA that use stirling method and as far I remember
the machines only need 2,5kw electricity but I dont remember the company name
and detail surely it must be expensive.I agree about fluke 732 or better
wavetek/datron 4910. our NMI use 4910 as transfer from other NMI all over the
world,The drift of this standard is "predictable" so if You have this voltage
standard with history You can predict by your self the actual condition of your
voltage except when there is a major thing happen to your box.maybe some one
else who has more experience can tell You more
Pada Kamis, 20 Oktober 2016 7:44, Tom Knox <act...@hotmail.com> menulis:
Hi Ken;
I corrected the link. There is a lot more to a voltage standard then the Zener,
a very reasonably priced alternative to a JJA may be a Fluke 732A.
These boxes have been in use for years and their characteristics have been
extensively documented.
This link may also be of interest.
http://assets.fluke.com/appnotes/calibration/deaver_msc01.pdf
PREDICTABILITY OF SOLID STATE ZENER
REFERENCES<http://assets.fluke.com/appnotes/calibration/deaver_msc01.pdf>
assets.fluke.com
PREDICTABILITY OF SOLID STATE ZENER REFERENCES David Deaver Fluke Corporation
PO Box 9090 Everett, AW 98206 425-446-6434 david.dea...@fluke.com Abstract -
With the ...
Cheers;
Thomas Knox
________________________________
From: volt-nuts <volt-nuts-boun...@febo.com> on behalf of Ken Peek
<ken.p...@diligentminds.com>
Sent: Wednesday, October 19, 2016 4:35 PM
To: volt-nuts
Subject: Re: [volt-nuts] Low-cost Josephson Junction Array
@Vince:
Thank you for the link! Very informative! There is also a nice video
showing some of the lab techniques, and some cautions working with
cryogenic liquids.
I would also like to explore miniature cryocoolers-- as these might be able
to support a small lower power array (1V) if it doesn't dissipate too much
power...
There is already some progress in this area with a QHR made from graphene
(at the NPL in the UK). So, maybe the same cryocooler could be used also
for the low-cost JJA ?
Having a 10V (fixed output) JJA and a 12K9 QHR would be the basis to
calibrate all other electrical standards in a lab. It would be nice to
have these sitting in their cryocoolers cranking out volts and ohms
practically indefinitely (or as long as you want)-- and if one has even a
rubidium atomic clock, then no external signals or standards of any kind
would be needed. Well, that and a triple-point of water cell (which I
have) for temperature calibrations.
-Ken
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