[volt-nuts] Sorry: Low-cost Josephson Junction Array Corrected link

Mitch Van Ochten Mitch at vincentelectronics.com
Wed Oct 19 21:26:28 EDT 2016


The Fluke DVMP Care Plan will give you the ability to know the value of your best voltage standard, and it's drift rate, at FAR less expense than buying your own JJA:


It will give you results with about HALF the uncertainty compared to sending your standard to NIST.

How the program works:

"When you purchase a Fluke DVMP, you will be grouped with two other customers in the “Round Robin.” A Fluke-owned 732, with all necessary connecting cables and clear operating instructions, will be sent to your site for comparison with your reference standard. You make and record a series of readings over a period of three days and forward the Fluke-owned 732 to the next company in the “Round Robin.” You send your data to Fluke for evaluation at the Fluke Primary Standards Laboratory. After the
Fluke-owned 732 is received at Fluke, it is once again compared to the J-Junction. A value is then assigned to your 10 volt standard, relative to the volt as maintained by the Fluke Primary Standards Laboratory using its J-Junction, and a report of calibration is sent to you."

They ship their 732B to you "hot" and it is guaranteed to arrive in calibration.

Anyway, to me it makes a lot more sense than building your own JJA.

Best regards,


-----Original Message-----
From: volt-nuts [mailto:volt-nuts-bounces at febo.com] On Behalf Of Tom Knox
Sent: Wednesday, October 19, 2016 8:43 PM
To: Discussion of precise voltage measurement
Subject: [volt-nuts] Sorry: Low-cost Josephson Junction Array Corrected link

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.


PREDICTABILITY OF SOLID STATE ZENER REFERENCES<http://assets.fluke.com/appnotes/calibration/deaver_msc01.pdf>
PREDICTABILITY OF SOLID STATE ZENER REFERENCES David Deaver Fluke Corporation PO Box 9090 Everett, AW 98206 425-446-6434 David.Deaver at Fluke.com Abstract - With the ...


Thomas Knox

From: volt-nuts <volt-nuts-bounces at febo.com> on behalf of Ken Peek <ken.peek at diligentminds.com>
Sent: Wednesday, October 19, 2016 4:35 PM
To: volt-nuts
Subject: Re: [volt-nuts] Low-cost Josephson Junction Array


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.

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