If it is of any interest NIST has just compared two of their PJSV's and it is in the 10-12 range.
https://www.nist.gov/srm/sri/standard-reference-instruments/sri-6000-series-programmable-josephson-voltage-standard-pjvs [https://www.nist.gov/sites/default/files/styles/480_x_480_limit/public/images/srm/130307-first-nim-pjvs.jpg?itok=21EbYlCO]<https://www.nist.gov/srm/sri/standard-reference-instruments/sri-6000-series-programmable-josephson-voltage-standard-pjvs> SRI 6000 Series Programmable Josephson Voltage Standard ...<https://www.nist.gov/srm/sri/standard-reference-instruments/sri-6000-series-programmable-josephson-voltage-standard-pjvs> www.nist.gov The Programmable Josephson voltage standard (PJVS) is an instrument that generates stable, quantum-accurate, direct-current (DC) voltages that are programmable over ... They also achieved the 1 volt threshold last year on the AC Josephson. Also of possible Volt-Nut interest, I have been characterizing a number of 3458A over the past year and on interest; I always assumed that most of the drift was from the Zener, but actually the A/D's are also a major factor. You would think with all the design updates Keysight could find a better A/D then the 1988 design. Enjoy Thomas Knox 1-303-554-0307 act...@hotmail.com ________________________________ From: volt-nuts <volt-nuts-boun...@febo.com> on behalf of Frank Stellmach <frank.stellm...@freenet.de> Sent: Wednesday, May 31, 2017 1:57 PM To: volt-nuts@febo.com Subject: [volt-nuts] Anyone got a photo of a 3458A with "new volt" printed on it? >> I was chatting to someone from my radio club in the pub last night, and somehow we got onto the definition of a volt. >> I'd like to try to research this, and perhaps give a talk at our radio club on it. David, there was very good Swiss metrology school in 2007, Les Houches, where Blaise Jeanneret published a concise presentation about the Volt, its definition and history. Unfortunately, this is nowhere online anymore. I could send it to you, if you were interested. Frank _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts volt-nuts Info Page - American Febo Enterprises<https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts> www.febo.com volt-nuts is a low volume, high SNR list for the discussion of precise voltage measurement and related topics. To see the collection of prior postings to the list ... and follow the instructions there. _______________________________________________ volt-nuts mailing list -- volt-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/volt-nuts and follow the instructions there.
