Metrology Meeting 2024 in Stuttgart/Germany - The finale

[Sprock]

Pic MM2024 all Ziped.

Sprock

[Dr. Frank]

Hello Sprock,
Zip_3 attachment is missing!
Maybe too big?

Anyhow, many thanks for the pictures
Frank

[Sprock]

Thanks for Info

[branadic]

Thanks for sharing the photos. To also share some numbers, I've taken some measurements on Sunday after MM2024:

F7000-1 drifted from 9.9999807 V (measured on 26. Nov. 2020 at xDevs.com) to 9.9999271 V (18. Aug. 2024) --> delta: -53.6 µV in 1361 days
F7000-2 drifted from 9.9999918 V (measured on 26. Nov. 2020 at xDevs.com) to 9.9999739 V (18. Aug. 2024) --> delta: -17.86 µV in 1361 days

That's -14.37 µV/year for F7000-1 and -4.79 µV/year for F7000-2, which agrees with the diagrams I presented at MM2024 showing a larger drift for F7000-1. The huge drift for F7000-1 might explain why it was sold back in 2020. I remember Frank reporting excess drift on his F7000-3 too, but I currently don't know the drift of W7000, that came with F7004T.

-branadic-

[Okertime]

Here are some measured differential voltages to my Fluke 732B over time:


                  MM2021            MM2022            MM2024

F732B              0                     0                      0

F7000-1       -30.4 uV          -43.0 uV           -63.4 uV

F7000-2         -7.0 uV          -13.4 uV           -17.2 uV

W7000         -11.1 uV          -12.6 uV           -25.6 uV

F732A ron                          -?11.9 uV          +27.0 uV

[Sprock]

Here we go.

W7000 from Nov 2020  -->  9,999991 V

W7000  at MM 2024      --> 9,9999619 V

as temperature was around 28°C this is for me a bit questionable.

should doing this again under better condition.

anyway lot´s of fun

[Roehrenonkel]

Hi,

the photos i took are basicaly the same as from Sprock.
If anyone is interested in the whole set i can send a "wetransfer.com"-link to your e-mail.

Best regards

[iMo]

Is there any info how the Z10 is made?
An ovenized Jfet Vref(s) with a Chuck's "opamp noise thread" winner as the buffer? 

[BU508A]

Is there any info how the Z10 is made?
An ovenized Jfet Vref(s) with a Chuck's "opamp noise thread" winner as the buffer? 

No technical details have been revealed. It is still a magic box with lots of coloured charts.

[MiDi]

Big thanks for the wonderful meeting, sad that this was the last meeting in this form 

A bit late to the party, but here are my results:
LTZ#3 as brought:                                  7.1006285V ±0.30ppm
as measured by Dr. Frank:                      7.1006253V ±0.42ppm (-0.40ppm)
as measured by 732B from Okertime:     7.1006324V ±0.5ppm  (+0.55ppm)
as measured by F7000-1 from branadic: 7.1006282V ±2ppm     (-0.05ppm)
as measured by F7000-2 from branadic: 7.1006286V ±2ppm     (+0.01ppm)
as measured by 3458A from branadic:    7.1006344V ±2ppm     (+0.82ppm)

[Andreas]

Hello,

some impressions of the small MM2025 in Neckarsulm:

Happy to import the volt and seeing that the drift since 2024 is well below 1 ppm on my most stable references.

with best regards

Andreas

[Andreas]

part 2

[Andreas]

part 3

[branadic]

It was a wonderful day with good discussions, good catering and first time with a quantum device around. 
My references also turned out to have a 1 year drift well below 1 ppm with respect to Frank's 3458A. They have drifted:

LTZ1000#1: 0.57 ppm
LTZ1000#2: -0.6 ppm
LTZ1000#3: -0.67 ppm

in 596 days. 

-branadic-

[Andreas]

Hello,

my results after lookup of old calibration from 17.08.2024

LTZ#4: -0.16 ppm/year
LTZ#9: -0.09 ppm/year
ADR#2: -0.01 ppm/year

with best regards

Andreas

[Dr. Frank]

It was a wonderful meeting today, and thanks to Philipp as well, that he made 10kΩ  and 10V available with 0.3ppm uncertainty
Thanks to Andreas for his hospitality, and to his wife for Spaghetti Bolognaise
Frank