Metrology Meeting in Stuttgart/Germany

[HighVoltage]

Is anyone interested in low ohm resistance comparison?
I could bring my collection of Burster Kalibrierwiderstaende and the fitting cables for the Keithley 2450 SMU and 3458A

0.001 Ohm to 10 Ohm

[BU508A]

Today I got confirmation of another guest present on the event. Let yourself be surprised.

Kleinstein will show up and do a speech?     

[Kleinstein]

I will not be there. So no speech and presentation of DIY  high resolution multi-slope ADC.
I though about coming, but did not find the time.

[Andreas]

Hello,

from Flinstone I got the following mail:
(see also 2nd entry on branadics list)
https://www.eevblog.com/forum/metrology/volt-nut-meeting-2019-in-stuttgartgermany/msg2426568/#msg2426568

I will bring with me:

 

    PTFE cable spools                             2C+S and 4C+S   (white PTFE Teflon with 0.91mm silver plating C = conductor, S=braid/shield)
    Au plated spade connectors        suitable for 3458A/8508A/8558A/8588A/etc. … (Au plating on top of pure copper)
    LTZ1000ACH                                       sourced from ARROW – new and unused parts
    2DW232                                               Correct brand and date code
    Au plated banana plugs                 Staubli 4mm (6 colours)

 

T&M equipment:

    METRON/WAVETEK/FLUKE 7000 series “M69”    (10.000 041 ± 2.5*10E-6)V           last Cal performed by JRP using traceable equipment from NPL London UK 8 May 2019
    RS-2       10kΩ Standard reference resistor (with EXTECH/FLIR RHT sensor)              Its value is well known up to 7 digits and ±0.5ppm uncertainty.
    Keithley 7510 or DAQ6510 to monitor RS-2 temperature inside enclosure
    Laptop running software to monitor WAVETEK with a 3458A unit … - I hope we can get assistance from someone to share his 3458A unit during afternoon Cal sessions.

(I cannot take my 3458A 2ppm unit as it is too heavy and vulnerable, I have no insurance in case the unit is damaged during transportation to Stuttgart).

with best regards

Andreas

[hwj-d]

I got a similar pm from a member where i guess, that could be flintstone. 

[branadic]

I'm sorry for all the late decider, but the time slot for registration is over.
To all others joining the event, you can bring your equipment on friday til 5:00pm to the event location to install it in the lab.

-branadic-

[guenthert]

I will not be there. So no speech and presentation of DIY  high resolution multi-slope ADC.
[..]

Well, you could present it here, on-line 

[branadic]

I will not be there. So no speech and presentation of DIY  high resolution multi-slope ADC.
I though about coming, but did not find the time.

What a shame, hope you will find the time at the next event including a speech, I'm sure there are a lot of people interested in your project. Until then, a lot of time to finish the design

-branadic-

[babysitter]

Glad to hear about the intentions to have a "next time" (then without changing the SI definitions, I guess.)

[e61_phil]

Currently we think which Hotel is the most meaningful to book...

In which Hotel we will meet the most of the attendees? Could somebody who has already booked give us a hint?

Thx
Philipp

[branadic]

I suggest Campus Guest, which is 10min walk to the event, 5-10min from the next underground station and 3 stations into the center of Stuttgart.

-branadic-

[HighVoltage]

I am booked at Campus Guest by email and they said they had plenty of rooms available.

[branadic]

I will have my temperature chamber with me, so if someone wants to perform a temperature cycling, you will have the chance at the event. It takes about 2h from room temperature to 15°C, all the way up to 45°C and back to room temperature.

-branadic-

[Andreas]

Hello,

I think I have asked that before somewhere but the elementary question is:

if a device has been calibrated before 20.05.2019:
how much do we have to add / subtract to get the "real" value.

with best regards

Andreas

[MiDi]

Hello,

I think I have asked that before somewhere but the elementary question is:

if a device has been calibrated before 20.05.2019:
how much do we have to add / subtract to get the "real" value.

According to mzzj it is 0.107 ppm. For 10V this is 1.07uV.

Edit: Clarification

[Andreas]

Thanks,

from the linked pdf of fluke:

The new value for the Josephson
constant (2e/h) is slightly smaller than the
1990 value, so a device that is measured to the
2019 value will be larger than the 1990 value
by approximately 0.1 ppm.

So as a volt-nut we have to add 1uV on the before 20.05. calibration readings of a 10V reference.

with best regards

Andreas

[guenthert]

You're not serious, are you?  Comparing two potentials at 10V above ground to less than 1uV is challenging, but within reach of the (very) dedicated hobbyist.  Measuring those potentials with an accuracy of less than .1ppm so that historical values can be compared is out of the question.

[maginnovision]

You're not serious, are you?  Comparing two potentials at 10V above ground to less than 1uV is challenging, but within reach of the (very) dedicated hobbyist.  Measuring those potentials with an accuracy of less than .1ppm so that historical values can be compared is out of the question.

He just said add 1uV to the calibration value. That seems to be perfectly fair. 

[branadic]

Metrology Meeting 2019 already started today. A few members already received, their items are installed in the temperature controlled lab, first discussion started and we will have dinner in 20min. 

#Volt-Nut

-branadic-

[TiN]

Somebody should do a livestream 

[The Soulman]

Someone should post some pictures and data. 

[Andreas]

Hello,

what do you expect?
-lots of people staring at 8.5 digit displays looking wether the last digit will flip (or not)?

BTW: look at the calibration date of the lower 3458A: it is within 24 hrs specs!!!

with best regards

Andreas

[The Soulman]

Hello,

what do you expect?
-lots of people staring at 8.5 digit displays looking wether the last digit will flip (or not)?

Yes! exactly that. 

BTW: look at the calibration date of the lower 3458A: it is within 24 hrs specs!!!

with best regards

Andreas

Is the source that good?

[Andreas]

Its the Fluke 7000 from above.
So 10.000 041 +/- 2.5 uV

Have not looked up the calibration report of the 3458A up to now if the value fits to the calibration offset.

with best regards

Andreas

[Andreas]

From calibration protocol (of yesterday):

for +10V the 3458A reading was 3.4 uV too high against calibrator actual value.
for -10V the 3458A reading was 4.1 uV (amount too high)
Calibration uncertainity is 2.5 ppm (+/-25uV) with 24 hrs we get 2.6 ppm (+/-26uV)

so for 10V + 56.8uV we have to correct to 10V + 53.4 uV
for -10V -58.5uV we have to correct to -10V - 54.4uV

the difference to 10V + 41uV from Fluke 7000 is 12.4 or 13.4 uV which is within the +/- 26 uV +/- 2.5 uV uncertainity.
But which device is showing the truth? -> we need more references/DMMs   

Edit: what where the results between the Fluke 7000 and the other Flukes (732)?

Edit: And even more evil: I did not find in the calibration protocol if the calibrator has been already set for the new volt 

with best regards

Andreas