Comparison
Comparison close
Results

BIPM.EM-K10.b, SIM.EM.BIPM-K10.b, SIM.EM.BIPM-K10.b.1, and COOMET.EM.BIPM-K10.b

MEASURAND : DC voltage, Josephson standards
NOMINAL VALUE : 10 V

Degrees of equivalence: Di and expanded uncertainty Ui (k = 2), both expressed in nV

 

Red diamonds: participants in BIPM.EM-K10.b
Green triangle: participant in SIM.EM.BIPM-K10.b
Blue circle: participant in SIM.EM.BIPM-K10.b.1
Purple square: participant in COOMET.EM.BIPM-K10.b

LNE and PTB: only the most recent comparison is retained, and the degree of equivalence is computed using the final result following technical improvements in the comparison setup. ULNE = 0.2 nV
NIST 2009, SMD, EIM, NMC A*STAR, VNIIM, CMI, CENAM, MSL, NIM, DMDM and NIMT 
: the degree of equivalence is computed using the final result following technical improvements in the comparison setup

Comparison
Comparison close
Results

BIPM.EM-K10.b, SIM.EM.BIPM-K10.b, SIM.EM.BIPM-K10.b.1, and COOMET.EM.BIPM-K10.b

MEASURAND : DC voltage, Josephson standards
NOMINAL VALUE : 10 V

Degrees of equivalence: Di and expanded uncertainty Ui (k = 2), both expressed in nV

Note: only the most recent comparison retained for LNE and PTB
* indicates the degrees of equivalence computed using the final result following technical improvements in the comparison setup

NIST (2007): NIST participant in SIM.EM.BIPM-K10.b
NIST (2009): NIST participant in BIPM.EM-K10.b
INMETRO (2009): INMETRO participant in SIM.EM.BIPM-K10.b.1
BelGIM (2014): BelGIM participant in COOMET.EM-K10.b

Results are presented under A4 printable format in Summary Results (PDF file).

Comparison
Comparison close
BIPM comparison
Linked comparison
BIPM.EM-K10.b
Metrology area, Sub-field Electricity and Magnetism, DC Voltage and Current
Description DC voltage, Josephson standards
Time of measurements 1994 -
Status Continuous, approved for equivalence
Final Reports of the comparisons
References

BIPM.EM-K10 Technical Protocol Option B

BIPM.EM-K10 Technical Protocol Option A

Measurand DC voltage: 10 V
Transfer device Josephson standard
Comparison type Key Comparison
Consultative Committee CCEM (Consultative Committee for Electricity and Magnetism)
Conducted by BIPM (Bureau International des Poids et Mesures)
Comments

Last KCDB update: 23 May 2016

BIPM key comparison on DC voltage, Josephson standards, 10 V

SIM.EM.BIPM-K10.b, SIM.EM.BIPM-K10.b.1, and COOMET.EM.BIPM-K10.b results are linked to those of BIPM.EM-K10.b.

Pilot institute BIPM
Bureau International des Poids et Mesures
BIPM - International Organization
Contact person S. Solve
ssolve@bipm.org
+33 (0) 1 45 07 70 26
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
BIPM

Bureau International des Poids et Mesures, BIPM - International Organization, N/A

BEV

Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET

CEM

Centro Español de Metrologia, Spain, EURAMET

CENAM

Centro Nacional de Metrologia, Mexico, SIM

CMI

Czech Metrology Institute, Czechia, EURAMET

DMDM

Directorate of Measures and Precious Metals, Serbia, EURAMET

EIM

Hellenic Institute of Metrology, Greece, EURAMET

INETI

Instituto Nacional de Engenharia e Tecnologia Industrial (merged into IPQ), Portugal, EURAMET

INM

National Institute of Metrology, Romania, EURAMET

INMETRO

Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

LNE

Laboratoire national de métrologie et d'essais, France, EURAMET

METAS

Federal Institute of Metrology, Switzerland, EURAMET

MSL

Measurement Standards Laboratory, New Zealand, APMP

NIM

National Institute of Metrology, China, APMP

NIMT

National Institute of Metrology (Thailand), Thailand, APMP

NIST

National Institute of Standards and Technology, United States, SIM

NMC, A*STAR

National Metrology Centre, Agency for Science, Technology and Research, Singapore, APMP

NMIA

National Measurement Institute, Australia, Australia, APMP

NMIJ AIST

National Metrology Institute of Japan, Japan, APMP

NMi-VSL

Nederlands Meetinstituut - Van Swinden Laboratorium (became VSL in 2009), Netherlands, EURAMET

NPL

National Physical Laboratory, United Kingdom, EURAMET

NRC

National Research Council, Canada, SIM

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

SMD

Service de la Métrologie Belge, Belgium, EURAMET

SMU

Slovensky Metrologicky Ustav, Slovakia, EURAMET

SP

Technical Research Institute of Sweden from 2017 Research Institutes of Sweden AB, Sweden, EURAMET

VNIIM

D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET

Comparison
Comparison close
Results

BIPM.EM-K10.b, SIM.EM.BIPM-K10.b, SIM.EM.BIPM-K10.b.1, and COOMET.EM.BIPM-K10.b

MEASURAND : DC voltage, Josephson standards
NOMINAL VALUE : 10 V

  • Key comparison BIPM.EM-K10.b
The key comparison reference value is the BIPM value. Since 2004, its standard uncertainty has been evaluated to be typically 0.04 nV and is included in the ui's values.
The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms:
Di = xi and its expanded uncertainty (k = 2), Ui = 2 ui, both expressed in nV.
When required, the degree of equivalence between two laboratories i and j can be computed by a pair of terms:
Dij = Di - Dj = (xi - xj) and its expanded uncertainty (k = 2), Uij, both expressed in nV. Uij = 2[ui2 + uj2 - 2cov(i, j)]1/2, where cov(i, j) is the estimated covariance that takes into account the correlation introduced by the BIPM measurements.
  • Linking SIM.EM.BIPM-K10.b to BIPM.EM-K10.b
The degree of equivalence of NIST with respect to the key comparison reference value is given by a pair of terms:
DNIST = (dNIST-NRC + DNRC) and its expanded uncertainty (k = 2),
UNIST = (UNIST-NRC2 + UNRC2)1/2, both expressed in nV.
No pair-wise degrees of equivalence involving NIST as participant in SIM.EM.BIPM-K10.b have been explicitely computed.
  • Linking SIM.EM.BIPM-K10.b.1 to BIPM.EM-K10.b
The degree of equivalence of INMETRO with respect to the key comparison reference value is given by a pair of terms:
DINMETRO = (dINMETRO-NIST + DNIST) and its expanded uncertainty (k = 2),
UINMETRO = 2[uINMETRO-NIST2 + (UNIST/2
)2]1/2, both expressed in nV. The values taken for NIST are the most recent ones (2009).
No pair-wise degrees of equivalence involving INMETRO as participant in SIM.EM.BIPM-K10.b.1 have been explicitely computed.
  • Linking COOMET.EM.BIPM-K10.b to BIPM.EM-K10.b
The degree of equivalence of BelGIM with respect to the key comparison reference value is given by a pair of terms:
DBelGIM = (dBelGIM-VNIIM + DVNIIM) and its expanded uncertainty (k = 2),
UBelGIM = (UBelGIM-VNIIM2 + UVNIIM2)1/2, both expressed in nV.
No pair-wise degrees of equivalence involving BelGIM as participant in COOMET.EM.BIPM-K10.b have been explicitely computed.
Comparison
Comparison close
Results

BIPM.EM-K10.b, SIM.EM.BIPM-K10.b, SIM.EM.BIPM-K10.b.1, and COOMET.EM.BIPM-K10.b

  • Key comparison BIPM.EM-K10.b

MEASURAND : DC voltage, Josephson standards
NOMINAL VALUE : 10 V

xi : result of measurement carried out by laboratory i expressed as the difference from the BIPM value
ui : combined standard uncertainty of xi

 Lab i xi
/ nV
ui
/ nV
Date of measurement
       
 LNE 1.2 1.2 May 1994
 PTB -0.3 0.5 Jan 1998
 SP 1.4 1.2 Jan 1998
 SMU 14 11 May 1999
 NPL

-1.5

2.2

Sep 2004

 NRC

2.8

3.1

Oct 2004

 CEM

0.4

1.5

Sep 2005

 NMIJ

-1.2

1.3

Oct 2005

 BEV

1.1

3.5

Nov 2005

 INETI

0.8

4.6

Mar 2006

 INMETRO

19

16

Apr 2006

 NMIA

0.9

1.7

May 2006

 VSL

-1.5

1.8

Oct 2006

 KRISS

1.7

1.3

Feb 2008

 LNE (1)

-4.3

1.5

Dec 2007

 LNE (2)

-0.1

0.1

Dec 2007

 NIST (1)

1.5

1.4

Mar 2009

 NIST (2)

-0.8

1.0

Mar 2009

 SMD (1)

0.3

3.3

Nov 2009

 SMD (2)

-0.4

1.3

Nov 2009

 EIM (1)

11.0

17.1

Mar 2010

 EIM (2)

-0.6

2.0

Mar 2010

 A*STAR (1)

-39.0

6.3

Sep 2010

 A*STAR (2)

0.4

1.0

Sep 2010

 VNIIM (1)

1.1

2.9

Nov 2010

 VNIIM (2)

-0.1

2.0

Nov 2010

 CMI (1)

14.1

11.1

Feb 2011

 CMI (2)

9.6

10.3

Feb 2011

 CENAM (1)

2.5

1.3

Sep 2011

 CENAM (2)

-0.6

0.7

Sep 2011

 METAS

0.3

1.0

Jan 2012

 MSL (1)

-2.9

6.4

Apr 2011

 MSL (2)

2.5

4.0

Apr 2011

 NIM (1) 0.9 3.3 Nov 2013
 NIM (2) -0.2 0.9 Nov 2013
 INM(RO) 3.3 2.6 Jun 2014
 PTB (1) -1.9 1.7 Oct 2014
 PTB (2) 0.7 0.5 Oct 2014
 DMDM (1) -2.6 2.7 Jun 2015
 DMDM (1) -0.1 1.5 Jun 2015
 NIMT (1) -2.4 2.9 Nov 2015
 NIMT (2) -1.0 2.6 Nov 2015

(1) initial result
(2) final result following technical improvements during the comparison

  • Key comparison SIM.EM.BIPM-K10.b

MEASURAND : DC voltage, Josephson standards
NOMINAL VALUE : 10 V


SIM.EM.BIPM-K10.b is a bilateral key comparison between NIST and NRC conducted from August 13 to August 17, 2007.

dNIST-NRC : reported difference between NIST CJVS (Compact Josephson Voltage Standard) and NRC JVS
UNIST-NRC : expanded uncertainty (k = 2) of dNIST-NRC

dNIST-NRC = -0.28 nV
UNIST-NRC = 2.07 nV

  • Key comparison SIM.EM.BIPM-K10.b.1

MEASURAND : DC voltage, Josephson standards
NOMINAL VALUE : 10 V


SIM.EM.BIPM-K10.b.1 is a bilateral key comparison between INMETRO and NIST conducted in June 2009.

dINMETRO-NIST : reported difference between INMETRO JVS and NIST CJVS
uINMETRO-NIST : combined standard uncertainty of dINMETRO-NIST

dINMETRO-NIST = 0.54 nV
uINMETRO-NIST = 1.48 nV

  • Key comparison COOMET.EM.BIPM-K10.b

MEASURAND : DC voltage, Josephson standards
NOMINAL VALUE : 10 V


COOMET.EM.BIPM-K10.b is a bilateral key comparison between VNIIM and BelGIM conducted from September 4 to August 8, 2014.

dBelGIM-VNIIM : reported difference between BelGIM JVS (Josephson Voltage Standard) and VNIIM JVS, obtained using a transportable JVS
UBelGIM-VNIIM : expanded uncertainty (k = 2) of dBelGIM-VNIIM

dBelGIM-VNIIM = 0.99 nV
UBelGIM-VNIIM = 3.0 nV