Comparison
Comparison close
Results

BIPM.EM-K10 and EUROMET.EM.BIPM-K10.a

MEASURAND       DC voltage, Josephson standard

NOMINAL VALUE     1.018 V

 

Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nV.

1.018 V
Di / µV
Participating institutes

BIPM.EM-K10 at 1.018 V previously represented by BIPM.EM-K10.a

For higher resulution graph, please click here.

(a) now LNE

(b) now NMIJ AIST

(c) now VSL

(d) now RISE

(e) now INRiM

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

 

MEASURAND                 DC voltage, Josephson standards

NOMINAL VALUE         10 V

 

Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nV.

10 V
Di / µV
Participating institutes

BIPM.EM-K10 at 10 V previously represented by BIPM.EM-K10.b

For higher resolution graph, please click here.

(a) now  RISE

(b) now NMIJ AIST

(c) now IPQ

(x) The degrees of equivalence are computed using the final result

Comparison
Comparison close
Results

BIPM.EM-K10 and EUROMET.EM.BIPM-K10.a

MEASURAND       DC voltage, Josephson standard

NOMINAL VALUE     1.018 V

 

Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nV.

LABi Di Uneg,i Upos,i
nV
nV
nV
DFM 0.20 0.6
PTB -0.10 0.6
NIST 0.10 0.6
NRC 0.20 0.6
NPL -0.07 1.0
BNM-LCIE (a) -0.12 0.3
NMIJ (b) -0.04 0.4
NMi-VSL (c) 0.20 0.4
KRISS 0.20 0.4
MSL -0.24 0.4
NMIA -0.02 0.3
NIM -0.01 0.2
SP (d) 0.10 0.6
IEN (e) 0.10 0.4
CEM 0.00 0.4
NMC A*STAR 1.80 1.8
INTI -1.06 4.0
METAS 0.28 0.9
VNIIM 0.0 0.5
UME 0.1 0.8
PTB 0.1 0.5
SP 0.0 2.3
NPL -1.2 1.2
DFM 0.2 1.1
IEN 0.0 0.7
EIM -0.9 4.5
MIKES 0.1 0.4
GUM 1.3 6.2
CMI -0.7 5.1
NMi-VSL 1.7 12.4
Participating institutes
BIPM.EM-K11
EUROMET.EM.BIPM-10.a

BIPM.EM-K10 at 1.018 V previously represented by BIPM.EM-K10.a

(a) now LNE

(b) now NMIJ AIST

(c) now VSL

(d) now RISE

(e) now INRiM

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

 

MEASURAND                 DC voltage, Josephson standards

NOMINAL VALUE         10 V

 

Degrees of equivalence represented by Di = (xI - xR) and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in nV.

LABi Di Uneg,i Upos,i
nV
nV
nV
SP (a) 1.4 2.4
SMU 14.0 22.0
NPL -1.5 4.4
NRC 2.8 6.2
CEM 0.4 3.0
NMIJ (b) -1.2 2.6
BEV 1.1 7.0
INETI (c) 0.8 9.2
INMETRO (2006) 19.0 32.0
NMIA 0.9 3.4
VSL -1.5 3.6
KRISS 1.7 2.6
LNE (x) -0.1 0.2
NIST (2006)(x) -0.8 1.9
SMD (x) -0.4 2.7
EIM (x) -0.6 4.0
NMC, A*STAR (x) 0.4 1.9
VNIIM (x) -0.1 4.1
CMI (x) 9.6 20.6
CENAM (x) -0.6 1.3
METAS 0.3 2.0
MSL (x) 2.5 8.0
NIM (x) -0.2 1.8
INM(RO) 3.3 5.2
PTB (x) 0.7 1.0
DMDM (x) -0.1 3.0
NIMT (x) -1.0 5.2
MIKES 2.2 4.1
NIST 2.5 6.5
INMETRO (2009) 0.30 3.5
BELGIM 0.9 5.2
Participating institutes
BIPM.EM-K10
SIM.EM.BIPM-K10.b
SIM.EM.BIPM-K10.b.1
COOMET.EM.BIPM-K10.b

BIPM.EM-K10 at 10 V previously represented by BIPM.EM-K10.b

(a) now  RISE

(b) now NMIJ AIST

(c) now IPQ

(x) The degrees of equivalence are computed using the final result

BIPM.EM-K10
Metrology area, Sub-field Electricity and Magnetism, DC Voltage and Current
Description DC voltage, Josephson standards
Time of measurements 1991 -
Status Continuous, approved for equivalence
References

BIPM.EM-K10 Technical Protocol Option A

BIPM.EM-K10 Technical Protocol Option B

Measurand DC voltage
1.018 V and 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 Most recent update of BIPM.EM-K10 results: 21 September 2021
From 21 September 2021, BIPM.EM-K10 covers the two former comparisons BIPM.EM-K10.a and BIPM.EM-K10.b.
Pilot institute BIPM
Bureau International des Poids et Mesures
BIPM - International Organization
Contact person S. Solve

+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

DFM

Danish Fundamental Metrology Ltd, Denmark, EURAMET

DMDM

Directorate of Measures and Precious Metals, Serbia, EURAMET

EIM

Hellenic Institute of Metrology, Greece, EURAMET

INM

National Institute of Metrology, Romania, EURAMET

INMETRO

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

INRIM

Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET

INTI

Instituto Nacional de Tecnologia Industrial, Argentina, SIM

IPQ

Instituto Portugues da Qualidade, Portugal, EURAMET

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

MIKES

VTT Technical Research Centre of Finland Ltd, Centre for Metrology/Mittatekniikan keskus, Finland, 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

NPL

National Physical Laboratory, United Kingdom, EURAMET

NRC

National Research Council, Canada, SIM

PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

RISE

Research Institutes of Sweden AB, Sweden, EURAMET

SMD

Service de la Métrologie Belge, Belgium, EURAMET

SMU

Slovensky Metrologicky Ustav, Slovakia, EURAMET

VNIIM

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

VSL

VSL, Netherlands, EURAMET

Comparison
Comparison close
Results

BIPM.EM-K10 and EUROMET.EM.BIPM-K10.a

MEASURAND       DC voltage, Josephson standard

NOMINAL VALUE     1.018 V

 

The key comparison reference value is the BIPM value. Its standard uncertainty is evaluated to be 0.1 nV and is included in the ui values.

The degree of equivalence between two laboratories i and j can be estimated as Dij = Di - Dj = (xi - xj) and its expanded uncertainty (k = 2), Uij, both expressed in nV, where Uij = 2[ui2 + uj2 - 2cov(ij)]1/2. cov(ij) << (0.1 nV)2 is the estimated covariance that takes into account the correlation introduced by the BIPM measurements. This term is negligible.

 

Linking EUROMET.EM.BIPM-K10.a to BIPM.EM-K10

The results issued from EUROMET.EM.BIPM-K10.a were linked to BIPM.EM-K10 via the BIPM who participated in both comparisons. Detailed information on the linking is given on page 6 of the EUROMET.EM.BIPM-K10.a Final Report.

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

 

MEASURAND                 DC voltage, Josephson standards

NOMINAL VALUE         10 V

 

BIPM.EM-K10 

 

The key comparison reference value is the BIPM value. Its standard uncertainty is evaluated to be 0.04 nV and is included in the ui 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 estimated as Dij = Di - Dj = (xi - xj) and its expanded uncertainty (k = 2), Uij, both expressed in nV, where Uij = 2[ui2 + uj2 - 2cov(ij)]1/2. cov(ij) << (0.1 nV)2 is the estimated covariance that takes into account the correlation introduced by the BIPM measurements. This term is negligible.

 

Linking SIM.EM.BIPM-K10.b to BIPM.EM-K10

The results issued from SIM.EM.BIPM-K10.b were linked to BIPM.EM-K10 via NRC, having participated in both comparisons.

 

Linking SIM.EM.BIPM-K10.b.1 to BIPM.EM-K10

The results issued from SIM.EM.BIPM-K10.b.1 were linked to BIPM.EM-K10 via NIST, having participated in both comparisons.

 

Linking COOMET.EM.BIPM-K10.b to BIPM.EM-K10

The results issued from SIM.EM.BIPM-K10.b were linked to BIPM.EM-K10 via VNIIM, having participated in both comparisons.

Comparison
Comparison close
Results

BIPM.EM-K10 and EUROMET.EM.BIPM-K10.a

MEASURAND       DC voltage, Josephson standard

NOMINAL VALUE     1.018 V

 

BIPM.EM-K10 

 

xi   measured voltage difference reported by laboratory iLabi

ui   combined standard uncertainty of xi

 

(a) now LNE

(b) now NMIJ AIST

(c) now VSL

(d) now RISE

(e) now INRiM

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

 

MEASURAND                 DC voltage, Josephson standards

NOMINAL VALUE         10 V

 

BIPM.EM-K10 

 

xi   measured voltage difference reported by laboratory iLabi

ui   combined standard uncertainty of xi

 

 

(a) now  RISE

(b) now NMIJ AIST

(c) now IPQ

(1) initial result

(2) final result following technical improvements during the comparison