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

SIM.EM.BIPM-K10.b.1
Metrology area, Sub-field Electricity and Magnetism, DC Voltage and Current
Description DC voltage, Josephson standards
Time of measurements 2009
Status Approved for equivalence
Final Reports of the comparisons
Measurand DC voltage: 10 V (direct comparison of Josephson voltage standards)
Transfer device Compact Josephson Voltage Standard (CJVS)
Comparison type Key Comparison
Consultative Committee CCEM (Consultative Committee for Electricity and Magnetism)
Conducted by SIM (Inter-American Metrology System)
Comments Results published on 11 March 2010
SIM.EM.BIPM-K10.b.1 results are linked to those of BIPM.EM-K10.b.
DC voltage, Josephson standards, 10 V

 
Pilot institute NIST
National Institute of Standards and Technology
United States
Contact person Yi-Hua Tang

+1 301 975 4691
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
NIST

National Institute of Standards and Technology, United States, SIM

INMETRO

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

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