Comparison Display

Comparison

Comparison close

BIPM.EM-K11, APMP.EM.BIPM-K11.1, COOMET.EM.BIPM-K11.a, EUROMET.EM.BIPM-K11.6, COOMET.EM.BIPM-K11, APMP.EM.BIPM-K11.4, APMP.EM.BIPM-K11.3, APMP.EM.BIPM-K11.5 and GULFMET.EM.BIPM-K11

MEASURAND DC voltage, Zener diode

NOMINAL VALUE 1.018 V

Degrees of equivalence represented by D_i and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in µV.

1 V

D_i / µV

Participating institutes

BIPM.EM-K11

APMP.EM.BIPM-K11.1

COOMET.EM.BIPM-K11.a

EUROMET.EM.BIPM-K11.6

COOMET.EM.BIPM-K11

APMP.EM.BIPM-K11.4

APMP.EM.BIPM-K11.3

APMP.EM.BIPM-K11.5

GULFMET.EM.BIPM-K11

BIPM.EM-K11 at 1.018 V previously represented as BIPM.EM-K11.a

For higher resolution graph, please click here.

Comparison

Comparison close

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BIPM.EM-K11, APMP.EM.BIPM-K11.1, COOMET.EM.BIPM-K11.a, EUROMET.EM.BIPM-K11.6, COOMET.EM.BIPM-K11, APMP.EM.BIPM-K11.4, APMP.EM.BIPM-K11.3, APMP.EM.BIPM-K11.5 and GULFMET.EM.BIPM-K11

MEASURAND DC voltage, Zener diode

NOMINAL VALUE 1.018 V

Degrees of equivalence represented by D_i and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in µV.

LAB_i	D_i	U_i
	µV	µV
VNIIM	0.00	0.05
CMI	0.10	1.56
BEV	-0.01	0.03
SMU	-0.09	0.08
GUM	0.00	0.08
NMIA	0.03	0.05
KRISS	0.07	0.10
INTI	-0.01	0.06
INM (RO)	-0.01	0.10
DMDM	0.09	0.14
NIS	0.09	0.16
NIMT	0.16	0.28
JV	0.23	0.06
NMISA	0.07	0.04
KEBS	0.11	0.68
BIM	-0.01	0.05
SMD	-0.03	0.26
DEFNAT	0.03	0.06
NPLI	-2.91	1.36
SASO-NMCC	0.06	0.10
INRIM	-0.04	0.06
NSAI NML	-0.20	0.16
SCL	0.07	0.12
BelGIM	0.05	0.43
INM (RO)	0.29	0.57
BelGIM	-0.01	0.07
VMI-STAMEQ	0.10	0.20
NMIA	0.00	0.13
NMC A*STAR	0.02	0.13
NML SIRIM	0.01	0.13
CMS ITRI	0.00	0.14
NMIJ	0.05	0.13
NIMT	0.04	0.13
SCL	0.01	0.13
KazInMetr	-0.22	0.15
NMIJ	0.07	0.10
CMS	0.10	0.11
SCL	0.03	0.14
QCC EMI	0.11	2.53
SASO-NMCC	-0.10	0.78
IMBIH	-0.49	0.98

Participating institutes

BIPM.EM-K11

APMP.EM.BIPM-K11.1

COOMET.EM.BIPM-K11.a

EUROMET.EM.BIPM-K11.6

COOMET.EM.BIPM-K11

APMP.EM.BIPM-K11.4

APMP.EM.BIPM-K11.3

APMP.EM.BIPM-K11.5

GULFMET.EM.BIPM-K11

BIPM.EM-K11 at 1.018 V previously represented as BIPM.EM-K11.a

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BIPM.EM-K11, EUROMET.EM.BIPM-K11, APMP.EM.BIPM-K11.1, EUROMET.EM.BIPM-K11.5, EUROMET.EM.BIPM-K11.6, SIM.EM.BIPM-K11.b, COOMET.EM.BIPM-K11, APMP.EM.BIPM-K11.4, APMP.EM.BIPM-K11.3, APMP.EM.BIPM-K11.5 and GULFMET.EM.BIPM-K11

MEASURAND DC voltage, Zener diode

NOMINAL VALUE 10 V

Degrees of equivalence represented by D_i and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in µV.

LAB_i	D_i	U_i
	µV	µV
SPRING Singapore (b)	0.16	0.22
NIST	0.26	0.28
METAS	-0.14	0.28
CMI	0.77	1.46
BEV	-0.04	0.20
SMU	-0.04	1.72
GUM	-0.06	0.26
NMIA	0.13	0.28
VNIIM	-0.22	0.68
KRISS	-0.03	0.20
INTI	-0.24	0.76
INM (RO)	-0.43	0.68
DMDM	0.39	0.24
NIS	0.22	0.28
NIMT	-0.03	0.22
JV	0.63	0.56
NMISA	0.00	0.68
KEBS	0.25	3.10
BIM	0.30	0.18
NSAI NML	-2.99	3.42
SMD	0.02	0.56
DEFNAT	0.44	0.24
NPLI	-4.97	0.38
SASO-NMCC	0.22	0.24
INRIM	-0.18	0.38
NSAI NML	-0.02	0.26
LNE	0.35	0.59
NPL	-0.36	0.49
NML (IE)	-0.18	4.13
UME	-0.05	0.48
DFM	-0.01	0.50
SP	-0.07	0.50
MIKES	-0.11	0.52
JV	-0.30	0.51
SMD	-0.20	3.73
CMI	0.73	1.54
BEV	-0.19	0.61
SMU	-0.17	0.49
NMi-VSL	-0.16	0.50
CEM	0.31	0.49
INETI	-2.69	6.52
METAS	0.00	0.49
PTB	0.15	0.49
EIM	-0.55	0.56
MIRS/SIQ	0.30	6.11
OMH	-0.65	6.49
SCL	-0.33	0.60
INM(RO)	3.34	5.06
VMT/PFI	-0.11	0.58
CENAM	0.23	0.28
BelGIM	-0.28	0.88
VMI-STAMEQ	-1.21	2.76
NMIA	-0.27	0.62
NMC A*STAR	-0.23	0.63
NML SIRIM	-0.02	0.63
CMS ITRI	-0.06	0.66
NMIJ	0.24	0.62
NIMT	0.40	0.63
SCL	0.06	0.62
KazInMetr	-0.37	0.65
NMIJ	0.18	0.67
CMS	-0.10	0.69
SCL	0.04	0.40
QCC EMI	4.49	7.34
SASO-NMCC	-0.09	3.55
IMBIH	-0.33	4.84

Participating institutes

BIPM.EM-K11

EUROMET.EM.BIPM-K11

APMP.EM.BIPM-K11.1

EUROMET.EM.BIPM-K11.6

EUROMET.EM.BIPM-K11.5

SIM.EM.BIPM-K11.b

COOMET.EM.BIPM-K11

APMP.EM.BIPM-K11.4

APMP.EM.BIPM-K11.3

APMP.EM.BIPM-K11.5

GULFMET.EM.BIPM-K11

(b) now NMC, A*STAR

BIPM.EM-K11 at 10 V previously represented as BIPM.EM-K11.b

BIPM.EM-K11

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Information & contact
Participants

Metrology area, Sub-field	Electricity and Magnetism, DC Voltage and Current
Description	DC voltage, Zener diode
Time of measurements	1992 -
Status	Continuous, approved for equivalence

References	BIPM.EM-K11 Technical protocol
Measurand	DC voltage 1.018 V (BIPM.EM-K11.a) 10 V (BIPM.EM-K11.b)
Transfer device	Zener diode-based electronic standards

Comparison type	Key Comparison
Consultative Committee	CCEM (Consultative Committee for Electricity and Magnetism)
Conducted by	BIPM (Bureau International des Poids et Mesures)
Comments	From 10 August 2021, BIPM.EM-K11 covers the two former comparisons BIPM.EM-K11.a and BIPM.EM-K11.b. Date of results last update: 14 June 2024
Pilot institute	BIPM Bureau International des Poids et Mesures BIPM - International Organization
Contact person	S. Solve +33 (0) 1 45 07 70 26

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

BEV	Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET
2001	Rapport BIPM-01/03 BIPM Publications 2001
1995	Metrologia 1996 33 271-287
1993	Metrologia 1994 31 63-68

BIM	Bulgarian Institute of Metrology, Bulgaria, EURAMET
2019	Metrologa 2021 58 Tech. Suppl. 01005
2006	Rapport BIPM-06/05 BIPM Publications 2006 Comparison carried out with National Centre of Metrology - NCM

CMI	Czech Metrology Institute, Czechia, EURAMET
2000	Rapport BIPM-00/03 BIPM Publications 2000

DEF-NAT	Laboratoire de Métrologie de la Direction Générale des Transmissions et de l'Informatique, Tunisia, AFRIMETS
2016	Metrologia 2016 53 Tech. Suppl. 01004
2022	Metrologia 2023 60 Tech. Supp. 01003

DMDM	Directorate of Measures and Precious Metals, Serbia, EURAMET
2014	Metrologia 2015 52 Tech. Suppl. 01025

GUM	Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET
2001	Rapport BIPM-01/06 BIPM Publications 2001

INM	National Institute of Metrology, Romania, EURAMET
2013	Metrologia, 2014 51 Tech. Suppl. 01005

INRIM	Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET
1996	BIPM Proc.-Verb.CIPM 1996 64 188 Comparison carried out with Istituto Elettrotecnico Nazionale Galileo Ferraris - IEN
2023	Metrologia 2024 61 Tech. Suppl. 01004

INTI	Instituto Nacional de Tecnologia Industrial, Argentina, SIM
2009	Metrologia, 2010 47 Tech. Suppl. 01002

IPQ	Instituto Portugues da Qualidade, Portugal, EURAMET
1994	Metrologia 1996 33 271-287 Comparison carried out with Laboratorio Nacional de Engenharia e Tecnologia Industrial - LNETI

JV	Justervesenet, Norway, EURAMET
2015	Metrologia, 2015 52 Tech. Suppl. 01022
1997	Rapport BIPM-98/12 BIPM Publications 1998

KEBS	Kenya Bureau of Standards, Kenya, AFRIMETS
2018	Metrologia 2018 55 Tech. Suppl. 01007

KRISS	Korea Research Institute of Standards and Science, Korea, Republic of, APMP
2008	Metrologia 2008 45 Tech. Suppl. 01007

METAS	Federal Institute of Metrology, Switzerland, EURAMET
1999	Rapport BIPM-99/15 BIPM Publications 1999 Comparison carried out with Office Fédéral de Métrologie - OFMET

NIMT	National Institute of Metrology (Thailand), Thailand, APMP
2014	Metrologia 2015 52 Tech. Suppl. 01019

NIS	National Institute for Standards, Egypt, AFRIMETS
2014	Metrologia 2015 52 Tech. Suppl. 01011

NIST	National Institute of Standards and Technology, United States, SIM
1998	Rapport BIPM-99/07 BIPM Publications 1999

NMC, A*STAR	National Metrology Centre, Agency for Science, Technology and Research, Singapore, APMP
1998	Rapport BIPM-98/13 BIPM Publications 1998 Comparison carried out with Singapore Standards, Productivity and Innovation Board - SPRING Singapore

NMIA	National Measurement Institute, Australia, Australia, APMP
2003	Rapport BIPM-04/03 BIPM Publications 2004 Comparison carried out with CSIRO National Measurement Laboratory

NMISA	National Metrology Institute of South Africa, South Africa, AFRIMETS
2017	Metrologia 2018 55 Tech. Suppl. 01001
2003	Rapport BIPM-04/02 BIPM Publications 2004 Comparison carried out as Council for Scientific and Industrial Research, National Metrology Laboratory - CSIR-NML

NPLI	CSIR National Physical Laboratory of India, India, APMP
2023	Metrologia 2023 60 Tech. Supp. 01009

NSAI NML	NSAI National Metrology Laboratory, Ireland, EURAMET
2024	Metrologia 2024 61 Tech. Suppl. 01011
2020	Metrologia 2021 58 Tech. Suppl. 01006
2018	Metrologia 2019 56 Tech. Suppl. 01004
2016	Metrologia 2016 53 Tech. Suppl. 01007
2015	Metrologia 2015 52 Tech. Suppl. 01021 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2014	Metrologia 2014 51 Tech. Suppl. 01008 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2013	Metrologia 2014 51 Tech. Suppl. 01006 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2012	Metrologia 2012 49 Tech. Suppl. 01014 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2011	Metrologia 2011 48 Tech. Suppl. 01010 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2010	Metrologia 2010 47 Tech. Suppl. 01017 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2009	Metrologia 2009 46, Tech. Suppl. 01008 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2008	Metrologia 2008 45 Tech. Suppl. 01008 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2007	Rapport BIPM-07/03 BIPM Publications 2007 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2006	Rapport BIPM-06/04 BIPM Publications 2006 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2005	Rapport BIPM-05/04 BIPM Publications 2005 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2004	Rapport BIPM-04/09 BIPM Publications 2004 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2003	Rapport BIPM-03/06 BIPM Publications 2003 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2002	Rapport BIPM-02/05 BIPM Publications 2002 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2001	Rapport BIPM-01/02 BIPM Publications 2001 Carried out as National Metrology Laboratory of Ireland - NML (IE)
2000	Rapport BIPM-00/02 BIPM Publications 2000 Carried out as National Metrology Laboratory of Ireland - NML (IE)
1999	Rapport BIPM-99/16 BIPM Publications 1999 Carried out as National Metrology Laboratory of Ireland - NML (IE)
1998	Rapport BIPM-98/14 BIPM Publications 1998 Carried out as National Metrology Laboratory of Ireland - NML (IE)
1997	BIPM Proc.-Verb. CIPM 1997 65 318 Carried out as National Metrology Laboratory of Ireland - NML (IE)
1996	BIPM Proc.-Verb CIPM, 1996 64 188 Carried out as National Metrology Laboratory of Ireland - NML (IE)
1995	Metrologia 1996 33 271-287 Carried out as National Metrology Laboratory of Ireland - NML (IE)
1994	Metrologia 1996 33 271-287 Carried out as National Metrology Laboratory of Ireland - NML (IE)
1992	Metrologia 1994 31 63-68 Carried out as National Metrology Laboratory of Ireland - NML (IE)

SASO-NMCC	National Measurement and Calibration Center - Saudi Standards, Metrology and Quality Organization, Saudi Arabia, GULFMET
2023	Metrologia 2024 61 Tech. Suppl. 01005

SMD	Service de la Métrologie Belge, Belgium, EURAMET
2014	Metrologia, 2015 52 Tech. Suppl. 01020
2021	Metrologia 2022 59 Tech. Suppl. 01005

SMU	Slovensky Metrologicky Ustav, Slovakia, EURAMET
2001	Rapport BIPM-01/05 BIPM Publications 2001
1998	Rapport BIPM-99/01 BIPM Publications 1999

VNIIM	D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET
2007	Rapport BIPM-07/07 BIPM Publications 2007
1998	Rapport BIPM-99/02 BIPM Publications 1999

Comparison

Comparison close

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BIPM.EM-K11, APMP.EM.BIPM-K11.1, COOMET.EM.BIPM-K11.a, EUROMET.EM.BIPM-K11.6, COOMET.EM.BIPM-K11, APMP.EM.BIPM-K11.4, APMP.EM.BIPM-K11.3, APMP.EM.BIPM-K11.5 and GULFMET.EM.BIPM-K11

MEASURAND DC voltage, Zener diode

NOMINAL VALUE 1.018 V

The key comparison reference value is the BIPM value. Its standard uncertainty is evaluated to be 0.01 µV and is included in the u_i's values.

The degree of equivalence of laboratory i with respect to the key comparison reference value x_R is given by a pair of terms: D_i = (x_I - x_R) and its expanded uncertainty U_i = 2u_iat a 95 % level of confidence, both expressed in µV.

Linking APMP.EM.BIPM-K11.1 to BIPM.EM-K11

The linking of APMP.EM.BIPM-K11.1 to BIPM.EM-K11 is made via NMIA (Australia), having participated in both comparisons.

Linking COOMET.EM.BIPM-K11.a to BIPM.EM-K11

The linking of COOMET.EM.BIPM-K11.a to BIPM.EM-K11 is made via VNIIM (Russia) having participated in both comparisons.

Linking EUROMET.EM.BIPM-K11.6 to BIPM.EM-K11

The linking of EUROMET.EM.BIPM-K11.6 to BIPM.EM-K11 is made via BEV (Austria) and UME (Turkey), having participated in both comparisons.

Linking COOMET.EM.BIPM-K11 to BIPM.EM-K11

The linking of COOMET.EM.BIPM-K11 to BIPM.EM-K11 is made via VNIIM (Russia), having participated in both comparisons.

Linking APMP.EM.BIPM-K11.4 to BIPM.EM-K11

The linking of APMP.EM.BIPM-K11.4 to BIPM.EM-K11 is made via KRISS (Korea), having participated in both comparisons.

Linking APMP.EM.BIPM-K11.3 to BIPM.EM-K11.a

The linking of APMP.EM.BIPM-K11.3 to BIPM.EM-K11 is made via NIM (China), KRISS (Korea) and the BIPM, having participated in both comparisons.

Linking APMP.EM.BIPM-K11.5 to BIPM.EM-K11

The linking of APMP.EM.BIPM-K11.5 to BIPM.EM-K11 is made via KRISS (Korea), having participated in both comparisons.

Linking GULFMET.EM.BIPM-K11 to BIPM.EM-K11

The linking of GULFMET.EM.BIPM-K11 to BIPM.EM-K11 is made via KRISS (Korea) and BIPM, having participated in both comparisons.

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MEASURAND DC voltage, Zener diode

NOMINAL VALUE 10 V

The key comparison reference value is the BIPM value, x_R. Its standard uncertainty u_R is evaluated to be 0.1 µV and is included in the u_i values.

Linking EUROMET.EM.BIPM-K11 to BIPM.EM-K11

The linking of EUROMET.EM.BIPM-K11 to BIPM.EM-K11 is made via BIPM, having participated in both comparisons.

Linking APMP.EM.BIPM-K11.1 to BIPM.EM-K11

The linking of APMP.EM.BIPM-K11.1 to BIPM.EM-K11 is made via NMIA (Australia), having participated in both comparisons.

Linking EUROMET.EM.BIPM-K11.5 to BIPM.EM-K11

The linking of EUROMET.EM.BIPM-K11.5 to BIPM.EM-K11 is made via DFM (Denmark), having participated in both comparisons.

Linking EUROMET.EM.BIPM-K11.6 to BIPM.EM-K11

The linking of EUROMET.EM.BIPM-K11.6 to BIPM.EM-K11 is made via BEV (Austria) and UME (Turkey), having participated in both comparisons.

Linking SIM.EM.BIPM-K11.b to BIPM.EM-K11

The linking of SIM.EM.BIPM-K11.b to BIPM.EM-K11 is made via NIST (United States), having participated in both comparisons.

Linking COOMET.EM.BIPM-K11 to BIPM.EM-K11

The linking of COOMET.EM.BIPM-K11 to BIPM.EM-K11 is made via VNIIM (Russia), having participated in both comparisons.

Linking APMP.EM.BIPM-K11.4 to BIPM.EM-K11

The linking of APMP.EM.BIPM-K11.4 to BIPM.EM-K11 is made via KRISS (Korea), having participated in both comparisons.

Linking APMP.EM.BIPM-K11.3 to BIPM.EM-K11

The linking of APMP.EM.BIPM-K11.3 to BIPM.EM-K11 is made via NIM (China), KRISS (Korea) and the BIPM, having participated in both comparisons.

Linking APMP.EM.BIPM-K11.5 to BIPM.EM-K11

The linking of APMP.EM.BIPM-K11.5 to BIPM.EM-K11 is made via KRISS (Korea), having participated in both comparisons.

Linking GULFMET.EM.BIPM-K11 to BIPM.EM-K11

The linking of GULFMET.EM.BIPM-K11 to BIPM.EM-K11 is made via KRISS (Korea) and BIPM, having participated in both comparisons.

Comparison

Comparison close

print out

BIPM.EM-K11, APMP.EM.BIPM-K11.1, COOMET.EM.BIPM-K11.a, EUROMET.EM.BIPM-K11.6, COOMET.EM.BIPM-K11, APMP.EM.BIPM-K11.4, APMP.EM.BIPM-K11.3, APMP.EM.BIPM-K11.5 and GULFMET.EM.BIPM-K11

MEASURAND DC voltage, Zener diode

NOMINAL VALUE 1.018 V

BIPM.EM-K11

x_i measured voltage difference reported by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

Lab_i	x_i	u_i	year of
	µV	µV	measurement
VNIIM	0	0.027	1998
CMI	0.1	0.78	2000
BEV	-0.013	0.017	2001
SMU	-0.091	0.042	2001
GUM	0	0.038	2001
NMIA	0.028	0.026	2003
KRISS	0.07	0.048	2008
INTI	-0.01	0.03	2009
INM (RO)	-0.014	0.051	2013
DMDM	0.094	0.072	2014
NIS	0.09	0.08	2014
NIMT	0.16	0.14	2014
JV	0.23	0.03	2015
NMISA	0.07	0.02	2017
KEBS	0.11	0.34	2018
BIM	-0.01	0.02	2019
SMD	-0.03	0.13	2021
DEFNAT	0.03	0.03	2022
NPLI	-2.91	0.68	2021
SASO-NMCC	0.06	0.05	2023
INRIM	-0.04	0.03	2023
NSAI NML	-0.20	0.082	2024

Green backgroud represents institutes using Josephson voltage standard

KCDB

CIPM MRA

CLASSIFICATION OF SERVICES

Lab_i	x_i	u_i	date of
	µV	µV	measurement
SPRING Singapore (b)	0.16	0.11	Apr 1998
NIST	0.26	0.14	Nov 1998
METAS	-0.14	0.14	Apr 1999
CMI	0.77	0.73	Apr 2000
BEV	-0.04	0.10	Apr 2001
SMU	-0.04	0.86	Apr 2001
GUM	-0.06	0.13	May 2001
NMIA	0.13	0.14	Nov 2003
VNIIM	-0.22	0.34	Sep 2007
KRISS	-0.031	0.10	Feb 2008
INTI	-0.24	0.38	Sep 2009
INM(RO)	-0.43	0.34	Aug 2013
DMDM	0.39	0.12	Feb 2014
NIS	0.22	0.14	Sep 2014
NIMT	-0.03	0.11	Nov 2014
JV	0.63	0.28	Jan 2015
NMISA	0.00	0.34	May 2017
KEBS	0.25	1.55	Feb 2018
BIM	0.30	0.09	Oct 2019
SMD	0.02	0.28	Oct 2021
DEFNAT	0.44	0.12	May 2022
NPLI	-4.97	0.19	Apr 2022
SASO-NMCC	0.22	0.12	Sep 2023
INRIM	-0.18	0.19	Dec 2023
NSAI NML	-0.02	0.13	May 2024

	Green backgroud represents institutes using Josephson voltage standard
(b)	now NMC, A*STAR

Key and supplementary comparisons - Print out