Comparison
Comparison close
Results

CCEM-K2, EUROMET.EM-K2, EURAMET.EM-K2.1 and APMP.EM-K2

MEASURAND   Resistance

NOMINAL VALUE 10 MΩ

 

Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), relative to the CCEM-K2 key comparison reference value, expressed in 10-6.

 Resistance: 10 MΩ
Di / 10-6
Participating institutes

Click here for enlaged graph
APMP.EM-K2_10MΩ

CCEM-K2, SIM.EM-K2, EUROMET.EM-K2, EURAMET.EM-K2.1 and APMP.EM-K2

MEASURAND   Resistance

NOMINAL VALUE 1 GΩ

 

Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), relative to the CCEM-K2 key comparison reference value, expressed in 10-6.

 Resistance: 1 GΩ
Di / 10-6
Participating institutes

Click here for enlarged graph

APMP.EM-K2_Graph-1GΩ

Comparison
Comparison close
Results

CCEM-K2, EUROMET.EM-K2, EURAMET.EM-K2.1 and APMP.EM-K2

MEASURAND   Resistance

NOMINAL VALUE 10 MΩ

 

Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), relative to the CCEM-K2 key comparison reference value, expressed in 10-6.

LABi Di Uneg,i Upos,i
10-6
10-6
10-6
NIST -0.3 2.9
NRC -1.2 5.7
LNE 0.0 2.1
NPL -0.3 2.3
PTB 0.0 5.0
NMIA -0.3 5.4
MSL -0.4 2.1
NMISA -16 79
RISE 0.6 4.0
METAS 0.7 2.1
INRIM 0.9 5.5
VSL 0.6 6.4
KRISS -2.3 6.3
NIM 0.6 2.5
VNIIM -0.1 2.8
MIRS/SIQ/Metrology 1.8 2.2
SMU 7.4 8.7
FTMC -0.3 2.0
MIKES -0.5 2.4
BFKH 0.7 3.7
CMI 0.1 7.2
INM 9.1 6.9
NSAI NML 0.3 14.8
JV 1.3 2.3
IPQ -19.2 21.6
LATMB -3.1 6.7
SMD 4.2 3.0
UME 1.4 7.4
EIM -6.6 13.7
BEV -0.1 3.5
CEM 2.9 2.0
GUM 3.2 2.6
FER-PEL 5.0 2.8
BIM 3.0 4.8
NIS -37.5 98.4
CMS -0.8 4.8
NIMT 6.8 6.7
NMIM 1.6 7.0
NMC, A*STAR 0.4 2.1
NMIJ 1.7 2.0
NMIA -0.6 2.1
NMISA -2.2 5.2
SCL -1.4 5.3
KazStandard -8.8 48.1
Participating institutes
CCEM-K2
EUROMET.EM-K2
EURAMET.EM-K2.1
APMP.EM-K2

CCEM-K2

RISE refers to SP in the final report.

 

EUROMET.EM-K2

MIRS/SIQ/Metrology refers to MIRS/SIQ in the final report.

FTMC refers to VMT/PFI in the final report.

BFKH refers to OMH in the final report.

NSAI NML refers to NML(IE) in the final report.

IPQ refers to INETI/LME in the final report.

LATMB refers to LNMC in the final report.

 

EURAMET.EM-K2.1

FER-PEL refers to HMI/FER-PEL in the final report.

 

APMP.EM-K2

NMIM refers to NML-SIRIM in the final report.

KazStandard refers to KazInMetr in the final report.

CCEM-K2, SIM.EM-K2, EUROMET.EM-K2, EURAMET.EM-K2.1 and APMP.EM-K2

MEASURAND   Resistance

NOMINAL VALUE 1 GΩ

 

Degrees of equivalence, Di and expanded uncertainty Ui (k = 2), relative to the CCEM-K2 key comparison reference value, expressed in 10-6.

LABi Di Uneg,i Upos,i
10-6
10-6
10-6
NIST -0.1 8.6
NRC -0.2 19.8
LNE -1.3 18.0
NPL -7.2 11.0
PTB 3.3 13.0
NMIA 2.1 66.8
MSL 4.6 6.6
NMISA -53 581
RISE -1.6 10.0
METAS 2.9 22.8
INRIM 2.5 19.3
VSL -32.3 36.3
KRISS -1.5 12.4
NIM -0.6 8.3
VNIIM 0.0 7.3
INTI -7.5 12.6
INMETRO -4.2 11.8
UTE -4.3 35.5
CENAM 3.7 16.0
MIRS/SIQ/Metrology -10.7 12.0
SMU -28.4 37.8
FTMC -1.8 8.9
MIKES -1.8 11.4
BFKH 2.0 9.2
CMI 6.7 30.8
INM -44.9 44.5
NSAI NML -3.0 62.3
JV 0.1 14.4
IPQ -33.4 208.5
SMD -2.7 18.6
UME -1.4 12.2
EIM -0.4 17.9
BEV 0.7 18.1
CEM -1.4 7.3
GUM -2.4 12.2
FER-PEL -8.0 39.6
BIM 100.6 211.5
CMS 1.6 10.1
NMIM 7.3 25.5
NMC, A*STAR -5.3 13.1
NMIJ 5.0 5.2
NMIA -1.8 7.5
NMISA 4.0 9.2
SCL 0.8 12.8
KazStandard 227.8 142.8
Participating institutes
CCEM-K2
SIM.EM-K2
EUROMET.EM-K2
EURAMET.EM-K2.1
APMP.EM-K2

CCEM-K2

RISE refers to SP in the final report.

 

EUROMET.EM-K2

MIRS/SIQ/Metrology refers to MIRS/SIQ in the final report.

FTMC refers to VMT/PFI in the final report.

BFKH refers to OMH in the final report.

NSAI NML refers to NML(IE) in the final report.

IPQ refers to INETI/LME in the final report.

 

EURAMET.EM-K2.1

FER-PEL refers to HMI/FER-PEL in the final report.

 

APMP.EM-K2

NMIM refers to NML-SIRIM in the final report.

KazStandard refers to KazInMetr in the final report.

Comparison
Comparison close
CC comparison
Linked comparison
CCEM-K2
Metrology area, Sub-field Electricity and Magnetism, Resistance
Description Comparison of resistance standards
Time of measurements 1996 - 2000
Status Approved for equivalence
Final Reports of the comparisons
Measurand Resistance: 10 megaohms and 1 gigaohm
Parameters Voltage: 10 V, 50 V, 91 V or 100 V
Transfer device Wirewound and film-type resistors
Comparison type Key Comparison
Consultative Committee CCEM (Consultative Committee for Electricity and Magnetism)
Conducted by CCEM (Consultative Committee for Electricity and Magnetism)
Comments

Results published on 11 January 2002

SIM.EM-K2 results (1 gigaohm only), and EUROMET.EM-K2 and EURAMET.EM-K2.1 results (10 megaohms and 1 gigaohm) are linked to those of CCEM-K2

Resistance

Pilot institute NIST
National Institute of Standards and Technology
United States
Contact person R. Dziuba

+1 301 975 4239
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

INRIM

Istituto Nazionale di Ricerca Metrologica, Italy, 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

MSL

Measurement Standards Laboratory, New Zealand, APMP

NIM

National Institute of Metrology, China, APMP

NMIA

National Measurement Institute, Australia, Australia, APMP

NMISA

National Metrology Institute of South Africa, South Africa, AFRIMETS

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

VNIIM

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

VSL

VSL, Netherlands, EURAMET

Comparison
Comparison close
Results

CCEM-K2, EUROMET.EM-K2, EURAMET.EM-K2.1 and APMP.EM-K2

MEASURAND   Resistance

NOMINAL VALUE 10 MΩ

 

CCEM-K2

The key comparison reference value, xR, and the expanded uncertainty (k = 2) of the key comparison reference value, UR, is computed from the weighted mean of the DiCOMB 's, where the UiCOMB ’s for each NMI are used as weights (See section 5.2 of the CCEM-K2 Final report).

        xR = 0.346 × 10-6     UR = 0.859 × 10-6

 

The degree of equivalence of each laboratory with respect to the key comparison reference value is given by a pair of terms expressed in 10-6:

Di = DiCOMB - xR and its expanded uncertainty (k = 2), where Ui = (UiCOMB- UR2)1/2 .

 

Linking EUROMET.EM-K2 to CCEM-K2

METAS, PTB, VSL, NPL, LNE and VNIIM provide the link between the key comparison CCEM-K2 and EUROMET.EM-K2, having participated in both comparisons. The linking process is described in Section 6.6 of the EUROMET.EM-K2 Final Report.

 

Linking EURAMET.EM-K2.1 to CCEM-K2

METAS provides the link between the key comparison CCEM-K2 and EURAMET.EM-K2.1, having participated in both comparisons and also participated in EUROMET.EM-K2. The linking process is described in Section 6.4 of the EURAMET.EM-K2.1 Final Report.

 

Linking APMP.EM-K2 to CCEM-K2

KRISS, MSL, NIM, VNIIM provide the link between the key comparison CCEM-K2 and APMP.EM-K2, having participated in both comparisons. The linking process is described in Section 7 of the APMP.EM-K2 Final Report.

CCEM-K2, SIM.EM-K2, EUROMET.EM-K2, EURAMET.EM-K2.1 and APMP.EM-K2

MEASURAND   Resistance

NOMINAL VALUE 1 GΩ

 

CCEM-K2

The key comparison reference value, xR, and the expanded uncertainty (k = 2) of the key comparison reference value, UR, is computed from the weighted mean of the DiCOMB 's, where the UiCOMB ’s for each NMI are used as weights (See section 5.2 of the CCEM-K2 Final report).

        xR = 0.10 × 10-6     UR = 3.19 × 10-6

 

The degree of equivalence of each laboratory with respect to the key comparison reference value is given by a pair of terms expressed in 10-6:

Di = DiCOMB - xR and its expanded uncertainty (k = 2), Ui = (UiCOMB- UR2)1/2 .

 

Linking SIM.EM-K2 to CCEM-K2

NIST and NRC provide the link between the key comparison CCEM-K2 and SIM.EM-K2, having participated in both comparisons. The linking process is described in Appendix G of the SIM.EM-K2 Final Report

 

Linking EUROMET.EM-K2 to CCEM-K2

METAS, PTB, VSL, NPL, LNE and VNIIM provide the link between the key comparison CCEM-K2 and EUROMET.EM-K2, having participated in both comparisons. The linking process is described in Section 6.6 of the EUROMET.EM-K2 Final Report

 

Linking EURAMET.EM-K2.1 to CCEM-K2

METAS provides the link between the key comparison CCEM-K2 and EURAMET.EM-K2.1, having participated in both comparisons and also participated in EUROMET.EM-K2. The linking process is described in Section 6.4 of the EURAMET.EM-K2.1 Final Report.

 

Linking APMP.EM-K2 to CCEM-K2

KRISS, MSL, NIM, VNIIM provide the link between the key comparison CCEM-K2 and APMP.EM-K2, having participated in both comparisons. The linking process is described in Section 7 of the APMP.EM-K2 Final Report.

Comparison
Comparison close
Results

CCEM-K2, EUROMET.EM-K2, EURAMET.EM-K2.1 and APMP.EM-K2

MEASURAND   Resistance

NOMINAL VALUE 10 MΩ

 

CCEM-K2

xi   result of measurement carried out by laboratory iLabi expressed as the relative deviation from the nominal value R0 = 10 megaohms,

namely Ri = R0(1 + xi) where Ri is the resistance measured by laboratory i.

Ui   expanded uncertainty (k = 2) of xi

S/N  serial number of the travelling standard

DiCOMB combined mean of the three travelling standards relative differences from a least-squares linear regression of the NIST values for each travelling standard

UiCOMB expanded uncertainty (k = 2) of DiCOMB

The calculation of the DiCOMB's and UiCOMB's is described in detail in Section 5 of the CCEM-K2 Final Report.

Lab i S/N Ui Mean date of measurement DiCOMB UiCOMB
HR7550 HR7551 HR7552
xi xi xi
  / 10-6 / 10-6 / 10-6 / 10-6   / 10-6 / 10-6
NIST 28.2 4.6 18.6 3.0 1996-08-24 -1.6 3.0
NRC* 31 5 20 6.0 1996-10-20 -0.8 5.8
NIST 30.8 6.7 20.2 3.0 1996-12-08 0.1 3.0
LNE 31.49 6.97 23.04 1.4 1997-03-04 0.3 2.3
NPL 30.8 7.1 23.8 1.7 1997-05-06 0.1 2.5
PTB 31.6 7.5 24.8 5.0 1997-07-01 0.4 5.0
NIST 32.7 8.1 28.4 3.0 1997-08-13 1.1 3.0
NMIA 32.3 7.3 27.0 5.0 1997-10-25 0.1 5.5
MSL 32.5 7.3 28.6 1.2 1998-01-11 -0.1 2.3
NMISA* 50 -20 30 104 1998-02-18 -15.4 79
NIST 36.3 8.9 34.5 3.0 1998-04-30 1.9 3.0
RISE 34.3 8.7 32.8 3.6 1998-06-27 0.9 4.1
METAS* 34.7 8.9 33.2 1.4 1998-08-14 1.0 2.3
INRIM* 35.0 9.4 33.7 5.4 1998-09-28 1.3 5.5
VSL 35.4 9.1 35.0 6.0 1998-12-25 0.9 6.5
NIST 34.9 7.8 31.7 3.0 1999-02-22 -0.6 3.0
KRISS 32.7 7.1 30.8 6.0 1999-05-23 -2.0 6.3
NIST 35.5 8.5 33.3 3.0 1999-08-07 -0.5 3.0
NIM** 36.9 10.2 38.1 2.0 1999-11-14 0.9 2.7
VNIIM*** 36 10 37 1.7 2000-01-10 0.3 3.0
NIST 34.7 10.0 35.5 3.0 2000-03-12 -0.4 3.0
NIST(Mean)         1998-05-07 0.0 3.0

* Measurements at 10 V

** Measurements at 91 V

*** Measurements at 50 V

All other measurements at 100 V 

 

EUROMET.EM-K2

Individual measurements and uncertainties reported by laboratories participant in EUROMET.EM-K2 are given in the Annexes of the EUROMET.EM-K2 Final Report.
LNE (France) did not measure at nominal value 10 megaohms.
Measurements were carried out between August 2005 and April 2007.

 

EURAMET.EM-K2.1

Individual measurements and uncertainties reported by laboratories participant in EURAMET.EM-K2.1 are given in the Annexes of the EURAMET.EM-K2.1 Final Report.
Measurements were carried out between March 2010 and February 2011.

 

APMP.EM-K2

Individual measurements and uncertainties reported by laboratories participant in APMP.EM-K2 are given in Section 6 of the APMP.EM-K2 Final Report.
Measurements were carried out between July 2010 and July 2014.

CCEM-K2, SIM.EM-K2, EUROMET.EM-K2, EURAMET.EM-K2.1 and APMP.EM-K2

MEASURAND   Resistance

NOMINAL VALUE 1 GΩ

 

 

CCEM-K2

xi   result of measurement carried out by laboratory iLabi expressed as the relative deviation from the nominal value R0 = 1 gigaohms,

namely Ri = R0(1 + xi) where Ri is the resistance measured by laboratory i.

Ui   expanded uncertainty (k = 2) of xi

S/N  serial number of the travelling standard

DiCOMB combined mean of the three travelling standards relative differences from a least-squares linear regression of the NIST values for each travelling standard

UiCOMB expanded uncertainty (k = 2) of DiCOMB

The calculation of the DiCOMB's and UiCOMB's is described in detail in Section 5 of the CCEM-K2 Final Report.

Lab i S/N Ui Mean date of measurement DiCOMB UiCOMB
HR7550 HR7551 HR7552
xi xi xi
  / 10-6 / 10-6 / 10-6 / 10-6   / 10-6 / 10-6
NIST 8.7 -109.4 734.4 10.0 1996-08-24 -6.7 9.3
NRC 15 -102 743 20.0 1996-10-11 -0.1 20.0
NIST 20.3 -102.0 744.8 10.0 1996-12-08 0.9 9.3
LNE 17.00 -101.00 745.00 18.0 1997-02-18 -1.2 18.3
NPL 10.0 -97.0 737.0 10.0 1997-05-08 -7.1 11.4
PTB 27.0 -89.0 748.0 15.0 1997-07-12 3.4 13.4
NIST 27.6 -88.8 752.3 10.0 1997-08-12 4.8 9.3
NMIA 25.0 -89.0 752.0 70.0 1997-10-25 2.2 66.9
MSL 30.0 -84.0 755.0 5.3 1998-01-11 4.7 7.3
NMISA -40 -130 700 600 1998-02-15 -52.7 581
NIST 31.9 -81.0 758.2 10.0 1998-04-29 5.1 9.3
RISE 25.5 -86.9 754.0 8.8 1998-06-27 -1.5 10.5
METAS 32.4 -81.0 758.2 23.0 1998-08-15 3.0 23.0
INRIM 31.2 -79.9 760.4 19.5 1998-10-17 2.6 19.5
VSL 1.0 -111.0 724.0 40.0 1999-01-03 -32.2 36.4
NIST 31.0 -77.4 759.9 10.0 1999-02-22 0.2 9.3
KRISS 32.0 -76.0 759.0 11.8 1999-05-23 -1.4 12.8
NIST 31.4 -77.5 762.4 10.0 1999-08-07 -2.2 9.3
NIM* 35.0 -74.5 766.9 6.6 1999-11-14 -0.5 8.9
VNIIM** 38 -72 768 4.5 2000-01-23 0.1 8.0
NIST 38.1 -72.3 765.6 10.0 2000-03-13 -2.1 9.3
NIST(Mean)         1998-05-07 0.0 9.3

 

* Measurements at 91 V

** Measurements at 50 V

All other measurements at 100 V 

 

SIM.EM-K2

Individual measurements reported by laboratories participant in SIM.EM-K2 are given in Tables 6.5 and 6.6 for both of the transfer instruments: see on pages 17 and 18 of the SIM.EM-K2 Final Report. These are relative difference between the result of measurement of laboratory i and the nominal value 1 GΩ.
Measurements were carried out between January 2006 and August 2007.

 

EUROMET.EM-K2

Individual measurements and uncertainties reported by laboratories participant in EUROMET.EM-K2 are given in the annexes of the EUROMET.EM-K2 Final Report.
LNMC (Latvia) did not measure at nominal value 1 GΩ.
Measurements were carried out between August 2005 and April 2007.

 

EURAMET.EM-K2.1

Individual measurements and uncertainties reported by laboratories participant in EURAMET.EM-K2.1 are given in the annexes of the EURAMET.EM-K2.1 Final Report.
Measurements were carried out between March 2010 and February 2011.

 

APMP.EM-K2

Individual measurements and uncertainties reported by laboratories participant in APMP.EM-K2 are given in Section 6 of the APMP.EM-K2 Final Report.
Measurements were carried out between July 2010 and July 2014.