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
EURAMET.EM-K2.1
Metrology area, Sub-field Electricity and Magnetism, Resistance
Description Comparison of resistance standards
Time of measurements 2010 - 2011
Status Approved for equivalence
Final Reports of the comparisons
References

EURAMET.EM-K2.1 Technical Protocol

Measurand Resistance: 10 megaohms and 1 gigaohm
Transfer device Transfer resistors
Comparison type Key Comparison
Consultative Committee CCEM (Consultative Committee for Electricity and Magnetism)
Conducted by EURAMET (European Association of National Metrology Institutes)
Comments Results published on 21 February 2013
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 METAS
Federal Institute of Metrology
Switzerland
Contact person B. Jeckelmann

+41 (0) 58 387 0297
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
METAS

Federal Institute of Metrology, Switzerland, EURAMET

BIM

Bulgarian Institute of Metrology, Bulgaria, EURAMET

FER-PEL

FER - Primary Electromagnetic Laboratory, Croatia, EURAMET

GUM

Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET

NIS

National Institute for Standards, Egypt, AFRIMETS

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.