CCM.MK1, APMP.M.MK1, EUROMET.M.MK1, EUROMET.M.MK4, EUROMET.M.MK4.1, APMP.M.MK6, COOMET.M.MK1,
APMP.M.MK1.1 and EURAMET.M.MK4.2
MEASURAND : Mass
NOMINAL VALUE : 1 kg
Degrees of equivalence D_{i} and expanded uncertainty U_{i} expressed in µg:
click here to access the graph of equivalence
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 500 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg: Click here to view the Graph of equivalence
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 20 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg: Click here to view the Graph of equivalence
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 2 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg: Click here to view the Graph of equivalence
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 100 mg
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg: Click here to view the Graph of equivalence
CCM.MK1, APMP.M.MK1, EUROMET.M.MK1, EUROMET.M.MK4, EUROMET.M.MK4.1, APMP.M.MK6, COOMET.M.MK1,
APMP.M.MK1.1 and EURAMET.M.MK4.2
MEASURAND : Mass
NOMINAL VALUE : 1 kg
Degrees of equivalence D_{i} and expanded uncertainty U_{i} expressed in µg
In dark blue: laboratories participant in CCM.MK1,
In blue: laboratories participant in APMP.M.MK1,
In green: laboratories participant in EUROMET.M.MK1,
In purple: laboratories participant in EUROMET.M.MK4,
In orange: laboratories participant in EUROMET.M.MK4.1,
In red: laboratories participant in APMP.M.MK6,
In black: laboratories participant in COOMET.M.MK1,
In grey: laboratories participant in APMP.M.MK1.1,
In pink: laboratories participant in EURAMET.M.MK4.2
No pairwise degrees of equivalence are reported here. They may be found in the relevant Final Reports.
Results are presented under A4 printable format in Summary Results (PDF file).
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 500 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg
In dark blue: laboratories participant in CCM.MK2
In blue: laboratories participant in APMP.M.MK6
In green: laboratories participant in EUROMET.M.MK2
In orange: laboratories participant in EUROMET.M.MK2.1
In pink: laboratories participant in APMP.M.MK2
In braun: laboratory participant in APMP.M.MK2.1
In grey: laboratories participant in EURAMET.M.MK2.2
In purple: laboratory participant in EURAMET.M.MK2.3
In black: laboratory participant in EURAMET.M.MK2.6
Results are presented under A4 printable format in Summary Results (PDF file).
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 20 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg
In dark blue: laboratories participant in CCM.MK2
In blue: laboratories participant in APMP.M.MK6
In green: laboratories participant in EUROMET.M.MK2
In orange: laboratories participant in EUROMET.M.MK2.1
In pink: laboratories participant in APMP.M.MK2
In braun: laboratory participant in APMP.M.MK2.1
In grey: laboratories participant in EURAMET.M.MK2.2
In purple: laboratory participant in EURAMET.M.MK2.3
In black: laboratory participant in EURAMET.M.MK2.6
Results are presented under A4 printable format in Summary Results (PDF file).
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 2 g
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg
In dark blue: laboratories participant in CCM.MK2
In blue: laboratories participant in APMP.M.MK6
In green: laboratories participant in EUROMET.M.MK2
In orange: laboratories participant in EUROMET.M.MK2.1
In pink: laboratories participant in APMP.M.MK2
In braun: laboratory participant in APMP.M.MK2.1
In grey: laboratories participant in EURAMET.M.MK2.2
In black: participant in EURAMET.M.MK2.6
Results are presented under A4 printable format in Summary Results (PDF file).
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 100 mg
Degrees of equivalence: D_{i} and expanded uncertainty U_{i} (at a 95 % level of confidence) expressed in mg
In dark blue: laboratories participant in CCM.MK2
In blue: laboratories participant in APMP.M.MK6
In green: laboratories participant in EUROMET.M.MK2
In orange: laboratories participant in EUROMET.M.MK2.1
In pink: laboratories participant in APMP.M.MK2
In braun: laboratory participant in APMP.M.MK2.1
In grey: laboratories participant in EURAMET.M.MK2.2
In black: participant in EURAMET.M.MK2.6
Results are presented under A4 printable format in Summary Results (PDF file).
Metrology area, Subfield  Mass and related quantities, Mass Standards 
Description  Comparison of mass standards 
Time of measurements  2005  2006 
Status  Approved for equivalence 
Final Reports of the comparisons  
Measurand  Mass: 100 mg, 2 g, 20 g, 500 g and 1 kg 
Transfer device  Two sets of weights of class E2 
Comparison type  Key Comparison 
Consultative Committee  CCM (Consultative Committee for Mass and Related Quantities) 
Conducted by  APMP (Asia Pacific Metrology Programme) 
Comments  APMP.M.MK6 results published on 24 October 2008 Comparison of (sub)multiples of the kilogram APMP.M.MK6 results are linked to those of CCM.MK1 for nominal value 1 kg, and to those of CCM.MK2 for nominal values 500 g, 20 g, 2 g, and 100 mg. 
Pilot institute 
VMISTAMEQ
Viet Nam Metrology Institute, Directorate for Standards and Quality Viet Nam 
Contact person  Le Hong Phong +84 4 8361872 or +84 4 8361137 
Pilot laboratory  

VMISTAMEQ 
Viet Nam Metrology Institute, Directorate for Standards and Quality, Viet Nam, APMP 
MASM 
Mongolian Agency for Standardization and Metrology, Mongolia, APMP 
MUSSD 
Department of Measurement Units, Standards and Services, Sri Lanka, APMP 
NIMT 
National Institute of Metrology (Thailand), Thailand, APMP 
NIS 
National Institute for Standards, Egypt, AFRIMETS 
NMIA 
National Measurement Institute, Australia, Australia, APMP 
NPLI 
CSIR National Physical Laboratory of India, India, APMP 
NSCL 
National Standards and Calibration Laboratory, Syrian Arab Republic, APMP 
STDITDI 
Standards and Testing Division, Industrial Technology Development Institute, Philippines, APMP 
This page proposes printout on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
CCM.MK1, APMP.M.MK1, EUROMET.M.MK1, EUROMET.M.MK4, EUROMET.M.MK4.1, APMP.M.MK6, COOMET.M.MK1,
APMP.M.MK1.1 and EURAMET.M.MK4.2
MEASURAND : Mass
NOMINAL VALUE : 1 kg
The key comparison reference value, x_{R}, is evaluated as the median of the x_{i} values (the BIPM zero value being counted only once), and its standard uncertainty, u_{R}, as the standard deviation of median (see Appendix 2 of CCM.MK1 Final Report). x_{R} = 3.0 µg and u_{R} = 2.2 µg 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in µg. Detailed information on the evaluation of U_{i} may be found in Appendix 3 of CCM.MK1 Final Report. 
The degree of equivalence between two laboratories participant in CCM.MK1 is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (x_{i}  x_{j}) and U_{ij}, its expanded uncertainty (at a 95% level of confidence), both expressed in µg. Detailed information on the evaluation of U_{ij} may be found in Appendix 3 of CCM.MK1 Final Report. 
The APMP.M.MK1 results were analyzed and linked to the CCM.MK1 results using Generalised LeastSquares (sometimes known as GaussMarkov) estimation (see section 7 of APMP.M.MK1 Final Report). 
1) the degree of equivalence of each laboratory i participant in APMP.M.MK1 relative to the CCM.MK1 key comparison reference value, D_{i} and U_{i}, with U_{i} the expanded uncertainty (k = 2) of D_{i}, and 
2) the degree of equivalence between pairs of laboratories i and j both participant in APMP.M.MK1, D_{ij} and U_{ij}, with U_{ij} the expanded uncertainty (k = 2) of D_{ij}. The degree of equivalence between two laboratories i and j, one participant in CCM.MK1 and the other one in APMP.M.MK1, is given by a pair of terms: D_{ij} = D_{i}  D_{j} and U_{ij}, its expanded uncertainty (k = 2). 
The EUROMET.M.MK1 results were analyzed and linked to the CCM.MK1 results as explained in the Linkage Report, using the values obtained by the three linking laboratories (PTB, INRIM, and NPL). 
It leads to the estimation of the degree of equivalence of each laboratory i participant in EUROMET.M.MK1 relative to the CCM.MK1 key comparison reference value, D_{i} and U_{i}, with U_{i} the expanded uncertainty (k = 2) of D_{i}. 
The pairwise degrees of equivalence inside EUROMET.M.MK1 are given on pages 12, 16, and 19 of the EUROMET.M.MK1 Final Report for mass standards PTBC, INM11, and the mean of both, respectively. 
The EUROMET.M.MK4 and EUROMET.M.MK4.1 results were analyzed and linked to the CCM.MK1 results as explained in Appendix A of the EUROMET.M.MK4 Final Report. The linking laboratories between EUROMET.M.MK4 and CCM.MK1 are PTB, INRIM, and NPL. The linking laboratory between EUROMET.M.MK4.1 and EUROMET.M.MK4 is DFM. 
It leads to the estimation of the degree of equivalence of each laboratory i participant in EUROMET.M.MK4 and K4.1 relative to the CCM.MK1 key comparison reference value, D_{i} and U_{i}, with U_{i} the expanded uncertainty (k = 2) of D_{i}. 
The pairwise degrees of equivalence inside EUROMET.M.MK4 are given on pages 10 to 13 of the EUROMET.M.MK4 Final Report, and the pairwise degree of equivalence between DFM and MIRS, as obtained in EUROMET.M.MK4.1, on page 7 of the EUROMET.M.MK4.1 Final Report. 
The APMP.M.MK6 results obtained for 1 kg were analyzed and linked to the CCM.MK1 results using Generalised LeastSquares (sometimes known as GaussMarkov) estimation (see Section 7 of the APMP.M.MK6 Final Report). 
 the degree of equivalence of each laboratory participant in APMP.M.MK6 with respect to the CCM.MK1 key comparison reference value, D_{i} and U_{i}, and 
 the degrees of equivalence between two laboratories both participant in APMP.M.MK6, D_{ij} and U_{ij}, U_{i} and U_{ij} being the expanded uncertainties (k = 2) of D_{i} and D_{ij} respectively. The pairwise degrees of equivalence inside APMP.M.MK6 for 1 kg are given on page 14 of the APMP.M.MK6 Final Report. 
Artefacts of nominal values 500 g, 20 g, 2 g, and 100 mg are also measured in the framework of key comparison APMP.M.MK6. This is reported together with CCM.MK2 results.
The link is made using PTB values in both comparisons (see on page 6 of the COOMET.M.MK1 Final Report). 
The pairwise degrees of equivalence inside COOMET.M.MK1 are given on page 8 of the COOMET.M.MK1 Final Report. 
The link is made using NMIA results in both comparisons (see Section 8 of the APMP.M.MK1.1 Final Report). 
The pairwise degree of equivalence between NMIA and A*STAR is given on page 8 of the APMP.M.MK1.1 Final Report. 
The link is made through the EUROMET.M.MK4 key comparison using BEV and EIM results in both comparisons (see Section 5 of the EURAMET.M.MK4.2 Final Report)
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 500 g
The key comparison reference value, x_{R}, is evaluated as the median of the x_{i} values. Its standard uncertainty is denoted u_{R}, see Appendix 1 of the CCM.MK2 Final Report. x_{R} = 0.005 mg and u_{R} = 0.004 mg 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{i} may be found in Section 5 of the CCM.MK2 Final Report. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (x_{i}  x_{j}) and U_{ij}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{ij} may be found in Section 6 of the CCM.MK2 Final Report. 
The APMP.M.MK6 results were analyzed and linked to the CCM.MK2 results using Generalised LeastSquares (sometimes known as GaussMarkov) estimation (see Section 7 of the APMP.M.MK6 Final Report). 
 the degree of equivalence of each laboratory participant in APMP.M.MK6 with respect to the CCM.MK2 key comparison reference value, D_{i} and U_{i}, and 
 the degrees of equivalence between two laboratories both participant in APMP.M.MK6, D_{ij} and U_{ij}, U_{i} and U_{ij} being the expanded uncertainties (k = 2) of D_{i} and D_{ij} respectively. The pairwise degrees of equivalence inside APMP.M.MK6 are given on pages 15 and 16 of the APMP.M.MK6 Final Report. 
Artefacts of nominal value 1 kg are also measured in the framework of key comparison APMP.M.MK6. This is reported together with CCM.MK1 results.
The linking process is explained in Appendix A of the EUROMET.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2 are given in Table 6 to 10 of the EUROMET.M.MK2 Final Report. 
The linking process is explained in Appendix A of the EUROMET.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2.1 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2.1 are given in Table 7 to 11 of the EUROMET.M.MK2.1 Final Report. 
The linking process is explained in section 7.3 of the APMP.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 7.3 of the APMP.M.MK2 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The linking process is explained in section 6.2 of the APMP.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 6.2 of the APMP.M.MK2.1 Final Report. 
No pairwise degrees of equivalence involving APMP.M.MK2.1 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using BEV and EIM results in both comparisons (see Section 5 of the EURAMET.M.MK2.2 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.2 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using EIM results in both comparisons (see Section 7 of the EURAMET.M.MK2.3 Final Report).
The pairwise degrees of equivalence inside EURAMET.M.MK2.3 are given in Table 5 of the EURAMET.M.MK2.3 Final Report. 
The link is made through the results of NPL having participated in both comparisons (see Section 4 of the EURAMET.M.MK2.6 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.6 participants have been computed. 
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 20 g
The key comparison reference value, x_{R}, is evaluated as the median of the x_{i} values. Its standard uncertainty is denoted u_{R}, see Appendix 1 of the CCM.MK2 Final Report. x_{R} = 0.0027 mg and u_{R} = 0.0011 mg 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{i} may be found in Section 5 of the CCM.MK2 Final Report. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (x_{i}  x_{j}) and U_{ij}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{ij} may be found in Section 6 of the CCM.MK2 Final Report. 
The APMP.M.MK6 results were analyzed and linked to the CCM.MK2 results using Generalised LeastSquares (sometimes known as GaussMarkov) estimation (see Section 7 of the APMP.M.MK6 Final Report). 
 the degree of equivalence of each laboratory participant in APMP.M.MK6 with respect to the CCM.MK2 key comparison reference value, D_{i} and U_{i}, and 
 the degrees of equivalence between two laboratories both participant in APMP.M.MK6, D_{ij} and U_{ij}, U_{i} and U_{ij} being the expanded uncertainties (k = 2) of D_{i} and D_{ij} respectively. The pairwise degrees of equivalence inside APMP.M.MK6 are given on pages 15 and 16 of the APMP.M.MK6 Final Report. 
Artefacts of nominal value 1 kg are also measured in the framework of key comparison APMP.M.MK6. This is reported together with CCM.MK1 results.
The linking process is explained in Appendix A of the EUROMET.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2 are given in Table 6 to 10 of the EUROMET.M.MK2 Final Report. 
The linking process is explained in Appendix A of the EUROMET.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2.1 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2.1 are given in Table 7 to 11 of the EUROMET.M.MK2.1 Final Report. 
The linking process is explained in section 7.3 of the APMP.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 7.3 of the APMP.M.MK2 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The linking process is explained in section 6.2 of the APMP.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 6.2 of the APMP.M.MK2.1 Final Report. 
No pairwise degrees of equivalence involving APMP.M.MK2.1 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using BEV and EIM results in both comparisons (see Section 5 of the EURAMET.M.MK2.2 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.2 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using EIM results in both comparisons (see Section 7 of the EURAMET.M.MK2.3 Final Report).
The pairwise degrees of equivalence inside EURAMET.M.MK2.3 are given in Table 5 of the EURAMET.M.MK2.3 Final Report. 
The link is made through the results of NPL having participated in both comparisons (see Section 4 of the EURAMET.M.MK2.6 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.6 participants have been computed. 
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 2 g
The key comparison reference value, x_{R}, is evaluated as the median of the x_{i} values. Its standard uncertainty is denoted u_{R}, see Appendix 1 of the CCM.MK2 Final Report. x_{R} = 0.0007 mg and u_{R} = 0.0004 mg 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{i} may be found in Section 5 of the CCM.MK2 Final Report. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (x_{i}  x_{j}) and U_{ij}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{ij} may be found in Section 6 of the CCM.MK2 Final Report. 
The APMP.M.MK6 results were analyzed and linked to the CCM.MK2 results using Generalised LeastSquares (sometimes known as GaussMarkov) estimation (see Section 7 of the APMP.M.MK6 Final Report). 
 the degree of equivalence of each laboratory participant in APMP.M.MK6 with respect to the CCM.MK2 key comparison reference value, D_{i} and U_{i}, and 
 the degrees of equivalence between two laboratories both participant in APMP.M.MK6, D_{ij} and U_{ij}, U_{i} and U_{ij} being the expanded uncertainties (k = 2) of D_{i} and D_{ij} respectively. The pairwise degrees of equivalence inside APMP.M.MK6 are given on pages 15 and 16 of the APMP.M.MK6 Final Report. 
Artefacts of nominal value 1 kg are also measured in the framework of key comparison APMP.M.MK6. This is reported together with CCM.MK1 results.
The linking process is explained in Appendix A of the EUROMET.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2 are given in Table 6 to 10 of the EUROMET.M.MK2 Final Report. 
The linking process is explained in Appendix A of the EUROMET.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2.1 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2.1 are given in Table 7 to 11 of the EUROMET.M.MK2.1 Final Report. 
The linking process is explained in section 7.3 of the APMP.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 7.3 of the APMP.M.MK2 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The linking process is explained in section 6.2 of the APMP.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 6.2 of the APMP.M.MK2.1 Final Report. 
No pairwise degrees of equivalence involving APMP.M.MK2.1 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using BEV and EIM results in both comparisons (see Section 5 of the EURAMET.M.MK2.2 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.2 participants have been computed. 
The link is made through the results of NPL having participated in both comparisons (see Section 4 of the EURAMET.M.MK2.6 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.6 participants have been computed. 
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 100 mg
The key comparison reference value, x_{R}, is evaluated as the median of the x_{i} values. Its standard uncertainty is denoted u_{R}, see Appendix 1 of the CCM.MK2 Final Report. x_{R} = 0.0004 mg and u_{R} = 0.0002 mg 
The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms: D_{i} = (x_{i}  x_{R}) and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{i} may be found in Section 5 of the CCM.MK2 Final Report. 
The degree of equivalence between two laboratories is given by a pair of terms: D_{ij} = D_{i}  D_{j} = (x_{i}  x_{j}) and U_{ij}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. Detailed information on the evaluation of U_{ij} may be found in Section 6 of the CCM.MK2 Final Report. 
The APMP.M.MK6 results were analyzed and linked to the CCM.MK2 results using Generalised LeastSquares (sometimes known as GaussMarkov) estimation (see Section 7 of the APMP.M.MK6 Final Report). 
 the degree of equivalence of each laboratory participant in APMP.M.MK6 with respect to the CCM.MK2 key comparison reference value, D_{i} and U_{i}, and 
 the degrees of equivalence between two laboratories both participant in APMP.M.MK6, D_{ij} and U_{ij}, U_{i} and U_{ij} being the expanded uncertainties (k = 2) of D_{i} and D_{ij} respectively. The pairwise degrees of equivalence inside APMP.M.MK6 are given on pages 15 and 16 of the APMP.M.MK6 Final Report. 
Artefacts of nominal value 1 kg are also measured in the framework of key comparison APMP.M.MK6. This is reported together with CCM.MK1 results.
The linking process is explained in Appendix A of the EUROMET.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2 are given in Table 6 to 10 of the EUROMET.M.MK2 Final Report. 
The linking process is explained in Appendix A of the EUROMET.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in EUROMET.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (at a 95% level of confidence), both expressed in mg. These are computed as explained in Appendix A of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between any of the laboratories participating in EUROMET.M.MK2.1 and those participating in CCM.MK2 are not computed. The pairwise degrees of equivalence inside EUROMET.M.MK2.1 are given in Table 7 to 11 of the EUROMET.M.MK2.1 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The linking process is explained in section 7.3 of the APMP.M.MK2 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 7.3 of the APMP.M.MK2 Final Report. 
The degrees of equivalence between two laboratories participating in APMP.M.MK2 is given by a pair of terms both expressed in mg: D_{ij} = D_{i } D_{j}, and its expanded uncertainty (k = 2) U_{ij}. The pairwise degrees of equivalence between any of the laboratories participating in APMP.M.MK2 and those participating in CCM.MK2 are not computed. 
The linking process is explained in section 6.2 of the APMP.M.MK2.1 Final Report.
The degree of equivalence of each laboratory i participant in APMP.M.MK2.1 with respect to the CCM.MK2 key comparison reference value is given by a pair of terms: D_{i} and U_{i}, its expanded uncertainty (k = 2), both expressed in mg. These are computed as explained in section 6.2 of the APMP.M.MK2.1 Final Report. 
No pairwise degrees of equivalence involving APMP.M.MK2.1 participants have been computed. 
The link is made through the EUROMET.M.MK2 key comparison using BEV and EIM results in both comparisons (see Section 5 of the EURAMET.M.MK2.2 Final Report)
No pairwise degrees of equivalence involving EURAMET.M.MK2.2 participants have been computed. 
The link is made through the results of NPL having participated in both comparisons (see Section 4 of the EURAMET.M.MK2.6 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.6 participants have been computed. 
CCM.MK1, APMP.M.MK1, EUROMET.M.MK1, EUROMET.M.MK4, EUROMET.M.MK4.1, APMP.M.MK6, COOMET.M.MK1,
APMP.M.MK1.1 and EURAMET.M.MK4.2
MEASURAND : Mass
NOMINAL VALUE : 1 kg
x_{(rep)i} : reported result obtained as the difference between the measurement of the mass standards carried out by laboratory i (being evaluated as the average mass of two 1 kg artefacts) and the nominal value 1 kg
u_{i }: combined standard uncertainty of x_{(rep)i}
Seven participating laboratories determined the mass of the travelling standards VSL1 and J2 (Package 1) while the remaining seven determined the mass of the travelling standards VSL2 and J3 (Package 2).
As Pilot laboratory, the BIPM determined the mass of the travelling standards of each package at the beginning and at the end of the comparison, and a few times during the course of the comparison.
x_{i} : difference between the mass determined by laboratory i, x_{(rep)i}, and that determined by the Pilot laboratory.
The Pilot's mass value is the average of the two results obtained before and after the measurement at laboratory i, except for PTB and SMU where only the BIPM result of May 96 is used, and NIM where only the BIPM result of Feb 97 is used (see CCM.MK1 Final Report).
Set of mass standards: Package 1
Lab i  x_{(rep)}_{i}/ mg  u_{i}/ mg  x_{i}/ mg  Date of measurement 
BIPM 
1.928 
0.012  0.000  Feb 95 
NMiVSL 
1.905 
0.018  0.018  May 95 
NPL 
1.923 
0.016  0.001  Jul 95 
BIPM 
1.918 
0.012  0.000  Sep 95 
VNIIM 
1.963 
0.024  0.046  Feb 96 
BIPM 
1.915 
0.012  0.000  May 96 
PTB 
1.911 
0.012  0.004  Aug 96 
SMU 
1.972 
0.022  0.057  Dec 96 
BIPM 
1.917 
0.012  0.000  Feb 97 
KRISS 
1.913 
0.014  0.004 
Mar 97 
BIPM 
1.918 
0.012 
0.000 
Apr 97 
LNEINM 
1.919 
0.011 
0.003 
Jul 97 
BIPM 
1.914 
0.012
0.000
Sep 97
Set of mass standards: Package 2
Lab i  x_{(rep)}_{i}/ mg  u_{i} / mg 
x_{i}_{}/ mg 
Date of measurement 
BIPM 
1.803 
0.012  0.000  Feb 95 
NIST 
1.775 
0.019  0.021  Jul 95 
NRC 
1.776 
0.016  0.020  Sep 95 
NMIJ 
1.773 
0.013  0.023  Feb 96 
BIPM 
1.789 
0.012  0.000  May 96 
NMIA 
1.791 
0.014  0.002  Jul 96 
BIPM 
1.790 
0.012  0.000  Sep 96 
NIM 
1.830 
0.021  0.004  Oct 96 
BIPM 
1.835 
0.012  0.000  Feb 97 
BIPM 
1.803 
0.012  0.000  Feb 97 
INRIM 
1.798 
0.013  0.003 
May 97 
BIPM 
1.799 
0.012 
0.000 
Jun 97 
CENAM 
1.794 
0.013 
0.001 
Sep 97 
BIPM 
1.791 
0.012
0.000
Oct 97
x_{APMP i} : reported result, obtained as the difference between the measurement of the mass standards carried out by laboratory i and the nominal value 1 kg
U_{APMP i} : expanded uncertainty (k = 2) of x_{APMP i}
All laboratories determined the mass of two travelling standards, Mass standard m: and Mass standard m::.
As APMP.M.MK1 Pilot laboratory, NIMT determined the mass of the travelling standards five time during the course of the comparison.
Lab i  x_{APMP}_{ i}/ mg  U_{APMP i} / mg 
x_{APMP i} 
U_{APMP i} 
Date of measurement  
Mass standard m: 
Mass standard m:: 



NIMT 
0.081 
0.032 
0.127 
0.032 
2021 Jul 99  
CMS/ITRI 
0.099 
0.026 
0.113 
0.026 
1927 Aug 99  
NMIJ 
0.115 
0.076 
0.089 
0.076 
Sep 99  
NIMT 
0.090 
0.032 
0.125 
0.032 
30 Nov1 Dec 99  
NPLI 
0.101 
0.028 
0.097 
0.028 
2831 Dec 99  
MSL 
0.114 
0.041 
0.068 
0.041 
FebMar 00  
NIMT 
0.123 
0.032 
0.088 
0.032 
3031 Mar 00  
NMLSIRIM 
0.120 
0.110 
0.070 
0.110 
24 Apr 00  
ITDI 
0.281 
0.073 
0.118 
0.069 
MayJun 00  
KRISS 
0.095 
0.029 
0.099 
0.029 
23 Jun11 Jul 00  
NIMT 
0.080 
0.032 
0.086 
0.032 
0809 Aug 00  
NMIA 
0.094 
0.030 
0.094 
0.030 
Sep 00  
SCL 
0.087 
0.044
0.093
0.044
Oct 00
SPRING
0.18
0.13
0.03
0.12
Nov 00
VMI0.022
0.042
0.214
0.042
0830 Dec 00
NMISA0.100
0.040
0.095
0.040
08 Jan 01
NIS0.039
0.041
0.154
0.041
2226 Nov 01
NIMT0.092
0.032
0.097
0.032
1819 Jun 01
x_{EUR i} : reported result, obtained as the difference between the measurement of the mass standards carried out by laboratory i and the nominal value 1 kg
u_{EUR i} : standard uncertainty (k = 1) of x_{EUR i}
Lab i  x_{EUR}_{ i}/ µg  u_{EUR i} / µg 
x_{EUR i} 
u_{EUR i} 
Date of measurement  
Mass standard PTBC 
Mass standard INM11 



JV 
577 
23.5 
2428 
21.5 
May 95  
SP 
589 
18.0 
2411 
18.0 
Jun 95  
MIKES 
596 
17.2 
2393 
17.1 
SepOct 95  
DFM 
571 
20.0 
2444 
20.0 
Nov 95  
PTB 
589 
14.8 
2422 
13.2 
AprMay 96  
INRIM 
559 
13.6 
2451 
13.9 
JunAug 96  
NPL 
572 
14.4 
2432 
14.9 
AugSep 96  
SMD 
599 
21.0 
2401 
21.0 
Nov 96  
LNE 
591 
18.0 
2415 
18.0 
DecFeb 97  
CEM 
600 
17.0 
2412 
17.1 
MarApr 97 
x_{EUR4 i} : reported result, obtained as the difference between the measurement of the mass standards carried out by laboratory i and the nominal value 1 kg
u_{EUR4 i} : standard uncertainty (k = 1) of x_{EUR4 i}
Lab i  x_{EUR4}_{ i}/ µg 
x_{EUR4 i} 
u_{EUR4 i} 
Date of measurement  
Mass standard 
m_{61 }m_{61D} 



SMD 
807 
997 
25 
Feb 01  
NMiVSL 
799 
984 
11 
Mar 01  
CEM 
815 
1002 
10 
Apr 01  
GUM 
784 
976 
29 
Jun 01  
CMI 
835 
1018 
70 
Jul 01  
PTB 
786 
980 
13 
Aug 01  
SMU 
798 
985 
15 
Sep 01  
NPL 
802 
993 
12 
Sep 01  
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 500 g
Note: all values are expressed in mg
x_{(rep)i} : reported result obtained as the difference between the measurement of the mass standard carried out by laboratory i and its nominal value
u_{i }: combined standard uncertainty of x_{(rep)i}
Three sets of mass standards, designated as CA, CB and CC, were circulated.
For each set of mass standards the Pilot Laboratory, PTB, carried out two measurements: the first one before the circulation and the second one after the circulation, as indicated respectively by (1) and (2).
x_{i} : difference between the mass determined by laboratory i, x_{(rep)i}, and that determined by the Pilot Laboratory.
The Pilot's mass value is the average of the two results obtained before and after the circulation.
Lab i  x_{(rep)i}  u_{i}  x_{i}_{ }  Date of measurement  
Set of mass standards CA  
PTB (1) 
0.1801 
0.0062  0.0028  Mar 98  
NMIA 
0.1820 
0.0200  0.0047  Jul 98  
KRISS 
0.1719 
0.0073  0.0054  Aug 98  
NMIJ 
0.1490 
0.0080  0.0283  Sep 98  
NIM 
0.1700 
0.0120  0.0073  Nov 98  
PTB (2) 
0.1745 
0.0062  0.0028  Mar 99  
Set of mass standards CB  
PTB (1) 
0.2149 
0.0062  0.0019  Mar 98  
NPL 
0.2090 
0.0074  0.0040  Aug 98  
CENAM 
0.1922 
0.0094  0.0208  Sep 98  
NRC 
0.2062 
0.0078  0.0068  Nov 98  
NIST 
0.2108 
0.0081  0.0022 
Dec 98 

PTB (2) 
0.2111 
0.0062 
0.0019 
Mar 99 

Set of mass standards CC  
PTB (1) 
0.5135 
0.0062 
0.0021 
Mar 98 

VSL 
0.5600 
0.0200 
0.0487 
Jun 98 

SMU 
0.5140 
0.0220 
0.0027 
Aug 98 

METAS 
0.5010 
0.0151 
0.0104 
Sep 98 

LNE 
0.5140 
0.0150 
0.0027 
Oct 98 

INRIM 
0.4990 
0.0076 
0.0124 
Nov 98 

PTB (2) 
0.5092 
0.0062 
0.0021 
Mar 99 
x_{APMP i} : reported result obtained as the difference between the measurement of the mass standards carried out by laboratory i and its nominal value
u_{APMP} _{i }: combined standard uncertainty of x_{APMP i}
As APMP.M.MK6 Pilot Laboratory, VMISTAMEQ determined the mass of the travelling standards four times for Loop A of the comparison, and three times for Loop B of the comparison.
Lab i  x_{APMP i}  u_{APMP i}  Date of measurement  
Loop A  
VMISTAMEQ 
0.213 
0.0207  May 2005  
NMISA 
0.17 
0.125  June 2005  
NMIA 
0.228 
0.024  September 2005  
VMISTAMEQ 
0.201 
0.0374  November 2005  
ITDI 
0.265 
0.043  December 2005  
NIMT 
0.237 
0.038  January 2006  
VMISTAMEQ 
0.209 
0.0374  April 2006  
NIS 
 
  July 2006  
VMISTAMEQ 
0.198 
0.0374  November 2006  
Loop B  
VMISTAMEQ 
0.148 
0.0207 
May 2005 

MUSSD 
0.1216 
0.133 
June 2005 

NPLI 
0.191 
0.041 
October 2005 

VMISTAMEQ 
0.139 
0.0374 
December 2005 

KIMLIPI* 
 
0.031 
March 2006 

VMISTAMEQ 
4.45 
0.0374 
October 2006 
* Measurement results invalidated due to damage of the transfer standards
The results and uncertainties reported by the participants in EUROMET.M.MK2 are given in Table 2 of the EUROMET.M.MK2 Final Report.
The results and uncertainties reported by the participants in EUROMET.M.MK2.1 are given in Table 3 of the EUROMET.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2 are given in Table 1 of the APMP.M.MK2 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2.1 are given in Table 1 of the APMP.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.2 are given in Table 10 of the EURAMET.M.MK2.2 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.3 are given in Table 2 of the EURAMET.M.MK2.3 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.6 are given in Table 6 of the EURAMET.M.MK2.6 Final Report.
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
EURAMET.M.MK2.3, and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 20 g
Note: all values are expressed in mg
x_{(rep)i} : reported result obtained as the difference between the measurement of the mass standard carried out by laboratory i and its nominal value
u_{i }: combined standard uncertainty of x_{(rep)i}
Three sets of mass standards, designated as CA, CB and CC, were circulated.
For each set of mass standards the Pilot Laboratory, PTB, carried out two measurements: the first one before the circulation and the second one after the circulation, as indicated respectively by (1) and (2).
x_{i} : difference between the mass determined by laboratory i, x_{(rep)i}, and that determined by the Pilot Laboratory.
The Pilot's mass value is the average of the two results obtained before and after the circulation.
Lab i  x_{(rep)i}  u_{i}  x_{i}_{ }  Date of measurement  
Set of mass standards CA  
PTB (1) 
0.0052 
0.0023  0.0009  Mar 98  
NMIA 
0.0053 
0.0030  0.0011  Jul 98  
KRISS 
0.0029 
0.0009  0.0014  Aug 98  
NMIJ 
0.0040 
0.0020  0.0003  Sep 98  
NIM 
0.0015 
0.0020  0.0028  Nov 98  
PTB (2) 
0.0033 
0.0023  0.0010  Mar 99  
Set of mass standards CB  
PTB (1) 
0.0035 
0.0023  0.0007  Mar 98  
NPL 
0.0008 
0.0009  0.0034  Aug 98  
CENAM 
0.0016 
0.0021  0.0026  Sep 98  
NRC 
0.0015 
0.0037  0.0027  Nov 98  
NIST 
0.0011 
0.0010  0.0031 
Dec 98 

PTB (2) 
0.0049 
0.0023 
0.0007 
Mar 99 

Set of mass standards CC  
PTB (1) 
0.0024 
0.0023 
0.0000 
Mar 98 

VSL 
0.0020 
0.0040 
0.0044 
Jun 98 

SMU 
0.0119 
0.0035 
0.0095 
Aug 98 

METAS 
0.0064 
0.0026 
0.0088 
Sep 98 

LNE 
0.0037 
0.0026 
0.0061 
Oct 98 

INRIM 
0.0039 
0.0038 
0.0015 
Nov 98 

PTB (2) 
0.0024 
0.0023 
0.0000 
Mar 99 
x_{APMP i} : reported result obtained as the difference between the measurement of the mass standards carried out by laboratory i and its nominal value
u_{APMP} _{i }: combined standard uncertainty of x_{APMP i}
As APMP.M.MK6 Pilot Laboratory, VMISTAMEQ determined the mass of the travelling standards four times for Loop A of the comparison, and three times for Loop B of the comparison.
Lab i  x_{APMP i}  u_{APMP i}  Date of measurement  
Loop A  
VMISTAMEQ 
0.003 
0.0022  May 2005  
NMISA 
0.006 
0.0135  June 2005  
NMIA 
0.0026 
0.0032  September 2005  
VMISTAMEQ 
0.0057 
0.0029  November 2005  
ITDI 
0.013 
0.011  December 2005  
NIMT 
0.002 
0.004  January 2006  
VMISTAMEQ 
0.00074 
0.0030  April 2006  
NIS 
0.018 
0.009  July 2006  
VMISTAMEQ 
0.0064 
0.0030  November 2006  
Loop B  
VMISTAMEQ 
0.0005 
0.0022 
May 2005 

MUSSD 
0.0182 
0.013 
June 2005 

NPLI 
0.0099 
0.0035 
October 2005 

VMISTAMEQ 
0.004 
0.0041 
December 2005 

KIMLIPI 
0.009 
0.0037 
March 2006 

VMISTAMEQ 
0.011 
0.0036 
October 2006 
The results and uncertainties reported by the participants in EUROMET.M.MK2 are given in Table 2 of the EUROMET.M.MK2 Final Report.
The results and uncertainties reported by the participants in EUROMET.M.MK2.1 are given in Table 3 of the EUROMET.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2 are given in Table 1 of the APMP.M.MK2 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2.1 are given in Table 1 of the APMP.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.2 are given in Table 10 of the EURAMET.M.MK2.2 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.3 are given in Table 2 of the EURAMET.M.MK2.3 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.6 are given in Table 6 of the EURAMET.M.MK2.6 Final Report.
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 2 g
Note: all values are expressed in mg
x_{(rep)i} : reported result obtained as the difference between the measurement of the mass standard carried out by laboratory i and its nominal value
u_{i }: combined standard uncertainty of x_{(rep)i}
Three sets of mass standards, designated as CA, CB and CC, were circulated.
For each set of mass standards the Pilot Laboratory, PTB, carried out two measurements: the first one before the circulation and the second one after the circulation, as indicated respectively by (1) and (2).
x_{i} : difference between the mass determined by laboratory i, x_{(rep)i}, and that determined by the Pilot Laboratory.
The Pilot's mass value is the average of the two results obtained before and after the circulation.
Lab i  x_{(rep)i}  u_{i}  x_{i}_{ }  Date of measurement  
Set of mass standards CA  
PTB (1) 
0.0002 
0.0007  0.0008  Mar 98  
NMIA 
0.0014 
0.0006  0.0004  Jul 98  
KRISS 
0.0004 
0.0004  0.0014  Aug 98  
NMIJ 
0.0004 
0.0005  0.0014  Sep 98  
NIM 
0.0008 
0.0006  0.0002  Nov 98  
PTB (2) 
0.0018 
0.0007  0.0008  Mar 99  
Set of mass standards CB  
PTB (1) 
0.0036 
0.0007  0.0003  Mar 98  
NPL 
0.0031 
0.0002  0.0008  Aug 98  
CENAM 
0.0032 
0.0006  0.0007  Sep 98  
NRC 
0.0004 
0.0015  0.0035  Nov 98  
NIST 
0.0025 
0.0004  0.0013 
Dec 98 

PTB (2) 
0.0041 
0.0007 
0.0003 
Mar 99 

Set of mass standards CC  
PTB (1) 
0.0032 
0.0007 
0.0005 
Mar 98 

VSL 
0.0010 
0.0030 
0.0018 
Jun 98 

SMU 
0.0034 
0.0020 
0.0007 
Aug 98 

METAS 
0.0045 
0.0010 
0.0018 
Sep 98 

LNE 
0.0043 
0.0010 
0.0016 
Oct 98 

INRIM 
0.0012 
0.0018 
0.0016 
Nov 98 

PTB (2) 
0.0023 
0.0007 
0.0005 
Mar 99 
x_{APMP i} : reported result obtained as the difference between the measurement of the mass standards carried out by laboratory i and its nominal value
u_{APMP} _{i }: combined standard uncertainty of x_{APMP i}
As APMP.M.MK6 Pilot Laboratory, VMISTAMEQ determined the mass of the travelling standards four times for Loop A of the comparison, and three times for Loop B of the comparison.
Lab i  x_{APMP i}  u_{APMP i}  Date of measurement  
Loop A  
VMISTAMEQ 
0.0125 
0.001  May 2005  
NMISA 
0.014 
0.0065  June 2005  
NMIA 
0.0128 
0.0011  September 2005  
VMISTAMEQ 
0.0115 
0.001  November 2005  
ITDI 
0.006 
0.01  December 2005  
NIMT 
0.0112 
0.0021  January 2006  
VMISTAMEQ 
0.011 
0.001  April 2006  
NIS 
0.008 
0.007  July 2006  
VMISTAMEQ 
0.0096 
0.001  November 2006  
Loop B  
VMISTAMEQ 
0.004 
0.001 
May 2005 

MUSSD 
0.0049 
0.007 
June 2005 

NPLI 
0.0017 
0.0006 
October 2005 

VMISTAMEQ 
0.005 
0.001 
December 2005 

KIMLIPI 
0.0023 
0.0015 
March 2006 

VMISTAMEQ 
0.004 
0.001 
October 2006 
The results and uncertainties reported by the participants in EUROMET.M.MK2 are given in Table 2 of the EUROMET.M.MK2 Final Report.
The results and uncertainties reported by the participants in EUROMET.M.MK2.1 are given in Table 3 of the EUROMET.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2 are given in Table 1 of the APMP.M.MK2 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2.1 are given in Table 1 of the APMP.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.2 are given in Table 10 of the EURAMET.M.MK2.2 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.6 are given in Table 6 of the EURAMET.M.MK2.6 Final Report.
CCM.MK2, APMP.M.MK6, EUROMET.M.MK2, EUROMET.M.MK2.1,
APMP.M.MK2, APMP.M.MK2.1, EURAMET.M.MK2.2,
and EURAMET.M.MK2.6
MEASURAND : Mass
NOMINAL VALUE : 100 mg
Note: all values are expressed in mg
x_{(rep)i} : reported result obtained as the difference between the measurement of the mass standard carried out by laboratory i and its nominal value
u_{i }: combined standard uncertainty of x_{(rep)i}
Three sets of mass standards, designated as CA, CB and CC, were circulated.
For each set of mass standards the Pilot Laboratory, PTB, carried out two measurements: the first one before the circulation and the second one after the circulation, as indicated respectively by (1) and (2).
x_{i} : difference between the mass determined by laboratory i, x_{(rep)i}, and that determined by the Pilot Laboratory.
The Pilot's mass value is the average of the two results obtained before and after the circulation.
Lab i  x_{(rep)i}  u_{i}  x_{i}_{ }  Date of measurement  
Set of mass standards CA  
PTB (1) 
0.0000 
0.0003  0.0002  Mar 98  
NMIA 
0.0005 
0.0003  0.0003  Jul 98  
KRISS 
0.0011 
0.0001  0.0009  Aug 98  
NMIJ 
0.0009 
0.0002  0.0007  Sep 98  
NIM 
0.0007 
0.0003  0.0005  Nov 98  
PTB (2) 
0.0004 
0.0003  0.0002  Mar 99  
Set of mass standards CB  
PTB (1) 
0.0002 
0.0003  0.0001  Mar 98  
NPL 
0.0005 
0.0004  0.0004  Aug 98  
CENAM 
0.0012 
0.0004  0.0011  Sep 98  
NRC 
0.0003 
0.0003  0.0002  Nov 98  
NIST 
0.0008 
0.0001  0.0006 
Dec 98 

PTB (2) 
0.0001 
0.0003 
0.0001 
Mar 99 

Set of mass standards CC  
PTB (1) 
0.0007 
0.0003 
0.0004 
Mar 98 

VSL 
0.0004 
0.0008 
0.0007 
Jun 98 

SMU 
0.0002 
0.0010 
0.0009 
Aug 98 

METAS 
0.0014 
0.0003 
0.0004 
Sep 98 

LNE 
0.0019 
0.0004 
0.0008 
Oct 98 

INRIM 
0.0019 
0.0008 
0.0009 
Nov 98 

PTB (2) 
0.0014 
0.0003 
0.0004 
Mar 99 
x_{APMP i} : reported result obtained as the difference between the measurement of the mass standards carried out by laboratory i and its nominal value
u_{APMP} _{i }: combined standard uncertainty of x_{APMP i}
As APMP.M.MK6 Pilot Laboratory, VMISTAMEQ determined the mass of the travelling standards four times for Loop A of the comparison, and three times for Loop B of the comparison.
Lab i  x_{APMP i}  u_{APMP i}  Date of measurement  
Loop A  
VMISTAMEQ 
0.006 
0.001  May 2005  
NMISA 
0.005 
0.0025  June 2005  
NMIA 
0.0046 
0.00047  September 2005  
VMISTAMEQ 
0.008 
0.001  November 2005  
ITDI 
0.000 
0.009  December 2005  
NIMT 
0.0021 
0.0008  January 2006  
VMISTAMEQ 
0.005 
0.001  April 2006  
NIS 
0.0054 
0.0028  July 2006  
VMISTAMEQ 
0.006 
0.001  November 2006  
Loop B  
VMISTAMEQ 
0.0025 
0.001 
May 2005 

MUSSD 
0.0026 
0.0027 
June 2005 

NPLI 
0.0034 
0.0005 
October 2005 

VMISTAMEQ 
0.0028 
0.001 
December 2005 

KIMLIPI 
0.0049 
0.00066 
March 2006 

VMISTAMEQ 
0.0034 
0.001 
October 2006 
The results and uncertainties reported by the participants in EUROMET.M.MK2 are given in Table 2 of the EUROMET.M.MK2 Final Report.
The results and uncertainties reported by the participants in EUROMET.M.MK2.1 are given in Table 3 of the EUROMET.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2 are given in Table 1 of the APMP.M.MK2 Final Report.
The results and uncertainties reported by the participants in APMP.M.MK2.1 are given in Table 1 of the APMP.M.MK2.1 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.2 are given in Table 10 of the EURAMET.M.MK2.2 Final Report.
The results and uncertainties reported by the participants in EURAMET.M.MK2.6 are given in Table 6 of the EURAMET.M.MK2.6 Final Report.