CCM.MK2, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, EURAMET.M.MK2.3, and EURAMET.M.MK2.5
MEASURAND : Mass
NOMINAL VALUE : 10 kg
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 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 purple: laboratory participant in EURAMET.M.MK2.3
In blue: laboratories participant in EURAMET.M.MK2.5
The pairwise degrees of equivalence shown in the table below are for laboratories participant in CCM.MK2 only.
The pairwise degrees of equivalence inside EUROMET.M.MK2 are given in Table 6 to 10 in the EUROMET.M.MK2 Final Report.
The pairwise degrees of equivalence inside EUROMET.M.MK2.1 are given in Table 7 to 11 in the EUROMET.M.MK2.1 Final Report.
The pairwise degrees of equivalence inside APMP.M.MK2 are given in Table 4 to 8 in the APMP.M.MK2 Final Report.
The pairwise degrees of equivalence inside EURAMET.M.MK2.3 are given in Table 5 in the EUROMET.M.MK2.3 Final Report.
Lab i  D_{i}  U_{i} 
/ mg  / mg  
PTB  0.03  0.34 
NMIA  0.10  0.72 
KRISS  0.19  0.38 
NMIJ  0.17  0.61 
NIM  0.40  1.03 
NPL  0.18  0.39 
CENAM  1.34  1.54 
NRC  1.82  1.96 
NIST  0.07  0.46 
VSL  0.41  2.21 
SMU  1.62  1.74 
METAS  0.03  0.56 
LNE  0.31  0.65 
INRIM  0.27  0.52 
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  2012 
Status  Approved for equivalence 
Final Reports of the comparisons  
Measurand  Mass: 10 kg 
Transfer device  Stainless steel standards 
Comparison type  Key Comparison 
Consultative Committee  CCM (Consultative Committee for Mass and Related Quantities) 
Conducted by  EURAMET (European Association of National Metrology Institutes) 
RMO Internal Identifier  EURAMET Project No 1222 
Comments  This comparison is a followup of comparison EUROMET.M.MK2 CCM.MK2 results published on 25 November 2003 Comparison of multiples and submultiples of the kilogram APMP.M.MK6, APMP.M.MK2.1, EURAMET.M.MK2.2 and EURAMET.M.MK2.3 results are linked to those of CCM.MK2 for nominal values 500 g, 20 g, 2 g, and 100 mg.

Pilot institute 
BEV
Bundesamt für Eich und Vermessungswesen Austria 
Contact person  Z. Zelenka +43 1 211 10 6607 
Pilot laboratory  

BEV 
Bundesamt für Eich und Vermessungswesen, Austria, EURAMET 
BMM 
Bureau of Metrology (Montenegro), Montenegro, EURAMET 
DPM 
Drejtoria e Pergjithshme e Metrologjise/General Directorate of Metrology, Albania, EURAMET 
IMBIH 
Institute of Metrology of Bosnia and Herzegovina, Bosnia and Herzegovina, EURAMET 
MKEH 
Hungarian Trade Licensing Office; now BFKH, Hungary, EURAMET 
PTB 
PhysikalischTechnische Bundesanstalt, Germany, EURAMET 
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CCM.MK2, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, EURAMET.M.MK2.3, and EURAMET.M.MK2.5
MEASURAND : Mass
NOMINAL VALUE : 10 kg
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} = 0.03 mg and u_{R} = 0.12 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 linking process is explained in Appendix A of the EUROMET.M.MK2 Final Report.
he 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 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 the PTB having participated in both comparisons CCM.MK2 and EURAMET.M.MK2.5
(see page 6 of the EURAMET.M.MK2.5 Final Report).
No pairwise degrees of equivalence involving EURAMET.M.MK2.5 participants have been computed. 
CCM.MK2, EUROMET.M.MK2, EUROMET.M.MK2.1, APMP.M.MK2, EURAMET.M.MK2.3, and EURAMET.M.MK2.5
MEASURAND : Mass
NOMINAL VALUE : 10 kg
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) 
2.135 
0.122  0.006  Mar 98  
NMIA 
2.200 
0.340  0.071  Jul 98  
KRISS 
2.296 
0.148  0.167  Aug 98  
NMIJ 
1.930 
0.280  0.199  Sep 98  
NIM 
1.700 
0.500  0.429  Nov 98  
PTB (2) 
2.123 
0.122  0.006  Mar 99  
Set of mass standards CB  
PTB (1) 
3.071 
0.122  0.019  Mar 98  
NPL 
3.200 
0.150  0.149  Aug 98  
CENAM 
1.680 
0.760  1.371  Sep 98  
NRC 
1.200 
0.970  1.851  Nov 98  
NIST 
2.952 
0.197  0.099 
Dec 98 

PTB (2) 
3.032 
0.122 
0.019 
Mar 99 

Set of mass standards CC  
PTB (1) 
8.542 
0.122 
0.023 
Mar 98 

VSL 
8.900 
1.100 
0.381 
Jun 98 

SMU 
6.870 
0.860 
1.649 
Aug 98 

METAS 
8.465 
0.251 
0.054 
Sep 98 

LNE 
8.800 
0.300 
0.281 
Oct 98 

INRIM 
8.760 
0.228 
0.241 
Nov 98 

PTB (2) 
8.496 
0.122 
0.023 
Mar 99 
Note: all values are expressed in mg
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 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.MK2.5 are given in Table 7 of the EURAMET.M.MK2.5 Final Report.