CCM.M-K6, APMP.M.M-K6.1 and SIM.M.M-K6
MEASURAND : Mass
NOMINAL VALUE : 50 kg
Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mg.
Enlarged graph
CCM.M-K6, APMP.M.M-K6.1 and SIM.M.M-K6
MEASURAND : Mass
NOMINAL VALUE : 50 kg
Degrees of equivalence represented by Di and its expanded uncertainty Ui at a 95 % level of confidence, both expressed in mg.
| LABi | Di | Uneg,i | Upos,i | |
|---|---|---|---|---|
mg |
mg |
mg |
||
| CENAM | 0.90 | 2.28 | ||
| PTB | 3.17 | 2.60 | ||
| KRISS | -3.06 | 8.78 | ||
| NPL | 0.17 | 2.00 | ||
| NRC | 1.27 | 3.38 | ||
| NIST | 0.84 | 3.36 | ||
| INMETRO | -2.06 | 6.12 | ||
| INRIM | -4.89 | 3.46 | ||
| CEM | -2.34 | 5.14 | ||
| NIM | -0.91 | 5.27 | ||
| RECOPE | 5.93 | 30.1 | ||
| INTI | -13.07 | 24.2 | ||
| LATU | 12.93 | 70.1 | ||
| INEN | 153.98 | 24.0 | ||
| INM (CO) | -5.17 | 15.1 |
| Metrology area, Sub-field | Mass and related quantities, Mass Standards |
| Description | Comparison of mass standards |
| Time of measurements | 2015 - 2017 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| References | |
| Measurand | Mass: 50 kg |
| Transfer device | A cylindrical shaped mass with nominal value 50 kg made in stainless steel |
| Comparison type | Key Comparison |
| Consultative Committee | CCM (Consultative Committee for Mass and Related Quantities) |
| Conducted by | SIM (Inter-American Metrology System) |
| Comments | Results published 19 November 2025 |
| Pilot institute |
CENAM
Centro Nacional de Metrologia Mexico |
| Contact person | L. M. Pena 52 442 2 11 05 00 to 02 |
| Pilot laboratory | |
|---|---|
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| INEN |
Servicio Ecuatoriano de Normalización, Ecuador, SIM |
| INM (CO) |
Instituto Nacional de Metrología de Colombia, Colombia, SIM |
| INTI |
Instituto Nacional de Tecnologia Industrial, Argentina, SIM |
| LACOMET |
Laboratorio Costarricense de Metrologia, Costa Rica, SIM |
| LATU |
Laboratorio Tecnologico del Uruguay, Uruguay, SIM |
| NRC |
National Research Council, Canada, SIM |
| RECOPE |
Laboratorio Nacional de Metrología, Grandes Masas y Volúmenes (RECOPE), Costa Rica, SIM |
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CCM.M-K6, APMP.M.M-K6.1 and SIM.M.M-K6
MEASURAND : Mass
NOMINAL VALUE : 50 kg
The median of the mass differences between the results reported by the participants and the results reported by the Pilot Laboratory (CENAM) was calculated as the reference value, xR, with combined standard uncertainty uR (see Section 7.1 of the CCM.M-K6 Final Report).
xR = -0.90 mg uR = 1.20 mg
The degree of equivalence of laboratory i relative to the key comparison reference value xR is given by a pair of terms, both expressed in mg:
Di and its expanded uncertainty Ui at a 95 % level of confidence are evaluated according to Section 7 of the CCM.M-K6 Final report.
Linking APMP.M.M-K6.1 to CCM.M-K6
KRISS and CENAM provide the link between the key comparison CCM.M-K6 and APMP.M.M-K6.1, having participated in both comparisons. The linking process is described in Section 8 of the APMP.M.M-K6.1 Final Report.
Linking SIM.M.M-K6 to CCM.M-K6
CENAM and NRC provide the link between the key comparison CCM.M-K6 and SIM.M.M-K6, having participated in both comparisons. The linking process is described in Section 7 of the SIM.M.M-K6 Final Report.
CCM.M-K6, APMP.M.M-K6.1 and SIM.M.M-K6
MEASURAND : Mass
NOMINAL VALUE : 50 kg
CCM.M-K6
The key comparison was organized in two “petals” and used two 50 kg stainless steel standards.
All participants measured at least one of the travelling standards between April 2011 and July 2013.
CENAM acted as the Pilot Laboratory.
xi : reported result obtained as the difference between the measurement of the mass standard carried out by laboratory i and its nominal value
ui : combined standard uncertainty of xi
The analysis of the results is explained in Section 7 of the Final Report.
APMP.M.M-K6.1
The results reported by the participants are given in Table 5 on page 4 of the APMP.M.M-K6.1 Final report, and were obtained as the difference between the measurement of the mass standard carried out by laboratories and the nominal value 50 kg. The measurements were carried out in 2017.
SIM.M.M-K6
The results reported by the participants are given in Table 6 on page 7 of the SIM.M.M-K6 Final Report, and were obtained as the difference between the measurement of the mass standard carried out by laboratories and the nominal value 50 kg. The measurements were carried out in 2015-2017.
