CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL VALUE : 3 Pa

Degrees of equivalence D_i and expanded uncertainty U_i (95% level of confidence) expressed in Pa

Red diamonds : participants in CCM.P-K4
Pink squares : participants in EUROMET.M.P-K1.a
Blue triangles : participants in EURAMET.M.P-K4.2010

Note: Information not apparent on the graph
- D_CSIRO-NML = 0.30 Pa and U_CSIRO-NML = 0.05 Pa,
- U_OMH = 0.23 Pa

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL VALUE : 10 Pa

Degrees of equivalence D_i and expanded uncertainty U_i (95% level of confidence) expressed in Pa

Red diamonds : participants in CCM.P-K4
Pink squares : participants in EUROMET.M.P-K1.a
Blue triangles : participants in EURAMET.M.P-K4.2010

Note: Information not apparent on the graph
- D_CSIRO-NML = 0.57 Pa and U_CSIRO-NML = 0.10 Pa,
- D_OMH = 0.40 Pa and U_OMH = 0.92 Pa

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL VALUE : 30 Pa

Degrees of equivalence D_i and expanded uncertainty U_i (95% level of confidence) expressed in Pa

Red diamonds : participants in CCM.P-K4
Pink squares : participants in EUROMET.M.P-K1.a
Blue triangles : participants in EURAMET.M.P-K4.2010

Note: Information not apparent on the graph
- D_CSIRO-NML = 0.91 Pa and U_CSIRO-NML = 0.15 Pa,
- D_OMH = 2.0 Pa and U_OMH = 3.2 Pa

CCM.P-K2, EURAMET.M.P-K4.2010 and APMP.M.P-K9

MEASURAND                     Effective area of a piston-cylinder assembly

NOMINAL VALUE              335.7 mm²

NOMINAL PRESSURE        10 kPa

CCM.P-K2

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mm².

EURAMET.M.P-K4.2010 and APMP.M.P-K9

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in Pa.

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL VALUE : 3 Pa

In pink: participants in EUROMET.M.P-K1.a.
In blue: participants in EURAMET.M.P-K4.2010.
No pair-wise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.P-K1.a and EURAMET.M.P-K4.2010.

Results are presented under A4 printable format in Summary Results (.PDF file).

Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 80000-1:2009 Annex B Rule B.

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL VALUE : 10 Pa

In pink: participants in EUROMET.M.P-K1.a.
In blue: participants in EURAMET.M.P-K4.2010.
No pair-wise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.P-K1.a and EURAMET.M.P-K4.2010.

Results are presented under A4 printable format in Summary Results (.PDF file).

Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 80000-1:2009 Annex B Rule B.

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL VALUE : 30 Pa

In pink: participants in EUROMET.M.P-K1.a.
In blue: participants in EURAMET.M.P-K4.2010.
No pair-wise degrees of equivalence are deduced from the measurements carried out in the framework of key comparison EUROMET.M.P-K1.a and EURAMET.M.P-K4.2010.

Results are presented under A4 printable format in Summary Results (.PDF file).

Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 80000-1:2009 Annex B Rule B.

CCM.P-K2, EURAMET.M.P-K4.2010 and APMP.M.P-K9

MEASURAND                     Effective area of a piston-cylinder assembly

NOMINAL VALUE              335.7 mm²

NOMINAL PRESSURE        10 kPa

CCM.P-K2

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in mm².

EURAMET.M.P-K4.2010 and APMP.M.P-K9

Degrees of equivalence represented by D_i = (x_I - x_R) and its expanded uncertainty U_i at a 95 % level of confidence, both expressed in Pa.

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL VALUE : 3 Pa

• Key comparison CCM.P-K4

• Linking EUROMET.M.P-K1.a to CCM.P-K4

The results of EUROMET.M.P-K1.a are linked to those of CCM.P-K4 for 7 pressure nominal values in the range 1 Pa to 1000 Pa, through the common participation of three laboratories: CNR-IMGC, PTB, and NPL.
The CNR-IMGC, however, does not participate in the linking process in the pressure range 100 Pa to 1000 Pa, because it did not use a Static Expansion System for that range of measurements in CCM.P-K4.
The detailed calculation used in the linking process is presented on pages 20 and 21 of the EUROMET.M.P-K1.a Final report.

• Linking EURAMET.M.P-K4.2010 to CCM.P-K4

PTB provides the link between key comparisons CCM.P-K4 and EURAMET.M.P-K4.2010 for nominal pressures 3 Pa, 10 Pa, and 30 Pa.
The linkage process is described in Section 11 of the EURAMET.M.P-K4.2010 Final Report.

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL VALUE : 10 Pa

• Key comparison CCM.P-K4

• Linking EUROMET.M.P-K1.a to CCM.P-K4

The results of EUROMET.M.P-K1.a are linked to those of CCM.P-K4 for 7 pressure nominal values in the range 1 Pa to 1000 Pa, through the common participation of three laboratories: CNR-IMGC, PTB, and NPL.
The CNR-IMGC, however, does not participate in the linking process in the pressure range 100 Pa to 1000 Pa, because it did not use a Static Expansion System for that range of measurements in CCM.P-K4.
The detailed calculation used in the linking process in presented on pages 20 and 21 of the EUROMET.M.P-K1.a Final report.

• Linking EURAMET.M.P-K4.2010 to CCM.P-K4

PTB provides the link between key comparisons CCM.P-K4 and EURAMET.M.P-K4.2010 for nominal pressures 3 Pa, 10 Pa, and 30 Pa.
The linkage process is described in Section 11 of the EURAMET.M.P-K4.2010 Final Report.

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL VALUE : 30 Pa

• Key comparison CCM.P-K4

• Linking EUROMET.M.P-K1.a to CCM.P-K4

The results of EUROMET.M.P-K1.a are linked to those of CCM.P-K4 for 7 pressure nominal values in the range 1 Pa to 1000 Pa, through the common participation of three laboratories: CNR-IMGC, PTB, and NPL.
The CNR-IMGC, however, does not participate in the linking process in the pressure range 100 Pa to 1000 Pa, because it did not use a Static Expansion System for that range of measurements in CCM.P-K4.
The detailed calculation used in the linking process in presented on pages 20 and 21 of the EUROMET.M.P-K1.a Final report.

• Linking EURAMET.M.P-K4.2010 to CCM.P-K4

PTB provides the link between key comparisons CCM.P-K4 and EURAMET.M.P-K4.2010 for nominal pressures 3 Pa, 10 Pa, and 30 Pa.
The linkage process is described in Section 11 of the EURAMET.M.P-K4.2010 Final Report.

CCM.P-K2, EURAMET.M.P-K4.2010 and APMP.M.P-K9

MEASURAND                     Effective area of a piston-cylinder assembly

NOMINAL VALUE              335.7 mm²

NOMINAL PRESSURE        10 kPa

CCM.P-K2

The key comparison reference value, x_R, is calculated as the median of the participants' values. The standard uncertainty of the key comparison reference value, u_R, is calculated by the formula u_R = 1.858 MAD / (n - 1)^1/2, where MAD is the median of absolute deviations from the median, and n is the number of participants contributing to the reference value.

                                                x_R = 335.744 4 mm²
                                                u_R = 0.000 9 mm²

The degree of equivalence of laboratory i with respect to the key comparison reference value is given by a pair of terms expressed in mm²:

D_i = (x_i - x_R) and U_i = 2(u_i² + u_R² + u_T²)^1/2, its expanded uncertainty (k = 2). u_T is the uncertainty due to the instability of the transfer standard: u_T = 0.002 5 mm² (see page 15 of the Final Report).

The degree of equivalence between two laboratories i and j is given by a pair of terms expressed in mm²: D_ij = D_i - D_j = (xi - x_j) and U_ij = 2(u_i² + u_j² + 2u_T²)^1/2, its expanded uncertainty (k = 2). Effects of correlation should be taken into consideration.

Linking EURAMET.M.P-K4.2010 to CCM.P-K2

PTB provides the link between key comparisons CCM.P-K2 and EURAMET.M.P-K4.2010, having participated in both comparisons. The linkage process is described in Section 11 of the EURAMET.M.P-K4.2010 Final Report.

The degrees of equivalence of the laboratories having participated in EURAMET.M.P-K4.2010, with respect to the CCM.P-K2 key comparison reference value, are expressed in Pa, and therefore are shown on a different graph from the one for the participants in CCM.P-K2.

Linking APMP.M.P-K9 to CCM.P-K2

NMIA and PTB provides the link between key comparisons CCM.P-K2 and APMP.M.P-K9, having participated in both comparisons. The linkage process is described in Section 6 of the APMP.M.P-K9 Final Report.

The degrees of equivalence of the laboratories having participated in APMP.M.P-K9, with respect to the CCM.P-K2 key comparison reference value, are expressed in Pa, and therefore are shown on a different graph from the one for the participants in CCM.P-K2.

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL PRESSURE : 3 Pa

• Key comparison CCM.P-K4

p_i : corrected mean gauge reading obtained by laboratory i
u_i : combined standard uncertainty of p_i
Further information on p_i and u_i may be found respectively on page 15 and page 22 of CCM.P-K4 Final Report.

• Key comparison EUROMET.M.P-K1.a

The laboratory individual measurements of the participants in EUROMET.M.P-K1.a are given in Table 7 and 8 on pages 17, 18, and 19 of the EUROMET.M.P-K1.a Final Report.
All measurements used a Static Expansion System and were carried out between September 1998 and April 2004.

• Key comparison EURAMET.M.P-K4.2010

The laboratory individual measurements of the participants in the key comparison EURAMET.M.P-K4.2010 are given in Table 10.7a on page 23 of the EURAMET.M.P-K4.2010 Final Report.

Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 80000-1:2009 Annex B Rule B.

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL PRESSURE : 10 Pa

• Key comparison CCM.P-K4

p_i : corrected mean gauge reading obtained by laboratory i
u_i : combined standard uncertainty of p_i
Further information on p_i and u_i may be found respectively on page 15 and page 22 of CCM.P-K4 Final Report.

• Key comparison EUROMET.M.P-K1.a

The laboratory individual measurements of the participants in EUROMET.M.P-K1.a are given in Table 7 and 8 on pages 17, 18, and 19 of the EUROMET.M.P-K1.a Final Report.
All measurements used a Static Expansion System and were carried out between September 1998 and April 2004.

• Key comparison EURAMET.M.P-K4.2010

The laboratory individual measurements of the participants in the key comparison EURAMET.M.P-K4.2010 are given in Table 10.7a on page 23 of the EURAMET.M.P-K4.2010 Final Report.

Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 80000-1:2009 Annex B Rule B.

CCM.P-K4, EUROMET.M.P-K1.a, and EURAMET.M.P-K4.2010

MEASURAND : Pressure
NOMINAL PRESSURE : 30 Pa

• Key comparison CCM.P-K4

p_i : corrected mean gauge reading obtained by laboratory i
u_i : combined standard uncertainty of p_i
Further information on p_i and u_i may be found respectively on page 15 and page 22 of CCM.P-K4 Final Report.

• Key comparison EUROMET.M.P-K1.a

The laboratory individual measurements of the participants in EUROMET.M.P-K1.a are given in Table 7 and 8 on pages 17, 18, and 19 of the EUROMET.M.P-K1.a Final Report.
All measurements used a Static Expansion System and were carried out between September 1998 and April 2004.

• Key comparison EURAMET.M.P-K4.2010

The laboratory individual measurements of the participants in the key comparison EURAMET.M.P-K4.2010 are given in Table 10.7a on page 23 of the EURAMET.M.P-K4.2010 Final Report.

Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO 80000-1:2009 Annex B Rule B.

CCM.P-K2, EURAMET.M.P-K4.2010 and APMP.M.P-K9

MEASURAND                     Effective area of a piston-cylinder assembly

NOMINAL VALUE              335.7 mm²

NOMINAL PRESSURE        10 kPa

x_i   results obtained by laboratory i, Lab_i

u_i   combined standard uncertainty of x_i