Comparison Display

CCM.P-K6, APMP.M.P-K6, APMP.M.P-K6.1 and EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p ~ 20 kPa

Degrees of equivalence, D_i and expanded uncertainty U_i (k = 2),
expressed in mm²

Red diamonds: participants in CCM.P-K6
Green triangles: participants in APMP.M.P-K6 only
Blue circles: participants in APMP.M.P-K6.1 only

Orange squares: participants in EURAMET.M.P-K8

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CCM.P-K6 and EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL PRESSURE : p = 50 kPa

Degrees of equivalence, D_i and expanded uncertainty U_i (k = 2),
expressed in mm²

Red diamonds: participants in CCM.P-K6

Orange squares: participants in EURAMET.M.P-K8

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CCM.P-K6 and EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p ~70 kPa

Degrees of equivalence, D_i and expanded uncertainty U_i (k = 2),
expressed in mm² for participants in CCM.P-K6

From 1st March 2009, NMi-VSL has been named VSL

Degrees of equivalence, D_i and expanded uncertainty U_i (k = 2),
expressed in mm² for participants in EURAMET.M.P-K8

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CCM.P-K6, APMP.M.P-K6, APMP.M.P-K6.1 and EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p ~ 100 kPa

Degrees of equivalence, D_i and expanded uncertainty U_i (k = 2),
expressed in mm²

Red diamonds: participants in CCM.P-K6
Green triangles: participants in APMP.M.P-K6 only
Blue circles: participants in APMP.M.P-K6.1 only
Orange squares: partcipants in EURAMET.M.P-K8

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CCM.P-K2 and EURAMET.M.P-K8

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 20 kPa

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.

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 50 kPa

CCM.P-K2 and EURAMET.M.P-K8

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.

APMP.M.P-K9

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

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 70 kPa

CCM.P-K2 and EURAMET.M.P-K8

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.

APMP.M.P-K9

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

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 100 kPa

CCM.P-K2 and EURAMET.M.P-K8

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.

APMP.M.P-K9

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

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CCM.P-K6, APMP.M.P-K6, APMP.M.P-K6.1 and EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p ~ 20 kPa

Degrees of equivalence relative to the CCM.P-K6 key comparison reference value, expressed in mm²

* participants in APMP.M.P-K6 only
**participants in APMP.M.P-K6.1 only

Orange : participants in EURAMET.M.P-K8

Matrix of equivalence inside APMP.M.P-K6.1:


Lab i	D_i	U_i
	/ mm²	/ mm²
VSL	0.0010	0.011
METAS	-0.0261	0.050
PTB	0.0000	0.0041
NIST	-0.0011	0.0026
NIM	0.0018	0.0032
NPL	-0.0005	0.0048
NRC	0.0002	0.0027

The matrices of equivalence computed inside key comparisons CCM.P-K6, APMP.M.P-K6 and APMP.M.P-K6.1 are available in Summary Results (.PDF file).

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CCM.P-K6 and EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL PRESSURE : p = 50 kPa


Lab i	D_i	U_i
	/ mm²	/ mm²
VSL	0.0012	0.011
METAS	-0.0167	0.026
PTB	0.0005	0.0032
NIST	-0.0013	0.0026
NIM	0.0000	0.0032
NPL	0.0000	0.0025
NRC	-0.0010	0.0025
METAS*	-0.0020	0.0061
LNE*	-0.0041	0.0055
PTB*	0.0006	0.0033
NSAI NML*	-0.0018	0.0117
MIKES*	-0.0043	0.0069
VSL*	-0.0001	0.0100
NIS*	-0.0049	0.0078
INRIM*	-0.0033	0.0073
UME*	-0.0030	0.0059
EIM*	-0.0038	0.0086
CMI*	-0.0026	0.0061
BEV*	-0.0046	0.0098
MIRS/IMT/LMT*	-0.0027	0.0053
HMI/FSB-LPM*	0.0002	0.0108
IMBIH*	-0.0018	0.0138
CEM*	-0.0056	0.0107
KRISS*	-0.0024	0.0077
INM(RO)*	-0.0038	0.0098
FORCE*	-0.0185	0.0174
IPQ*	0.0021	0.0104
MKEH*	-0.0099	0.0086
MCCAA-SMI*	-0.0022	0.0060

*Participants in EURAMET.M.P-K8

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

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CCM.P-K6 and EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p ~ 70 kPa

Matrix of equivalence inside CCM.P-K6:


Lab i	D_i	U_i
	/ mm²	/ mm²
VSL	0.0010	0.011
METAS	-0.0158	0.018
PTB	0.0010	0.0037
NIST	-0.0014	0.0026
NIM	0.0009	0.0032
NPL	0.0000	0.0022
NRC	-0.0010	0.0024

Degrees of equivalence relative to the CCM.P-K6 key comparison reference value, expressed in mm² for the participants in EURAMET.M.P-K8.

Orange : Participants in EURAMET.M.P-K8

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

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CCM.P-K6, APMP.M.P-K6, APMP.M.P-K6.1 and EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p ~ 100 kPa

Degrees of equivalence relative to the CCM.P-K6 key comparison reference value, expressed in mm²

* participants in APMP.M.P-K6 only
**participants in APMP.M.P-K6.1 only
Orange: participants in EURAMET.M.P-K8

Matrix of equivalence inside APMP.M.P-K6.1:


Lab i	D_i	U_i
	/ mm²	/ mm²
VSL	0.0005	0.011
METAS	-0.0142	0.016
PTB	0.0008	0.0032
NIST	-0.0016	0.0027
NIM	0.0012	0.0033
NPL	0.0000	0.0022
NRC	-0.0014	0.0026

The matrices of equivalence computed inside key comparisons CCM.P-K6, APMP.M.P-K6 and APMP.M.P-K6.1 are available in Summary Results (.PDF file).

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CCM.P-K2 and EURAMET.M.P-K8

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 20 kPa

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.

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 50 kPa

CCM.P-K2 and EURAMET.M.P-K8

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.

APMP.M.P-K9

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

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 70 kPa

CCM.P-K2 and EURAMET.M.P-K8

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.

APMP.M.P-K9

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

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 100 kPa

CCM.P-K2 and EURAMET.M.P-K8

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.

APMP.M.P-K9

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

Comparison

Comparison close

EURAMET.M.P-K8

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Information & contact
Participants

Metrology area, Sub-field	Mass and related quantities, Pressure
Description	Pressure measurements (gauge and absolute mode)
Time of measurements	2009 - 2012
Status	Approved for equivalence

Final Reports of the comparisons	Metrologia, 2016, 53, Tech. Suppl., 07017
Measurand	Effective area of a piston-cylinder unit: 10^-3 m²
Parameters	Pressure: 25 kPa to 200 kPa
Transfer device	Piston-cylinder unit

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 1041
Comments	Results published on 12 September 2016 EURAMET.M.P-K8 results are linked to those of CCM.P-K6 (Gauge pressure) and CCM.P-K2 (Absolute pressure)
Pilot institute	METAS Federal Institute of Metrology Switzerland
Contact person	C. Wüthrich +41 (0) 31 32 33 423

Pilot laboratory
METAS	Federal Institute of Metrology, Switzerland, EURAMET

BEV	Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET

CEM	Centro Español de Metrologia, Spain, EURAMET

CMI	Czech Metrology Institute, Czechia, EURAMET

EIM	Hellenic Institute of Metrology, Greece, EURAMET

FORCE

FORCE Technology, Denmark, EURAMET

HMI/FSB-LPM

now FSB-LPM, FSB - Laboratory for Process Measurements, Croatia, EURAMET

IMBIH

Institute of Metrology of Bosnia and Herzegovina, Bosnia and Herzegovina, EURAMET

INM	National Institute of Metrology, Romania, EURAMET

INRIM

Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET

IPQ	Instituto Portugues da Qualidade, Portugal, EURAMET

KRISS

Korea Research Institute of Standards and Science, Korea, Republic of, APMP

LNE	Laboratoire national de métrologie et d'essais, France, EURAMET

MCCAA-SMI

Malta Competition and Consumer Affairs Authority - Standards and Metrology Institute, Malta, EURAMET

MIKES

VTT Technical Research Centre of Finland Ltd, Centre for Metrology/Mittatekniikan keskus, Finland, EURAMET

MIRS/IMT/LMT

MIRS/Institute of Metals and Technology/Laboratory of Pressure Metrology, Slovenia, EURAMET

MKEH	Hungarian Trade Licensing Office; now BFKH, Hungary, EURAMET

NIS	National Institute for Standards, Egypt, AFRIMETS

NSAI NML

NSAI National Metrology Laboratory, Ireland, EURAMET

PTB	Physikalisch-Technische Bundesanstalt, Germany, EURAMET

UME	TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET

VSL	VSL, Netherlands, EURAMET

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CCM.P-K6, APMP.M.P-K6, APMP.M.P-K6.1 and EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p ~ 20 kPa

Key comparison CCM.P-K6

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 7 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)^1/2, its expanded uncertainty (k = 2).

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 = (x_i - x_j) and U_ij = 2(u_i² + u_j²)^1/2, its expanded uncertainty (k = 2).

Linking APMP.M.P-K6 to CCM.P-K6

PTB is the common participant to both key comparisons CCM.P-K6 and APMP.M.P-K6: its results are used to compute the linkage as explained in Sections 5.1 and 5.2 of the APMP.M.P-K6 Final Report.

Degrees of equivalence relative to the CCM.P-K6 key comparison reference value are obtained for laboratories having participated in APMP.M.P-K6 only, as explained in Section 5.3 of the APMP.M.P-K6 Final Report. They are expressed in mm².

Pair-wise degrees of equivalence among pairs of participants in APMP.M.P-K6 are obtained as explained in Section 5.4 of the APMP.M.P-K6 Final Report. They are expressed in relative terms.

Linking APMP.M.P-K6.1 to CCM.P-K6

The key comparison APMP.M.P-K6.1 is linked to the CCM.P-K6 key comparison through the APMP.M.P-K6 key comparison.
A*STAR is the common participant to both key comparisons APMP.M.P-K6 and APMP.M.P-K6.1: its results are used to compute the linkage as explained in paragraph 4.1 the APMP.M.P-K6.1 Final Report.

Degrees of equivalence relative to the CCM.P-K6 key comparison reference value are obtained for laboratories having participated in APMP.M.P-K6.1 only, as explained in paragraph 4.2 of the APMP.M.P-K6.1 Final Report. They are expressed in mm².

Pair-wise degrees of equivalence among pairs of participants in APMP.M.P-K6.1 are obtained as explained in paragraph 4.3 of the APMP.M.P-K6.1 Final Report. They are expressed in relative terms.

Linking EURAMET.M.P-K8 to CCM.P-K6

PTB and VSL provide the link between key comparisons CCM.P-K6 and EURAMET.M.P-K8 for the following nominal pressures: 25 kPa, 50 kPa, 75 kPa and 100 kPa.
The linkage process is described in Section 11 of the EURAMET.M.P-K8 Final Report.

The measurements of EURAMET.M.P-K8 at the nominal pressure 25 kPa are linked with the averaged value of the 20 kPa and 30 kPa measurements of the CCM comparison, and those at the nominal pressure 75 kPa are linked with the averaged value of the 70 kPa and 80 kPa measurements of the CCM comparison.

Therefore, the degrees of equivalence of the laboratories having participated in EURAMET.M.P-K8 for 25 kPa and 75 kPa are shown on a different graph from the ones for the participants in CCM.P-K6.

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CCM.P-K6 and EURAMET.M.P-K8

Key comparison CCM.P-K6

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p = 50 kPa

Linking EURAMET.M.P-K8 to CCM.P-K6

Therefore, the degrees of equivalence of the laboratories having participated in EURAMET.M.P-K8 for 25 kPa and 75 kPa are shown on a different graph from the ones for the participants in CCM.P-K6.

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CCM.P-K6 and EURAMET.M.P-K8

Key comparison CCM.P-K6

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p = 70 kPa

Linking EURAMET.M.P-K8 to CCM.P-K6

Therefore, the degrees of equivalence of the laboratories having participated in EURAMET.M.P-K8 for 25 kPa and 75 kPa are shown on a different graph from the ones for the participants in CCM.P-K6.

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CCM.P-K6, APMP.M.P-K6, APMP.M.P-K6.1 and EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p ~ 100 kPa

Key comparison CCM.P-K6

Linking APMP.M.P-K6 to CCM.P-K6

PTB is the common participant to both key comparisons CCM.P-K6 and APMP.M.P-K6: its results are used to compute the linkage as explained in Sections 5.1 and 5.2 of the APMP.M.P-K6 Final Report.

Pair-wise degrees of equivalence among pairs of participants in APMP.M.P-K6 are obtained as explained in Section 5.4 of the APMP.M.P-K6 Final Report. They are expressed in relative terms.

Linking APMP.M.P-K6.1 to CCM.P-K6

Pair-wise degrees of equivalence among pairs of participants in APMP.M.P-K6.1 are obtained as explained in paragraph 4.3 of the APMP.M.P-K6.1 Final Report. They are expressed in relative terms.

Linking EURAMET.M.P-K8 to CCM.P-K6

Therefore, the degrees of equivalence of the laboratories having participated in EURAMET.M.P-K8 for 25 kPa and 75 kPa are shown on a different graph from the ones for the participants in CCM.P-K6.

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CCM.P-K2 and EURAMET.M.P-K8

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 20 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 8 mm²
u_R = 0.001 7 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-K8 to CCM.P-K2

PTB and INRiM provides the link between key comparisons CCM.P-K2 and EURAMET.M.P-K8, having participated in both comparisons. The linkage process is described in Section 11 of the EURAMET.M.P-K8 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.

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 50 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 0 mm²
u_R = 0.000 8 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:

Linking EURAMET.M.P-K8 to 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.

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 70 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 = 335.745 3 mm²
u_R = 0.000 5 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:

Linking EURAMET.M.P-K8 to CCM.P-K2

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

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 100 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 = 335.745 1 mm²
u_R = 0.000 7 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:

Linking EURAMET.M.P-K8 to CCM.P-K2

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

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CCM.P-K6, APMP.M.P-K6, APMP.M.P-K6.1 and EURAMET.M.P-K8

Key comparison CCM.P-K6

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p = 20 kPa

x_i : result obtained from the mean of measurements by laboratory i
u_i : combined standard uncertainty of x_i

Lab i	x_i / mm²	u_i / x_i / 10^-6	Date of measurement
VSL	335.745 4	16	Aug-Sep 1998
METAS	335.718 3	74	Nov-Dec 1998
PTB	335.744 4	5.6	Feb-Mar 1999
NIST	335.743 3	3.1	Sep-Oct 1999
NIM	335.746 2	4.3	Nov-Dec 1999
NPL	335.743 9	6.8	Aug-Sep 2000
NRC	335.744 6	3.4	Jul-Sep 2001

Key comparison APMP.M.P-K6

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p = 21.4 kPa

x_i : result obtained from the mean of measurements by laboratory i
u_i : combined standard uncertainty of x_i

Lab i	x_i / mm²	u_i / x_i / 10^-6	Date of measurement
NPLI	335.737 3	15.80	Oct 1998
KRISS	335.742 1	11.10	Apr 1999
NMIA	335.749 7	12.60	Feb 2001
NMIJ	335.738 8	8.80	Sep 1999
PTB	335.737 6	6.40	Mar 2001
MSL	335.749 3	11.80	May 1999
*ASTAR**	335.737 5	19.20	Nov 1998
NML-SIRIM	335.744 8	11.40	Jan 1999
SCL	335.747 7	18.00	Jun 1999
NMISA	335.740 7	14.60	Oct 1999

Key comparison APMP.M.P-K6.1

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.75 mm²
NOMINAL PRESSURE : p = 21.4 kPa

x_i : result obtained from the mean of measurements by laboratory i
U_Labi : relative expanded uncertainty (k =2) of x_i

Lab i	x_i / mm²	U_Lab_i / 10^-6	Date of measurement
CMS/ITRI	335.623 5	30.2	Apr 03 - Apr 04
*ASTAR**	335.633 9	22.0	Apr 03 - Apr 04
NIMT	335.635 1	18.6	Apr 03 - Apr 04

Key comparison EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly determined in gauge pressure mode
NOMINAL VALUE : 980 mm²
NOMINAL PRESSURE : p = 25 kPa

The laboratory individual measurements of the participants in the key comparison EURAMET.M.P-K8 are given in Table 7 on page 26 of the EURAMET.M.P-K8 Final Report.

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CCM.P-K6 and EURAMET.M.P-K8

Key comparison CCM.P-K6

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p = 50 kPa

x_i : result obtained from the mean of measurements by laboratory i
u_i : combined standard uncertainty of x_i

Lab i	x_i / mm²	u_i / x_i / 10^-6	Date of measurement
VSL	335.745 5	16	Aug-Sep 1998
METAS	335.727 6	39	Nov-Dec 1998
PTB	335.744 8	4.2	Feb-Mar 1999
NIST	335.743 0	3.1	Sep-Oct 1999
NIM	335.744 3	4.2	Nov-Dec 1999
NPL	335.744 3	3.0	Aug-Sep 2000
NRC	335.743 3	2.9	Jul-Sep 2001

Key comparison EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly determined in gauge pressure mode
NOMINAL VALUE : 980 mm²
NOMINAL PRESSURE : p = 50 kPa

The laboratory individual measurements of the participants in the key comparison EURAMET.M.P-K8 are given in Table 7 on page 26 of the EURAMET.M.P-K8 Final Report.

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CCM.P-K6 and EURAMET.M.P-K8

Key comparison CCM.P-K6

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p = 70 kPa

x_i : result obtained from the mean of measurements by laboratory i
u_i : combined standard uncertainty of x_i

Lab i	x_i / mm²	u_i / x_i / 10^-6	Date of measurement
VSL	335.745 3	16	Aug-Sep 1998
METAS	335.728 5	26	Nov-Dec 1998
PTB	335.745 3	5.0	Feb-Mar 1999
NIST	335.742 9	3.1	Sep-Oct 1999
NIM	335.745 2	4.2	Nov-Dec 1999
NPL	335.744 3	2.3	Aug-Sep 2000
NRC	335.743 3	2.8	Jul-Sep 2001

Key comparison EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly determined in gauge pressure mode
NOMINAL VALUE : 980 mm²
NOMINAL PRESSURE : p = 75 kPa

The laboratory individual measurements of the participants in the key comparison EURAMET.M.P-K8 are given in Table 7 on page 26 of the EURAMET.M.P-K8 Final Report.

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CCM.P-K6, APMP.M.P-K6, APMP.M.P-K6.1 and EURAMET.M.P-K8

Key comparison CCM.P-K6

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p = 100 kPa

x_i : result obtained from the mean of measurements by laboratory i
u_i : combined standard uncertainty of x_i

Lab i	x_i / mm²	u_i / x_i / 10^-6	Date of measurement
VSL	335.745 0	16	Aug-Sep 1998
METAS	335.730 4	24	Nov-Dec 1998
PTB	335.745 3	3.8	Feb-Mar 1999
NIST	335.742 9	3.0	Sep-Oct 1999
NIM	335.745 7	4.1	Nov-Dec 1999
NPL	335.744 5	1.8	Aug-Sep 2000
NRC	335.743 1	2.7	Jul-Sep 2001

Key comparison APMP.M.P-K6

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.7 mm²
NOMINAL PRESSURE : p = 101.2 kPa

x_i : result obtained from the mean of measurements by laboratory i
u_i : combined standard uncertainty of x_i

Lab i	x_i / mm²	u_i / x_i / 10^-6	Date of measurement
NPLI	335.737 7	15.80	Oct 1998
KRISS	335.739 7	11.10	Apr 1999
NMIA	335.741 0	12.60	Feb 2001
NMIJ	335.737 8	8.80	Sep 1999
PTB	335.739 7	5.90	Mar 2001
MSL	335.741 0	11.70	May 1999
*ASTAR**	335.734 0	19.10	Nov 1998
NML-SIRIM	335.742 0	11.40	Jan 1999
SCL	335.742 0	17.60	Jun 1999
NMISA	335.732 0	14.60	Oct 1999

Key comparison APMP.M.P-K6.1

MEASURAND : Effective area of a piston-cylinder assembly
NOMINAL VALUE : 335.75 mm²
NOMINAL PRESSURE : p = 101.4 kPa

x_i : result obtained from the mean of measurements by laboratory i
U_Labi : relative expanded uncertainty (k =2) of x_i

Lab i	x_i / mm²	U_Lab_i / 10^-6	Date of measurement
CMS/ITRI	335.624 4	30.0	Apr 03 - Apr 04
*ASTAR**	335.632 2	21.2	Apr 03 - Apr 04
NIMT	335.636 7	17.8	Apr 03 - Apr 04

Key comparison EURAMET.M.P-K8

MEASURAND : Effective area of a piston-cylinder assembly determined in gauge pressure mode
NOMINAL VALUE : 980 mm²
NOMINAL PRESSURE : p = 100 kPa

The laboratory individual measurements of the participants in the key comparison EURAMET.M.P-K8 are given in Table 7 on page 26 of the EURAMET.M.P-K8 Final Report.

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CCM.P-K2 and EURAMET.M.P-K8

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 20 kPa

x_i results obtained by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 50 kPa

x_i results obtained by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 70 kPa

x_i results obtained by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

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CCM.P-K2, EURAMET.M.P-K8 and APMP.M.P-K9

MEASURAND Effective area of a piston-cylinder assembly

NOMINAL VALUE 335.7 mm²

NOMINAL PRESSURE 100 kPa

x_i results obtained by laboratory i, Lab_i

u_i combined standard uncertainty of x_i

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Key and supplementary comparisons - Print out