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MEASURAND : Effective area of Piston-cylinder unit DH 6594 determined from dimensional measurements
NOMINAL VALUE : 10 cm2

Degrees of equivalence Di and expanded uncertainties Ui (k = 2) expressed in 10-6

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MEASURAND : Effective area of Piston-cylinder unit DHI 107 determined from dimensional measurements
NOMINAL VALUE : 10 cm2

Degrees of equivalence Di and expanded uncertainties Ui (k = 2) expressed in 10-6

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MEASURAND : Effective area of Piston-cylinder unit DH 6594 determined from dimensional measurements
NOMINAL VALUE : 10 cm2

   
Lab iDiUi
 / 10-6/ 10-6
BNM-LNE-4.35.8
IMGC-CNR3.521.2
NIST0.29.4
PTB0.67.8

The full matrix of equivalence is available in Summary Results (summary of the results as a .PDF file).

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MEASURAND : Effective area of Piston-cylinder unit DHI 107 determined from dimensional measurements
NOMINAL VALUE : 10 cm2

   
Lab iDiUi
 / 10-6/ 10-6
BNM-LNE-6.06.5
IMGC-CNR-1.222.7
NIST4.310.1
PTB2.99.6

The full matrix of equivalence is available in Summary Results (summary of the results as a .PDF file).

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CC comparison
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CCM.P-K1.a
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Metrology area, Sub-field Mass and related quantities, Pressure
Description Pressure measurements, Phase A1 (gauge mode)
Time of measurements 1995 - 1997
Status Approved for equivalence
Final Reports of the comparisons
Metrologia, 1999, 36, 657-662
Measurand Effective area of piston-cylinder units
Nominal area: 10 cm2
Parameters Pressure: 50 kPa to 1 MPa
Transfer device Two piston-cylinder units, serial numbers DH 6594 and DHI 107
Comparison type Key Comparison
Consultative Committee CCM (Consultative Committee for Mass and Related Quantities)
Conducted by CCM (Consultative Committee for Mass and Related Quantities)
Comments

"Phase A1" is the first of a series of 3 measurements phases described in Report of the 6th Meeting of the CCM , 1996, G35-36. The other phases, "Phase A2" and "Phase B", correspond respectively to key comparison CCM.P-K1.b and key comparison CCM.P-K1.c.

 

Results published on 29 May 2001

Pressure: effective area of piston-cylinder units

 

 
Pilot institute PTB
Physikalisch-Technische Bundesanstalt
Germany
Contact person Wladimir Sabuga

+49 (0) 531 592 3230
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
PTB

Physikalisch-Technische Bundesanstalt, Germany, EURAMET

NIST

National Institute of Standards and Technology, United States, SIM

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MEASURAND : Effective area of Piston-cylinder unit DH 6594 determined from dimensional measurements
NOMINAL VALUE : 10 cm2

The key comparison reference value, xR, is obtained as the non-weighted average of the results from the four participants (the two results of the PTB were averaged before the reference value calculation). xR is not explicitly given here since the unit is currently used in a EUROMET comparison. The standard uncertainty the reference value, uR, is taken as the experimental standard deviation of the mean.
uR / xR = 1.7 10-6.

The degree of equivalence of each laboratory with respect to the reference value is given by a pair of terms:
Di = (xi - xR)/xR, the relative deviation from the reference value, and
Ui = 2(ui2 + uR2)1/2 / xR, its expanded uncertainty (k = 2).

The degree of equivalence between two laboratories is given for each transfer standard by a pair of terms:
Dij = Di - Dj = (xi - xj) / xR, the relative difference between their results, and
Uij = 2(ui2 + uj2)1/2 / xR, its expanded uncertainty (k = 2).
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MEASURAND : Effective area of Piston-cylinder unit DHI 107 determined from dimensional measurements
NOMINAL VALUE : 10 cm2

The key comparison reference value, xR, is obtained as the non-weighted average of the results from the four participants (the two results from the BNM-LNE were averaged before the reference value calculation). xR = 9.805188 cm2.
The standard uncertainty of the reference value, uR, is taken as the experimental standard deviation of the mean.
uR / xR = 2.4 10-6.

The degree of equivalence of each laboratory with respect to each reference value is given by a pair of terms:
Di = (xi - xR)/xR, the relative deviation from the reference value, and
Ui = 2(ui2 + uR2)1/2 / xR, its expanded uncertainty (k = 2)

The degree of equivalence between two laboratories is given for each transfer standard by a pair of terms:
Dij = Di - Dj = (xi - xj) / xR, the relative difference between their results, and
Uij = 2(ui2 + uj2)1/2 / xR, its expanded uncertainty (k = 2)
Comparison
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MEASURAND : Effective area of Piston-cylinder unit DH 6594 determined from dimensional measurements
NOMINAL VALUE : 10 cm2

xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi

 Lab i xi
/ cm2		 ui / xi
/ 10-6		 Date of measurement
 PTB  * 3.4 95-06
 IMGC-CNR * 10.5 96-03
 NIST * 4.4 96-09
 BNM-LNE * 2.4 97-03
 PTB * 3.7 97-09

Note: PTB performed 2 measurements.

* The exact effective area of piston-cylinder DH 6594 is not reported here because the assembly is currently being used as transfer standard in a EUROMET comparison.

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MEASURAND : Effective area of Piston-cylinder unit DHI 107 determined from dimensional measurements
NOMINAL VALUE : 10 cm2

xi : result of measurement carried out by laboratory i
ui : combined standard uncertainty of xi

 Lab i xi
/ cm2		 ui / xi
/ 10-6		 Date of measurement
 BNM-LNE 9.805118 2.3 95-06
 NIST 9.805230 4.5 95-12
 IMGC-CNR 9.805176 11.1 96-06
 PTB 9.805216 4.2 96-09
 BNM-LNE 9.805139 2.2 97-09

Note: BNM-LNE performed 2 measurements.