Key comparison CCM.V-K1.A
MEASURAND :
NOMINAL VALUE :
xi:
ui:
Lab i
Kinematic viscosity
10 mm2/s at 20 °C
result of measurement carried out by laboratory i
relative standard uncertainty of x i
xi
ui
/ (mm /s)
/ 10
Date of
measurement
9.6355
9.6659
9.6633
9.5970
9.6590
9.6530
9.6598
9.6557
9.6537
9.6726
9.6558
9.6640
9.6566
9.6452
9.6497
9.6824
9.6718
9.6046
1.00
0.64
0.38
0.65
0.28
0.80
0.41
0.47
0.85
0.96
0.46
1.30
1.03
0.69
2.50
1.58
1.26
3.20
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
May - July 2002
2
BNM-LNE
CANNON
GUM
CNR-IMGC
NMIJ
NMi-VSL
NRCCRM
PTB
SMU
UME
VNIIM
BEV
CENAM
INM(RO)
IPQ
NIS
NPLI
NML-SIRIM
-3
Laboratories maintaining an independent scale
The BIPM key comparison database, June 2008
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Key comparison COOMET.M.V-K1
MEASURAND :
NOMINAL VALUE :
x i COO:
u i COO:
Kinematic viscosity
30 mm2/s at 20 °C
result of measurement carried out by laboratory i
relative standard uncertainty of x i COO
Lab i
x i COO
/ (mm /s)
/ 10
Date of
measurement
28.545
28.539
28.529
28.557
2.1
1.2
1.0
1.0
2005
2005
2005
2005
2
BelGIM
UkrCSM
BIM
VNIIM
u i COO
-3
In order to link the results of key comparison COOMET.M.V-K1, taken at nominal value 30 mm 2/s, to those of key comparison
CCM.V-K1.A, taken at nominal value 10 mm2/s, COOMET data were evaluated for a kinematic viscosity of 10 mm 2/s, according
to the procedure described in Section 4 of the COOMET.M.V-K1 Final Report, which is based of the common participation of
VNIIM in both key comparisons.
The resulting values are given in the following table for the three laboratories which participated in COOMET.M.V-K1 only.
MEASURAND :
NOMINAL VALUE :
xi:
ui:
Lab i
Kinematic viscosity
10 mm2/s at 20 °C
result of measurement carried out by laboratory i (evaluated for the CCM.V-K1.A nominal value)
relative standard uncertainty of x i
xi
ui
/ (mm /s)
/ 10
Date of
measurement
9.6517
9.6497
9.6463
2.2
1.4
1.2
2005
2005
2005
2
BelGIM
UkrCSM
BIM
The BIPM key comparison database, June 2008
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Key comparison CCM.V-K1.A
MEASURAND : Kinematic viscosity
2
NOMINAL VALUE : 10 mm /s at 20 °C
The key comparison reference value, x R, is calculated as the arithmetic mean of the results of those
laboratories which maintain an independent scale. Its standard uncertainty, u R, is calculated as the
uncertainty of the arithmetic mean. x R = 9.6519 mm2/s and u R = 0.0062 mm2/s.
The degree of equivalence of each laboratory with respect to the key comparison reference value is given
by a pair of terms: D i = x i - x R and U i , its expanded uncertainty (k = 2), both expressed in (mm2/s).
The derivation of U i may be found in the CCM.V-K1 Final Report.
The degree of equivalence between two laboratories i and j is given by a pair of terms: D ij = x i - x j and
U ij , its expanded uncertainty (k = 2), both expressed in (mm2/s), U ij = 2x R(u i 2 + u j 2)1/2. The full matrix of equivalence is not computed here.
The degrees of equivalence of the three laboratories which participated in key comparison COOMET.M.V-K1 for nominal value 30 mm 2/s,
relative to the CCM.V-K1.A key comparison reference value are deduced from the results evaluated for 10 mm2/s as explained in Section 4 of
the COOMET.M.V-K1 Final Report.
Lab i
Di
Ui
2
BNM-LNE
CANNON
GUM
CNR-IMGC
NMIJ
NMi-VSL
NRCCRM
PTB
SMU
UME
VNIIM
Lab i
-2
/ (mm /s)x10
1.8
-1.6
1.2
1.4
0.8
1.1
1.2
-5.5
0.6
0.7
1.5
0.1
0.8
0.8
0.9
0.4
1.5
0.2
1.7
2.1
0.9
0.4
Di
Ui
2
BEV
CENAM
INM(RO)
IPQ
NIS
NPLI
NML-SIRIM
/ (mm /s)x10-2
2.5
1.2
2.0
0.5
1.4
-0.7
4.8
-0.2
3.1
3.0
2.5
2.0
6.2
-4.7
BelGIM
UkrCSM
BIM
-0.02
-0.22
-0.56
5.9
4.9
4.7
CCM.V-K1.A participants maintaining an independent scale
participants in COOMET.M.V-K1 only
The BIPM key comparison database, June 2008
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CCM.V-K1.A and COOMET.M.V-K1 - Kinematic viscosity of Liquid A (10 mm2/s)
Degrees of equivalence D i and expanded uncertainty U i (k = 2)
10.0
6.0
4.0
2
Di = (xi - x R) / (mm /s)x10
-2
8.0
2.0
0.0
-2.0
-4.0
-6.0
-8.0
BIM
UkrCSM
BelGIM
NML-SIRIM
NPLI
NIS
IPQ
INM(RO)
CENAM
BEV
VNIIM
UME
SMU
PTB
NRCCRM
NMi-VSL
NMIJ
CNR-IMGC
GUM
CANNON
BNM-LNE
-10.0
Red diamonds: CCM.V-K1.A participants maintaining an independent scale
Open red circles: other CCM.V-K1.A participants
Green triangles: participants in COOMET.M.V-K1 only
The BIPM key comparison database, June 2008
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