Comparison
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MEASURAND : Central length of gauge blocks measured by interferometry according to ISO 3650

STEEL GAUGE BLOCKS
NOMINAL VALUES : 8 gauge blocks from 1 mm to 90 mm

Degrees of equivalence, Dik and expanded uncertainty Uik, of each laboratory i with respect to the reference value for each gauge block expressed in nm:

Comparison
Comparison close

MEASURAND : Central length of gauge blocks measured by interferometry according to ISO 3650

STEEL GAUGE BLOCKS
NOMINAL VALUES : 8 gauge blocks from 1 mm to 90 mm

Degrees of equivalence, Dik and expanded uncertainty Uik, for each nominal length:

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

Comparison
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RMO comparison
Linked comparison
EURAMET.L-K1.2
Metrology area, Sub-field Length, Dimensional Metrology
Description Gauge blocks by interferometry
Time of measurements 2010
Status Approved for equivalence
Final Reports of the comparisons
References

EURAMET.L-K1.2 Technical Protocol

Measurand Central length: 1 mm, 5 mm, 8 mm, 10 mm, 25 mm, 40 mm, 60 mm and 90 mm
Transfer device Eight steel gauge blocks
Comparison type Key Comparison
Consultative Committee CCL (Consultative Committee for Length )
Conducted by EURAMET (European Association of National Metrology Institutes)
RMO Internal Identifier EURAMET Project No 1138
Comments

Results published on 27 February 2012

Gauge blocks by interferometry

Pilot institute HMI/FSB-LPMD
FSB - Laboratory for Precise Measurements of Length
Croatia
Contact person V. Mudronja
vedran.mudronja@fsb.hr
+385 1 616 8327
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
HMI/FSB-LPMD

FSB - Laboratory for Precise Measurements of Length, Croatia, EURAMET

DFM

Danish Fundamental Metrology Ltd, Denmark, EURAMET

GUM

Glowny Urzad Miar, Central Office of Measures, Poland, EURAMET

MKEH

Hungarian Trade Licensing Office; now BFKH, Hungary, EURAMET

NIS

National Institute for Standards, Egypt, AFRIMETS

Comparison
Comparison close

MEASURAND : Central length of gauge blocks measured by interferometry according to ISO 3650

STEEL GAUGE BLOCKS
NOMINAL VALUES : 8 gauge blocks from 1 mm to 90 mm

For each nominal value Lk, the reference value, xRk, is obtained from the weighted mean of the participant results xik with weigths based on the participants combined standard uncertainties, as explained in Chapter 8 of the Final Report. The corresponding standard uncertainty, uRk, is based on the internal standard deviation of the measurement results (see also in Chapter 8).

For each nominal value Lk, the degree of equivalence of each laboratory i with respect to the reference value is given by a pair of terms: Dik = xik - xRk, and Uik, its expanded uncertainty (k = 2), with Uik = 2[uik2 - uRk2]1/2.
Pair-wise degrees of equivalence are not computed for this key comparison.

NIS results were not taken into account in the calculation of the key comparison reference values and the degrees of equivalence as they suspected that certain influence parameters (possibly temperature) were not accounted for in their measurements.

Comparison
Comparison close

MEASURAND : Central length of gauge blocks measured by interferometry according to ISO 3650

STEEL GAUGE BLOCKS
NOMINAL VALUES : 8
gauge blocks from 1 mm to 90 mm

xik : result of measurement carried out by laboratory i for gauge block with nominal length Lk, expressed as the deviation from nominal length in nm
uik : combined standard uncertainty of xik reported by laboratory i