MEASURAND : Distance between the centre line position of the reference line and the centre line position of the measured line of the linescale
NOMINAL VALUES : 39 nominal values from 1 mm to 300 mm

Degrees of equivalence relative to the respective key comparison reference values Dik and associated expanded uncertainty (coverage factor 2) Uik for the 39 nominal positions

MEASURAND : Distance between the centre line position of the reference line and the centre line position of the measured line of the linescale
NOMINAL VALUES : 39 nominal values from 1 mm to 300 mm

Degrees of equivalence relative to the respective key comparison reference values Dik and associated expanded uncertainty (coverage factor 2) Uik for the 39 nominal positions

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

Comparison
Comparison close
RMO comparison
Linked comparison
EURAMET.L-K7.2014
Metrology area, Sub-field Length, Dimensional Metrology
Description Linescales
Time of measurements 2014
Status Approved for equivalence
Final Reports of the comparisons
References

EURAMET.L-K7.2014 Registration and Progress Form

EURAMET.L-K7.2014 Technical Protocol

Measurand Distance between center lines to the center line labelled "0"
Transfer device 300 mm long linescale
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 1320
Comments

Results published on 11 September 2015

Linescales

Pilot institute LNE
Laboratoire national de métrologie et d'essais
France
Contact person José SALGADO
jose.salgado@lne.fr
+33140433957
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
LNE

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

Puslit KIM-LIPI

Research Center for Calibration, Instrumentation and Metrology – Indonesian Institute of Sciences, Indonesia, APMP

MEASURAND : Distance between the centre line position of the reference line and the centre line position of the measured line of the linescale

NOMINAL VALUES : 39 nominal values from 0.1 mm to 300 mm

For each line position k, the key comparison reference value xRk is obtained from the weighted mean xwk (with weights wik based on each reported uncertainty) of the participants' values xik by adding a constant Ck chosen such that the reference value is the nominal length Lk = xwk + Ck. The standard uncertainty uRk of the key comparison reference value is obtained from the reported standard uncertainties of the laboratories.

For each line position k the degree of equivalence of laboratory i with respect to the key comparison reference value is given by two terms both expressed in µm:
Dik = (xik + Ck) - xRk = xik - xwk, and Uik its expanded uncertainty (coverage factor 2),  Uik = 2(uik2 - uRk2)1/2.

The calculation of the degree of equivalence between two laboratories i and j is not recommended for comparisons involving many measurands since it cannot be expressed with a single pair of terms.  It would have to be calculated separately for each line position k and would then be given by a pair of terms both expressed in µm: Dijk = xik - xjk, and Uijk its expanded uncertainty (coverage factor 2), Uijk = 2(uik2 - ujk2)1/2.

MEASURAND : Distance between the centre line position of the reference line and the centre line position of the measured line of the linescale
NOMINAL VALUES : 39 nominal values from 1 mm to 300 mm

xik : deviation from the nominal value reported by laboratory i for the line centre at nominal distance Lk expressed as the deviation from nominal length in nm
u ik : standard uncertainty of xik reported by laboratory i

The measurements were carried out in November 2014.