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Results
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MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2

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Results
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MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2

Degrees of equivalence: Dk and expanded uncertainty Uk (k = 2), both expressed in µGal

Comparison of these degrees of equivalence with those obtained in previous exercises is given in Section 9 of the Final Report. It shows good agreement.

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

Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO-31-0 Annex B Rule B.

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RMO comparison
Linked comparison
EURAMET.M.G-K1
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Metrology area, Sub-field Mass and related quantities, Gravity
Description Free-fall acceleration
Time of measurements 2011
Status Approved for equivalence
Final Reports of the comparisons
EURAMET.M.G-K1 Final Report, 2012, 14 pages
Metrologia, 2012, 49, Tech. Suppl., 07014
Measurand Free-fall acceleration: 9.81 m/s2

The non-SI unit "Gal" is normally used in this field:
1 Gal = 10-2 m/s2
Transfer device Comparison of absolute gravimeters at the Underground Laboratory for Geodynamics in Walferdange, Luxemburg
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 1186
Comments

Results published on 22 October 2012

Free-fall acceleration
Pilot institute METAS
Federal Institute of Metrology
Switzerland
Contact person Henri BAUMANN

+41 (0) 31 32 33 243
First Name Last Name
wwww@ww.www +356719836 Institute 1 Institute 1 Khmelnitskiy
Pilot laboratory
METAS

Federal Institute of Metrology, Switzerland, EURAMET

BEV

Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET

FGI

Finnish Geospatial Research Institute, Finland, EURAMET

INRIM

Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET

LNE-SYRTE

Observatoire de Paris/Systèmes de Référence Temps-Espace, France, EURAMET

VUGTK/RIGTC

Research Institute of Geodesy, Topography and Cartography, Czechia, EURAMET

Comparison
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Results
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MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2

The data processing is explained in Section 7 of the Final Report and is based on a global weighted least-square adjustement of the measurements after correction for self-attraction, laser beam diffraction and Superconducing Gravimeter observations. This makes it possible to evaluate the gravity value Gj at each Station j, as well as the offset Dk for absolute gravimeter AG(k), and associated expanded uncertainties (k = 2).
Gj is the key comparison reference value for Station j. It associated expanded uncertainty is denoted Uj. Gj and Uj are expressed in µGal with 1 Gal = 10-2 m/s2. The Gj's values are the g-values minus the constant value 98 096 000.0 µGal.

The degree of equivalence of absolute gravimeter AG(k) is given by a pair of terms: Dk and Uk, its expanded uncertainty with coverage factor equal to 2, both expressed in µGal.
Unless otherwise stated, in the final numbers presented here, rounding has been applied according to ISO-31-0 Annex B Rule B.
Comparison
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Results
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MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2

Raw measurements from Absolute Gravimeters are given in Table 3 of the Final Report.