| Metrology area, Sub-field | Mass and related quantities, Gravity |
| Description | Free-fall acceleration |
| Time of measurements | 2023 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| References | |
| Measurand | Free-fall acceleration |
| Parameters | Gravimetric Earth tides, atmospheric and polar motion effects |
| 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 | Comparison carried out at 10 stations at comparison site TMGO, Boulder, CO USA. |
| Pilot institute |
NIST
National Institute of Standards and Technology United States |
| Contact person | D. Newell 001 301 975 4228 |
| Pilot laboratory | |
|---|---|
| NIST |
National Institute of Standards and Technology, United States, SIM |
| BEV |
Bundesamt für Eich- und Vermessungswesen, Austria, EURAMET |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| CMS |
ITRI Center for Measurement Standards, Chinese Taipei, APMP |
| FGI |
Finnish Geospatial Research Institute, Finland, EURAMET |
| KRISS |
Korea Research Institute of Standards and Science, Korea, Republic of, APMP |
| NIM |
National Institute of Metrology, China, APMP |
| NMIJ AIST |
National Metrology Institute of Japan, Japan, APMP |
| NMISA |
National Metrology Institute of South Africa, South Africa, AFRIMETS |
| NRC |
National Research Council, Canada, SIM |
| ON/DSHO |
Observatório Nacional/Serviço Nacional da Hora, Brazil, SIM |
| PTB |
Physikalisch-Technische Bundesanstalt, Germany, EURAMET |
| SASO-NMCC |
National Measurement and Calibration Center - Saudi Standards, Metrology and Quality Organization, Saudi Arabia, GULFMET |
| UME |
TÜBITAK Ulusal Metroloji Enstitüsü, Türkiye, EURAMET |
| VUGTK/RIGTC |
Research Institute of Geodesy, Topography and Cartography, Czechia, EURAMET |
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