CCM.G-K2, EURAMET.M.G-K2 and SIM.M.G-K1
MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2
Degrees of equivalence: Dk and expanded uncertainty Uk (k = 2), both expressed in µGal
CCM.G-K2, EURAMET.M.G-K2 and SIM.M.G-K1
MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2
Degrees of equivalence: Dk and expanded uncertainty Uk (k = 2), both expressed in µGal
CCT.G-K2 EURAMET.M.G-K2 SIM.M.G-K1
Results are presented under A4 printable format in Summary Results (PDF file).
| Metrology area, Sub-field | Mass and related quantities, Gravity |
| Description | Free-fall acceleration |
| Time of measurements | 2016 |
| Status | Approved for equivalence |
| Final Reports of the comparisons | |
| References | |
| Measurand | Determination of free-fall acceleration corrected for gravimetric Earth tides, atmospheric and polar motion effects at 10 stations at comparison site TMGO, Boulder, CO USA |
| Comparison type | Key Comparison |
| Consultative Committee | CCM (Consultative Committee for Mass and Related Quantities) |
| Conducted by | SIM (Inter-American Metrology System) |
| Comments | This comparison is to be linked to CCM.G-K1 and CCM.G-K2 via two of the participants Results published on 21 July 2017 Free-fall acceleration
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| Pilot institute |
NIST
National Institute of Standards and Technology United States |
| Contact person | D. Newell 001 301 975 4228 |
This page proposes print-out on A4 paper (portrait) of the comparison details (best printed out using a black and white printer).
Please, select items to be printed out, then click on "OK" :
CCM.G-K2, EURAMET.M.G-K2 and SIM.M.G-K1
MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2
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A weighted least-square adjustement is applied to the set of measurements obtained from absolute gravimeters AG(k) at Stations j, gjk, with standard uncertainty ujk, in order to evaluate the gravity value Gj at each Station j, as well as the offset Dk for absolute gravimeter AG(k), as explained in Section 6.2 "Second and final solution" of the Final Report).
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| The degree of equivalence of absolute gravimeter AG(k) is given by a pair of terms: Dk and Uk, its expanded uncertainty at a 95 % level of confidence, both expressed in µGal. |
The linkage of EURAMET.M.G-K2 comparison results to CCM.G-K2 comparison results are made by means of four laboratory absolute gravimeters that have been used in both comparisons, and the linking process is described in the EURAMET.M.G-K2 Final Report.
The linkage of SIM.M.G-K1 comparison results to CCM.G-K2 comparison results was made using the FG5X-216 gravimeter through EURAMET.M.G-K2. Tthe linking process is described in the SIM.M.G-K1 Final Report Section 7.3.
CCM.G-K2, EURAMET.M.G-K2 and SIM.M.G-K1
MEASURAND : Free-fall acceleration
NOMINAL VALUE : 9.81 m/s2
AG(k) : absolute gravimeter of Laboratory k
Station j : designation of the station where the measurement was carried out
gjk : gravity value at Station j and height Hjk after substraction of 980 960 000 µGal
ujk : combined standard uncertainty declared by Laboratory k
The comparison was performed in 2013
In general, each participant communicated gravity measurements for three of the fifteen stations used
Raw measurements from Absolute Gravimeters reported by the participants in EURAMET.M.G-K2 are given in Table 4 on page 8 of the Final Report.
The comparison was performed in 2015.
Raw measurements from Absolute Gravimeters reported by the participants in SIM.M.G-K1 are given in Table 5 on pp. 7-8 of the Final Report.
The comparison was performed in 2016.
