| Metrology area, Sub-field | Length, Dimensional Metrology |
| Description | Determination of roundness in the equator of two alumina spheres |
| Time of measurements | 2020 |
| Status | Approved |
| Final Reports of the comparisons | |
| References |
EURAMET_Project_1489_(EURAMET.L-S30)_Final_Report_Feb2022 EURAMET.L-S30 Technical protocol (Draft A.4)
EURAMET_Project_1489_(EURAMET.L-S30)_Progress_Report_Oct2020 |
| Measurand | Roundness Spheres with diameters of 20 mm and 25 mm |
| Parameters | Peak-to-valley roundness deviation (RONt) |
| Transfer device | Two alumina spheres |
| Comparison type | Supplementary Comparison |
| Consultative Committee | CCL (Consultative Committee for Length ) |
| Conducted by | EURAMET (European Association of National Metrology Institutes) |
| RMO Internal Identifier | EURAMET 1489 |
| Comments | Peak-to-valley roundness deviation (RONt) with reference to the least squares reference circle (LSCI) and, if possible, to the minimum zone reference circles (MZCI), in accordance with ISO/TS 12181-1:2003 |
| Pilot institute |
CEM
Centro Español de Metrologia Spain |
| Contact person | Emilio PRIETO +34 91 807 4716 |
| Additional |
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