Open Access
Table 2
Calibration history of a reference sphere's diameter.
| Date | 17.05.2004 | 26.02.2007 | 16.06.2009 | 14.06.2011 | 13.06.2013 |
|---|---|---|---|---|---|
| d in mm | 14.917 90 | 14.917 90 | 14.918 00 | 14.917 94 | 14.917 99 |
| u in μm | 0.11 | 0.11 | 0.11 | 0.10 | 0.10 |
| Date | 23.06.2015 | 28.07.2017 | 26.07.2019 | 21.07.2021 | |
| d in mm | 14.917 90 | 14.917 96 | 14.917 88 | 14.917 99 | |
| u in μm | 0.10 | 0.10 | 0.10 | 0.10 |
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