Calibration of ring and plug gauges
Project Description
This comparison has been started in order to verify competence of COM/Metrosert (Estonia) in calibration of cylindrical diameter standards.
Final Report 2004-09-30
A comparison has been carried out in order to verify competence of COM/Metrosert (Estonia) in calibration of cylindrical diameter standards. The initiative was made by Estonian national measurement institute COM in the frame of the PHARE project ES9903.01. Comparison is conducted in accordance with the CIPM Guidelines for key comparisons (Appendix F to the "Mutual recognition of national measurements standards and of measurement certificates issued by national metrology institutes" (MRA)).
The artefacts were a ring (nominal diameter 19.966 mm) and a plug (nominal diameter 50 mm). NMi VSL operated as the pilot laboratory of the comparison and established thereby an informal link to EUROMET LK-4.
The results are summarized in the table below. The normalised deviations (En) were calculated, none of the En values was found to be outside the expected range (ie. greater than unity).
| Lab. | Length artefact | ||
| position | Ring | Plug | |
| VSL | top | (19,996 05 ± 0,000 22) mm | (50,001 37 ± 0,000 25) mm |
| middle | (19,996 19 ± 0,000 22) mm | (50,001 44 ± 0,000 25) mm | |
| bottom | (19,996 23 ± 0,000 22) mm | (50,001 45 ± 0,000 25) mm | |
| COM | top | (19,996 60 ± 0,000 51) mm | (50,001 59 ± 0,000 42) mm |
| middle | (19,996 62 ± 0,000 50) mm | (50,001 67 ± 0,000 42) mm | |
| bottom | (19,996 59 ± 0,000 52) mm | (50,001 63 ± 0,000 42) mm | |