| Metrology area, Sub-field | Length, Dimensional Metrology |
| Description | Calibration of diameter standards |
| Time of measurements | 2015 - 2017 |
| Status | Report in progress, draft B |
| References | |
| Measurand | Diameter in nm Nominal diameters are (in mm): 5.25, 25.32, 25.4, 90, 5, 23.81, 50, 7.94, 20, 25.4. |
| Parameters | Internal and external diameters as primary parameters Roundness and straightness as secondary parameters |
| Transfer device | Four ring gauges : from 5.25 mm to 90 mm diameter; Two cylinders: 5.0 mm and 23.81 mm diameter; One 50 mm diameter plug gauge; Tthree spheres of diameter: from7.94 mm to 25.4 mm. |
| Comparison type | Key Comparison |
| Consultative Committee | CCL (Consultative Committee for Length ) |
| Conducted by | CCL (Consultative Committee for Length ) |
| Pilot institute |
NIST
National Institute of Standards and Technology United States |
| Contact person | J. Stoup +1 301 975 3471 |
| Pilot laboratory | |
|---|---|
| NIST |
National Institute of Standards and Technology, United States, SIM |
| CEM |
Centro Español de Metrologia, Spain, EURAMET |
| CENAM |
Centro Nacional de Metrologia, Mexico, SIM |
| CMS/ITRI |
Industrial Technology Research Institute/Center for Measurement Standards, Chinese Taipei, APMP |
| INMETRO |
Instituto Nacional de Metrologia, Qualidade e Tecnologia, Brazil, SIM |
| INRIM |
Istituto Nazionale di Ricerca Metrologica, Italy, EURAMET |
| METAS |
Federal Institute of Metrology, Switzerland, EURAMET |
| NIM |
National Institute of Metrology, China, APMP |
| NIMT |
National Institute of Metrology (Thailand), Thailand, APMP |
| NMISA |
National Metrology Institute of South Africa, South Africa, AFRIMETS |
| VNIIM |
D.I. Mendeleyev Institute for Metrology, Rosstandart, Russian Federation, COOMET |
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