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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Length for United Kingdom (.PDF file)
Length instruments. Laser interferometer: displacement L, 0 m to 45 m
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in µm: Q[0.08, 0.12L], L in m
Comparison of two interferometers
Approved on 08 October 2012
Internal NMI service identifier: 7
 
Length instruments. Laser interferometer: displacement and wavelength compensation, 0 m to 45 m
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in µm: Q[0.08, 0.2L], L length in m
Comparison of two interferometers
Relative humidity: (50 ± 10) %
Temperature: 15 °C to 25 °C
Pressure: 900 hPa to 1050 hPa
Approved on 08 October 2012
Internal NMI service identifier: 8