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CMCs General Physics (45)
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Dimensional metrology (45)
End standards (10)
Line standards (7)
Flatness standards (5)
Diameter standards (5)
Surface texture (4)
Gear standards (4)
Roundness standards (3)
Angle by circle dividers (2)
Length instruments (2)
Angle artifacts (1)
Angle instruments (1)
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EURAMET (45)
United Kingdom (45)
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United Kingdom, NPL (National Physical Laboratory)
Complete CMCs in Length for United Kingdom (.PDF file)
End standards. Long gauge block: central length L, 100 mm to 1000 mm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: (120 + 0.26L), L in mm
Interferometric mechanical comparator
Internal NMI service identifier: 12
 
End standards. Long gauge block: central length L, 100 mm to 1000 mm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: Q[49, 0.083L], L in mm
Absolute interferometry exact fractions
Internal NMI service identifier: 13
 
End standards. Length bar: central length L, 100 mm to 1270 mm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: (120 + 0.26L), L in mm
Interferometric mechanical comparator
Internal NMI service identifier: 15
 
End standards. Length bar: central length L, 100 mm to 1270 mm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: Q[49, 0.083L], L in mm
Absolute interferometry exact fractions
Internal NMI service identifier: 16
 
Line standards. Linear scale: line spacing L, 0.01 mm to 400 mm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in Ám: Q[0.159 + 0.00182L], L in mm
Interferometer
Revised on 05 May 2017
Internal NMI service identifier: 20
 
Line standards. Grid plate (XY standard): grid point coordinates, 50 mm to 120 mm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in Ám: 0.1
2-D comparator + interferometer
Internal NMI service identifier: 22
 
Line standards. 1-D grating: pitch, P, 0.29 Ám to 50 Ám
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: Q[0.025, 0.19P, 0.024P 2], P in Ám, values range from 0.06 to 61
Laser diffractometer
Measurement area: 3 mm2
Internal NMI service identifier: 23
 
Line standards. 2-D grating: pitch, P, 0.29 Ám to 50 Ám
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: Q[0.025, 0.19P, 0.024P 2], P in Ám, values range from 0.06 to 61
Laser diffractometer
Measurement area: 3 mm2
Internal NMI service identifier: 24
 
Line standards. Photomask: linewidth L, 0.3 Ám to 200 Ám
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in Ám: (0.03 + 0.001L), L in Ám
Optical microscope + interferometer
Internal NMI service identifier: 25
 
Diameter standards. Thread measuring cylinder: diameter, D, 0.05 mm to 5 mm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in Ám: (0.08 + 0.001D), D in mm
Mechanical probe with capacitive sensing
Internal NMI service identifier: 27
 
Diameter standards. Internal cylinder (plain ring gauge): diameter, D, 3 mm to 250 mm
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in Ám: (0.07 + 0.0005D), D in mm
Mechanical probe with interferometric sensing
Internal NMI service identifier: 30
 
Angle by circle dividers. Optical polygon: face angle, 0 ░ to 360 ░
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ": 0.11
Back to back calibration
Faces: up to 12 excluding 7 and 11
Approved on 30 January 2009
Internal NMI service identifier: 31
 
Angle by circle dividers. Indexing table: index angle, 0 ░ to 360 ░
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ": 0.04
Back to back calibration
Interval: 30 ░
Approved on 30 January 2009
Internal NMI service identifier: 32
 
Angle instruments. Autocollimator: angle, 0 ' to 10 '
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ": 0.06
Sine arm
Approved on 30 January 2009
Internal NMI service identifier: 33
 
Angle artifacts. Angle block (combination): included angle, 0 ░ to 90 ░
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in ": 0.3
Moore table and sine arm
Internal NMI service identifier: 34
 
Flatness standards. Optical flat: flatness, 0 Ám to 18.99 Ám
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 20
Phase-stepping Fizeau interferometer, automatic assessment
Diameter: 100 mm to 150 mm
Orientation: vertical
Approved on 17 July 2014
Internal NMI service identifier: 35a
 
Flatness standards. Optical flat: flatness, 0 Ám to 18.99 Ám
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 17
Phase-stepping Fizeau interferometer, automatic assessment
Diameter: 33 mm to 100 mm
Orientation: vertical
Approved on 17 July 2014
Internal NMI service identifier: 35b
 
Flatness standards. Optical flat: flatness, 0 Ám to 18.99 Ám
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 14
Phase-stepping Fizeau interferometer, automatic assessment
Diameter: 3 mm to 33 mm
Orientation: vertical
Approved on 17 July 2014
Internal NMI service identifier: 35c
 
Flatness standards. Optical flat: flatness, 0 Ám to 16.29 Ám
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 27
Fizeau interferometer, visual assessment
Diameter: 100 mm to 300 mm
Orientation: horizontal
Internal NMI service identifier: 36
 
Flatness standards. Optical flat: flatness, 0 Ám to 16.29 Ám
Absolute expanded uncertainty (k = 2, level of confidence 95 %) in nm: 12
Fizeau interferometer, automatic assessment
Diameter: 100 mm to 300 mm
Orientation: horizontal
Internal NMI service identifier: 37