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Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Length for Mexico (.PDF file)
Laser radiations. Stabilized laser of the mise en pratique: absolute frequency, 474 THz
Absolute expanded uncertainty (k = 2, level of confidence 95%) in kHz: 24
Optical beat frequency
Internal NMI service identifier: CENAM/1
 
Laser radiations. Other stabilized laser: vacuum wavelength , 633 nm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: 2E-09
Optical beat frequency
Internal NMI service identifier: CENAM/2
 
End standards. Gauge block: central length L, 0.5 mm to 100 mm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[19, 0.45L], L in mm, values range from 19 nm to 49 nm
Interferometry, exact fractions
Material: steel
Internal NMI service identifier: CENAM/8
 
End standards. Gauge block: central length L, 0.5 mm to 100 mm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[24, 0.42L], L in mm, values range from 24 nm to 49 nm
Interferometry, exact fractions
Material: ceramic
Internal NMI service identifier: CENAM/8
 
End standards. Gauge block: central length L, 0.5 mm to 100 mm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[28, 0.33L], L in mm, values range from 28 nm to 44 nm
Interferometry, exact fractions
Material: tungsten carbide
Internal NMI service identifier: CENAM/8
 
End standards. Gauge block: central length L, 0.5 mm to 100 mm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[28, 0.39L], L in mm, values range from 28 nm to 48 nm
Interferometry, exact fractions
Material: chrome carbide
Internal NMI service identifier: CENAM/8
 
End standards. Length bar (long gauge block): central length L, 100 mm to 300 mm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[19, 0.45L], L in mm, values range from 49 nm to 137 nm
Interferometry, exact fractions
Material: steel
Internal NMI service identifier: CENAM/8b
 
End standards. Length bar (long gauge block): central length L, 100 mm to 300 mm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[24, 0.42L], L in mm, values range from 49 nm to 129 nm
Interferometry, exact fractions
Material: ceramic
Internal NMI service identifier: CENAM/8b
 
End standards. Length bar (long gauge block): central length L, 100 mm to 300 mm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[28, 0.33L], L in mm, values range from 44 nm to 103 nm
Interferometry, exact fractions
Material: tungsten carbide
Internal NMI service identifier: CENAM/8b
 
End standards. Length bar (long gauge block): central length L, 100 mm to 300 mm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[28, 0.39L], L in mm, values range from 48 nm to 121 nm
Interferometry, exact fractions
Material: chrome carbide
Internal NMI service identifier: CENAM/8b
 
End standards. Gauge block: central length L, 0.5 mm to 100 mm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: Q[29, 0.94L], L in mm, values range from 29 nm to 99 nm
Mechanical comparison to gauge block
Material: steel
Internal NMI service identifier: CENAM/9
 
End standards. Length bar (long gauge block): central length L, 0.125 m to 0.25 m
Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.18 + 0.7L), L in m, values range from 0.27 µm to 0.36 µm
1-D stylus comparator, gauge substitution
Internal NMI service identifier: CENAM/10
 
End standards. Step gauge: face spacing L, 0.02 m to 1.2 m
Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.35 + 0.4L)
CMM and laser interferometer
Approved on 14 June 2004
Internal NMI service identifier: CENAM/13
 
Diameter standards. External cylinder (plug): diameter, L, 0.005 m to 0.3 m
Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.18 + 0.4L)
1-D stylus comparator, gauge substitution
Approved on 14 June 2004
Internal NMI service identifier: CENAM/16
 
Diameter standards. Internal cylinder (ring): diameter L, 0.005 m to 0.205 m
Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.18 + 0.4L)
1-D stylus comparator, gauge substitution
Maximal external size diameter: 300 mm
Approved on 14 June 2004
Internal NMI service identifier: CENAM/17
 
Diameter standards. External cylinder (pin or wire): diameter L, 0.1 mm to 5 mm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.25 + 0.001L)
1-D stylus comparator, gauge substitution
Approved on 14 June 2004
Internal NMI service identifier: CENAM/18
 
Diameter standards. Ball or sphere: diameter L, 0.005 m to 0.065 m
Absolute expanded uncertainty (k = 2, level of confidence 95%) in µm: (0.18 + 0.4L)
1-D stylus comparator, gauge substitution
Approved on 14 June 2004
Internal NMI service identifier: CENAM/19
 
Angle artefacts. Angle block: included angle, 1 ° (or ', or ") to 45 ° (or ', or ")
Absolute expanded uncertainty (k = 2, level of confidence 95%) in ": 0.3
Index table and autocollimator, full closure
Specific angle sizes: 1, 2, 3, 5, 10, 15, 20, 30, 45 in °, or ', or "
Approved on 14 June 2004
Internal NMI service identifier: CENAM/28
 
Surface texture. Groove or step-height standard: step height, H, 0.03 µm to 10 µm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: (15 + 2.7H), H in µm, ranges from 15 nm to 42 nm
2-D profile stylus instrument
Approved on 14 June 2004
Internal NMI service identifier: CENAM/32
 
Surface texture. Roughness standard: roughness parameter, 0.01 µm to 20 µm
Absolute expanded uncertainty (k = 2, level of confidence 95%) in nm: (10 + 18P), P in µm, ranges from 10 nm to 370 nm
2-D profile stylus instrument
Roughness parameter P: Ra, Rz, Rmax
Approved on 14 June 2004
Internal NMI service identifier: CENAM/33