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Mexico, CENAM (Centro Nacional de Metrologia)
Complete CMCs in Mass and related quantities for Mexico (.PDF file)
Density of solid. Volume of mass standard 20 g, 2.334 cm3 to 2.667 cm3
Absolute expanded uncertainty (k = 2, level of confidence 95%) in cm3: 0.002
Hydrostatic weighing
Liquid temperature: 20 °C
Air temperature: 20 °C
Humidity: 40% to 60%
Volume values corresponding to densities of weights class E1 and E2
Internal NMI service identifier: CENAM/730-F007-C086
 
Density of solid. Volume of mass standard 50 g, 6.039 cm3 to 6.460 cm3
Absolute expanded uncertainty (k = 2, level of confidence 95%) in cm3: 0.002
Hydrostatic weighing
Liquid temperature: 20 °C
Air temperature: 20 °C
Humidity: 40% to 60%
Volume values corresponding to densities of weights class E1 and E2
Internal NMI service identifier: CENAM/730-F007-C086
 
Density of solid. Volume of mass standard 100 g, 12.180 cm3 to 12.804 cm3
Absolute expanded uncertainty (k = 2, level of confidence 95%) in cm3: 0.002
Hydrostatic weighing
Liquid temperature: 20 °C
Air temperature: 20 °C
Humidity: 40% to 60%
Volume values corresponding to densities of weights class E1 and E2
Internal NMI service identifier: CENAM/730-F007-C086
 
Density of solid. Volume of mass standard 200 g, 24.361 cm3 to 25.608 cm3
Absolute expanded uncertainty (k = 2, level of confidence 95%) in cm3: 0.002
Hydrostatic weighing
Liquid temperature: 20 °C
Air temperature: 20 °C
Humidity: 40% to 60%
Volume values corresponding to densities of weights class E1 and E2
Internal NMI service identifier: CENAM/730-F007-C086
 
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