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In the CMCs uncertainty statements, the notation Q[a, b] stands for the root-sum-square of the terms between brackets: Q[a, b] = [a 2 + b 2]1/2
Unless otherwise stated the expanded uncertainties given below correspond to k = 2 (at a 95 % level of confidence)
Argentina, INTI (Instituto Nacional de Tecnologia Industrial)
Angle , Angle by circle dividers : 15 ° to 120 °
Index table: index angle
Absolute expanded uncertainty : 0.2 "
Index table and autocollimator, full closure
Measured angle: 360/n º, number of divisions n : 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20 and 24
Approved on 27 November 2012
Institute service identifier : INTI/15.04.01.05.00.044
Radiations of the mise en pratique , Laser radiations : 633 nm
Frequency stabilized laser: vacuum wavelength
Relative expanded uncertainty : 2.0E-9
Optical beat frequency
Approved on 30 August 2015
Institute service identifier : INTI/102.05.02.05.00.004
Linear dimensions , End standards : 100 mm to 300 mm
Length bar (long gauge block): central length L
Absolute expanded uncertainty
Q[21, 0.51L]

L in mm, values range from 55 nm to 154 nm

The uncertainty is expressed in nm

Interferometry. Exact fractions
Approved on 30 August 2015
Institute service identifier : INTI/102.01.04.05.00.002
Complex geometry , Surface texture standards : 0.03 µm to 20 µm
Roughness standard: roughness parameters, P
Absolute expanded uncertainty
8 + 26P

P in µm, values range from 9 nm to 528 nm

The uncertainty is expressed in nm

2-D profile stylus instrument
Roughness parameter, P : Ra, Rz, Rmax according to ISO 4287
Approved on 27 November 2012
Institute service identifier : INTI/102.04.05.01.00.004
Complex geometry , Surface texture standards : 0.03 µm to 10 µm
Grove or step-height standard: step heigth, H
Absolute expanded uncertainty
20 + 12H

H in µm, values range from 20 nm to 140 nm

The uncertainty is expressed in nm

2-D profile stylus instrument
Approved on 27 November 2012
Institute service identifier : INTI/102.04.05.01.00.004
Linear dimensions , End standards : 0.5 mm to 100 mm
Gauge block: central length, L
Absolute expanded uncertainty
Q[21, 0.51L]

L in mm, values range from 21 nm to 55 nm

The uncertainty is expressed in nm

Interferometry exact fractions
Approved on 27 November 2012
Institute service identifier : INTI/102.01.04.05.00.002
Linear dimensions , Diameter standards : 3 mm to 250 mm
External cylinder (plug): diameter L
Absolute expanded uncertainty
Q[0.26, 0.0010L]

L in mm

The uncertainty is expressed in µm

CMM, laser and gauge block
Approved on 27 November 2012
Institute service identifier : INTI/15.04.01.05.00.041
Angle , Angle artifacts : 0 ° to 90 °
Angle block: included angle
Absolute expanded uncertainty : 0.4 "
Index table and autocollimator
Approved on 27 November 2012
Institute service identifier : INTI/15.04.01.05.00.042
Linear dimensions , End standards : 125 mm to 1000 mm
Length bar (long gauge block): central length L
Absolute expanded uncertainty
Q[150, 1.1L]

L in mm, values range from 203 nm to 1110 nm

The uncertainty is expressed in nm

1-D measuring machine, stylus, gauge blocks substitution and length interferometer
Approved on 27 November 2012
Institute service identifier : INTI/102.04.05.05.10.0001
Angle , Angle by circle dividers : 15 ° to 120 °
Optical polygon: face angle
Absolute expanded uncertainty : 0.2 "
Index table and autocollimator, full closure
Measured angle: 360/n º, number of faces n : 3, 4, 5, 6, 8, 9, 10, 12, 15, 16, 18, 20 and 24
Approved on 27 November 2012
Institute service identifier : INTI/15.04.01.05.00.043
Linear dimensions , Diameter standards : 3 mm to 250 mm
Internal cylinder (ring): diameter L
Absolute expanded uncertainty
Q[0.30, 0.0008L]

L in mm

The uncertainty is expressed in µm

CMM, laser and gauge block
Approved on 27 November 2012
Institute service identifier : INTI/15.04.01.05.00.041
Linear dimensions , End standards : 0.5 mm to 100 mm
Gauge block: central length, L
Absolute expanded uncertainty
Q[48, 1.44L]

L in mm, values range from 48 nm to 152 nm

The uncertainty is expressed in nm

Mechanical comparison to gauge block
Approved on 30 August 2015
Australia, NMIA (National Measurement Institute, Australia)
Form , Roundness standards : 0 µm to 40 µm
External cylinder: roundness
Absolute expanded uncertainty
Q[ 0.021,0.0098R ]

R roundness in µm

The uncertainty is expressed in µm

Roundness measuring machine
Diameter, d : 2 < d < 400 mm
Approved on 02 January 2019
Institute service identifier : 1.05.02a
Linear dimensions , End standards : 100 mm to 1300 mm
Length bars: central length L
Absolute expanded uncertainty
Q[ 94,1.02L ]

L central length in mm

The uncertainty is expressed in nm

Interferometer and mechanical comparison
Approved on 02 January 2019
Institute service identifier : 1.08.05
Linear dimensions , Length instruments : 0 m to 20 m
Laser interferometer: error of indicated displacement
Absolute expanded uncertainty
Q[ 40,12L ]

L displacement in m

The uncertainty is expressed in nm

Comparison with laser interferometer using common beam paths
Approved on 02 January 2019
Institute service identifier : 1.09.08
Form , Roundness standards : 0 µm to 2 µm
spheres and hemispheres: roundness
Absolute expanded uncertainty : 8 nm
Roundness measuring machine
Diameter, d : 2 < d < 400 mm
Approved on 02 January 2019
Institute service identifier : 1.05.03a
Angle , Angle by circle dividers : 0.25 ° to 360 °
Index table: index angle
Absolute expanded uncertainty : 5.0E-2 arcsecond
Autocollimator and cross calibration technique
Approved on 02 January 2019
Institute service identifier : 1.08.09
Angle , Angle by circle dividers : 5 ° to 120 °
Optical polygon: face angle
Absolute expanded uncertainty : 0.2 arcsecond
Autocollimator and indexing table
Number of faces, n : 3 < n < 72
Approved on 02 January 2019
Institute service identifier : 1.08.01a
Form , Flatness standards : 0 µm to 20 µm
Optical parallel: parallelism
Absolute expanded uncertainty : 3.2E-2 µm
1-D comparator
Diameter, d : 10 < d < 120 mm
Approved on 02 January 2019
Institute service identifier : 1.03.12
Complex geometry , Surface texture standards : 0.1 µm to 30 µm
Roughness standard (ISO 5436-1 type D): ISO roughness parameters Rz
Absolute expanded uncertainty
Q[ 5,17Rz ]

Rz in µm

The uncertainty is expressed in nm

2-D surface profilometer
Approved on 02 January 2019
Institute service identifier : 1.08.12d

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