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CIPM MRA PARTICIPANTS
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CIPM MRA PARTICIPANTS
CMC statistics
Results for: Length
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General physics
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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)
Linear dimensions , End standards : 0.5 mm to 100 mm
Gauge block: central length, L
Absolute expanded uncertainty : 2.1E1 nm to 5.5E1 nm
Q[21 nm, 0.51E-06L] L in mm, values range from 21 nm to 55 nm
The uncertainty is expressed in nm
Interferometry exact fractions
Approved on 15 May 2025
Institute service identifier : INTI/102.01.04.05.00.002
CMC ID : SIM-L-AR-00000AYL-2
 
Linear dimensions , End standards : 100 mm to 300 mm
Length bar (long gauge block): central length L
Absolute expanded uncertainty : 5.5E1 nm to 1.5E2 nm
Q[21nm, 0.51E-06L] L in mm, values range from 55 nm to 154 nm
The uncertainty is expressed in nm
Interferometry. Exact fractions
Approved on 15 May 2025
Institute service identifier : INTI/102.01.04.05.00.002
CMC ID : SIM-L-AR-00000AYM-2
 
Linear dimensions , Precision line scale: line spacing L : 0 mm to 300 mm
CMM, laser, camera and optical microsocope
Absolute expanded uncertainty : 1.4E2 nm to 3.4E2 nm
Q[144;1.01L] L in mm, uncertainty in nm
CMM, laser, camera and optical microsocope
Approved on 09 May 2022
CMC ID : SIM-L-AR-00000NDB-1
 
Linear dimensions , Diameter standards : 3 mm to 100 mm
Internal cylinder (ring): diameter L
Absolute expanded uncertainty : 1.4E2 nm to 1.9E2 nm
Q[139 nm, 1.26E-6L] L in mm
The uncertainty is expressed in nm
CMM, laser and gauge block
Approved on 21 May 2025
Institute service identifier : INTI/15.04.01.05.00.041
CMC ID : SIM-L-AR-00000AYS-2
 
Linear dimensions , Diameter standards : 100 mm to 250 mm
Internal cylinder (ring): diameter L
Absolute expanded uncertainty : 2.8E2 nm to 3.6E2 nm
Q[260 nm, 1.0E-6L] L in mm
The uncertainty is expressed in nm
CMM, laser and gauge block
Approved on 26 April 2025
Institute service identifier : INTI/15.04.01.05.00.041
CMC ID : SIM-L-AR-00000ND5-2
 
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
CMC ID : SIM-L-AR-00000AYO-1
 
Linear dimensions , Diameter standards : 100 mm to 250 mm
External cylinder (plug): diameter L
Absolute expanded uncertainty : 0.28 µm to 0.36 µm
Q[0.26, 0.0010L] L in mm
The uncertainty is expressed in µm
CMM, laser and gauge block
Approved on 27 April 2022
Institute service identifier : INTI/15.04.01.05.00.041
CMC ID : SIM-L-AR-00000ND4-1
 
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 11 April 2022
Institute service identifier : INTI/102.05.02.05.00.004
CMC ID : SIM-L-AR-00000AYW-2
 
Angle , Angle by circle dividers : 15 ° to 120 °
Index table: index angle
Absolute expanded uncertainty : 0.15 "
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 26 April 2025
Institute service identifier : 106300205120078
CMC ID : SIM-L-AR-00000AYT-5
 
Angle , Angle artifacts : 0 ° to 90 °
Angle block: included angle
Absolute expanded uncertainty : 0.3 "
Index table and autocollimator
Approved on 26 April 2025
Institute service identifier : INTI/15.04.01.05.00.042
CMC ID : SIM-L-AR-00000AYV-2
 
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
CMC ID : SIM-L-AR-00000AYP-1
 
Linear dimensions , Diameter standards : 3 mm to 100 mm
External cylinder (plug): diameter L
Absolute expanded uncertainty : 1.4E2 nm to 1.9E2 nm
Q[139, 1.26L] L in mm
The uncertainty is expressed in nm
CMM, laser and gauge block
Approved on 27 April 2022
Institute service identifier : INTI/15.04.01.05.00.041
CMC ID : SIM-L-AR-00000AYR-2
 
Linear dimensions , End standards : 0.5 mm to 100 mm
Gauge block: central length, L
Absolute expanded uncertainty : 4.0E1 nm to 1.0E2 nm
Q[40, 92L] L in mm, values range from 40 nm to 100 nm
The uncertainty is expressed in nm
Mechanical comparison to gauge block
Approved on 09 May 2022
CMC ID : SIM-L-AR-00000AYN-2
 
Angle , Angle by circle dividers : 15 ° to 120 °
Optical polygon: face angle
Absolute expanded uncertainty : 0.15 "
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 26 April 2025
Institute service identifier : 106300205120078
CMC ID : SIM-L-AR-00000AYU-3
 
Australia, NMIA (National Measurement Institute, Australia)
Linear dimensions , Diameter standards : 1 mm to 200 mm
External cylinder: diameter D
Absolute expanded uncertainty : 9.0E1 nm to 2.8E2 nm
Q[90 nm,1.3E-6D] D representing diameter
1-D comparator and laser interferometer
Approved on 02 January 2019
Institute service identifier : 1.08.02
CMC ID : APMP-L-AU-00000CTJ-2
 
Angle , Angle artifacts : 0 ° to 180 °
Angle block: included angle
Absolute expanded uncertainty : 0.3 arcsecond
Autocollimator and indexing table
Approved on 02 January 2019
Institute service identifier : 1.08.01b
CMC ID : APMP-L-AU-00000CTO-2
 
Angle , Angle instruments : 0 arcsecond to 1000 arcsecond
Autocollimator: error of indicated angle
Absolute expanded uncertainty : 0.15 arcsecond
sine table and digital scale
Approved on 02 January 2019
Institute service identifier : 1.09.01
CMC ID : APMP-L-AU-00000CTN-2
 
Form , Roundness standards : 0 µm to 40 µm
Internal cylinder: roundness
Absolute expanded uncertainty : 2.1E1 nm to 3.9E2 nm
Q[21 nm, 9.8E-3R] R representing roundness
Roundness measuring machine
Diameter, d : 2 < d < 400 mm
Approved on 02 January 2019
Institute service identifier : 1.05.02b
CMC ID : APMP-L-AU-00000CTS-2
 
Various dimensional , Hand Instruments : 0 mm to 25.4 mm
Micrometer head
Absolute expanded uncertainty : 0.3 µm
Error of indicated displacement
Resolution : 0.1 µm
Approved on 02 January 2019
Institute service identifier : 1.03.21
CMC ID : APMP-L-AU-00000CT8-2
 
Linear dimensions , Length instruments : 0 m to 20 m
Laser interferometer: error of indicated displacement
Absolute expanded uncertainty : 4.0E1 nm to 2.4E2 nm
Q[40 nm, 12E-9L] L representing displacement
Comparison with laser interferometer using common beam paths
Approved on 02 January 2019
Institute service identifier : 1.09.08
CMC ID : APMP-L-AU-00000CTA-2
 

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This metrology area covers the fields of DC and AC measurements, impedance, electric and magnetic fields, radiofrequencies and measurements on materials.

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This metrology area covers the fields of laser frequencies and dimensional metrology.

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