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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)
Chile, DICTUC S.A. (Laboratorio Custodio de Patrones Nacionales de Longitud, Pontificia Universidad Católica de Chile)
Linear dimensions ,
End Standard
:
125 mm to 500 mm
Length bar (long gauge block): central length L
Absolute expanded uncertainty
:
1.0E2 nm to 2.5E2 nm
Uncertainty table
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Q[81 nm, 0.46E-6L] L representing the length of gauge block in nm .
1-D horizontal comparator stylus, with gauge blocks substitution
Peer review by Carlos Colin, from Cenam (Oct. 2018)
Approved on 25 January 2022
Institute service identifier : BPL01-LN
CMC ID :
SIM-L-CL-00000NFG-1
France, LNE-LCM/Cnam (Conservatoire National des Arts et Métiers/Laboratoire Commun de Métrologie)
Radiations of the mise en pratique ,
Laser radiations
:
633 nm
Frequency stabilized laser: vacuum wavelength
Absolute expanded uncertainty
:
3 fm
Optical beat frequency
Service provided by the LNE-INM
Approved on 21 October 2001
Institute service identifier : LNE/3
CMC ID :
EURAMET-L-FR-00000LAC-2
Radiations of the mise en pratique ,
Laser radiations
:
633 nm
Frequency stabilized laser: vacuum wavelength
Absolute expanded uncertainty
:
4.0E-2 fm
Optical beat frequency
Service provided by the LNE-INM
Approved on 21 October 2001
Institute service identifier : LNE/1
CMC ID :
EURAMET-L-FR-00000LA8-2
Radiations of the mise en pratique ,
Laser radiations
:
474 THz
Frequency stabilized laser: absolute frequency
Absolute expanded uncertainty
:
2.4E1 kHz
Optical beat frequency
Service provided by the LNE-INM
Approved on 21 October 2001
Institute service identifier : LNE/1
CMC ID :
EURAMET-L-FR-00000LA9-2
Radiations of the mise en pratique ,
Laser radiations
:
563 THz
Frequency stabilized laser: absolute frequency
Absolute expanded uncertainty
:
8.0E-2 MHz
Optical beat frequency
Service provided by the LNE-INM
Approved on 21 October 2001
Institute service identifier : LNE/2
CMC ID :
EURAMET-L-FR-00000LAB-2
Radiations of the mise en pratique ,
Laser radiations
:
532 nm
Frequency stabilized laser: vacuum wavelength
Absolute expanded uncertainty
:
8.0E-2 fm
Optical beat frequency
Service provided by the LNE-INM
Approved on 21 October 2001
Institute service identifier : LNE/2
CMC ID :
EURAMET-L-FR-00000LAA-2
Mexico, CENAM (Centro Nacional de Metrologia)
| Matrix or material |
Analyte or component |
Dissemination range of measurement capability |
Range of certified values in reference materials |
| Copy number ratio in % |
Absolute expanded uncertainty in % |
Copy number ratio in |
|
| ground seed materials and grains of similar matrix complexit , in terms of protein, high starch and high oil content |
specified intact sequence fragments of a length up to 150 nucleotides in a single genomic DNA extract |
0.14 to 90 |
5.9E1 to 4 |
|
|
-
Mechanism for measurement service delivery :
Value assignment of client samples
-
Approved on
23 October 2019
-
Institute service identifier : Bio-001
-
CMC ID :
SIM-QM-MX-00000JYH-1
Items for disseminating ITS-90 and PLTS 2000 ,
Temperature
:
-80 °C to 10 °C
Resistance thermometer
Absolute expanded uncertainty
:
1.2E-2 °C
Industrial type
Comparison in bath (ethanol) : sheath dimensions, diameter 3 mm to 7 mm, length >= 20 cm
Hysteresis uncertainty for each IPRT must be added to the combined uncertainty quoted in the Calibration Report
Approved on 12 July 2007
Institute service identifier : CENAM/420-E014-010
CMC ID :
SIM-T-MX-00000AAP-1
Form ,
Roundness
:
2 µm to 300 µm
Flick standard
Absolute expanded uncertainty
:
2.0E2 nm to 2.4E3 nm
Q[197 nm, 8E-03 R] Where R is the roundness
Roundness measuring machine
ISO 12181
Diameter : up to 300 mm
Approved on 04 August 2020
CMC ID :
SIM-L-MX-00000AWD-2
Linear dimensions ,
Diameter
:
5 mm to 205 mm
Internal cylinder (ring)
Absolute expanded uncertainty
:
0.24 µm to 0.32 µm
Q[0.24 µm, 1e-6L] Where L is the internal diameter
1-D stylus comparator, gauge substitution
Maximal external size diameter : 300 mm
Approved on 04 August 2020
CMC ID :
SIM-L-MX-00000AVX-4
Radiations of the mise en pratique ,
Absolute frequency
:
474 THz
Frequency stabilized laser
Absolute expanded uncertainty
:
2.4E1 kHz
Optical beat frequency
Approved on 04 August 2020
CMC ID :
SIM-L-MX-00000AVJ-2
Linear dimensions ,
Face spacing
:
10 mm to 1500 mm
Step gauge
Absolute expanded uncertainty
:
0.25 µm to 0.58 µm
Q[0.25 µm, 0.35e-6 L] Where L is the face spacing
CMM, laser interferometer and gauge block
Material : Steel
Material : Ceramic
Approved on 01 April 2026
CMC ID :
SIM-L-MX-00000AVV-2
Items for disseminating ITS-90 and PLTS 2000 ,
Temperature
:
10 °C to 80 °C
Digital (resistance) thermometer
Absolute expanded uncertainty
:
1.0E-2 °C
Industrial type
Comparison in bath (water) : sheath dimensions, diameter 3 mm to 7 mm, length >= 15 cm
Hysteresis uncertainty for each IPRT must be added to the combined uncertainty quoted in the Calibration Report
Approved on 12 July 2007
Institute service identifier : CENAM/420-E014-013
CMC ID :
SIM-T-MX-00000AAT-1
Complex geometry ,
CMM artifacts
:
10 mm to 1100 mm
Ball bar: ball spacing L
Absolute expanded uncertainty
0.4 + 0.6E-03L L in mm, values range from 0.41 µm to 1.1 µm.
The uncertainty is expressed in µm
CMM and stylus, with gauge substitution
Approved on 04 August 2020
Institute service identifier : CENAM/36
CMC ID :
SIM-L-MX-00000AW9-1
Linear dimensions ,
Central length
:
0.5 mm to 500 mm
Gauge block
Absolute expanded uncertainty
:
2.5E1 nm to 2.8E2 nm
Q[25 nm, 0.56e-6L] Where L is the length of the gauge block
Mechanical comparison to gauge block
ISO 3650:1998(E)
Material : Steel
Approved on 27 September 2025
CMC ID :
SIM-L-MX-00000AVT-2
Linear dimensions ,
Central length
:
0.5 mm to 100 mm
Gauge block
Absolute expanded uncertainty
:
1.9E1 nm to 4.9E1 nm
Q[19 nm, 0.45e-6L] Where L is the length of the gauge block
Interferometry exact fractions
ISO 3650:1998(E)
Material : Steel
Approved on 04 August 2020
CMC ID :
SIM-L-MX-00000AVL-2
Linear dimensions ,
Diameter
:
10 mm to 65 mm
Ball or sphere
Absolute expanded uncertainty
:
0.24 µm to 0.27 µm
Q[0.24 µm, 2e-6L] Where L is the diameter
1-D stylus comparator, gauge substitution
Approved on 04 August 2020
CMC ID :
SIM-L-MX-00000AVZ-2
Items for disseminating ITS-90 and PLTS 2000 ,
Temperature
:
-80 °C to 10 °C
Digital (resistance) thermometer
Absolute expanded uncertainty
:
1.2E-2 °C
Industrial type
Comparison in bath (ethanol) : sheath dimensions, diameter 3 mm to 7 mm, length >= 20 cm
Hysteresis uncertainty for each IPRT must be added to the combined uncertainty quoted in the Calibration Report
Approved on 12 July 2007
Institute service identifier : CENAM/420-E014-013
CMC ID :
SIM-T-MX-00000AAS-1
Fibre optics ,
Length
:
1 km to 15 km
Single-mode optical fibre
Absolute expanded uncertainty
:
0.1 m
Phase shift method
Wavelength : 1310 nm, 1550 nm, 1625 nm
Index of refraction : 1.4600
Approved on 29 June 2010
CMC ID :
SIM-PR-MX-00000GEK-2
Form ,
Roundness
:
0 µm to 5 µm
External cylinder (plug)
Absolute expanded uncertainty
:
2.2E1 nm to 5.4E1 nm
Q[21.5 nm, 10e-03R] Where R is the roundness
Roundness measuring machine
ISO 12181
Height : up to 500 mm
Approved on 04 August 2020
CMC ID :
SIM-L-MX-00000AWF-2
