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Calibration of (block) standards or tip gauges

Calibrating your measurement instruments enables connecting them to the international system of units, while ensuring the traceability of your measurement output. This approach serves to satisfy the requirements of your quality assurance protocol. The scope of our COFRAC accreditation equips us to determine the length of your standard reference blocks as well as other standards.

Proposed calibration services

Calibration of standard blocks with parallel flat tips (made of steel, ceramic or carbide) by means of direct interferometry, interferometric comparison or mechanical comparison, in accordance with Standard ISO 3650
 

  • Standard blocks ranging from 0.1 to 100 mm:

Measurements of length at the center and length variation.
Optimal measurement uncertainties:
(0.02 µm + 0.15.10-6.L) to (0.07 µm + 0.7.10-6.L) depending on the method used (k=2)
0.05 µm for the length variation (k=2).

  • Standard blocks ranging from 100 to 3,000 mm:

Length measurement at the center.
Optimal measurement uncertainty: (0.04 µm + 0.3.10-6.L) to (0.5 µm + 2.5.10-6.L) depending on the method used (k=2).

  • Standard block bridges:

Determination of length at the internal center.
Optimal measurement uncertainty: 0.04 µm (k=2).

  • IVC blocks used to verify the block comparator:

Measurements of length at the center, flatness of the surface and both transverse and longitudinal parallelism relative to the adhesion plane, measurement of length variation.

  • Standard pins with either spherical or flat tips

Length measurement by means of interferometric or mechanical comparison.
Measurement range: 10 to 4,000 mm.
Optimal measurement uncertainty: (0.4 µm + 0.6.10-6.L) to (1 µm + 2.5.10-6.L), depending on the method used (k=2).

  • Control gauges for a surface gauge, caliper and internal micrometer:

Measurement range: L  ≤ 800 mm
The gauge is calibrated in the horizontal position. Distances are recorded at the center of the surfaces using an oscillating spherical contact feeler referenced to a fringe-counting laser interferometer.
Optimal measurement uncertainty: 0.5 µm + 1.5 .10-6.L  (k=2).

Accreditation details

  • COFRAC Accreditation No. 2-35 (Paris site) and No. 2-1446 (Nîmes site)

List of sites and scopes available on www.cofrac.fr

Additional services

Depending on the instrument, possibility of establishing a verification certificate based on the relevant standard or client specifications.