Measurement uncertainty of spatial length “UL” is the deviation between a measured length and its nominal value. This measurement uncertainty is specified as a function of the shortest distance between the Laser Tracker and the measured length. The length can be up to 6m and is perpendicular positioned to the laser beam. The centers of two fix-mounted spheres (sphere radius between 15mm and 20mm) at the end of the reference length are representing the nominal distance. The measured distance between the sphere centers is calculated using scan data of all four Leica T-Scan sides.
Measurement uncertainty of sphere radius “UR” is the deviation between a measured sphere radius and its nominal value.
The measurement uncertainty of the sphere surface “US” is defined as the 2-sigma value of all deviation from the best-fit sphere that is calculated with all measured points. This specification assumes a reference sphere with a radius between 10mm and 50mm. These measurement uncertainties are specified as a function of the distance between the Laser Tracker and the sphere. Data of all four Leica T-Scan sides is utilized for the calculation of the sphere radius and the sphere surface.
Measurement uncertainty of plane surface “UP” is defined as the 2-sigma value of all deviation from the best-fit plane that is calculated with all measured points. Data from all four Leica T-Scan sides is utilized for the calculation of the plane surface.
Measurement uncertainty of spatial length
- UL = ± 60μm for <8.5m (± 0.00236in for <27.9ft)
- UL = ± 7μm/m for >8.5m (± 0.00008in/ft for >27.9ft)
Measurement uncertainty of sphere radius (2 Sigma)
- UR = ± 50μm for <8.5m (± 0.00236in for <27.9ft)
- UR = ± 7μm/m for >8.5m (± 0.00008in/ft for >27.9ft)
- US = ± 95μm + 1.5μm/m (±0.003740in + 0.00002in/ft)
Measurement uncertainty of plane surface (2 Sigma)
- UP = ± 95μm + 3μm/m (±0.003740in + 0.00004in/ft)
