Sphere
This shows a sample certificate of calibration for the sphere and how to locate the configuration data from the certificate.
Sphere CTE [mm/°C] - Locate the sphere measurement's coefficient of thermal expansion (CTE) and type the calculated value in millimeters. Normally, the certificate states the CTE. In some cases, however, the certificate only lists the material type. In these cases, you need to look up the CTE for that type of material.
Suppose your certificate lists the material as "Ceramic AL203".
Ceramic AL203 has a CTE of 8 parts per million per °C.
8/1000000 = 0.000008 mm
The value you would type is 0.000008 mm.
Calibrated Sphere Diameter [mm] - Locate the sphere's measured diameter and type its value in millimeters.
Suppose your certificate lists the measured diameter or "Corrected diameter" as 24.97295 mm.
The value you would type is 24.97295 mm.
Uncertainty [mm] (for diameter) - Locate the measurement uncertainty for the diameter and type its value in millimeters.
Suppose your certificate lists the "Uncertainty of Measurement" as "± 0.00025 mm".
The value you would type is 0.00025 mm.
Calibrated Sphere Roundness [mm] - Locate the sphere's measured roundness and type its value in millimeters.
Suppose your certificate shows a Roundness of 0.04 µm.
0.04 µm is 0.00004 mm.
The value you would type is 0.00004 mm.
Uncertainty [mm] (for roundness) - Locate the measurement uncertainty for the roundness and type its value in millimeters.
Suppose your certificate lists the "Roundness Uncertainty" as "± 0.025 µm".
0.025/1000 = 0.000025 mm
The value you would type is 0.000025 mm.
Example Values from Above Certificate
