Length Bar
Use the Length Bar area on the Calibration tab to define the configuration data found on your calibration certificate.
This shows a sample certificate of calibration for the length bar and how to locate the configuration data from the certificate.
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Length Bar CTE [mm/°C] - Locate the length bar's measurement's coefficient of thermal expansion (CTE) and type the calculated value in millimeters.
Suppose your certificate states a "...coefficient of linear expansion of 10.67 parts / million / °C."
In that case, your CTE is 10.67/1000000 = 0.00001067
The value you would type is 0.00001067 mm.
Calibrated Length Bar Size [mm] - Locate the nominal length with the stated deviations. If multiple deviations were found, calculate the average. Type the final value in millimeters.
Suppose your certificate states a nominal length of 300 mm and has five measured points with deviations of -2.08, -2.09, -2.18, -2.05, -2.20 microns.
The average of those values is -2.08 + -2.09 + -2.18 + -2.05 + -2.20 / 5 = -2.12 microns.
-2.12 microns is -.00212 mm.
300 mm + (- .00212 mm) = 299.99788 mm
The value you would type is 299.99788 mm.
Important
This is an additive calculation, but you must mind the sign of the deviation average value.
Uncertainty [mm] - Locate the uncertainty of measurement and type that value as millimeters.
Suppose the certificate states that the uncertainty over 100 mm is plus or minus 0.2 microns.
0.2 microns is 0.0002 mm.
The value you would type is 0.0002 mm.
Additional Factor / Metre [mm] - Locate the uncertainty of measurement for above 100 mm and calculate it across the nominal length. Type that value as millimeters.
Suppose the certificate states a 300 mm nominal length and has a phrase that says, "Over 100 mm: ± 0.2 + (1 x L in m) µm".
In this case, the additional factor is (1 x L in m) µm.
1 x 0.3 = 0.3 µm
0.3 µm is .0003 mm.
The value you would type is 0.0003 mm.
Example Values from Above Certificate
