Zeiss CenterMax Operating Instructions Manual page 120

Measuring operation
Standard deviation
7-20
certain bending of the probe. Tensor calibration makes it possible to
correct the bending for subsequent probings.
Tensor calibration must be carried out by means of vectors. The probe
can be moved in all axes.
1 Insert the probe into the adapter plate receptacle
2 Open the menu for calibration
measuring software.
3 Select the clamping status of the axes, i.e. clamped or unclamped.
The same axis clamping status must be set as will be required later
on for workpiece measurement to prevent measuring errors.
Axis clamping must be performed via the control panel.
4 Probe system specific actions:
• The measuring force must be set for the VAST probe system.
5 Select the stylus to be calibrated on the control panel.
2
4
5
1
6 Call the menu for calibration in the measuring software and probe
the calibration sphere
software.
The calibration sphere diameter is output as the result.
7 Check the result.
The result is evaluated based on the standard deviation. There is no
maximum standard deviation which applies to all applications. The
tolerable deviation depends on many factors: e.g. resolution and
precision of the CMM, length and rigidity of the probe shaft, qual-
ity of the probe tip, cleanness of the environment. Normally, the
standard deviation should be within a range of a few micrometers
(e.g. 0.002).
If the result is not satisfactory, repeat the calibration or look for
plausible causes. It might be necessary to decide whether or not to
accept measuring inaccuracies.
8 Repeat points 2 to 6 for all other styli of the probe.
61211-1020202 CenterMax Operating Instructions
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operating instructions for the
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Operating instructions for the measuring
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page 6-16.