4.4 Calibration station
4.4.1 Floor conditions
Deviations of up to 1% in a level surface can generally be tolerated.
4.4.2 Calibration environment
The calibration station should be free of draughts and interference from light sources, such as sunlight. Similarly,
geometric shapes in the colours black and white that correspond to the calibration symbol should be avoided
in the background of the board.
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