Seli STS-15, Руководство пользователя

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Table of contents
2.4 Checking and calibration
For checking and calibration of the STS15 sensor, reference
normals
(RFS-T15) with varying reflection values are available. As
necessary, they can be plugged onto the sensor.
It has to be ensured that the reference normal is precisely applied
at the sensor and that the marking (arrow) of the standard points
to the M12 connector of the sensor.
Fig. 4: Reference normal (RFS-T15) with marking