BYK-Gardner GmbH Appendix | 6
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6 Appendix
6.1 Cleaning and Maintenance
6.1.1 Cleaning the Test Tile
Since the surface of the test tile is highly sensitive, cleaning must be undertaken
with great care.
To clean standards, use a new lint-free cloth, dust-free lens paper or an optical
cloth as included with the device.
Apply only slight pressure when cleaning, and ensure the cloth is free of dust or
other particles that could damage the surface.
For dirt that is difficult to remove, use a pre-moistened optical cloth. Then wipe
the surface with a dry optical cloth.
An exact verification is not possible unless the test tile is in perfect condition. If the
condition of the test tile seems doubtful because of its appearance or measure-
ment errors, have it checked by the manufacturer.
6.1.2 Usage of Reference Tile
To ensure a precise instrument test, only original test tiles from the manufacturer
should be used. Their surface must not be touched and must be protected against
scratches.
Due to environmental influences, however, the values of test tiles can change over
the course of time even if they are handled gently.
For this reason, have the test tiles checked by the manufacturer at regular intervals
(annual checks are recommended).
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