USTER HVI1000, Инструкция по эксплуатации, Страница: 189 / 238

USTER®
HVI 1000
Instruction Manual
Uster Technologies, Inc. Chapter 10
(3/08) Maintenance
-
Page 10-3
4 Calibration Tiles
The calibration tiles are the reference for all color and trash
measurements on the colorimeter. When calibration tiles are not
maintained in good, clean condition, they can affect system calibration.
Proper calibration is essential to produce accurate testing results. Often,
when a significant drift of Rd or +b is noted while testing, calibration tile
condition is responsible.
Uster recommends that users follow the guidelines below.
•
The tile set assigned with the unit should STAY with the unit. The
tile set will normally maintain its calibration value throughout the
life of the instrument. It is recommended that each set be checked
against a master tile set every two to three years. This is to allow
re-adjustment in the unlikely event that the Rd or +b values
change or shift.
These small shifts are usually minimal when
compared to a shift in color grade.
•
Never try to use a tile set other than the one assigned to the unit.
Due to technology changes there are important differences in
colorimeters that require different levels when the calibration tiles
are assigned.
•
Always store tiles in the container they are shipped in. These
boxes are manufactured solely for tile storage and are designed
to keep the tiles in a clean and dust free environment.
•
If a tile is broken or becomes cracked the entire box should be
returned to USTER for repair or replacement. During
repair/replacement, the entire tile set will be evaluated and
values re-assigned if necessary.
•
Only calibrate with the tiles (supplied with the unit) as prescribed
by the calibration section of the instruction manual.
•
Always check the tile set for fingerprints or soil spots before
calibrating a colorimeter. Fingerprints, though not very
noticeable can cause a calibration level shift of up to 0.4 RD or
+b. Even though the colorimeter may calibrate under these
conditions, the cotton testing results will not be accurate.