ALTANA Micro-TRI-Gloss μ - Manual (Page 48)

47
English
Calibration and Autodiagnosis 15
Calibrating standards
To ensure exact calibration, only
original standards from the
manufacturer should be used.
These are calibrated against tested
primary standards. Their surface
must not be touched and must be
protected against scratches. Due
to environmental influences,
however, the values of standards
can change over the course of time
even if they are handled gently. For
this reason, you should have the
calibration standards tested by the
manufacturer at regular intervals
(we recommend annually).
Checking standard
We recommend the regular use of
a separate test standard for control
of test equipment. The frequency
of this verification depends on the
conditions of usage (for example
monthly). The gloss standards are
integrated into an aluminum guide
in which the measurement device
is positioned exactly. Perform the
measurement as you would
normally, for example in Basic
mode. The displayed measure-
ment value must not deviate from
the value printed on the standard
by more than one unit. Otherwise
you should check whether there is
dirt and dust on the high gloss
standard in the holder or test stan-
dard. If cleaning and recalibration
do not offer any improvement,
please get in touch with our
Customer Service.
Cleaning standards
The accuracy of the measurement
can be significantly impaired by
using dirty or damaged standards.
Since the surfaces of the standards
are 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 as you
clean and make certain there are
no large particles stuck in the cloth
that could damage the surface. Do
not use any acetone!
For dirt that is difficult to remove,
use an optical cloth dipped in li-
quid. Then wipe the surface with a
dry optical cloth.
Exact calibration is not possible
unless the standard is in perfect
condition. If the condition of the
standard seems doubtful because
of its appearance or measurement
errors, we will be happy to check it
for you.