Fisher FERITSCOPE FMP30, Руководство оператора

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Page 60 Operator‘s Manual FERITSCOPE
®
FMP30
Normalization, Calibration and Master Calibration
6 Normalization, Calibration and Master Cali-
bration
The following factors influence the readings of a

-ferrite content measure-
ment:
 Geometry of the specimen (size of the reference area, curvature, dis-
tance of the measurement location from the edge of the specimen,
sheet thickness, cladding thickness)
The correction of these influencing quantities should be carried out
based on the correction factors listed
beginning on Page 117.
 Probe tip wear
To a certain degree, probe tip wear can be corrected through a correc-
tive calibration (
beginning on Page 64) or even better, through a
master calibration beginning on Page 70). Too much probe tip
wear, which becomes noticeable through an increased scatter of the
readings on a specimen with a homogeneous

-ferrite content distribu-
tion (e.g., a calibration standard), cannot be corrected. In such a case,
the probe must be sent to your authorized distributor or directly to
FISCHER for repair.
6.1 Information Regarding Normalization, Calibration and
Master Calibration

The information in Chapter “1 ‘Safety Information’, beginning on
Page 1“should be observed with every normalization, calibration and
master calibration!

All measurements should be performed with great care! Only in this
manner can the trueness specified for the used probe be ensured
during the subsequent measurements.
Creating user-specific calibration standards to determine, for exam-
ple the influence of the curvature or thickness of the specimen is not
recommended because the

-
ferrite content of the starting material
can be altered even with most careful mechanical processing, espe-
cially in the surface area that is registered by the probe.