46
Calibration DMP10 / DMP20
9.2 Please observe the following information on calibration/
recalibration
The reference piece and specimen must have the same base material proper-
ties.
The positions of the measuring position on the reference piece and on the spec-
imen to be measured must be roughly the same (curvature, distance from the
edge, hole, platform, and step).
The information for precision (remaining deviations from precision to mea-
sured reading) and repeatability (repeated standard deviation) applies for the
ambient and reference piece temperatures at the time of the calibration. The
values for precision and repeatability may be higher than the values indicated
in the data sheet if the temperatures during the measurement deviate from the
ambient and reference piece temperatures during the calibration.
If measurements are to be performed on both magnetizable (FE) and non-mag-
netizable (NF) base materials, the calibration must be performed using both
base materials (FE and NF)! This is useful when using a dual probe, such as
FD13H and D-FN.
Treat the calibration standards = calibration foils with care. Replace soiled,
bent, scratched or cracked calibration foils or those with severe indentations.
In particular foils with thicknesses of less than 50 µm (2 mils) are subject to
rapid wear. Recommendation: replace the calibration foils after no more than
100 to 200 measurements!
Perform the calibration with care! This is the benchmark for the accuracy to
which the following measurements can be performed. – Measurements can
never be more accurate than the calibration itself!
Do not use the metal sheet (NF/FE or ISO/NF) supplied with the gauge as a ref-
erence piece! As a rule, the material properties of the metal plate will not cor-
respond to those of your own uncoated specimen/reference piece! The metal
plate(s) serve only to check the function of the gauge!
Calibration on NF base material (NF = non ferromagnetic base material): the
difference between the reference piece temperature during the calibration and
the specimen temperature during the measurement should be minimal. Exces-
sive temperature differences have an adverse effect on the measurement ac-
curacy.
To Next Page
Loading...
