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Measure FERITSCOPE® DMP30
8 Measure
Measurement influencing factors do not significantly affect the FERITSCOPE®
DMP30. Ferrite content measurements can be carried out regardless of the sub-
strate material properties starting at a plating thickness of 3 mm (0.12 "). Due to the
used magnetic induction measuring method, which captures all ferromagnetic com-
ponents in the same manner, the measurements are always stated in -ferrite. No
distinction is made between the different material components, such as
-ferrite and
martensite.
8.1 Notes on measuring
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.
Rough surfaces: For measurements on rough surfaces, we recommend group-
ing the measured readings into blocks and working with the block mean values
for further evaluation. This minimizes the measured reading variation in the
evaluation that follows.
Finding changes in material structure: Finding, e.g., weld seams in polished
surfaces is made easy through the “Free Running” measurement mode. When
scanning the surface with the probe with this function enabled, the continuous
readings are displayed only. A change in the ferrite content reading indicates
that the weld seam has been found. Tip: To better detect changes in the mate-
rial structure, perform the Zero calibration step on the test part. This allows the
measuring system to record the material properties and can react more sensi-
tively to changes related to the recorded properties.
As a basic rule: If the specified precision is not achieved during the measure-
ment, you must check the calibration recalibrate the probe if necessary.
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