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Roughness of the test surface
The sample should have sufficient mass and stiffness. If not, the impact may cause a
displacement or movement, which may lead to a significant measurement error.
As a general rule,
if the weight of the sample is 5 kg or more, testing can be performed
directly.
Sample thickness
The thickness of the sample as well as the thickness of the homogeneous layer (or the
hardening layer of the surface) should have a sufficient material
If the sample surface is not flat, the radius of the test area should not be less than 30
mm (50 mm for type G). If it is not specified, an appropriate support ring should be
used.
The sample should have no magnetic
HMO-BA-e-2020
English
Direct measurement
Clamping
measurement
Coupling
measurement
properties.
German
Direct measurement
Clamp measurement
Coupling
measurement
thickness.
7
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