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3.3.1.6 Testing Light Samples
If the samples are lighter than specified in chapter "3.3.1.4 Test Condi-
tions" or sample sections have unfavorable mass distribution they can
vibrate as the impact body hits the test point. This results in unwanted
energy absorption. Such samples shall be supported by solid worktops.
If the mass falls below the specific requirements but still exceeds the
coupling amount then coupling it to a larger mass can help prevent vibra-
tions.
The following requirements must be met for coupling:
• The contact surface of the sample and the surface of the solid support
must be level, flat and ground smooth.
• The sample must exceed the minimum sample thickness for coupling.
Follow the coupling procedure.
• Apply a thin layer of coupling paste to the contact surface of the sample.
• Press the sample firmly against the support.
• Push the sample in a circular motion and carry out the impact as usual,
perpendicular to the coupled surface.
NOTE! Clamping may strain the sample, which can affect the
hardness readings.
16
3.3.1.7 Testing Curved Surfaces
The instrument works properly only when the ball indenter at the front of
the impact body is precisely at the end of the tube at the time of the im-
pact. When concave or convex surfaces are tested, the ball indenter either
does not entirely leave the test tube or comes out too far. In such cases,
replace the standard support ring by a specially suited ring, see chapter
"14. Ordering Information" or contact your local Proceq representative.
Figure 14: Leeb Testing on Curved Surfaces
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