NewSonic SonoDur2 Issue 04 09/2016 Page 11
Furthermore special care is to be taken when using hot isostatic pressed blocks are used (applied for
some Leeb-Blocks) because of local scatter in Hardness or Young’s modulus.
The surface of the test object must be definitely bare, free of surface coverage and scale as well as
liquids. In addition, the test object may not move or vibrate when measurement is performed.
During the operation with induction hardening machines, measurements may must not be
performed while a high-frequency field is present, since disturbances could occur or the
measurement system may temporarily fail completely.
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