NewSonic SonoDur2 Issue 04 09/2016 Page 39
generated by extrapolation algorithm are not covered by standards and do have a higher
uncertainty. Therefor these values are displayed in red and it is up to the user to decide whether to
use these values or not.
If the converted value is slightly outside the scale limits given in the standards, a value will be
calculated using extrapolation algorithm and displayed in red.
Exceeding the extended conversion limits (extrapolation range)* an error message „Outside
HB Conversion“ (if HB scale is selected) will be displayed . These readings are marked as
deleted and displayed as --- in the information menu (Figure 7.62). Returning to the
measuring menu the latest valid reading will be shown.
Attention:
Extended conversion ranges (extrapolation ranges)* are calculated from the correlations given in the
EN ISO 18265 (ASTM E140). Due to the fact of higher uncertainty of these values the responsible
inspector must decide about the permissibility of the conversions from Vickers hardness into another
hardness scale by his own.
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