NewSonic SonoDur2 Issue 04 09/2016 Page 38
7.8 Conversions
7.8.1 Hardness Scale
Selection can be made by tapping on the available scale (Figure 7.58). The conversion standard and
selected material will be indicated in the status bar. Standard or material can also be selected by
means of the "Back"-button.
7.8.2 Standard
Two conversion standards, in accordance with ASTM E140 and EN ISO 18265, are available in its
current version (Figure 7.59) - Status 2015.
Attention:
Please consider the conversion limits. Exceeding the limits of a scale (for example within the HB
scale) you will receive the message out of the HB revaluation and the measurement values will be
shown within the Info-window as deleted (please refer to the representation of the measurement
values outside of the conversion limits, section 7.8.4).
7.8.3 Material
Up to program version V1.07 conversions are only stored for steel, from version V1.09 and higher all
conversions according EN ISO 18265 are available (Figure 7.60). Selecting a differing material as A1
Steel will also automatically select the corresponding CAL factor (deviation of the material properties
related to low-alloy steel, refer to chapter 7.7 Adjustment, page 33).
Please note:
Some conversions are related to a standard, so conversion to HK scale is not possible in EN ISO 18265
(red dot). In that case, you have to select the ASTM140 standard.
7.8.4 Representation of Readings beyond Conversion Limits
Conversion tables according EN ISO 18265 and ASTM E140 are defined over different ranges for
different material tables. For all SonoDur instruments the Vickers scale (HV) is the reference scale
and for every measurement there is always a Vickers value. If there exists no pairs of values in HRC,
HB etc. for conversion, a value will be generated using extrapolation algorithm. If this is unsuccessful,
the user should switch to another hardness scale or select the Vickers scale. Values which are
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