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3.3.3.5 Installation of the Special Foot
The default foot allows the measurement to be performed on
5º
5 º
every surface. The probe must be perpendicular to the sur-
face (± 5°). The special foot can be used to increase the re-
peatability and avoid the distortion of the results, see chapter
"14. Ordering Information".
1. Unscrew the standard foot and remove it
2. Screw the special foot to the probe tightly
NOTE! To measure in places with limited accessibility, the
probe can be used without any foot. If doing so, the side of
the rod of the probe must not touch any surface or be han-
dled, as this leads to biased readings.
3.3.3.6 Conversions into Other Units
The frequency shift measured by the UCI probe is not only influenced by
the hardness, but also by its elastic properties. The default conversion curve
from the frequency shift to Vickers is valid for low-alloyed steel with an e-
modulus of 210 ± 10 GPa. As soon as a material has to be tested with a
different e-modulus, this existing conversion curve must be adapted. The
best way to do so is to calibrate the instrument on the material to be tested.
The Equotip 550 offers for this a fast and easy way. Once the hardness value
is converted to Vickers, it can be further converted to any other available
hardness unit according to either the ASTM E140 or the ISO 18265. Another
option is to adjust the default conversion based on the measurement of
Portable Rockwell or Leeb. To do so, see chapter "6.5 Combined Method".
24
3.4
Instrument Verification / Daily Performance Check
See chapter "6.2 Device Verification" and follow the on-screen proce-
dure. After the verification process your instrument is fully operational
and you can now continue with your measurements.
NOTE! The performance check should be done regularly be-
fore using the instrument to verify the mechanical and elec-
tronic functions of the probe and the indicating device. This
requirement is also included in the relevant hardness stand-
ards, see chapter "13. Standards & Guidelines".
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