NewSonic SonoDur2 Issue 04 09/2016 Page 31
7.4.4 Performing a Measurement by Means of Hand-held Probes
The performance of measurements is only possible, if the SonoDur2 display device is set to the
measurement mode. The test force has to be applied manually against a spring in the probe casing.
As a general rule, the forces are significantly higher than when using motorized probes (HV1-10N,
50N-HV 5 or HV 10-100N) and the spring is already strongly pre-stressed, so that the nominal test
force will be reached after a very short distance – approx. 3 mm penetration path back into the
housing. This requires an extremely careful handling of hand-held probes in order to prevent damage
to the diamond if it touches the surface too hard!
Please note:
Dwell time is set fixed to zero (will be set automatically if a hand-held probe is detected) and has
to be verified before measuring!
This is the proper way to proceed:
1.) Carefully attach it preferably perpendicular to the test object surface – the contact signal
appears in the display
2.) Press the probe gently and continuously on the material until the probe attachment sleeve
slightly touches the test object surface or - if the probe attachment sleeve is unscrewed -
until the end stop inside the probe casing has been reached. Thereby, always keep an eye on
the probe or the test position since the device display only shows the old measurement
value!
3.) When gently pressed, the nominal test force will be already reached before the end position
and the hardness value will be immediately calculated from the measured frequency shift –
raise the probe and only now read the measurement value!
It is absolutely unnecessary and also hazardous to press hard and long time because the measure-
ment has already been performed long before the end stop is reached. It is also not required to
perform the test sequence within a short period of time limit as it is possibly need to be done with
any other hardness testers. On the contrary: It is advisable to leave yourself enough time in order to
perform the entire process slowly and in a controlled manner. In this way, overloads or damages to
the diamond can be prevented. The probes behave extraordinarily good-natured and any operator
influence is hardly felt. In addition, the measurement results are direction independent.
With the above method, exact measuring results can be achieved after a short training, which
otherwise can be only achieved by means of additional guidance supports or support stands.
Your Complete Source for
Testing Equipment. Since 1969!
www.BergEng.com
Berg Engineering & Sales Company, Inc.
Tel 847-577-3980
info@bergeng.com
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