NewSonic SonoDur2 Issue 04 09/2016 Page 30
pushing the probe slightly upwards, once it moves outside. At the end of the motor movement, the
operator can gently press against it with his hand and reattach the probe protective tube onto the
test object without any great effort. The measuring time should be as short as possible, for instance,
1 or at maximum of 2 seconds. In this way, the effect of tilting will be minimized in both cases. As in
all manual measurements, this procedure requires a certain amount of practice and patience.
Free Measurements with Free Vibrating Rod:
Attention:
This testing guidance requires extensive training on hardness reference blocks and should be only
performed by experienced operators!
When taking measurements with a free vibrating rod (Figure 7.17), it should be proceeded in such a
way, that the penetration time is initially set to 1 second. Preferably, the probe is held perpendicular
to the test surface with one hand. At first, the vibrating rod does not touch the surface, i.e. it directly
sticks out above the material surface into the air (this task is normally fulfilled by the protective
tube). The motor movement will now be commenced with the other hand by tapping the probe
symbol on the SonoDur2 device and the probe carefully placed and held with the diamond tip onto
the test object. As soon as the diamond touches the material surface, the motor will press against
the operator’s hand. The operator has to keep still and press against it, until the measurement time
has elapsed and the motor retracts again.
Example: Manual Measurements without Motor and without Probe Coupler:
In the device menu Settings (Figure 7.20 and Figure 7.21), the manual measurement mode with lifted
probe tip (approximately 4 mm) can be selected. This is indicated in the Measurement menu by
“Manually operated” (up to V1.07 it is named Hands-free) at the top left corner (Figure 7.22) - by
tapping on it, you will also get directly into the selection menu “Manually operated” (Figure 7.21).
Once the operator manually pushes the vibrating rod carefully on the test material, a hardness
measurement will be taken. Shortly after the contact with the test object has taken place, the
penetration time starts to count down and the measurement will be triggered.
As soon as the manual measurement is completed, an arrow will be shown on the display, indicating
that the probe should be raised (Figure 7.23). When measuring without a protective sleeve, the
vibrating rod is carefully attached by hand and the probe is pushed down slightly (approximately 3 - 4
mm) and held until the measurement time has lapsed (1 or a maximum of 2 seconds). Also in this
case, an extensive practical training is recommended.
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