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• The selection of the suitable measuring probe is often a compromise between
different influences and properties. Sometimes it is necessary to try out several
probes until the most suitable one is finally found for the respective test object.
• The measuring probe is the "end piece '' of the measuring instrument. It
transmits and receives ultrasonic waves, which the instrument uses to measure
the thickness of the material to be examined. The probe is connected to the
gauge by an adapter cable and two coaxial connectors. When the probe is in
use, plugging in the connectors is easy: either the plug fits into the socket or
into the device itself.
• The measuring probe must be inserted correctly to obtain accurate, reliable
measurement results.
This is briefly described below, followed by instructions for use.
The upper figure shows the bottom view of a typical measuring probe. The two half
circles are visible, visibly divided in the middle. One of the semicircles directs the
ultrasound into the material to be measured and the other directs the echo back to the
measuring probe. When the measuring probe is placed on the material to be
measured, it is located directly under the centre of the spot whose thickness is to be
measured.
The picture below shows the top view of a measuring probe. It is pressed onto the
measuring probe from above with the thumb or forefinger to keep it exactly placed.
Only moderate pressure is required, as the surface only needs to be positioned evenly
on the material to be measured.
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