OKM eXp 6000, User Manual

Page: 77 / 86

Field procedure 77
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What is the form of the object you search? If you are looking for an angular metal box, the
identified object in your graphic should have a form according to this.
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To get better values concerning depth measurements, the object has to be in the center of the
graphic, which means it has to be framed by normal reference values (normal ground). If the
object is on the side of the graphic and not totally visible an estimated depth measurement is not
possible and also measurement of size and form are limited. In this case, repeat the scan and
change the position of your scan area, to receive an optimal position of the anomaly inside of the
graphic.
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There should not be more than one object in a scan. This will influence the depth measurement.
It is useful to scan partial areas over such targets.
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You should do at least two controlled scans to be more sure about your results. This is also
important to recognize areas of mineralization.
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Most important rule when dealing with mineralization.
REAL TARGETS DON'T MOVE!
If your
target moves then it is most likely mineralization.
7.3.1 Orientation of the probe
During a measurement the probe should always have the same distance to the ground. Generally we
recommend a height of about 5 – 10 cm from the surface of the ground if possible.
In the event that you are going to go over stones, wood or high grass that is higher, start your scan with
the sensor higher right from the beginning. In circumstances like these, then perhaps you will need to
start the scan with the probe at a height of 2 feet (50 cm) and keep it at that level for the entire scan. It
is important to maintain the height, this will eradicate many errors. As a rule, do not change the height
during a scan for it may create unnecessary errors.
Another important aspect is the physical orientation of the probe. During the “Parallel” scan mode the
orientation of the probe does not change because you are always measuring in the same direction.
OKM GmbH
www.okmmetaldetectors.com
Figure 7.6: Example of erroneous scan in Zig-Zag mode (“rotational errors”)