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After this, your device will automatically navigate into the ground balancing mode. Perform the auto
ground balance on the clean area of ground you located prior to changing the coil. Refer to
appropriate paragraph under section “Ground Balance”. Alternatively if a section of clean ground
cannot be located perform the balance procedure using a piece of ferrite or red brick. Refer to the
instruction pertaining to this under the section “Ground Balance” Pressing GROUND exits the
balancing mode. Your device is now ready to work with the new coil.
Attention! All of the above procedures are necessary when making changes to the software version
(flashing).
If your unit is equipped with several periodically used coils we recommend that you in the case of a
shutdown (e.g. seasonal), before starting the search to restart the detector, i.e., to avoid confusion,
to adapt the electronic unit to the sensor (coil).
SEARCH AND IDENTIFICATION METHODS
When scanning the ground move the coil smoothly over the surface of the ground while maintaining
a constant distance of 2-3 cm This distance is optimal from the viewpoint of suppressing the
influence of ground mineralization, and hence, for the proper identification of the metal objects.
Avoid touching the ground with the coil. It is important that the distance between the coil and the
ground remain constant (see Figure 16). Keep in mind that the quality of this operation has a direct
impact on the correct identification of desired targets. Also try not to make sudden movements of
the coil horizontally. Optimal scanning speed is 40-50 cm/s. Each pass of the sensor should overlap
the previous one.
Use additional scans to more accurately identify the type of object by centering above the target.
Sweep the coil through the maximum signal area as accurately as possible maintaining a constant
distance between the coil and ground. For the same reason scan the target with coil in the direction
of the least amount of surface change in the ground. In this case, the effect of soil will be minimal.
When the search coil interacts with a metal object there may be a single tone burst or possibly
several tone bursts in rapid succession. Therefore one should pay attention to the following. When
the detector responds with a single short high tone and the signal level is rather stable it is a good
probability that the targets is not very large and of a non ferrous nature at a depth of more than 5cm.
On the other hand if the detector gives a series of short high tones (usually 3) then the targets is
shallow and in the so called near zone (less than 5cm). The Signal level will also display a value of 50
or greater.
A series of two short low-pitched sounds indicates that in the area of the coil is an extended ferrous
object (like a nail) located along the scanning direction. If the object is located along the
perpendicular plane of the scan or the coil, the device will issue a single low-frequency short tone.
It is important to note that the DD sensor is characterized by a complex pattern when interacting
with metal objects close to the coil or the near zone (signal levels greater than 80). Therefore when
trying to determine the target ID adjust the coil height to a level that will give a signal strength of 30
to 60 in the Turbo mode and from 15 to 30 in the normal search mode.
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