False Signals And Reasons; Magnetic Mineralization Indicator; Rocks And Searching In Rocky Terrains - Nokta Simplex LITE User Manual

LARGE OR NEAR-SURFACE
TARGETS
Targets which are near the surface may give multiple
different signals to the device. If you suspect a target
near the surface, lift the search coil and swing it more
slowly until a single signal is received.

FALSE SIGNALS AND REASONS

Sometimes, the device may produce signals which
are similar to a target signal although no metal target
is present. There are various reasons for the false
signals received by the device. The most common ones
are ground mineralization or rocks with high mineral
content, surrounding electromagnetic signals, operation
of another nearby detector, rusted or corroded iron or
foil in the soil or sensitivity value set too high.
You can see the mineralization level of the ground by
following the magnetic mineralization indicator on the
screen and adjust the sensitivity accordingly.
IMPORTANT! If the device receives a lot of noise and/
or emits false signals and you cannot eliminate it by
reducing the sensitivity to 25, first set your sensitivity
back to its original level. Then increase the Ground
Suppressor value until the noise is eliminated. As the
Ground Suppressor value is increased, the device's
sensitivity to high conductive (silver, copper etc.) targets
will decrease.
Surrounding electromagnetic signals can be eliminated
by reducing the gain. If another detector is operating
nearby, you may attempt to shift the frequency or
perform your search at a distance where no interference
occurs.
MAGNETIC MINERALIZATION
INDICATOR
The Magnetic Mineralization Indicator consists of 5
levels. The indicator bars do not rise at low mineral
levels during search and at start up. In areas where the
magnetic mineral level is high, the indicator bars will
rise according to the intensity. This measurement can
be summarized as the level of magnetic property and
intensity of the ground.
This measurement is important from two aspects. First,
on grounds with high magnetic mineralization, search
depth is low and users should be aware of this fact.
Second, magnetic mineralization is a property which
is particularly seen with mineralized rocks and this
measurement plays an important role for the device
to eliminate the false signals produced by these rocks.
ROCKS AND SEARCHING IN ROCKY
TERRAINS
Challenging ground conditions arise especially when
conductivity and magnetic properties of the ground are
too intense. Operation of the device over such ground
is made possible by selecting the best operating mode,
sensitivity and ground balance settings.
Stones and rocks or cavities inside the ground are as
important as the ground itself in regards to the search
and target detection quality.
Hot rocks are classified as negative or positive based
on their ID being low or high in comparison to the ID
of the soil they are in. One or both of the types may
be present in a field. The negative and positive effects
mentioned here will only be valid if ground balancing is
properly done on the existing ground. Otherwise, soil
itself will not act differently from hot rocks in terms
of ID.
Positive rocks act just like metal and produce a metal
sound. In the All Metal mode they produce a "zip zip"
sound when the search coil is moved over them. If the
signal is strong enough, the device may produce an ID
for these rocks. Negative rocks in the All Metal mode,
produce a long "boing" sound when the search coil is
moved over them. The device does not give an ID for
these rocks even if the signal is strong.
Positive rocks provide a typical metal sound in
discrimination modes. Negative rocks do not provide a
sound in discrimination modes (except for rare cases of
false signals).
Therefore, you can make a decision by listening to
the audio responses produced by the device in the
field. If you receive a metal sound, it means that you
either detected a positive rock or a piece of metal. If
you receive a strong signal and a stable ID, you can
distinguish if the detected target is a rock or metal by
checking the ID. However, remember that weak signals
may produce different IDs and metals under rocks may
produce different metal signals. Therefore, the most
appropriate action is to dig up when a metal signal is
received.
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