Manual Nokta Simplex ULTRA (page 28 of 32) (English)

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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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Nokta Simplex ULTRA Manual

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