Nokta detectors Fors Gold - Manual (Page 17)

Metal detectors work on the principle of conductivity and all metals are conductive. On the
other hand, soil itself has a certain degree of conductive property. Under certain
conditions, the conductivity level of the soil may be very high. Soil and rocks have
magnetic properties as well as conductivity. For this reason, when searching in soil and
between rocks, in order for the detector not to give a target signal for the soil, the detector
should be able to eliminate the soil and minimize the effects of rocks while still detecting
real targets. Otherwise, false signals and noise may mislead the user and make it
impossible to find the target. The purpose of ground balancing is to eliminate these false
signals and noise.
When you sweep the search coil over the ground, you can see whether the ground balance
is adjusted properly or not. However, if the signals and noise continue when the coil is
raised up, you must consider the possibility of the electromagnetic waves in the
surrounding environment. Electromagnetic waves may result from power lines or from the
operation of electrical devices, radars, wireless radios, and even TVs. In such a case, first
make sure that the device is silent by making the sensitivity and threshold adjustments
and then ground balance.
When using this mode, if you record the IDs of the rocks in the field and then
mask them using the ID Masking feature, nugget detection will be more
convenient. When masking IDs, you must use the ID value closest to the ID of the
rocks. Otherwise, you may miss the nuggets under the rocks. Consequently, you
may need to change the default ID masking value(10) of this mode to another
value based on the IDs of the rocks in the field. For more details on eliminating
hot rocks, please read the related sections Target ID and ID Masking, Hot Rocks
and Searching in Rocky Areas, and Metals Under Hot Rocks).
If you dig a target signal in a gold field and find rocks, be sure that there is no
small gold nugget underneath.
In the BST mode, the device will produce a low tone for iron and positive hot
rocks. For all other metals, it will produce a single tone just like in the General
Search Mode, which increases in pitch as the coil approaches the target. The gold
nuggets under rocks may generate a tone and ID different from that of gold and
this totally normal.
To get familiar with the warning audio tones, we recommend you to test the
device with different metals and rocks before you use it in the field.
IMPORTANT! When searching in the BST mode, you must sweep the coil more
slowly (about one full right & left pass in 1 second).
SEARCH MODES
GROUND BALANCE
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