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15
Manual Ground Balance
Allows you to manually modify the ground balance
value. It is not preferred mostly because it takes time.
However, it is the preferred option in cases where
automatic ground balance cannot be performed or fine
tuning is necessary for the automatic ground balance
value.
SIMPLEX is designed to allow for automatic ground
balancing conveniently on any type of ground. However,
the ground may not be suitable for automatic ground
balancing in some cases and the device cannot ground
balance on such grounds. For instance, wet beach
sand, soils containing alkali or salty water, trashy
sites, ploughed fields, highly mineralized grounds and
grounds with very low mineralization are not suitable
for automatic ground balance. In such terrains, you can
try manual ground balancing. However, manual ground
balance requires a skill which develops over time
through practice.
To perform manual ground balance:
1) Find a clear spot without metals and press the
Ground Balance / Confirm button once.
2) You need to listen to the sounds coming from the
ground in order to perform manual ground balance.
Pump the search coil up and down from about 15-20
cm (~6’’- 8’’) above the ground down to 3 cm (~1’’) off the
ground with smooth movements and keeping it parallel
to the ground.
15 - 20 cm
3 cm
If the sound gets higher when lifting off the search coil
above the ground, the ground balance value is too low,
in other words, the effect from the ground is negative
and the ground balance value needs to be increased
by using the plus ( + ) button. On the other hand, if the
sound gets higher when lowering the search coil to the
ground, the ground balance value is too high, in other
words, the effect from the ground is positive and the
ground balance value needs to decreased by using the
minus (-) button.
3) The ground balance value will be shown on the
display and remain there for a moment. You can return
to the ground balance screen by pressing the Ground
Balance / Confirm button again if the screen switches.
Manual ground balance functions within the range of
0-99.9. Press plus (+) or minus (-) buttons to increase
or decrease the ground balance value, respectively. If
the buttons are pressed once at a time, the values
count one by one and if they are held down, the values
will change quickly.
4) Repeat the above procedure until the sound heard
from the ground is eliminated.
The sound may not be eliminated completely in some
areas. In these cases, listen to the sounds produced
when moving the search coil towards and away from
the ground to check if the ground balance is correct. If
there is no difference between the two sounds then the
ground balance is set properly.
IMPORTANT! Experienced detectorists adjust the
ground balance setting to a slightly positive response
(weak but audible sound is produced when moving the
search coil closer to ground). This method may produce
favorable results for experienced users in certain fields
where small targets are searched for.
Ground Balance Value
Ground balance value provides information about the
ground you are searching on. Some typical ground
types are as follows:
0-25 Wet salt water or wet alkali soils.
25-50 Wet salt water and wet alkali soils covered with
dry layers.
50-70 Regular, low-quality soils.
70-90 Highly magnetic soils, magnetite or maghemite
and similar highly mineralized soils, black sand.
17


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