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3. Choose the sensitivity
You always expect to set the sensitivity more higher.However,in the higher
sensitivity range,the detector will be sensitive to the electromagnetic
interference that comes from the power lines or cables around,and it will do
abnormal reaction to the mineralization soil or electrical conductivity soil.If
you move the search coil in the detection area,and the detector sends an
unstable false signal,please decrease the sensitivity.
If you operate the detector with your partner at the same time,please pay
attention to keep more than 10 meters away from each other,and decrease
the sensitivity appropriately.
4. Move the search coil
When detecting,you should move the search coil at a constant speed,not
unsteadily.Let the search coil be parallel with and about 1/2 inch from the
surface,not to swing it like a pendulum,high and low above the ground.(See
Fig.18)
Most valuable metal objects will send repeatable signals.If the signal isn’t
repeatable,it’s mostly a false signal.When there is a clear sound instructing
the buried targets,you could read out the approximate target type and depth
on the LCD screen.And you could also move the search coil above the target
objects fast,in order to get a more stable signal.
5. Make use of the sound,to help discriminate
In the process of detection,you don’t always watch the screen.And the sound
identification system will sound four frequency tones to help you discriminate
the targets.
Low pitch——ferrous metals,such as iron nail,caps and so on.
Mediant——S-caps,5￠nickel coin.
High pitch——zinc,copper,aluminum and silver,such as 1￠,10￠,25￠and
so on.
Fig.18
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