Ground Balance Procedure For Tracking - Minelab GPX5000 Instruction Manual

Ground Balance Procedure for Tracking

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For Ground Balance type General.
1 Find a clear area of ground without any targets.
2 Change the Ground Balance switch to Fixed.
3 Whilst keeping the coil parallel to the ground, practise
raising and lowering the coil between 25mm and 100mm (1"
and 4") over the ground. Try to lower the coil as close to the
ground as possible without touching it.
4 While moving the coil change the Ground Balance switch to
Tracking and continue moving the coil up and down until
the audio has stabilised and any ground noise has stopped.
Note: A persistent signal may indicate a target in the ground.
If this occurs, move the coil to a new location and repeat
the procedure.
5 When there is no longer a change in the Threshold,
the detector is 'Ground Balanced', and you can
commence detecting.
Note: When changing the Ground Balance switch from Fixed
to Tracking a very fast auto-Ground Balance is initiated prior
to returning to a normal Tracking speed. This fast Ground
Balance only lasts a short time, so it is important to be
moving the coil before changing the switch.
100mm (4")
Ground Balance reset in Tracking
Note: Use this procedure to
periodically test that you are
While detecting in Tracking you should periodically test that
effectively compensating for
you are still in harmony with the ground by stopping, then
ground noise.
raising and lowering the coil. If the Threshold remains stable
then you are still Ground Balanced. If there is a change in the
Threshold then you need to reset the Ground Balance setting.
Do this by continuing to raise and lower the coil, or repeat the
procedure on p.
While raising and lowering the coil press and release the
Quick-Trak button. A short 'beep' will be heard which lets you
know that a three second, fast auto-Ground Balance is initiated
prior to returning to Tracking. Once the audio has stabilized
you can continue searching.
If you find that the Ground Balance needs to be reset quite
regularly, you can select a Faster Tracking speed. Three
Tracking speed options (p. 70)
LCD menu.
Note: In highly variable ground the Tracking may not
instantly update the GB setting when you detect over a large
mineralisation change; so there may be a period of time where
you will experience some ground signals. To avoid missing any
faint target signals you may have to reset the ground balance,
and slow down your detecting sweep speed to allow the
Tracking to keep up with the ground variations.
As Tracking continually updates the Ground Balance
setting, repeated sweeps over a metal target may result
in the detector balancing to the target instead of the
ground; thus diminishing the target signal and increasing
ground noise. Therefore, it is important to use Fixed when
pinpointing or when investigating a potential faint signal
with repeated sweeps.
40.
are available from the
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