Ground Balance Type - Minelab GPX-4500 Instruction Manual

Ground Balance Type

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(Ground Balance, pg. 38)
Range General, Specific, GB Off
Factory Preset General
General
This is the best Ground Balance Type for use in over
90% of goldfield soils and uses the conventional
automatic Tracking as found on the previous Minelab
models. In Tracking, General Ground Balance (GB)
samples variations in the ground mineralisation
and sets a continuously changing average of the
Ground Balance level. General GB is ideal for most
mineralised grounds and is the preferred Ground
Balance Type for soils which have highly variable
mineralisation.
Specific
This is a special Ground Balance Type for use in areas
of highly magnetic, iron-rich soils. Use of Specific GB
will allow you to keep the coil closer to the ground,
and allows Monoloop coils to be accurately ground
balanced in areas normally too 'hot' for their use.
The Tracking function in Specific is more
conservative than in General, and will pause on even
the faintest response, removing the risk of 'Tracking
out' faint signals.
It is recommended that you be more active in
checking your GB setting when using Specific in
variable soils. Stop periodically, raise and lower the
coil, listen to any variations and re-ground balance
where necessary. Ideally, Specific GB should only be
used in soils that are reasonably uniform or
non-variable.
GB (Ground Balance) Off
In very benign soils, such as non-mineralised loam
or sand, there can be very little and sometimes
no ground effect. These areas are quite rare but
are identified when your ground balance doesn't
appear to be doing anything. By switching the GB
Type to GB off you will achieve improved depth and
sensitivity.
This feature will most likely be used by beach
hunters, or inland treasure/relic seekers, as it is
extremely rare to encounter a spot in the gold field
where GB is not required.
Procedure:
Raise the coil off the ground, away from metal
objects, and switch to GB Off. After the tone is heard
you can commence detecting.
Note: To use the Iron Reject function (pg. 80) you need
to operate in General GB Type.
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