Accessories; Glossary Of Common Terms - Minelab GP Extreme User Manual

THE MINELAB 'GP extreme'
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ACCESSORIES

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A C C E S S O R I E S
Search coils
The 'GP extreme' is supplied with the 'GP extreme' 1100 and
'GP extreme' 1800 coils. These coils have been specially designed
to take advantage of the new technology and features of this
detector. In addition to this there are also a number of other size coils
will become available in the near future.
These range from smaller coils which give greater sensitivity to small
targets and are lighter and manouverable in heavy vegetation, up to
larger coils which give greater depth. See your Minelab retailer for
the full range.
In some circumstances, other Double D and Monoloop coils will
work on the 'GP extreme', however there are limitations which will
mean that a number of the new benefits of the DVT will not work
properly. In some cases the use of coils not designed for the
'GP extreme' will cause the detector to be unstable and noisy.
Batteries
Spare 10A/hr batteries can be an advantage, especially if travelling
into the outback.
A smaller light-weight battery is also available from Minelab. This is
rated at 4.5A/hr and gives approx. 3 - 4 hours running time per charge.
The weight of this battery is 968g.
Corporate clothing
Minelab also has a range of good quality clothing, e.g. caps, shirts
and jackets available. Ask your local dealer for details.

GLOSSARY OF COMMON TERMS

Control Box The control box encloses the electronic circuitry of the detector. The
control box originates the TX (transmit) signals sent by the coil and
interprets the RX (receive) signals detected by the coil. All user
selectable functions (knobs & switches) are located on the front and
rear panels of the control box.
Discrimination The ability of a metal detector to estimate if a located target is made
from ferrous metal (iron or steel) or non-ferrous metal (non-magnetic).
Double D Coils Double D coils are coils that have two windings of wire that overlap
in the shape of two D's (one reversed). The characteristics of a
Double D coil are stability, especially in heavily mineralised ground,
good depth and sensitivity and a very thorough search pattern.
Electromagnetic Field Commonly called the 'signal from the coil'. An electromagnetic field is
generated within the wire windings of the search coil and this field is
pulsed or sent into the ground. The presence of a metal target in the
ground will disturb the pattern of this field and this disturbance is
registered by the receive system of the detector and indicated to the
operator by an audible target signal "beep".
False Signal False signals are signals, which sound similar to target signals but
are caused by other factors. Common causes for false signals are
incorrect ground balance, hot rocks, signals caused by knocking the
coil on obstacles, etc. With experience, the operator will learn
methods to minimise false signals and to hear subtle differences
between target signals and false signals.
Ferrous Metals Metals composed of or containing iron. A ferrous item is one which is
attracted to a magnet and is predominantly or completely made of
iron or steel.
Ground Balance The ability of the metal detector to compensate for the effects of
ground mineralisation. The 'GP extreme' has "automatic ground
balance". When it is used in Tracking mode it continually
compensates for changes in the ground mineralisation.
THE MINELAB 'GP extreme'
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GLOSSARY OF COMMON TERMS