Minelab GPX 5000 User Manual

88 Glossary
Control Box
This encloses the electronic circuitry of the
detector. The control box generates the
Tx (transmit) signals sent by the coil and
processes the Rx (receive) signals detected by
the coil. All functions are located on the front
and rear panels of the control box.
Discrimination
The ability of a detector to determine if a
located target is made from ferrous metal (iron
or steel) or non-ferrous metal (non-magnetic).
Double D Coils
Two wire windings 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 sensed by the receive system of
the detector and indicated to the operator by
an audible 'beep'.
False Signals
These 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 will be 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 GPX Series have an
'automatic Ground Balance'. When Ground
Balance is used in the Tracking setting it
continually compensates for changes in the
ground mineralisation.
Halo Effect
After a metal object has remained undisturbed
in the soil for a considerable amount of time
a diffusion occurs around the object. This
has the effect of the object appearing to the
detector to be a larger size.

Minelab GPX 5000 Specifications

General

Brand	Minelab
Model	GPX 5000
Category	Metal Detector
Language	English