Search Coil - Minelab GPX 5000 Instruction Manual

90 Glossary
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Salt Mineralisation
Salt content in the ground causes a negative
(–) response rather than the positive (+)
response of laterite soils.
A large salt content in the ground will have
a different effect on the detector than other
types of mineralisation. Therefore the detector
needs to use different filtering techniques to
overcome this effect.

Search Coil

The search coil is the circular plate which
is swept across the ground surface during
detecting. It transmits electromagnetic signals
into the ground and receives the response.
Search Pattern
The search pattern is the area of ground
underneath the coil which is being scanned.
Depending on the style of coil (Double D
or Monoloop) and the Coil/Rx setting being
used (Double D/Monoloop/Cancel), different
coils will have a different shaped area being
covered by each sweep.
Threshold
The continuous audible level of sound
emitted by the detector is referred to as the
Threshold. Threshold can be set anywhere
between silent and loud; but a soft audible
level is normally suggested.
Target Signal
This is a change in the tone (pitch) and volume
of the Threshold when a target is detected
and not discriminated (rejected).
Tracking
The function of automatic Ground Balance
where the detector makes continuous
adjustments to the Ground Balance to
compensate for changes in the mineralisation
of the ground.
Tx (Transmit)
This refers to the transmit signals or
electromagnetic pulses, sent into the ground
by the coil.