Minelab GPX-4000 Service Manual download pdf (Page 45)

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The GPX-4000 is a

high quality electronic

instrument. Take care

of your detector in the

following way:

Taking Care

of Your Detector

The control box is water resistant, but not

waterproof. Keep all electrical connectors clean

and dry.

The coil may be used in light rain but take care

not to immerse it in water.

The control box and coil should not come into

contact with petrol or other oil-based liquids.

Regularly remove loose dirt and dust from the

control box using a dry paint brush. Clean the

detector shaft and coil with a damp cloth using a

mild soap detergent. Do not use solvents.

The coil housing will eventually wear through if you

scrub the ground with it while searching. Use of a

replaceable skid plate will help to protect your coil.

Regularly replace such items as coil washers and

skidplates to increase the life to your detector.

To prevent dirt entering between the coil and the

skidplate, silk tape, e.g. Leukosilk®, which is available

from chemists, may be used. The use of some other

carbon based tapes, e.g. insulation tape, may result

in some loss of sensitivity.

Do not expose the detector to high temperatures

or leave it in the sun for longer than is necessary.

Shading will help protect it. Do not leave the

detector in a closed vehicle, especially in the sun.

Do not open the control box as this will void your

warranty. All control box, battery and coil repairs

should be sent back to Minelab or a Minelab

authorised repairer.

(Taking Care of your Battery, pg. 21)

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.

Glossary of Terms

(Continued)

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Minelab GPX-4000 Service Manual Page 45

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