Minelab GP 3500 User Manual download pdf (Page 29)

glossary of common terms

– continued

page 50

l 6 user info l

page 50

GP 3500

Salt The presence of high salt content in the ground being searched

will have a similar but different effect on the metal detector ground

balance as does mineralization.

Salt content causes a negative (-) response rather than the

positive (+) response of laterite soils. The detector needs to

therefore 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 mode being operated in (Double

D/Mono/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. This threshold hum is the

background sound made as the detector operates. Threshold

can be set anywhere between silent and loud, but a soft, audible

level is normally suggested.

Target Response The electro-magnetic effect generated by the metal target under

the influence of the TX field.

Target Signal The audio signal (or change in threshold) caused by the presence

of a metal target as the coil passes across it.

Tracking The function of Automatic Ground Balance where the GP 3500

makes continuous adjustments to the ground balance to

compensate for changes in the mineralization of the ground.

TX TX refers to the transmit signals or electromagnetic pulses,

sent into the ground by the coil.

detector care and safety

l 6 user info l

page 51

GP 3500 GP 3500

www.minelab.com

page 51

– take care

The GP 3500 is a high quality electronic instrument. It has been designed for

professional gold prospecting use and the electronics circuitry is encased in a rugged

housing. Take care of your detector in the following way:

Keep the detector clean and dry. It is very important to keep all electrical connectors clean

and dry.

The control box is not waterproof, even though it has been designed to be water-resistant.

Take care to avoid it becoming wet.

The coil is water resistant and may be used in rain or wet conditions. The coil is not

waterproof. Do not immerse the coil in water.

Regularly replace such items as teardrop washers and skidplates to give long life to

your detector.

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.

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 coils.

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.

The control box and coil should not come into contact with petrol or other oil-based liquids.

If any part of the detector comes into contact with corrosive substances, including salt or salt

water, it should be washed with fresh water.

Clean the detector with a damp cloth using a mild soap detergent.

Do not use solvents.

Do not open the control box as this will void your warranty.

All circuitry repairs should be sent back to Minelab or an Authorised repairer.

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