Minelab GP 3500 Service Manual download pdf (Page 16)

THE MINELAB ‘GP extreme’

CONTROLS

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CONTROL FUNCTIONS

Iron Discriminate (All Metal/Disc)

Figure 4.18

Selects between discrimination or to turn off the discrimination

altogether (All Metal).

In All Metals, the detector will give varying volume and pitch

signals but this information does not indicate the type of metal in

the object.

In Disc, a strong response from a ferrous (iron) object will cause

the threshold to be 'blanked' or silenced.

NOTE If the target response is too weak for accurate

discrimination, the detector will give a normal target signal.

Level Adjust

Figure 4.19

Level adjust gives the user the ability to select the sensitivity

and likelihood of a target being ferrous or non-ferrous.

It also affects how the detector recognises mineral effects in the

ground, as opposed to metal targets, when 'ground balancing'.

NOTE It is important that you read pages 37 and 38 in

Chapter 5 for more information.

Soil (Normal/Sensitive/Salt)

Figure 4.20

Optimises the detector for different soil conditions and targets by

changing the signal processing.

• N ( Normal ) may be used in all areas, including areas with

highly mineralised soil. This position has very good sensitivity

to a wide range of nugget sizes and is the most versatile of

the three positions.

Iron Discriminate

Figure 4.18 All Metal/Disc switch

P0525-A

Iron Discriminate

Figure 4.19 Level Adjust control

P0526-A

Soil

Figure 4.20 Soil (Normal/Sensitive/Salt) switch

P0527-A

THE MINELAB ‘GP extreme’

CONTROLS

Rx (Receive) (Normal/E/Cancel)

Figure 4.21

Changes the sensitivity and search pattern of the coil to allow the

‘GP extreme’ range of coils to become multi-versatile coils with

different characteristics to suit different environments. This is

achieved by altering the pattern of transmit (TX) and receive (RX)

fields of the coil and how the control box interprets the response.

• Normal can be used in most areas of medium to very high

mineralisation, being the most able to cope with ground

noise. It is also excellent for pinpointing targets as the

response is strongest from the centre of the coil.

• E (Enhance) may be used in most locations of low to medium

mineralisation and for locating small nuggets with Soil switch

set to Sensitive. Pinpointing is not centred in the middle of

the coil, but to one side and may give a complex signal when

the target is very close to the coil.

• Cancel may be used in areas with very high electrical

interference where the Tune function has difficulty selecting

a quiet operational frequency (e.g.: near power lines, electric

fences or under poor atmospheric conditions). Pinpoint in

CONTROL FUNCTIONS

Figure 4.21 Rx (Receive) switch

P0528-A

• Sensitive may be used when searching for small nuggets,

especially in areas with highly mineralised soil. The extra

stability allows the coil to be used closer to the ground in

areas of excessive ground noise. Sensitive may not work

well if the ground is salty.

This setting may also reduce the depth at which large

nuggets are likely to be found.

• Salt may be used in areas containing high salt content, be

they neutral or heavily mineralised. In highly mineralised

areas without salt, this setting may be less sensitive than

Normal or Sensitive to small nuggets.

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Minelab GP 3500 Service Manual Page 16

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