Minelab GP 3500 User Manual download pdf (Page 13)

rear controls

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l 4 controls and operation – rear l

GP 3500

page 18

Boost (Shallow/N/Deep)

Boost switch selects the type of processing and filtering applied to

the detector signals to enhance different target signals in different

circumstances.

•

N (Normal) mode may be used for general detecting conditions.

This does not boost any signals.

•

Shallow mode boosts signals from small targets close to the

surface.

This makes faint target signals easier to hear. This setting may also

boost some ground noise, therefore Shallow is better suited for

'quiet' ground conditions or for pinpointing tiny targets.

•

Deep may be used when searching for large targets at greater depth

in 'noisy' ground. Random soil signals are smoothed, making small

changes in the audio signal from large deep targets easier to hear.

This may mask some signals from very small targets near the

surface.

Selection of the more suitable position should be after considering both

the expected target size/depth and ground conditions.

NOTE – When Boost is changed, Threshold may also need to be

adjusted. External amplifiers may be used in addition to the Boost

switch, provided that they have loudness limiters built in. This

prevents loud signals becoming unpleasant or dangerous to the

user's hearing.

Figure 4.14

Boost switch

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l 4 controls and operation – rear l

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GP 3500 GP 3500

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page 19

Soil (Sensitive/Normal/Salt)

This switch is used to optimise the detector for different soil conditions

and targets by changing the signal processing.

Operating Instructions:

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

highly mineralized soil. This position has very good sensitivity to

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

positions.

•

Sensitive mode may be used when searching for small nuggets,

especially in areas with highly mineralized 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 reduce the depth at which large nuggets are

likely to be found.

•

Salt mode may be used in areas containing a high salt content,

be they neutral or heavily mineralized. In highly mineralized

areas without salt, this setting may be less sensitive to small

nuggets than Normal or Sensitive settings, but the difference to

large targets is marginal

Figure 4.15

Soil switch

(Normal/Sensitive/Salt)

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Minelab GP 3500 User Manual Page 13

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