Minelab GPX-4000 Service Manual download pdf (Page 30)

Range

Factory Preset

Slow, Medium, Fast

Medium

55Tracking Speed

Keeping up with Changing Ground

(Ground Balance, pg. 40)

When searching in highly variable mineralisation,

Tracking Ground Balance is the preferred setting.

Tracking Ground Balance automatically adjusts the

Ground Balance as necessary to maintain stability

and detection depth.

The GPX-4000 has three Auto Tracking Speed

options: Slow, Medium & Fast.

If the ground being detected has mineralisation

which is changing too often for you to search in

Fixed, then Tracking Speed allows you to gradually

increase from Slow Tracking Speed, into Medium

Tracking Speed, then into Fast Tracking Speed, as

required.

The preferred Tracking Speed is the slowest speed

which still keeps up with the variability of the

ground mineralisation.

In ground conditions that make operating in Fixed

impractical, the factory preset Medium setting

provides a good compromise between effectively

maintaining the Ground Balance and pausing the

Ground Balance when a target is located.

Coils with Tracking

The Fast Tracking Speed is very effective at adjusting

the Ground Balance in highly variable soils. Its use

will only be required in extreme cases.

When using a Monoloop coil, the nature of the

Tracking tends to be more aggressive. Faint, deep

targets may be 'tracked out'. In these extreme,

highly variable soil types, you may achieve better

performance by opting to use a Double D coil

instead of a Monoloop and then selecting the most

appropriate Tracking Speed.

Ground

Balance

Tracking

Fixed

Initial Very Fast Ground

Balance

Every time you switch

from Fixed to Tracking on

the front control panel or

via the Quick-Trak button,

the GPX-4000 will initiate

a very fast auto Ground

Balance. The Tracking

Speed does not affect the

speed of the initial very

fast auto Ground Balance.

The GPX-4000 offers two separate Sensitive Soil/

Timings options - Smooth and Extra.

The Sensitive timing found on previous GP series

detectors is now called Extra, and provides an

increase in signal response and depth on smaller

targets where ground conditions allow it to be used

effectively.

In milder ground conditions, with minimal ground

signals, the Sensitive Extra setting is the preferred

option, however Minelab recommends new users to

first become familiar with the GPX-4000 using the

Factory Preset Smooth setting.

Extra

This setting may increase the signal from certain

hot rocks near the surface, but can actually help

smooth out the Threshold in certain ground types,

particularly with Double-D coils. In mild ground

conditions, Extra will provide the best signal

response on a small, deep target.

Smooth

The all-new Smooth option is the Factory Preset

setting for Sensitive. It is a radically different timing

that sacrifices some depth, but does an excellent

job at eliminating most signals from hot rocks

and ground noises. Highly mineralised areas that

produced small and relatively shallow nuggets, are

well worth another search, particularly those areas

where a Monoloop coil was previously unusable.

The Smooth option can work well in combination

with the factory preset Patch Mode (pg. 28),

particularly when you are after the smallest bit of

gold, to let you know you are in the right area.

Sensitive

Soil/Timings

Range

Factory Preset

Smooth, Extra

Smooth

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Minelab GPX-4000 Service Manual Page 30

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