Minelab GPX5000 Instruction Manual download pdf (Page 21)

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GPX 5000 Range

GPX 4800 Range

Tracking, Fixed

Ground Balance

Compensating for ground mineralisation.

Most ground contains not only sand but also many different

chemicals, minerals and salts. These extra materials are

referred to as ground mineralisation. If not compensated for,

this ground mineralisation may produce erratic sounds known

as ‘ground noise’. This ground noise can make it more difficult

for you to hear target signals; particularly soft target signals

from small/deep targets.

The Ground Balance (GB) function in your GPX Series detector

tests for ground mineralisation and compensates for it; thus

reducing ground noise. This ensures signals from targets, such

as gold nuggets, are not confused with ground noise. The

GPX 5000 and GPX 4800 can be operated in Tracking or Fixed

Ground Balance.

Tracking

Tracking instructs the detector to cancel the effects of

ground mineralisation, and will automatically monitor the

mineralisation level and adjust the Ground Balance setting

when ground conditions change during detecting.

Tracking is preferred in heavily mineralised ground, especially

where the mineralisation is variable, or when you want to

cover a large area quickly and efficiently.

Tip: Use the simple GB tests

for Tracking (p. 41) and

Fixed (p. 43) to regularly

check that your detector is

compensating for

ground noise.

Fixed

Fixed holds the last Ground Balance setting. In ground where

the mineralisation is consistent, Fixed will provide greater

depth, sensitivity and sharper target signals; provided that an

effective Ground Balance is maintained.

Fixed will provide slightly improved performance but it will

require you to regularly re-balance (p. 42) when necessary.

Using the Quick-Trak button is an easy way to do this.

Note: Where possible, always search in Fixed GB to

maximise depth and sensitivity, and only use Tracking in

areas with excessive ground noise and/or rapidly changing

mineralisation, often referred to as variable ground.

Quick-Trak Button

The Quick-Trak button found on the handle assembly

allows you to temporarily switch between Fixed and Tracking

or vice versa.

The Quick-Trak button only changes the Ground Balance

position (Fixed or Tracking) while the button is pressed. Once

the button is released the Ground Balance setting returns to

the switch position selected on the front control panel.

The Quick-Trak button will most commonly be used to Ground

Balance the detector, and also to fix or hold the Ground

Balance setting while pinpointing.

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