Minelab GPX-4000 Service Manual download pdf (Page 21)

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Soil /

Timings

Salt

Sensitive

The Soil/Timings switch has the ability to change

the electronic 'timing' or pattern of the pulses. This

optimises the detector for different soil conditions,

the type of coil being used and desired target sizes.

Soil/Timings can make a big improvement to your

finds.

Put simply, certain combinations of pulse patterns

(timings) have a particular affinity to certain soil

conditions, (be it magnetic/alkaline/neutral, etc.)

and on different target sizes and conductivities.

By using the Soil/Timings switch, changes to the

timings can be made to improve the performance in

different conditions.

Sensitive

Sensitive timings have been optimised for an

improved response on smaller, shallow nuggets.

There is a slight loss of depth on bigger targets, so

you should not use this setting when seeking out

large deep nuggets.

There are two types of Sensitive settings available

via the LCD, Extra and Smooth

(pg. 55). Smooth is

the factory Preset setting and is very different to

previous GP models. It will eliminate most false

signals from hot rocks and ground mineralisation

whilst retaining excellent sensitivity to small targets.

When switching between Soil/Timings, there is a 1

second pause (ie. 1 second of Threshold) to allow the

change in the detectors electronics to take effect.

Normal (N)

Normal gives you the best performance on a wide

range of soil conditions and will provide the best

depth on a wide variety of target sizes. You will use

this setting most of the time. You should always use

Normal in new areas where you are unsure of the soil

mineralisation and the depth of targets.

Salt

The effect of alkaline salt mineralisation is vastly

different to the effect of ironstone and mineralised

clays. Anyone who operates on dry salt flats will

know how difficult it is to detect. In these areas,

Normal should be tried first, but if the Threshold

is too unstable, then better performance will be

obtained in Salt.

Using the Salt setting may result in a slight loss in

signal response to smaller targets. The response

on larger items remains relatively unaffected and

ground noise is usually minimised. Therefore,

when searching for large deep nuggets in highly

mineralised soil, the Salt setting can be used to

obtain a smoother Threshold, allowing you to hear

those mellow deep nugget signals.

Sensitive

Salt

Soil/Timings

Optimising the Detector

for Different Soil and Target Types

Always remember to re-Ground Balance

the detector after making any changes

to the Soil/Timings switch.

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Minelab GPX-4000 Service Manual Page 21

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