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Minelab GPX 5000 User Manual

Minelab GPX 5000
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73
Discrimination is dependent on target signals being strong
enough for the GPX Series to determine if the target is ferrous
or non-ferrous. If the signal is weak the detector will give a
non-ferrous response until the signal becomes stronger, i.e.
due to a hole being dug and the coil getting closer to the
target. The Iron Reject function is designed this way to allow
maximum accuracy, while limiting the chances of rejecting a
desirable target.
In some areas, such as mining camps, old building sites
or a farmers’ field, you may choose less cautious levels
of discrimination. This may be because the soil is of low
mineralisation or the targets are large non-ferrous relics
that will not resemble ferrous targets. You may also use less
caution in a goldfield that has high levels of rubbish that
would not be otherwise detectable. Iron Reject allows you
to increase the amount of discrimination while knowingly
accepting more risk.
When Iron Reject is activated the detector rejects ferrous
objects by blanking the normal target signal. You will notice
the Threshold tone goes silent as the coil passes across the
ferrous target.
Tip: To improve
discrimination accuracy
you should always test the
target from at least two
directions (90˚ from each
other) so that the detector
‘sees’ the target from
different profiles.
Caution: Do not attempt
to discriminate by
raising and lowering
the coil on a deep or
partially dug target. An
accurate discrimination
requires an even side-
to-side coil motion. It is
recommended to dig all
targets that do not give an
obvious rejection.
Target signals when detecting in All Metal.
Target signals using Iron Reject. Ferrous target blanked.
Ferrous Target
Audio Signal
Audio Signal
Blanking Signal
Non-Ferrous Target
Threshold
Threshold
Ferrous Target
Non-Ferrous Target

Table of Contents

Other manuals for Minelab GPX 5000

Questions and Answers:

Minelab GPX 5000 Specifications

General IconGeneral
TechnologyMPS, DVT & SETA
Ground BalanceAutomatic and Manual
DiscriminationIron Reject
DisplayLCD
Battery LifeUp to 12 hours
Coil11" Double-D coil
Audio OutputBuilt-in speaker, headphone jack
BatteryLithium-ion rechargeable battery
Length1100 mm - 1300 mm (43.3" - 51.2")
WaterproofCoil is waterproof; control box is not
Target IdentificationAudio only
Weight2.4 kg (5.3 lbs) including battery
Headphone Jack6.35 mm (1/4")

Summary

Quick Start

Assembly

Connecting Control Box

Attaching the control box to the detector's upper shaft.

Connecting Coil Cable

Connecting the coil cable to the control box.

Connecting Battery Pack

Connecting the battery pack and headphones to the detector.

Charging the Battery

Front Control Panel

Rear Control Panel

Turning the Detector On

Search Mode

Custom Search Modes

Allows selection of modes like Patch, Hi-Mineral, Hi-Trash, Pinpoint.

Tune

Auto Tune Function

Automatically scans for quietest frequency channel to reduce interference.

Manual Tune Function

Manually selects channels for optimal performance and least interference.

Threshold

Soil/Timings

Special Timings

Accesses advanced timings like Fine Gold, Sensitive Extra, etc.

Coil/Rx

Ground Balance

Tracking Ground Balance

Automatically monitors and adjusts ground balance for changing mineralisation.

Fixed Ground Balance

Holds the last ground balance setting for consistent mineralisation.

Ground Balance Procedure for Tracking

Step-by-step guide for setting up Tracking Ground Balance.

Ground Balance Procedure for Fixed

Step-by-step guide for setting up Fixed Ground Balance.

Ground Balance Type

Special Soil/Timings

Fine Gold Timing

Highly sensitive to small targets in mineralised ground.

Manual Tune

Motion

Rx Gain

Audio Type

Audio Tone

Stabilizer

Signal Peak

Tracking Speed

Iron Reject

Iron Reject Off (All Metal)

Detects all metals, no ferrous target rejection.

Pinpointing

Pinpointing with Fixed Ground Balance

Procedure for accurate target location before digging.

Detecting Tips

Identifying Target Signals

Differentiating between target signals and ground noise.

Commander Coils

18" Round Double D Coil

For deep penetration through heavy mineralisation.

8" Round Monoloop Coil

Most sensitive, best depth on sub-gram nuggets in light soils.

11" Round Monoloop Coil

Brilliant all-round coil, sensitive and stable.

15" x 12" Semi-Elliptical Monoloop Coil

Sensitive for its size, good for open areas and deep targets.

18" Round Monoloop Coil

Superb depth and sensitivity in low to medium mineralisation.

Choosing the Right Coil for the Job

Troubleshooting

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