Minelab GPX-4000 User Manual

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There is usually some merging of characteristics
between targets that are clearly ferrous and others
that are ‘maybe’ ferrous. Iron Reject allows you to
make fine adjustments in the determination of the
‘maybe’ signals.
A low level of Iron Reject will keep the discrimination
conservative. ‘Maybe’ targets will respond with a
normal non-ferrous signal and only definite ferrous
targets will cause the Threshold and target signal to
blank. If the target response is too weak for accurate
discrimination, the detector will give a normal target
signal until you dig closer to the target and the
signal strength improves.
A medium level of Iron Reject is a little less
conservative and will enable you to reject most
ferrous targets from the non-ferrous targets.
A high level of Iron Reject will be less conservative
again and more ‘maybe’ targets may be rejected as
ferrous targets, therefore giving a blanking signal.
With this setting some small non-ferrous targets,
e.g. gold coated ironstone could be mistaken
for ferrous targets.
Iron Reject
Rejecting Iron Targets
A low level of Iron Reject requires a stronger ferrous
signal before discrimination occurs. A high level of
Iron Reject will cause blanking on a smaller ferrous
targets. Very weak ferrous target responses will give
normal ‘all metal’ type signals.
Select the level of Iron Reject depending on how
cautious you want to be and how much trash is in
the area.
If the area is heavily littered, you may want to use
a higher level of Iron Reject. If there is little trash in
the area and it is mostly close to the surface you may
prefer a more conservative, low level of Iron Reject.
It is usually best to recover all targets, especially
when you are on a known gold producing site or a
successful patch. However, careful use of the Iron
Reject feature can be rewarding in areas other
operators have avoided.
Iron Reject will give the
best results when used
in combination with the
specially designed GP Series
or Commander Double-
D coils and will not work
when using Monoloop coils.
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Range
Factory Preset
Off (All Metal), 1 to 30
Off (All Metal)

Minelab GPX-4000 Specifications

General

Brand	Minelab
Model	GPX-4000
Category	Metal Detector
Language	English