Minelab GPX-4000 Service Manual download pdf (Page 33)

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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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/POGFSSPVT

)PSTFTIPF #SPLFOSVTUZUJO *SPOTUPOFDPBUFEOVHHFU $MFBOOVHHFU $PQQFSDPJO/BJM

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Range

Factory Preset

Off (All Metal), 1 to 30

Off (All Metal)

1 2 ... 28 29 30 31 32 33 34 35 36 37 38 ... 46 47

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Minelab GPX-4000 Service Manual Page 33

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