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The GPX-4000 is capable of rejecting many iron/
ferrous targets while still detecting non-ferrous
targets.
While detecting in littered goldfields, much of the
iron rubbish may be ignored, with a high probability
that valuable targets will not be missed.
When Iron Reject is turned off , no iron targets
will be rejected, therefore all types of metals
will produce a target response. This is known as
'All Metal' and is the preferred setting for most
situations.
In All Metal, the detector will give varying volume
and pitch signals. This information does not indicate
the type of metal in the object.
If Pinpointing a target prior to digging, best results
will be obtained from turning Iron Reject Off.
Iron Reject Off (All Metal)
Accepting all Targets Types
When Iron Reject is activated, iron or ferrous objects
are rejected by blanking the normal target signal, so
that the Threshold Tone goes silent as the coil passes
across the target.
Discrimination is dependent on target signals being
strong enough for the GPX-4000 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 due to a hole being dug
and the coil getting closer to the target. The Iron
Reject function is designed this way for maximum
accuracy.
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.
"MM.FUBM
'FSSPVT5BSHFU
"VEJP4JHOBM
/PO'FSSPVT5BSHFU
%JTDSJNJOBUJPO#MBOLJOH
"VEJP4JHOBM
#MBOLJOH4JHOBM
'FSSPVT5BSHFU
/PO'FSSPVT5BSHFU
When a target has been
located, the coil should be
passed back and forth over
the target centre several
times. Remember to set
Ground Balance to Fixed
for this and keep the sweep
across the target at an even
height and as close to the
ground as possible.
For deep targets, the hole
being dug may not be
wide enough for the coil
to move sideways across
the target. Therefore the
discrimination may not
be accurate. You should
always test the target from
at least two directions (90˚
to each other) so that the
detector 'sees' the target
from different profiles.
Range
Factory Preset
Off (All Metal), 1 to 30
Off (All Metal)
