Iron Reject Off (All Metal) / Accepting All Target Types - Minelab GPX-4000 Quick Start Manual

58 Iron Reject Off (All Metal)
Accepting all Targets Types
Range
Factory Preset
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.
Off (All Metal), 1 to 30
Off (All Metal)
When a target has been When Iron Reject is activated, iron or ferrous objects
located, the coil should be are rejected by blanking the normal target signal, so
passed back and forth over that the Threshold Tone goes silent as the coil passes
the target centre several across the target.
times. Remember to set
Discrimination is dependent on target signals being
Ground Balance to Fixed
strong enough for the GPX-4000 to determine if the
for this and keep the sweep
target is ferrous or non-ferrous. If the signal is weak,
across the target at an even
the detector will give a non-ferrous response until
height and as close to the
the signal becomes stronger due to a hole being dug
ground as possible.
and the coil getting closer to the target. The Iron
Reject function is designed this way for maximum
For deep targets, the hole
accuracy.
being dug may not be
wide enough for the coil Caution: Do not attempt to discriminate by raising
to move sideways across and lowering the coil on a deep or partially dug
the target. Therefore the target. An accurate discrimination requires an even
discrimination may not side-to-side coil motion.
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.
59