IRON DISCRIMINATION
Iron Discriminate
Figures 5.4, 5.5
Iron discrimination with the GP 3000 is the silencing or ‘blanking’ of the
threshold which occurs when the detector determines a target is
comprised of ferrous metal.
There is no discrimination when Iron Discrimination is set to All
Metal. Targets will cause the tone and volume of the threshold to vary.
These variations convey no consistent information about the type of
metal detected.
Iron discrimination operates when Iron Discriminate is set to Disc.
Objects must produce sufficiently strong target responses for the detector
to successfully discriminate. Fortunately, most iron rubbish is located near
the surface and should produce the required strong signal response.
NOTE When Disc is used, small or deeper targets, whether
ferrous or non-ferrous, will produce a normal target signal.
If a target response is too weak for the detector to discriminate, it will
internally change to the all metal mode. As soon as the target response
becomes strong enough, the detector will resume discrimination.
Pinpointing is best performed using All Metal.
HINT When a target has been located using Disc, the coil should
be rapidly passed back and forth over the target centre several
times. Remember to set Ground Balance to Fixed for this.
The coil should always be passed smoothly over the surface of the
ground, while maintaining the coil height above the ground. This is
especially important when attempting to discriminate a target.
When detecting a piece of iron, a normal target signal should be heard
until the detector determines that the object is ferrous.
At this point, the signal will 'blank'.
The strength of the target response required for discrimination to occur
may be altered by using Level Adjust.
Figure 5.4 A normal signal on a non-ferrous
target.
Figure 5.5 Discrimination target signal on a
ferrous target.
36
OPERATION
5
P0514-A
Louder
Normal Signal
P0514-B
Louder
“Disc” Ferrous
Response Blanking
NOTE
Discrimination will give the best
results when used in combination
with the specially designed GP 3000
coils.
Discrimination will not work
correctly when using mono coils.
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