Minelab GP 3500 Instrukcja Obsługi Pobierz pdf (Strona 22)

THE MINELAB ‘GP extreme’

OPERATION

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IRON DISCRIMINATION

Iron Discriminate

Figures 5.4, 5.5

Iron discrimination with the ‘GP extreme’ 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 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.

NOTE Discrimination will give the best results when used in

combination with the specially designed

‘GP extreme’ coils.

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.

P00514-A

Figure 5.5 Discrimination target signal on a

ferrous target.

P00514-B

THE MINELAB ‘GP extreme’

OPERATION

Level Adjust Control

Level Adjust gives the user the ability to select the sensitivity and

likelihood of a target being discriminated as ferrous when used in

the Disc mode.

This may also affect how the detector responds to ground

mineralisation compared to metal targets when used in Disc. Mode.

There is usually some overlap between signals from useful targets

and some types of iron rubbish. The user may set Level Adjust to

select the amount of discrimination between two extremes:

• (Fully anti-clockwise). All targets detected, but some iron will

give a normal signal (as per Figure 5.4).

• (Fully clockwise) Little iron detected, but some small non-

ferrous targets potentially mistaken as ferrous.

Turning the control anti-clockwise increases the strength of a signal

required for iron discrimination to be activated.

The Level Adjust also affects the Tracking mode.

When set fully clockwise, it is unlikely the detector will 'balance out

genuine targets, but some ground noise may still give false signals.

When set fully anti-clockwise, the detector will 'balance out' ground

noise effectively, but some faint, weak target signals may be missed

after repeated sweeps of the coil.

HINT It is usually best to dig out all targets and only use the

discrimination function in areas where a large amount of rubbish

makes the digging of everything impractical.

NOTE Discrimination functions will only work with strong,

positive target responses. Weak responses will give normal

'all metal' type signals.

IRON DISCRIMINATION

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