Minelab 4901 - 0059 quick start Activating Target ID Stability, Ferrous Non-ferrous, From another

20TARGET ID

PATTERN DISCRIMINATION SCALE 21

Buried metal objects are referred to as targets. Target signals contain ferrous and conductivity information.

As the coil is passed over a target, the detector digitally processes the target signal and displays this as a number.

Target Identification (ID) is used to distinguish one type of metal target

from another.

Target ID numbers range from -8 to 48. Negative numbers represent ferrous targets and positive numbers represent non-ferrous targets.

The last detected Target ID stays on the display until another target is detected. If the detector passes over a target that it rejects, the display will show two dashes instead of a number.

Target ID Stability

Target ID

The numeric identifier of a particular metal object underneath the ground.

Discrimination segment

Each segment refers to a certain type of metal signal. Segments can be turned off (to accept targets) or turned on (to reject targets), accepting or rejecting signals from the corresponding metal objects.

A grey icon on the diagrams in this manual represents a flashing icon on the detector.

In addition to the Target ID, targets are also represented as a particular segment on a linear scale at the bottom of the display.

Each discrimination segment represents a level of conductivity and ferrous content.

Non-ferrous targets are those that have no iron content, such as gold, silver, copper and bronze. Non-ferrous targets are often higher in conductivity and are represented by the right-hand side segments.

Ferrous targets are those that contain iron (e.g. nails). They are generally magnetic and are represented by the left-hand side segments.

Desired and undesired targets may appear anywhere along the discrimination scale, e.g.

Desired ferrous target - Canadian coin Undesired ferrous target - iron nail Desired non-ferrous target - gold coin Undesired non-ferrous target - pull-tab

Discrimination segments may be turned on or off, rejecting or accepting certain

targets, respectively (Editing Discrimination Patterns, pg. 25).

The X-Terra 70 has a fine Discrimination Scale, but this may result in some instability of the displayed Target ID in some areas with highly mineralised soil.

In these cases, the Target ID numbers may be further stabilised by using the Target ID Stabiliser. The Target Tone may not always match the stabilised Target ID.

Activating Target ID Stability

In the detection screen, press and hold MODE AUTO for three seconds. Theicon will appear, indicating that Target ID Stability is activated.

To de-activate Target ID Stability, press and hold MODE AUTO for three seconds. Theicon will disappear, indicating that Target ID Stability is de-activated.

Press and hold to activate/de-activate Target ID Stability.

Many of the screen diagrams in this manual refer to the X-Terra 70 operating in the default Coin & Treasure Mode.

4 ferrous 24 non-ferrous

The X-Terra 70 has 28 ID segments.

The target ID’s range from -8 to 48, increasing in steps of 2.

Rejected segments appear as black, accepted segments disappear altogether (allowing signals from metal objects). The combinations

of accepted and rejected segments are called Discrimination Patterns.