Minelab Excalibur II Instruction Manual download pdf (Page 11)

16 17Detecting Basics

Blanking

When sweeping over a rejected target, the threshold

‘blanks’ (becomes silent) indicating that a target is located

underneath the coil, but has been rejected by you. Blanking

is a useful way of distinguishing between desired and

undesired targets. (pg. 29)

Discrimination

Discrimination is the ability of a metal detector to identify

the user’s desired target (e.g. jewellery) and eliminate signals

from undesirable material (e.g. nails). The Discriminate

control allows you reject or 'ignore' certain targets. (pg. 28)

Electrical Interference

The detector may also produce sounds when the coil

is not over a target. These signals are caused by nearby

electromagnetic sources such as power lines and

phone towers. (pg. 19)

Ground Noise

The detector may also produce various random signals

caused by different minerals in the ground, sometimes

referred to as false signals. (pg. 19)

Targets

Buried metal objects are referred to as targets. Targets are

comprised of both ferrous and non-ferrous metals.

Target Response (Metal Object Response)

This is the term given to the change in the volume (and pitch

in Disc mode) of the threshold when a target is detected and

not discriminated (rejected).

Threshold (Background Sound)

This is the background sound produced by the detector.

When a target is detected, the threshold changes in volume

(and pitch in Disc mode). Listen to the threshold carefully.

Concentration is an important part of detecting. A very

deep or small target may only give a minor change to

the threshold. (pg. 22)

Common Terms

The Excalibur II is a ‘motion’ detector. This means that the

coil must be 'moving' over a target to detect it.

If the coil is held stationary over a target the detector will

not give a response.

The Excalibur II will perform at its best when the coil

is kept close and parallel to the ground, beach, river/

sea bed at all times. This will increase detection depth,

response to small objects and help prevent false signals.

Practise sweeping the coil over the ground in a side-to-

side motion, while walking forward slowly. At the end

of each sweep slightly overlap the previous sweep to

ensure full ground coverage. An average sweep speed

is four seconds from left to right to left. If you sweep too

fast your discrimination accuracy will suffer and you may

miss deep targets. A variation in coil height at the end

of each swing may cause confusing sounds and reduce

detection depth, so an even, flat sweep is desirable.

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Minelab Excalibur II Instruction Manual Page 11

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