Minelab X-Terra 705 Instruction Manual download pdf (Page 10)

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detector audioa simple detecting exercise

Target Response

(Metal Object Response)

This is the sound given by the detector when

a target is located and not discriminated

(rejected).

In Coin & Treasure Mode a highly conductive

target (e.g. a large silver coin) will generally

cause a high pitched beep and a ferrous target

will generally cause a low pitched beep.

In Prospecting Mode, a target will cause an

abrupt change in pitch and volume of the

Threshold tone. Detections are indicated by

sound only.

(Tones, p. 38)

(Sounds, p. 50)

False Signals

The detector may also produce False Signals

(Noise) when not over the ground or with the

coil held motionless. These may not be target

signals, but surrounding electromagnetic

interference (EMI). The Ground Balance and

Noise Cancel settings can be used to overcome

these false signals.

(Noise Cancel, p. 32)

(Ground Balance, p. 40)

Highly mineralised

soil may produce false

signals and distract

from real targets.

Don’t worry if the detector is not producing

a sound over the nail — this is because the

detector begins in the default Pattern 1, a

setting which rejects signals from common

junk targets, including ferrous targets.

Note: If you are getting signals from a clear patch

of ground, there could be buried metal objects.

Try nding another area.

If the detector is making popping and crackling

sounds, and displaying numbers when the

coil is not over one of the metal objects, try

reducing its Sensitivity (p. 30). Once stable, the

detector will sound and display numbers only

when the coil is passed over a target.

Buried metal objects are referred to as targets.

Before attempting to pinpoint or recover real

targets, it is important to understand how to

interpret the audio and visual signals of

the detector.

A good way to become familiar with detecting

is to test the detector with a range of metal

objects. This exercise is a simple lesson on how

the detector interprets metal objects.

Gather a collection of dierent metal objects,

e.g. various coins, gold and silver jewellery, a

nail, pull-tab, brass button and aluminium foil.

Take the detector outdoors, away from known

electromagnetic elds or metal objects.

Lay objects in a line, suciently spaced apart

to allow the coil to pass between the objects.

Pass the coil across the objects one at a time,

and observe the LCD and the sounds of the

detector as it detects each object.

This test exercise may be used when

adjusting the settings of the detector

(Sensitivity, p. 30; Threshold, p. 34;

Volume, p. 36; Tones, p. 38).

‘Blanking’ (No Sound)

Threshold

Threshold

Normal Signal

Threshold (Background sound)

This is the background ‘buzz’ produced by the

detector, used to help distinguish between

desired and undesired objects.

Blanking

When a rejected target is detected the

Threshold sound ‘blanks’ (becomes silent),

indicating that a target is located underneath

the coil but has been rejected by your

discrimination pattern. Blanking is a useful

way of distinguishing between desired and

undesired targets.

Nail Pull-Tab Foil Coins Jewellery

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