Minelab Eureka Gold Manuel de service télécharger pdf (Page 10)

Page 16 The Minelab Eureka Gold

5.4 Frequency Switch

The Eureka Gold has three operating frequencies:

6.4kHz, 20kHz and 60kHz. Usually 6.4kHz is better suited

to larger, deeper gold nuggets while 60kHz is better for

smaller nuggets near the surface. The 20kHz setting is

best for general purpose detecting, or a happy medium

between both these extremes.

After changing the frequency setting, there will be a period of 2 seconds

when the detector will not detect any targets. Also, it might be slightly out

of ground balance, but the Automatic Ground Balance will quickly readjust

itself as you start sweeping the ground. If you want to make sure you don’t

miss any targets, you can ‘pump’ the detector as explained in the

Operating Instructions (see pages 23-25).

5.5 Signal Switch

The Signal switch provides three levels of audio response:

Normal, Fine and Boost. In the Normal position, a target

signal is uneffected. A change in the pitch and volume

helps to separate target signals from the background

threshold tone.

In the Boost position, the target signal is amplified, offering

The Fine position is specially designed to enable the detection of small

and medium size targets close to the surface, especially in mineralised

ground. It does this by amplifying and filtering the audio signal. This allows

the target signals to be amplified without amplifying the background

signals as occurs in boost mode. This mode may miss larger targets at

greater depths but will give greater sensitivity to smaller targets.

Excessive numbers of ‘hot rocks’ could make this mode undesirable in

some grounds.

extreme depth penetration in quiet soils or in an area with constant ground

mineralisation. You are likely to encounter some spurious noise if you search

in variable ground using the Boost setting. This mode is also useful to

pinpoint a target which gives a faint signal under normal circumstances.

Noisy (i.e. mineralised) ground will become even noisier if used in this

position. The signal will become even noisier if used in

conjunction with 60kHz.

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Page 17 The Minelab Eureka Gold

5.6 Balance Switch

The Balance switch selects either Automatic Fast Track

or Automatic Slow Track, or the Fixed ground balance

position. In the two automatic positions the Eureka Gold

is an Automatic Ground Balance detector. This means

that the detector continually adjusts itself to maintain

ground balance, which will ensure that your detector is

Fast Track being the faster ground balance should be used where the

ground is heavily mineralised or changes rapidly. For ground which is more

mild or reasonably constant in its mineralisation, use the slower

Slow Track.

It is important to know that a deep target may be ‘balanced’ out by

continual sweeping over it when pinpointing in the automatic modes. By

ground balancing next to the target then switching to the Fixed mode, the

target cannot be balanced out. For the same reason the Fixed mode is

recommended when locating targets once dug from the hole.

5.7 Mode Switch (Disciminate/All Metal)

The Discriminate switch allows the use of

the discriminator built into the Eureka Gold.

It has two positions: All Metal and

Discriminate. In the All Metal position, the

detector responds to all types of targets with

the same target response.

In the Discriminate position, the detector discriminates between ferrous

and non-ferrous targets. The discriminator generally performs best on loud

signals. Its ability to Discriminate between ferrous and non-ferrous targets

may be affected by the depth and size of a target. Ferrous targets will be

signalled by a blanking of the audio threshold. Using the Eureka Gold

discriminating mode will not sacrifice sensitivity or depth, but it will not

necessarily discriminate to the full depth at which the target can be

detected.

searching to its greatest possible depth at all times. Fast Track causes

the ground balance to respond rapidly to changing ground conditions, while

the Slow Track setting responds at about half this rate.

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Minelab Eureka Gold Manuel de service Page 10

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