Frequency Switch; Signal Switch - Minelab Eureka Gold Instruction Manual

Page 4
5.4

Frequency Switch

P0216-B
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

P0217-B
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.
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.
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.
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 Minelab Eureka Gold