Page 24 The Minelab Eureka Gold
f) The Volume control is generally turned to maximum. The setting does
not affect the threshold level, but sets a limit on the loudest audio
signal produced. Test the volume comfort level by passing a piece of
metal over the coil. Adjust the Volume control to a comfortable level.
g) Adjust the Tone control to a pitch to which your ears are most
sensitive. This again allows you to have the threshold set to as low a
level as possible.
h) It is recommended that the Balance switch is set to either Fast Track or
Slow Track for general detecting. The Fixed setting can be used to hold
the ground balance in localised areas when it is suspected that small
targets are being balanced out (see Balance Switch on page 17).
Leaving the setting at Fast Track or Slow Track while detecting will ensure
that the Eureka Gold continuously adjusts itself to the
changing ground conditions. Note that sudden changes in the ground
conditions may still produce changes in the audio signal and
balancing may need to be repeated.
i) Move the coil up and down near the ground surface. This allows the
Automatic Ground Balance feature to set the
balance. Keep ‘pumping’ the coil until there is
no change in the audio signal accompanying
the movement (see Figure 17).
Figure 17 - Ground
Balancing
j) Start searching by slowly moving the coil
across the ground. Periodically check the
control settings to correct for any change in
the detector or soil conditions. Refer to
‘Detecting Techniques’ (see pages 26-30)
for details on finding targets.
Page 25 The Minelab Eureka Gold
8.2 Ground Balance
Generally speaking, without the ground balance of the detector being set,
passing the coil over an area of ground may produce signals whether or
not there are targets in the ground. Signals produced without the presence
of targets are due to the magnetic and/or mineralised nature of the soil.
To eliminate these unwanted signals the automatic ground balance of the
Eureka Gold must be enabled by switching to either Fast Track or
Slow Track. In these modes the Eureka Gold automatically adjusts its
ground balance.
When first turning the detector On, switch it to either Fast Track or
Slow Track and raise and lower the coil repeatedly over the ground until
the audio signal is constant.
In heavily mineralised ground, Fast Track will re-balance more rapidly and
therefore maintain a better ground balance, however, very weak target
signals could be eliminated if repeated sweeps are made across the
target. In less mineralised areas, Slow Track will maintain a good ground
balance without tracking out targets. Once a target has been located, the
detector should be put into Fixed for pinpointing and digging the target.
Note: It is possible for small targets to be balanced out if the detector coil is
swept repeatedly across the target. Once a signal is located, the Balance
switch should be changed into Fixed mode.
(19 pages)
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