Page 3 The Minelab Eureka Gold
7. Detector Sounds
There are seven types of sounds that the detector will produce:
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• Threshold Signal — A low-level, constant audio hum which is present
at all times, even when the coil is held motionless.
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• Target Signal — Small or large variations in the volume and pitch
generally indicate metal targets.
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• Iron Signal — When the Discriminate switch is set to Discriminate,
ferrous targets will be signalled by a blanking of the Threshold
signal.
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• Overload Signal — A high-pitched squeal indicates the presence of
a very large target or very highly mineralised ground. To overcome
this, raise the coil and test the area again. If mineralised ground is the
problem, re-ground balance or try a different signal setting.
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• Discriminator Overload Signal — A loud ‘bell-ringing’ sound
indicates that the Eureka Gold has detected a signal too large for the
discriminator to process accurately. To overcome this, raise the coil
from the ground, so that the signal from the target is weaker.
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• Low Battery Signal — A sharp ‘pip’ occurs approximately every
12 seconds when the useful charge of the batteries is near its end.
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• Ground Noises — When passing across rapidly changing
mineralised ground, ‘ground noises’ may be heard. These are often
more like long growls than the normal short, sharp target signals. They
are often heard when the coil passes across the area from one
direction only. The sound is often not heard from the reverse sweep.
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