Minelab Eureka Gold Manual de Serviço descarregar pdf (Página 13)

Page 22 The Minelab Eureka Gold

7. Detector Sounds

There are seven types of sounds that the detector will produce:

••

• Threshold Signal — A low-level, constant audio hum which is present

at all times, even when the coil is held motionless.

••

• Target Signal — Small or large variations in the volume and pitch

generally indicate metal targets.

••

• Iron Signal — When the Discriminate switch is set to Discriminate,

ferrous targets will be signalled by a blanking of the Threshold

signal.

••

• 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.

••

• 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.

••

• Low Battery Signal — A sharp ‘pip’ occurs approximately every

12 seconds when the useful charge of the batteries is near its end.

••

• 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.

Page 23 The Minelab Eureka Gold

8. Operating Instructions – Fundamentals

The Eureka Gold is a motion detector and must be moving over a target to

be able to detect it. If the coil is held still for a few seconds, any signals due

to ground or targets will die away. The Eureka Gold is designed to be

sensitive to a large range of targets while also having the ability to

discriminate between ferrous and non-ferrous targets.

When in use, the detector should have the Threshold control set so that

there is a soft but audible signal at all times. Any variation in this signal as

the coil is moved over ground can indicate the presence of a metallic

target. It could also, however, be due to sudden large variations in soil

conditions for which the automatic ground balance cannot compensate

quickly enough. Such differences can be learned through experience.

8.1 Operating the Eureka Gold

a) Remove the components from the carton and assemble the detector.

b) Ensure the battery is fully charged.

c) Turn the Eureka Gold On using the Volume control. To extend the battery

life, avoid leaving the detector On unnecessarily.

d) Adjust the Threshold control until the audio signal is just audible when

the coil is held motionless. It must be audible, as small targets might not

produce enough signal to make any sound if the background sound is

too quiet. However, if the threshold hum is too loud, small variations

might also be missed because they are too small compared with the

background sound.

e) Once the initial turn-on noises have subsided, turn the Sensitivity

control to maximum then rest the coil on the ground. Once again, after

a few seconds, the noises due to the movement will die down. If there

are any residual noises, they will be due to electrical interference with

the detector. You will need to slighly decrease the Sensitivity control

until the interference noises are stable. Reduction of sensitivity

reduces the ability to detect targets, so the sensitivity should be

reduced as little as possible.

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