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The Minelab SD2100v2
5.2
Operating Instructions
5.2.1
Detector Sounds
Threshold: This is the background sound produced by the detector. The
loudness of the background sound is set with the Threshold control. Set
this so that you can just hear it. The pitch of the threshold sound can be
set to your preference using the Tone control. The threshold tone of the
SD2100v2 will not drop below the level set with the Threshold control.
Object signal: This is an abrupt change of the threshold tone, volume,
and pitch. If the pitch drops first, then rises as the coil is passed over a
target, this generally indicates a small target. If the pitch rises first then
falls as the coil is passed over a target, this generally indicates a large
target.
Ground noise: These irregular noises are difficult or impossible to pinpoint
when moving the coil over the ground. They are caused by changing
chemistry or ‘mineralisation’ of the ground. Ground noise can be minimised
by the correct setting of ground balance controls (see section 5.2.6 Ground
Balancing).
5.2.2
Turning on the SD2100v2
Hold the coil away from the ground and any metal objects and switch the
Power switch to “On”.
5.2.3
Set the Threshold Control
The Threshold control should be set so that the background tone is barely
audible. Small surface objects, as well as large deep objects, will produce
very small changes in the threshold tone. It is important to set the Threshold
control correctly to ensure that these targets are heard. Minelab suggests
that you experiment with known targets to assist in setting the Threshold
and other controls to suit your hearing.
5.2.4
Set the Tone Control
Carefully adjust the Tone control until the background threshold tone is at
a comfortable pitch for your hearing. Note that interpretation of the detection
signals involves understanding the difference between the rising and falling
pitch of the threshold tone. Take time to experiment with known targets.
Generally, high pitch tones are more fatiguing but better for identifying the
faintest signals.
