Minelab SD2200V2, Instruction Manual

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Page 10 The Minelab SD2200v2
4.2 Front Panel Controls
4.2.1 Ground Balance Mode ( Fixed or Tracking )
To get the best from your SD2200v2, it is important to know how different
ground conditions affect the detecting process. Ground contains not only
sand, but also many different chemicals, minerals and salts. These extra
components are referred to as ground mineralisation. This ground
mineralisation will often produce a sound from the detector, known as
“ground noise”.
The
SD2200v2 has the ability to cancel out the effects of ground
mineralisation so that it minimises ground noise, while retaining maximum
sensitivity to metal targets. Cancelling out the effects of ground
mineralisation is referred to as “ground balancing”. This ensures that
welcome signals from objects such as gold are not confused with
unwelcome ground noise. The SD2200v2 has automatic ground balance
which adjusts to minimise the effects of ground mineralisation when set in
Tracking mode.
4.2.2 Iron Discriminate Switch ( Disc, All Metal, Disc + ID )
This switch allows you to select between simple discrimination
( Disc mode) and discrimination with tone identification ( Disc + ID mode),
or to turn off the discrimination altogether ( All Metal mode). In the case of
All Metal mode, the detector will give varying volume and pitch signals but
this information does not indicate the type of metal in the object found. In
Disc mode, a strong signal from a ferrous (iron) object will cause the
threshold to be ‘blanked’ or silenced.
In
Disc + ID mode, a strong signal from a ferrous object will cause the
threshold to be ‘blanked’, just as it does in Disc mode. In addition, a signal
of medium strength will trigger the ID mode. In this mode, non-ferrous
objects usually produce a tone with a steady pitch while a ferrous object
will usually produce a tone with a varying pitch. Repeated sweeps across
the target might be required to confirm whether the tone is steady or varying.
Note, however, in this mode some non-ferrous objects can also produce a
tone with varying pitch, making the operator more likely to mistake a
non-ferrous object for a ferrous object. This mode of discrimination should
not be trusted until the operator has sufficient experience with listening to
the tones produced and comparing them with the objects detected.
Instruction Manual Page 11
If the signals are too weak for accurate discrimination in either of the
discriminating modes, the detector will return to the All Metal mode signal.
While in the Disc + ID mode, a signal which is too strong to be discriminated
will produce a rapidly pulsing signal with constant pitch. This is called an
overload signal. A target producing this sound should not be interpreted as
being a ferrous target but be investigated.
4.2.3 Discrimination Level Adjust
The discrimination Level Adjust gives the operator the ability to select the
sensitivity and likelihood of a target being ferrous or non-ferrous. The same
control also affects how the detector recognises mineral effects in the
ground as opposed to metal targets, when ground tracking.
Figure 4 - Front Panel Controls