CS-990 GB
2
Inland Mineralised Sites :
The G 1 mode is the mode in which "Ground Exclusion" is achieved on the majority of inland sites.
Beach and Non-Mineralised Inland Sites :
The G 2 mode enables the detector user to ground exclude on wet salt sand beaches by using the
variable ground exclude control knob identified as "LEVEL", positioned directly above the ground
exclude control knob G 1 & G 1. The G 2 mode also enables the operator to use the detector for
total iron rejection on non-mineralised inland sites.
DISCRIMINATION (Rejection)
What is discrimination ?
It is an obvious advantage when metal detecting to get different signals for worthwhile as opposed
to worthless objects, and therefore be able to discriminate or differentiate in various ways. Basically
a rejected item will cause the signal to fall. The meter needle will drop to the left, and the sound
level will die away and/or decrease in frequency. On the other hand, a good target object will cause
the signal to rise. The meter needle will move to the right and the sound level and frequency will
increase.
The full discrimination facilities of this detector will be described in more detail under the heading
"OPERATING THE DETECTOR IN THE FIELD".
If an object is very close to the search head, conflicting signals may occur. These signals are
characterised by hard swings of the meter needle from left to right. If you encounter such problems
you should raise the search head a few inches (10 cm), retune and rescan. You should now receive a
clear signal.
These anomaly signals are caused by the object overloading the signal. Normally iron fragments or
wire on the surface cause this phenomenon.
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