Nexus Ultima User Manual page 7

high sensitivity to large coins (30mm) and similar to their size or smaller
other targets. If you do not wish to detect relatively small targets please
follow MODE 2 of Ground Balance adjustment.
MODE 2.
Position the coil around 5 inches (12 cm) above the ground surface. Raise
the coil gently to around 12 inches (30 cm) and lower back to 5 inches hight
and repeat this movement several times.
Note whether the threshold tone remains the same or if it increases or
decreases while raising and lowering the coil. If the tone rises when
LOWERING the coil towards the ground, then adjust the Ground Balance
knob slightly in an anti-clockwise direction. If the tone rises when LIFTING
the coil away from the ground, then adjust the Ground Balance knob
slightly in a clockwise direction. Repeat this procedure to ensure that an
accurate assessment of the tone is obtained. If the tone remains constant,
then the ground balance is set properly. To achieve the best ground
balance tuning, it is essential that the coil be held parallel to the ground
surface at all times during the procedure. If the Ground Balance is not
properly adjusted the Meter needle will move to the left or to the right in
some cases.
After this Ground Balance (MODE 2) procedure is complete the working
zone for Nexus Ultima above the ground surface will be from 5 to 20
inches.
In this adjustment mode the Nexus Ultima will loose some of its sensitivity
to small targets, but the sensitivity to large deep targets and hoars will
remain.
The next stage is to adjust the sensitivity to suit the site conditions. From
the minimum setting of the Sensitivity knob used in the initial ground
balancing procedure, adjust the Sensitivity knob clockwise to increase the
sensitivity.
Repeat the procedure of raising and lowering the coil, as for ground
balancing according to the chosen Ground Balance mode. If there is no
change in tone while doing this, then the sensitivity may be increased
further. For best results, the gain setting should be at the maximum
possible (fully clockwise). However minimum level of the Sensitivity setting
is recommended for new Nexus users. At maximum sensitivity settings, a
slight tone change may be noted when both raising and lowering the coil.
This will not adversely affect the operation of the Nexus Ultima, providing
that the coil is kept at a reasonably constant level above the ground surface
and parallel to it while detecting. Each Nexus metal detector is supplied
with a scale positioned around the Discrimination knob. Rotating the
Discrimination knob CLOCKWISE (Accept) will REDUCE the discrimination
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