Nexus Ultima User Manual page 6

Having assembled the Nexus Ultima, inserted batteries and connected the
headphones, the detector is ready for use.
First ensure that no metal is in close proximity to the coil. It is also
advisable to carry out the tuning and setting up of the Nexus Ultima away
from other detectors or potential sources of electronic interference.
Click the On-Off switchon the control box to turn the Nexus Ultima on. A
tone will be heard and the meter needle will kick. The tone will fade after 2 -
3 seconds. If the initial tone sets for much longer than 3 seconds that will
indicate Low Battery Condition.
Holding the Nexus Ultima with the coil well above ground level, adjust the
Gain control knob to minimum. Adjust the Threshold knob to obtain a
minimal tone setting. Adjust the Volume knob to set a comfortable level.
Lower the coil to the ground and sweep slowly to ensure that there are no
metal targets in the place you are tuning the detector. When you are
satisfied that no metal is in the ground where you are standing, the
procedure for tuning can be started.
There are two basic ground balance tune modes for Nexus Ultima when it
is equiped with the dual 20" Ultima search coil.
MODE 1.
Position the coil on the ground surface. Raise the coil gently to about 4 or
no more than 5 inches above the ground and lower back to the ground
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. If the Meter needle moves while raising and lowering the
search coil to the ground, that indicates inaccurate Ground Balance
adjustment.
After this Ground Balance procedure is complete the working zone for
Nexus Ultima above the ground surface will be from 0 to 5 inches. In this
mode of Ground Balance adjustment the Nexus Ultima will retain relatively
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