Operation - Nexus Ultima User Manual

Voltage Controlled Oscillator (VCO)
This knob turns on or off the VCO and it also sets the frequency pitch for
the target responses. Using the VCO will result in small loss of depth
penetration, but it will
make the use of the detector easier. If the VCO is turned on the Threshold
level will have to be readjusted.
Threshold
This knob sets the level of the threshold tone. The Nexus Ultima may be
operated in silent mode, with no audible background tone or with this tone
set to give a slight tone level. In order to readily discern the faintest and
smallest of signals, operation with a slight background tone is
recommended.
Sensitivity
This knob controls the level of sensitivity of the responses. The sensitivity
level setting will depend on the soil conditions but, in general, low
sensitivity setting is recommended. On contaminated or highly mineralised
sites, it may be necessary to reduce the sensitivity to avoid excessive
amount of signals.
Volume
This knob sets the volume of the tone and audio responses. This knob
should always be used for setting the volume. Any volume control on the
headphones should be set to MAXIMUM.
Discrimination Mode Toggle Switch
Located under the meter box and accessible from the hand-grip, this toggle
switch is used to change modes. When pushed forward, the detector
operates in Discrimination Mode. In the centre position, the detector
operates in All-Metal Mode. The final position is for Discrimination Mode
again and is spring-loaded held towards the user to give temporary access
to the Discrimination Mode. On releasing this last position, the switch will
automatically revert to the centred position, All-Metal Mode setting.

OPERATION

No metal detector, however powerful, will operate at its best unless it is set
up properly for the conditions in which it is to be used. To obtain the best
results, maximum depth and sensitivity to desired targets, the Nexus Ultima
must be properly tuned to the site.
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