The Nexus Standard SE is an Analogue Induction Balance (IB) metal detector which operates in very low frequency (VLF) range and designed for
Inland Sites. It can be used in salt-water conditions. It may be used in either of the following basic modes of operation; All-Metal, Discriminate,
Voltage Controlled Oscillator or combination between them.
The Nexus Standard SE is designed to be a general-purpose metal detector, capable of finding small and large targets at extreme depths.
The standard coil is the dual 9” This is ideal for most searching operations. A number of accessory search coils are available for optimum
performance when searching for the tiniest targets in difficult conditions or performing a general field search. All coils are capable of finding the
largest and smallest targets.
To obtain best results with Nexus Standard SE, as with all metal detectors, it is essential to understand the settings and operation. Some
experience in metal detecting will be beneficial and the Nexus Standard SE is not recommended for beginners.
Users will need to practice and experiment in order to obtain the best results on any particular site. All sites and soils are different and settings that
will give good results on one site may be less successful elsewhere. The Nexus Standard SE is designed to detect the very deepest of targets and
operates near to the limits of what is achievable with induction balance.
Each Nexus Standard SE is hand-built so that there may be minor cosmetic differences between individual units. Each search coil is tuned to a
slightly different frequency within the design range, to minimize interference from other Nexus detectors. Performance values for all Nexus
Standard SE detectors will be identical.
The Nexus Standard SE is supplied ready assembled, with the telescopic stem retracted. To prepare the Nexus for use, simply extend the lower
stem section.
By holding the two rubber washers together with the stem joint, slacken the coil to stem joint bolt slightly and adjust the coil angle to the stem so
that, when holding the Nexus for searching, the coil is parallel to the ground surface. Tighten the coil bolt by hand. Ensure that the search coil
cable is reasonably tight all the way over the stem, but not strained. Check that the coil connector plug is fully inserted into the socket on the back
panel of the control box.
The Nexus Standard SE is supplied with 10 AA dry cell alkaline batteries. Remove the four cross-head screws from the base panel of the battery box
(the battery box is below the arm rest at the top of the detector stem). Lift off the cover and insert the batteries, in their correct alignments, into the
plastic holder. Make sure that all the terminals have a good electrical contact. Locate the battery holder into the compartment, ensuring the
connecting cable is not strained or pinched. Do not over-tighten the screws.
Connect the headphones to the 6mm jack socket on the battery box. The Nexus Standard SE does not have an internal loudspeaker so
headphones are essential. For any headphones that have a volume control, ensure that this is set to MAXIMUM and use the Nexus Volume knob to
set the volume level.
The Nexus Standard SE has seven primary rotary control knobs. Six of them are located on the front of the control box. One of them is on the back
of the Meter box.
The Power switch is located on the front of the control box. It is combined with the Volume Control knob. It turns the detectors on or off.
The meter provides visual discrimination analysis in all modes. The Meter Sensitivity control is a rotary knob on the back side of the meter housing.
It controls the strength of the meter needle reaction.
The Discrimination knob sets the level of the discrimination. Rotating the Discrimination knob clockwise (Accept) will DECREASE the level so that
more iron is detected. Generally, the discrimination level should be set as low as is possible to avoid masking the smallest and deepest targets.
The Voltage Controlled Oscillator (VCO) knob turns the VCO on or off 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.
The Ground Balance knob is used to set the balance of the Nexus Standard SE to suit the soil conditions on a site.
The Threshold knob sets the level of the threshold tone. The Nexus Standard SE 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 signals, a slight background tone during
operation is recommended.
The Volume knob sets volume of the tone and responses. This knob should always be used for setting the volume. Any volume control on the
headphones should be set to MAXIMUM.
The Sensitivity 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 sensitivity to avoid excessive
amount of signals.
The Mode Toggle Switch is 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.
No metal detector will operate at its best unless 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 Standard SE must be properly tuned to site.
Having assembled the Nexus Standard SE, 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 away from other
detectors or potential sources of electronic interference.
Click the On-Off switch on the control box to turn the Nexus 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 it indicates Low Battery Condition.
Holding the Nexus with the coil well above ground level, adjust the Gain control knob to minimum, then adjust the Threshold knob to obtain a
minimal tone setting. Now adjust the Volume knob to set a comfortable level. Lower the coil to the ground, sweep slowly to ensure that there are
no metal targets in the place you are tuning Nexus. When you are satisfied that no metal is in the ground where you are standing, the procedure
for tuning can be started.
Position the coil aproximately 2” above and parallel to the ground surface. Then raise the coil gently to about 10” above ground and lower back
to 2” above 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, 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, the ground balance is set properly. To
achieve the best ground balance tuning, it is essential for the coil be held parallel to the ground surface at all times during this procedure. If the
Ground Balance is not properly adjusted the Meter needle will move to the left or to 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.
The next stage is to adjust the sensitivity to suit site conditions. From the minimum setting of Sensitivity knob used in the initial ground balancing
procedure, adjust the Sensitivity knob clockwise to increase sensitivity.
Repeat the procedure of raising and lowering the coil between 2” and 10” above the ground surface, as for ground balancing. If there is no change
in tone while doing this, 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 raising and lowering the coil. This will not adversely affect the operation, providing that the coil is kept at a reasonably constant
level above ground surface and parallel to it while detecting.
Each Nexus metal detector is supplied with a scale which is positioned around the Discrimination knob. Rotating the Discrimination knob
CLOCKWISE (Accept) will REDUCE the discrimination level and INCREASE the sensitivity to smaller ferrous signals. Rotating the Discrimination
knob ANTI-CLOCKWISE (Reject) will INCREASE the discrimination level and DECREASE the sensitivity to some non-ferrous targets and result in
desired targets being missed.
To obtain best Discrimination setting please follow the following procedure:
An iron nail (rusty if possible) around 2” long is required. While the detector is on, turn the Discrimination knob fully clock wise (accept). Now push
the Discrimination mode toggle switch forward (Iron rejection mode). Then begin to move the nail from side to side across the windings, pointed at
90 degrees against the middle of the coil. The nail should be pointed to the coil with its peak side at no more than 11/2” distance. In this case the
nail will be detected as a non ferrous target. While moving the nail side to side, begin turning the Discrimination knob slowly anti-clock wise, until
the tone in headphones change from clear to clicking. The position of the Discrimination knob in which the signal from the nail begins clicking is
best Discrimination level for all Nexus metal detectors. Having the scale around the Discrimination knob will make it easy to remember the
optimum level setting, finally, check again the threshold and volume settings for comfortable levels.
The Nexus Standard SE is ready to use. The coil should be swung smoothly and quite slowly (approx. 1,5 second per swing) from side to side
above the ground surface. It is ineffective to rub the coil on the surface of the ground. The Minimum suggested operating heights for the standard
coils are: 9” coil: 2” minimum above ground surface, 6” coil: 1½” minimum above ground surface, 4” coil: 1” minimum above ground surface.
Ensure the coil is swung evenly over and parallel to the ground surface and that the coil does not rise at each end of the swing. Cover the ground
in smooth, parallel swings to ensure maximum ground coverage. During normal search, the meter needle should remain stable or negligible, small
movements could occur. The Meter is only used for Target Analysis of audio responses in any mode. When detecting in Discrimination Mode, it
isn't necessary to use the meter as the audio discrimination provides sufficient Target Analysis.
In All-Metal Mode, both ferrous & non-ferrous targets will give the same audio response by a sudden increase in the intensity of threshold tone. A
strong response indicates a large or relatively shallow target and weak response indicate a small or deep target. Any audio signal in All-Metal
Mode may be analysed by using the Meter. To analyse a signal with the Meter, sweep the coil slowly across the target and observe the meter
needle response. The meter needle will kick to the right for non-ferrous targets when the audio signal is heard. The meter needle will kick to the
left for ferrous when the audio signal is heard.
In Discrimination Mode, good non-ferrous targets will give a clear, well-defined two-way repeatable audio signal. Ferrous targets will give a
‘clicking’ audio response or indistinct and erratic response.
Pinpointing is carried by simply X-ing the coil across the signal. The position where the signals are strongest indicates where the target is buried.
As with all detectors, when targets are of complex shape or are located at an angle in the soil, pin-pointing may not be entirely accurate.
In VCO Mode the pitch of the sound will get higher for non-ferrous targets and lower for ferrous targets. The exact amount of pitch change can be
set by turning the VCO knob.
Turning to the setting to 10 will result in highest possible audio pitch for the non-ferrous targets and the audio difference between the ferrous and
non-ferrous target responses will be most definite.
All metal detectors are precision instruments and require careful handling to ensure they remain in good working order.
The Nexus metal detector should not be used in wet weather conditions, ie. heavy rain, without protecting the control box, battery box and meter
housing. The coil assembly is fully waterproof.
Avoid dropping, impacts or violent shaking of the detector and protect it while transporting.
If water penetrates any of the boxes, switch the detector off and remove the batteries. The detector should be placed in a warm place to dry out
slowly.
When storing the detector for long periods or when shipping, the batteries should be removed.
Avoid storing in areas where it will be exposed to extreme temperatures, moisture, dust or contaminants.
Mud and soil should be removed carefully, using a damp cloth or water only, do not use detergents or abrasives and avoid getting water in the
control boxes.
Do not attempt to modify or repair the detector or allow a unauthorised repair centre to do so.
The Nexus Standard SE may seem different in operation to some present detectors. Some practice and experimentation with the settings are
necessary to get optimal results on different sites.
Work slowly when detecting. Sweeping the coil too fast over the ground will result in missed signals. It must always be remembered that no
detector can find what is not there nor can a detector give a signal unless the coil is passed directly over the target.
Users should persist and regular use over a few weeks is likely to be needed to become proficient, especially in detecting the deepest and smallest
targets.
Site conditions will significantly affect depths and performance. Heavily
furrowed or broken ground or thick stubble is difficult. Sites where the ground conditions vary to a considerable degree may require the Ground
Balance to be adjusted for optimal results.
The Nexus metal detector is guaranteed for 24 months from date of purchase against all manufacturing defects.
Control Box is sealed and contains no user serviceable parts, opening the Control Box will invalidate the Guarantee
This Guarantee does not cover: Damage from dropping, impact or accident, damage due to improper use or care of the detector,
damage resulting from leakage of batteries, damage to the coil or coil cable.
In the event of a problem, please contact us. Any metal detector returned under Guarantee must be properly packed and sent by insured carrier.
The sender is responsible for loss or damage in transit.
A full repair and replacement parts service is available.
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