The Nexus Standard SE is an Analogue Induction Balance (IB) metal detector that operates in the very low frequency (VLF) range and it is designed for use on
in land sites and salt water beaches.
It may be used in either of the following basic modes of operation; for In Land mode - All-Metal, Discriminate, Voltage Controlled Oscillator or combination
between them; for salt water Beach Mode - 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 both small and large targets at extreme depths. However if
used with any of the accessory search coils available from the SE range the Nexus Standard SE will be one of the most versatile metal detectors available on
the market.
The standard coil supplied is the dual 9” SE Standard and this is ideal for most searching operations. The mentioned above SE range of accessory search
coils is available for optimum performance when searching for the tiniest targets in difficult conditions or performing a general field survey. All of the coils are
capable of finding the largest and smallest of targets.
To obtain the best results with the Nexus Standard SE, as with all metal detectors, it is essential to understand the settings and operation of the detector. Some
experience in metal detecting will be beneficial. Users may need to practice and experiment in order to obtain the best possible 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 if used 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.
ASSEMBLY AND PREPARATION
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
and by using the locking pin underneath fix the two poles in working position. The locking pin is indicated underneath the stem with two small labels, one on
the top pole and the other on the lower part. While pulling out the lower part of the stem look for the second label to show. The locking pin will come out in the
designated hole when the two labels are in line.
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. It is recommended that a small amount of lubricant (WD40) is applied to the inner
sides of the coil attachments for easier assembly. 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 designed to work with 8 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 cup at the top of the detector stem). Lift off the cover. Insert the batteries, in their correct alignments, into the plastic holder and
make sure that all of 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.
CONTROLS
The Nexus Standard SE has seven primary control knobs and three toggle switch controls. Six of the rotary controls are located on the front of the control box
and the seventh is located on the back of the Meter box. One of the toggle switch controls is located underneath the Meter box, the second toggle switch is
located on the front of the Control box and the third is located on the back of the Control box next to the search coil socket.
Power switch The Power switch is located on the front of the control box and it is combined with the Volume control knob. It turns the detectors on or off.
Meter Sensitivity 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.
Discrimination This 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 desired targets.
Ground Balance
This knob is used to set the balance of the Nexus Standard SE to suit the soil conditions on any given site.
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 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 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.
Beach mode Mode Toggle Switches
One is located on the front of the Control box between the Discrimination and the Ground Balance controls. The second beach mode toggle switch is located
on the back of the Control box next to the search coil socket. These switches set the detector in either In land Mode or in Beach Mode. IMPORTANT; Both of the
Beach Mode toggle switches has to be turned always in the same direction - to the left for Beach Mode or to the right for In Land Mode.
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 Standard SE must be properly tuned to the 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 that will indicate Low Battery Condition.
Holding the Nexus 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 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 about 2” above and parallel to the ground surface. Raise the coil gently to about 10” above the 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, 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.
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 between 2” and 10” above the ground surface, as for ground balancing. 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, 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 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 will result in desired targets being missed. To obtain best
Discrimination setting please follow this procedure;
Firstly, for this 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).
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 non ferrous target. While moving the nail side to side begin turning the Discrimination knob slowly anti clock wise until the tone in the headphones
change from clear to clicking. The position of the Discrimination knob in which the signal from the nail begins clicking is the best Discrimination level for all
Nexus metal detectors. Having the scale around the Discrimination know 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 now ready for 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 ‘scrub’ the coil on the surface of the ground. 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
Make sure that 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
ONLY 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 is not necessary to use the meter as the audio discrimination provides sufficient Target Analysis. In All-Metal Mode, both ferrous and
non-ferrous targets will give the same audio response by a sudden increase in the intensity of the threshold tone. A strong response indicates a large or
relatively shallow target and a weak response indicates 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 targets 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 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.
TIPS
The Nexus Standard SE may seem very different in operation to some detectors presently available. Some practice and experimentation with the settings are
necessary to get the best results on different sites.
Users should persist and regular use over a period of few weeks is likely to be needed to become proficient, especially in detecting the very deepest and
smallest of targets.
Work slowly when detecting. Sweeping the coil too fast over the ground will result in signals being missed. It must always be remembered that no detector can
find what is not there – nor can any detector give a signal unless the coil is passed directly over that target. Using the Nexus Standard SE will guarantee good
finds if the proper adjustments are mastered and the searched site contain desired targets.
All detectors and sites are different and a particular combination of frequency and filtering might be best on a specific site.
Site conditions will significantly affect depths and performance. Heavily furrowed or broken ground or thick stubble is especially difficult. Sites where the ground
conditions vary to a considerable degree may require the Ground Balance to be adjusted for best results.
BEACH MODE
In Beach Mode setting the Nexus Standard SE is equally powerful, accurate and sensitive as it is in land.
The general setting for Beach Mode work in the following order;
Turn on the detector from the Power Switch.
Turn the Beach Mode toggle switches both to the left. In this position the switch on the front of the Control box will point to the Discrimination knob and the
switch on the back of the Control box will point to the search coil socket.
Set the Sensitivity control on minimum.
Turn the Discrimination Mode switch in medium position, All Metal Mode.
Lift the search coil of the detector high above the salt water and tune the Threshold at minimum tone level. Only very small audio signal is to be left.
Set the Discrimination knob at 12 a clock.
Set the Ground Balance knob at 4 a clock.
Start swinging the search coil close above the very wet sand or salt water and try to find a place free from metal targets.
When you are satisfied that there are no metal targets in the area, begin vertical movements above the very wet sand up and down from the level of the sand to
around 10" above the sand. During this procedure use the Ground Balance knob to cancel out the signals from the salt water in the same way as in a standard
In land ground balancing procedure. In this case the procedure will be called SALT WATER BALANCE. REMEMBER! The Salt Water Balance is done only in All
Metal Mode.
If the Salt Water Balance has been done accurately while moving the search coil up and down only very small or no signals from the salt water should be
possible to hear in both ways of the movement, if the detector is set on minimum Sensitivity. Also with correct Salt Water Balance the Meter needle should
remain stable like in the In Land Mode.
HIGH SENSITIVITY setting is not recommended when working on the beach unless the search is been conducted a few meters from the wave line where the
moisture content in the sand is lower. That is to minimize some false signals, which could occur in high Sensitivity setting around the salt water.
If the Salt Water Balance procedure is done properly the Nexus Standard SE will be capable to achieve the same deep search results under salt water wet
sand as in normal ground search. We can guarantee that the Nexus Standard SE will be capable to find a large coin (30mm in diameter) at depth at least 14"
(36cm) under compact very wet sand in most beaches around the world. For smaller targets the depth capabilities will depend on the local contamination,
mineral content and above all the size of the search coil. Search coils with smaller size and relatively high frequency settings would be always more
compatible for hunting small targets - tiny ear rings, small coins etc.
DISCRIMINATION ADJUSTMENT ON THE BEACH.
In Beach Mode the Discrimination of Nexus Standard SE works in reversed order, which means that the direction of the Iron Rejection is changed in opposite
way compared with the standard In Land Mode. The Accept side of the discrimination scale is now Reject and the Reject side acts as Accept. If the
Discrimination knob is turned to the Accept side the detector will reject targets and if it is turned to the Reject side will accept targets.Also it is important to
understand that in Beach Mode the detector will Discriminate first all large objects and then the smaller objects. In Beach Mode the Nexus Standard SE can
effectively reject all large and medium size objects such as; All iron, Coca Cola cans, large non ferrous objects, large and medium size coins, any target of high
conductivity without loosing the white and yellow gold jewels or natural gold nuggets. By using the Discrimination knob the Nexus Standard SE can easily reject
beer bottle caps and not loose even as small as one gram of natural gold nugget.
The purpose of this Discrimination set up is that most metal detector users would search for smaller objects on the beach rather than larger, providing that the
contamination on most beaches around the world is severe.
The Discrimination adjustment in Beach Mode has to be made in the following order;
After the Salt Water Balance procedure is complete turn the Discrimination Mode toggle switch in Iron Rejection mode (push forward).
Get a beer bottle cap in good shape (best if new) and place it on the flat wet sand in horizontal position.
Start swinging at immediate distance (1" or no more than 30mm) above the bottle cap.
While swinging start turning the Discrimination knob from 12 a clock to the Accept (clockwise) position very slowly and gently. Continue turning the
Discrimination knob until the signals from the bottle cap start to brake up, not disappear completely, but only to brake up so they can be recognized as
undesired targets.
The same procedure can be used to discriminate many other targets, but keep in mind that not all of the undesired targets can be rejected successfully. Most of
the pull tabs can not be rejected without significant loss of good targets.
Leave the Discrimination knob at this position and begin your search. In this Discrimination setting the Nexus Standard SE should retain full sensitivity to coins,
white gold jewellery and tiny gold and silver ear rings. In this Discrimination setting the sensitivity to natural gold nuggets will not be affected.
CARE
All metal detectors are precision instruments and require careful handling to ensure they remain in good working order.
Avoid dropping, impacts or violent shaking of the detector and protect it while transporting.
The Nexus Standard SE metal detector should not be used in extremely wet weather conditions, such as heavy rain, without protecting the control box, battery
box and meter housing. The coil assembly is fully waterproof.
If water penetrates any of the boxes, switch off the detector and remove the batteries. It is suggested that the detector be placed in a warm place to dry out
slowly.
Mud and soil should be carefully removed, using a damp cloth or water only. Do not use detergents or abrasives and avoid getting water in the control boxes.
When storing the detector for long periods or when shipping, the batteries should be removed.
Avoid storing the detector in areas where it will be exposed to extreme temperatures, dust, moisture or contaminants.
Do not attempt to modify or repair the detector or allow any unauthorised repair centre to do so.
GUARANTEE
The Nexus Standard SE metal detector is guaranteed for a period of 24 months from date of purchase against all manufacturing defects or loss of performance.
The Control Box is sealed and contains no user-serviceable parts Opening the Control Box will invalidate the Guarantee.
This Guarantee does not cover:
Damage due to 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 any problem, pleases contact. Any detector returned under Guarantee must be properly packed and be sent by insured carrier. The sender is
responsible for any loss or damage in transit.
A full repair and replacement parts service is available.
TECHNICAL SPECIFICATIONS
Operating Frequency Range: 4.2 - 18 kHz (subject to search coil in use)
Coil Design: Twin Concentric Overlapping
Coil Weights:
9” :700g
6” :460g
4” :400g
Weight (with dual 9" coil): 1.9 kg (with 8AA batteries and coil cover included)
Coil Case Construction: ABS Glass Fibre resin potted
Audio Frequency: Custom tuned
Audio Output: 6mm stereo headphone jack
Power Supply: 12v (8 AA alkaline batteries)
Battery Life: up to 45 hours intermittent
Operating Modes: All-Metal and Discriminate
Optimum Temperature Range: -15° to +60° C
Optimum Humidity Range: 0 to 85% RH
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Standard SE user manual
