Nexus Standard MP Manuale utente

Nexus Standard MP

Metal Detector

User Manual

Table of contents.

1. General description – page 3, 4

2. Assembly & Preparation – page 4, 5

3. Controls – page 5, 6, 7, 8

-DDM – Definite Discrimination LED Meter – page 6

-Discrimination Control – page 6

-Ground Balance Control – page 6

-Threshold Control – page 7

-Sensitivity Control – page 7

-Volume Control and Power On/Off switch. – page 7

-Dual Tone Control – page 7

-Mode (Iron Rejection) toggle switch – page 7

-Battery Test toggle switch – page 7

-Mineral Controls – page 8

4. Operation – page 8, 9, 10, 11, 12

-Full Manual Set Up – page 8, 9, 10

-Search method – page 10, 11

-All Metal Mode – page 10

-Discrimination Mode – page 11

-Pinpointing – page 11

5. Special Modes of operation – page 10, 11, 12

-Discriminating salt water on tidal beaches and salt water lakes –

page 10

-Discriminating all large metal objects leaving only the

Smaller ones -- page 11

-Discriminating all small targets and leaving only larger

Metal objects – page 11, 12

6. Tips – page 12

7. Care of Nexus Standard MP – page 12, 13

8. Guarantee – page 13

9. Technical specifications –page 13, 14

10. Troubleshooting –page 14

General Description

The Nexus Standard MP is an Analogue Induction Balance (IB) metal

detector that operates in the very low frequency (VLF) range and it is

designed for use on all Inland Sites, Tidal Salt Water Beaches.

The Nexus Standard MP is benefiting from our new Super Dumping

Technology that gives it the ability to effectively suppress by means of

proper balance any kind of mineral material that exist on the ground

surface.

MP stands for Mineral Power.

The Nexus Standard MP currently may be the most efficient IB metal

detector for use in heavy mineral ground conditions and strong magnetite.

It may be used in any of the three basic modes of operation - All-Metal,

Discriminate or Turbo Audio Mode.

The Nexus Standard MP is designed to be an All-purpose metal detector,

capable of finding both small and large targets at extreme depths in normal

soil conditions. It is also designed to work with very high efficiency in all

existing types of mineral soils and magnetite (black sand).

The standard coil supplied is the 10”DD and this is ideal for almost all

searching operations.

There are 3 different search coils currently available for the MP that can be

used as accessory with the Nexus Standard MP.

DD shape search coil range.

- 13"DD at 6 kHz

General search coil designed for higher detection ratio of small, medium

and large targets in all search conditions. It exhibits greater depth than any

other DD search coil in the MP range.

Due to large search area it will find more targets for shorter period of time

compared to smaller search coils.

This search coils is best of all suitable for mineral conditions as its greater

size will result in lower mineral interference and greater depth compared to

the smaller coils in the range.

- 10"DD at 7 kHz

It could be the best general search coil that you’ll ever need. It exhibits

excellent dept and discrimination in all conditions. Very efficient in detecting

small targets at great depth. Very fast in isolating individual targets.

- 7"DD at 8 kHz,

General search coil designed for quick scan of new detecting fields and

areas. Very good for searching narrow spaces, holes and ditches. Best

suited for small and medium targets in contaminated areas.

Each coil is tuned to a slightly different frequency within the design range,

to minimise interference from other Nexus detectors. Performance values

for all Nexus detectors will be identical.

To obtain the best results with the Nexus Standard MP, as with all metal

detectors, it is essential to understand the settings and operation of the

detector.

With the Nexus Standard MP professional users can enjoy the benefits of

the deep seeking Nexus technology, .

As a general rule the best results will always be obtained when the Nexus

Standard MP is properly set in manual mode. Therefore users will 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 MP is designed to detect the very deepest of targets and

operates near to the limits of what is achievable with induction balance.

Assembly & Preparation

The Nexus Standard MP is supplied boxed and ready for quick assembly

by simply attaching the two lower stem poles to the top one, tightening the

collars and attaching the coil to the lower stem section, using the plastic

bolt and friction washers supplied and tightened by hand so that coil is held

at the correct angle to the stem; the coil cable plug is inserted to the socket

in the control box and then tighten the knurled ring, taking care when

winding the cable around the stem that the cable is not strained.

The centre stem pole is of the same tube diameter as the top one and can

be left off in circumstances where a short stem is needed; it is meant for

use on steep sites, river banks, caves, ditches and similar conditions.

The Nexus Standard MP is supplied with a drop in battery holder that can

be used for all types of AA size batteries, (alkaline or rechargeable); a

charging socket is provided to the battery box for connecting a charger unit.

To insert or change batteries remove any three of the thumb plastic screws

from the base lid of the battery box (the battery box is below the arm cup at

the top of the detector stem) and loosen the fourth screw. Turn the cover to

the side. Insert the 10 batteries, in their correct alignments, into the plastic

holder and make sure that all the terminals have a good electrical contact.

Locate the battery holder into the compartment, ensuring the connecting

terminals of the battery holder are in good contact with the two electric

spring loaded terminals behind the recharge socket. Do not over-tighten the

plastic thumb screws when refitting.

If you wish to use headphones (highly recommended) connect your

available set to the 6 mm jack socket on the battery box. The Nexus

Standard MP has an internal loudspeaker so headphones are not

absolutely essential. For any headphones that have a volume control,

ensure that this is set to MAXIMUM and use the Nexus Standard MP

Volume knob on the control box to set the volume level.

Controls

The Nexus Standard MP has eight rotary control knobs and three toggle

switches (two located on the front panel of the control box and one

underneath the control box)

DDM – Definite Discrimination Meter

The DDM meter is based on LED technology and provides a reliable visual

discrimination analysis in All-Metal Mode and Iron Rejection Mode. The bar

will light RED for non ferrous and BLUE for ferrous (iron) targets.

Discrimination

This knob sets the level of the discrimination. Rotating the Discrimination

knob clockwise (from 0 to 10) will INCREASE the level so that Iron is

increasingly not detected (but high settings will result in the loss of

potentially good targets). 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 MP to suit the

soil conditions on any given site.

The GB control on the MP is made with a 10 turn precision potentiometer

fitted with a precision multi turn dial mechanism with locking function.

Threshold

This knob sets the level of the threshold tone. The Nexus Standard MP

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 chosen will depend on the soil conditions but, in general, the

highest possible setting should be used. On contaminated or mineralised

sites, it may be necessary to reduce the sensitivity to achieve more stable

operation of the detector.

Volume and Power On/Off switch.

This knob sets the volume of the tone and responses and it is used also to

turn on/off the Nexus Standard MP. This knob should always be used for

setting the volume. Any volume control on the headphones should be set

to MAXIMUM.

When the Power is turned on an LED light above the Volume control knob

will indicate that detector is turned on.

Dual Tone.

This knob activates and adjusts the audio discrimination option and gives a

high-pitched tone response for non ferrous and low-pitched tone for ferrous

(iron) responses.

Mode Toggle Switch

Located under the control box and accessible from the hand-grip, this

toggle switch is used to change operating modes. When pushed to the left,

the Nexus Standard MP operates in Discrimination Mode. In the centre

position, the Nexus Standard MP operates in All-Metal Mode.

Pushed to the right position the Mode toggle switch will activate the Turbo

Audio Mode.

The Turbo Audio Mode works in relation to the Threshold level, so each

time the Turbo Audio is enabled the Threshold level have to be raised

(adjusted) up to allow the best possible detection range without false

signals.

Battery Test Toggle Switch.

This is located on the front panel of the control box. It is used to check the

condition of the batteries by using the DDM; if the meter bar lights one third

or less of its length, changing or recharging the batteries is recommended.

Mineral Control section.

It consist of two rotary control knobs and one toggle switch all located on

the left side of the front panel.

The Coarse control adjusts the coarse level of sensitivity to minerals.

The Fine control is a 10 turn precision potentiometer supplied with a

precision multi turn dial mechanism with a locking function.

The Fine control is meant for precise tune of the sensitivity to minerals so

maximum detection can be achieved across the most difficult to penetrate

mineral rocks and soils.

The toggle switch in the Mineral Control section has two positions.

Standard for most types of normal and mineral soils and Heavy for

magnetite, Iron or other types of ore.

When the Nexus Standard MP is used on normal soil the Mineral Controls

should be set at 0 (minimum) and the toggle switch at standard position.

General Operation and Setting Up

Having assembled the Nexus, inserted batteries and connected the

headphones, The Nexus is ready for use.

The Nexus Standard MP is designed exclusively for use by

professionals.

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 and maximum depth and sensitivity to desired targets, the Nexus

Standard MP must be properly tuned to the site and the settings to achieve

this are set out below.

Full Manual Set-Up

Firstly, 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 Standard MP

away from other metal detectors or potential sources of electronic

interference.

Turn the Nexus Standard MP on. A tone will be heard and the DDM meter

will flash. The tone will fade and the meter bar will settle after a couple of

seconds.

To check the condition of the batteries, turn up the Battery Check toggle

switch. After the battery check is been done turn the toggle switch back

down to allow the DDM to indicate metal targets. Keeping the DDM in

battery check mode for a long time will drain the batteries.

Holding the Nexus Standard MP with the coil well above ground level,

adjust the Sensitivity control knob to minimum. Adjust the Threshold knob

to obtain a minimal (faint) tone setting. Adjust the Volume knob to set a

comfortable level (remembering to set any adjustable headphone volume

control to MAXIMUM). Lower the coil to the ground and sweep side to side

slowly to ensure that there are no metal targets in the place you are tuning

the detector When you are satisfied proceed as follows.

Position the coil about 3” above and parallel to the ground surface. Raise

the coil gently 10” above the ground and lower back to 3” (75 mm) above

ground several times. Note whether the threshold tone remains the same

or if it increases or decreases in intensity while raising and lowering the

coil. There should no residual tone change left after the GB is done.

IF THE GROUND BALANCE IS INCORRECTLY SET THE DDM METER

WILL INDICATE STRONG FALSE SIGNALS FROM THE GROUND

MINERALS.

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.

The next setting is to adjust the Sensitivity to suit the site conditions. From

the minimum setting of the Sensitivity knob (set at minimum in the initial

ground balancing procedure), adjust the control clockwise to increase the

sensitivity. Repeat the procedure of raising and lowering the coil between

3” (75 mm) and 10” (250 mm) 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 depth, the setting should be at the

maximum possible while maintaining a stable threshold tone.

In highly mineralised soil conditions the Mineral Control may be adjusted to

tune the detector to a stable operating condition.

Setting the desired Discrimination level is done by rotating the

Discrimination knob clockwise to INCREASE the discrimination level and

REDUCE the sensitivity to ferrous (iron); higher than necessary settings will

result in desired targets being missed. Rotating the Discrimination knob

anticlockwise will DECREASE the discrimination level and INCREASE the

sensitivity to ferrous (iron) targets.

In general, an effective method of setting the Discrimination level, suitable

for most search conditions, is by passing a rusty iron nail (about 50mm

long) close to the search coil. Rotate the Discrimination knob clockwise

until the iron nail is rejected in every possible position against the coil. After

this procedure check if small non-ferrous targets are detectable without

loss of depth.

Setting the Discrimination knob at middle position will give proper

discrimination of the detector in most cases.

Finally, check again the threshold and volume settings for comfortable

levels.

The Nexus Standard MP is now set up for the particular site conditions and

is ready for use.

Search Method

With the Nexus Standard MP set up and ready, the coil should be swung

smoothly from side to side, a little above the ground surface. The sweep

speed should be moderate and never too fast.It is not effective to ‘scrub’

the coil on the surface of the ground (this can also damage the coil and

places strain on the stem assembly).

Suggested operating heights for the standard coils are:

13” DD coil: 2” (50 mm) minimum above ground surface

10” DD coil: 1½” (40 mm) minimum above ground surface

7”DD coil; any distance.

However, by applying a Mineral Control up to a certain level the MP

detector can effectively remove all residual ground noise and then the

search coils can be carried at any distance above ground. In this case

however there will be some loss of depth.

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 detection coverage.

In All-Metal Mode, both ferrous and non-ferrous targets will give the same

audio response (unless the Dual Tone function is turned on) 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 DDM meter. To analyse a signal with the Meter observe its

colour response.

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 an indistinct and erratic response.

Pinpointing is by simply X-ing the coil across the signal. The position

where the signals are strongest below the coil centre indicates the target

position. 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 so

it is suggested that, when digging, the user allow space to avoid possible

damage to finds.

Special Modes of operation.

Discriminating against Salt Water on wet sand or tidal beaches.

After initial set-up turn on the Iron Rejection and set the GB to 0. While

raising and lowering the coil above the salt water or the wet sand begin

turning the Discrimination knob from position 0 to clockwise direction, very

slowly until the salt water signals turn into small clicks.

This setting will give you the best possible depth results on the wet sand.

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