Mikron NRG 150 User Manual

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NRG 150

User’s operating manual

Made in Bulgaria

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In order to use the device for a maximum long time and without problems, as well as to
be able to use all of its options, please read carefully the whole instruction manual and
observe the directions in it.

Your NRG 150 is shipped with these parts:

- Upper Pole Assembly – fully assembled, including upper pole stem with
handle grip

- Middle pole assembl y with pole lock

- lower pole - made of plastic in order to not disturb the work of the coil.

- 27 cm DD search coil

- electrical set box – made of extremely strong plastic, including 8 AA alkaline
batteries or 10 rechargeable accumulators NiMH 1,2V/2800mAh.

- 220V automatic charger

- Operation user’s manual

Warranty card

If any of these items are missing, immediately inform us or our authorized
dealer where you purchased your detector.

Assembling the NRG150 is simpl e and you don’t need any special tool s .

Just mount the search coil on the lower pole assembly, connect the pole
assemblies together, adjust the pole length, wrap the excess cable around the
pole and plug the cable into the control unit. Finally adjust search coil angle to
your preference and you are ready.

NOTE: Do not allow the cable to flop loosely over the search coil. Since the

detector is sensitive enough to „see“ the tiny wires in the cable, a floppy cable

can cause false signals as the search coil senses the moving wires.

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CONTROLS:

NRG 150

control panel:

- “ GROUND BALANCE” – eliminates the signals of the ground mineralization.

- “ DISC” – regulates degree of elimination of iron and unwanted objects.

- “ THRESHOLD” – used for adjusting sound level and regulates depth of.

- “ ON / VOLUME” – switches on the detector and adjust sound level

- “ SAT SPEED” - (Self Adjustment Threshold) SAT Speed – adjustable rate
beep on detection of metal objects.

- Button “ Auto GEB” – turns on and off automatic ground balance.

- Button “ LIGHT” – switch on and switch off LCD backlit.

- J ack “Phones” – used for head phones (one 3,5mm on the front panel, and one
6,3mm. on the bottom side of the box)

1. Assembling of the device:

The bearing rod is assembled by inserting of the lower part into the upper
one. Choose the desired length of the whole construction and the fixing clamp
is tightened between both parts of the bearing rod. The lower part of the
bearing rod is put with the opening between the ears of the coil an d the plastic
bolt is tightened by choosing the position of the coil to be parallel to the
ground surface. The coil cable must be wind up tightly around the bearing rod
and is switched to the socket of the box with electronic. Upon switching of the

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cable of the coil to the socket on the box, tighten the well the metal nut of the
coupling to the terminal of the box. Upon switching off, unscrew the nut
completely and pull out the coupling without pulling or twisting the cable of
the coil. This way, you will prevent the cable and the conductors in it from
breakdown or short circuit.
The searching coil is approached to the surface of earth by paying attention to
avoid presence of metals within its range.
NOTE: Detector may not work as expected indoors due to the high degree of
metals used in modern construction. It is best to tune and practice outdoors to
ensure stable, predictable results.

2. Switch on and work with NRG 150.

1. Tur n the “ON / VOLUME” knob to “ ON” an d adju s t pref e ren c e volume of
sound. The display will momentarily show an opening screen which lists the
software version.

2. Setting t he “THRESHOLD” - While holding the detector a few feet above
ground and away from any metal object, slowly turn the “THRESHOLD” knob
until you hear a very slight audio tone through the speaker or headphones. This
is the optimum set-point for the “THRESHOLD” . If the search coil is not in
motion and not close to metal, the detector should be silent. A light “ buzz ”
adjustment is recommended to insure optimum depth and maximum
performance.
As “ THRESHOLD” i s in l ow p o si t ion, a s l o w is sens i t ivit y. Too low of a
threshold setting ma y cause ver y weak signals to not be heard. Too high of a
threshold setting may cause operating instabilit y.

3. You can work in manual or in automatic “GROUND BALANCE” modes:

- In manual ground balance mode:
Search for and select a clear piece of ground or sand that does not contain any
metallic targets. With the coil elevated at least waist high and away from any
metallic target, slowly adjust the THRESHOLD control until a very faint audio
threshold signal is heard.

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2 - 20cm.

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Lower the search coil to within one-inch of the ground surface while listening
to the threshold audio signal. If the threshold signal is high tone, the
“GROUND BALANCE” control needs to be decreased (rotate counter
clockwise). If the threshold signal is low tone, the “ GROUND BALANCE”
control needs to be increased (rotate clockwise). Keep repeating this step until
threshold si gnal is the same within one -inch of the ground as it is in the air.
Once this is accomplished, the detector is properly ground balanced .
When the ground mineralization is rejected, the detector can see deeper targets,
and is less susceptible to ground interference.
While balancing the detector, you have to be sure there are no metal objects
around the search coil. If it seems difficult or impossible to get little change in
the steady threshold as the coil is lowered, you may be attempting to tone on
top of a peace of metal. Move to a different spot on the ground and repeat
balancing. Once the initial ground balance is completed, the detector is ready to
be used.

Fig. 1

A prope r a d j ust m e nt of th e man u al gro u n d balan c e will en a b le a l ittl e m o re

dep t h over automatic ground balance. Howe v e r, an i mp r o per adjus t ment of the

manu a l g r o un d ba l a nce cou l d an d in all p rob a b ili t y de c rea s e th e d e p th

per f orman ce o f t h e me t a l d e t ect o r gr e atl y .

- In automatic ground balance mode: push the button “Auto GEB” and

you will hear a beep.
The ,,GROUND BALANCE” kn o b d o n o t have t o b e t u rne d o n a t t hat ti m e!! If
you sweep the search coil over non-ferrous metals (gold, silver, copper, bronze)
a high-toned sound can be heard; and if you sweep over ferrous metals a low
sound is heard. Without the ability to cancel ground mineralization, a metal
detector could respond to mineralization as if it where a good target.

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Always try to manual balance to the ground surface, and if it seem difficult or
impossible to get little change in a steady thr eshold as coil is lowered, we
rec o mmend use “ Auto GEB” r e gi m e . Use “Auto GEB” when you find yourself
in a situation that does not allow manual ,,GROUND BALANCE” to be
adjusted correctly.
The ground conditions are really bad with mineralized ground, hot rocks and
iron trash, so your sweep speed must be reduced for best results.
“Auto GEB” is recommended when searching in wet salt sand too.

NOTE: Under some severe mineral conditions ground balancing may not be
possible. The best result you will get if searching when the soil is dry.

Fig.2

NRG 150 working in dynamic regime - searching metal objects is made by
moving search coil toward ground surface – fig.2 , fig.3

Wrong Correct

Fig.3
Start swinging the search coil in wide sweeps that overlap each other, as near to
the ground surface as possible-Fig.2 The search coil should not touch the
ground during your sweep. The pole length should be adjusted to allow this
without having to lift the detector wit h your elbow or shoulder. The search coil
should rest about one inch above the ground while you are standing erect. The
angle of the search coil should allow the bottom to be parallel to the ground.