AKA SOREX PRO User manual

AKA LLC ООО. Moscow.
Selective Metal
Detector
SOREX PRO
- light
-portable
-multi-frequency
-supersensitive
-fast
-multipurpose
Operating manual
For Sorex Pro product support and discussions visit http://www.reviewdetector.ru
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Selective Metal Detector SOREX PRO. Operating manual.
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Content
CONTENT................................................................................................................... 2
GENERAL GUIDELINES....................................................................................... 3
PRODUCT FEATURES ........................................................................................... 3
DELIVERY SET ........................................................................................................ 5
SPECIFICATIONS .................................................................................................. 5
GETTING STARTED............................................................................................... 5
POWER SUPPLY ..................................................................................................... 6
CONTROLS AND CONNECTIONS .................................................................... 6
CONTROL BUTTONS............................................................................................. 6
DEVICE DISPLAY................................................................................................... 7
DEVICE SETTINGS ................................................................................................ 7
«М» (MAIN) MENU.............................................................................................. 8
«М1» (MAIN ADDITIONAL)............................................................................ 9
«A» AUDIO MENU .............................................................................................. 11
«A1» ADDITIONAL AUDIO MENU .............................................................. 12
«V» VIDEO MENU............................................................................................... 14
«S» MENU .............................................................................................................. 15
GROUND BALANCING ....................................................................................... 16
DISCRIMINATION SEARCH MODE SETUP ............................................... 20
DISCRIMINATION SECTOR SETUP ............................................................. 22
ALL METALS SEARCH MODE........................................................................... 22
"STATIC" MODE (PIN-POINT)...................................................................... 22
SEARCHCOIL REPLACEMENT......................................................................... 23
VISUAL IDENTIFICATION TOOL - HODOGRAPH.................................. 25
THE ADVANTAGE OF HODOGRAPHIC INDICATION OVER VDI ..... 25
MULTI-FREQUENCY............................................................................................ 26
SEARCH AND IDENTIFICATION METHODS............................................. 26
ADDITIONAL MENU ........................................................................................... 29
QUICK REVIEW OF SETTINGS STATUS. ................................................... 29
TROUBLESHOOTING.......................................................................................... 30
WARRANTY ............................................................................................................ 31
QA/QC CERTIFICATE ........................................................................................ 31

Selective Metal Detector SOREX PRO. Operating manual.
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General Guidelines
Metal detector Sorex PRO is designed to search for and identify metal objects in
dielectric (dry sand, wood etc) and low-conductivity environment (soil, brick walls etc).
The device can be used in the following areas:
- criminalistics;
- engineering corps;
- housing and utilities infrastructure, civil construction and firefighting, detection of
buried utilities, pipelines, cables, manhole hatches, water posts, valve caps etc;
- archeology and search for buried treasure
The device is designed to work in the following conditions: ambient temperature
from -5 to +50°С; relative humidity up to 98% at a temperature of 25°С; atmospheric
pressure from 630 to 800 mm Hg
Product features
Sorex PRO is a selective eddy current metal detector with equalized induction
transducer (searchcoil). This is the top-of-the-line professional model from the best-
selling Sorex family.
This unit has incorporated best time-tried hardware and software solutions from
previous models. It was updated with a variety of new original features which increased
search efficiency and make this device one of the most versatile detectors in the world.
Sorex PRO is a multi-frequency device. Its configurations similar to the popular Sorex
7281 with 4 AA batteries power supply.
The configuration of this metal detector allows using any searchcoil manufactured by the
AKA Company regardless of their size or operating frequency.
Like always, the device is based on our original two-channel pattern including
independent and operating in parallel:
- detection channel –the channel which transmits single-tone signal for the
sound indication (SI) in the real-time mode (RT channel);
-identification channel –the channel which transmits short tones with different
frequencies to the SI after the searchcoil is moved above the target (ST channel)
Just like other models, Sorex PRO may search in the dynamic mode, i.e. the
target may be detected only when the searchcoil is moved.
The static search mode is also available. It is intended for the exact detection of the
target position.
Sorex PRO has a comprehensive sound and visual identification system. First of
all, this system includes our signature indirect hodographic visual identification of search
objects, which is highly appreciated and considered to be the most informative method
of object value or valuelessness detection.
Sorex PRO provides the user with the widest range of SI in compliance with his
personal choices and types of current tasks. But the main difference between this model
and other detectors is its switch option for the so-called searchcoil signal main algorithm
(MA) processing. This option provides better customization to search conditions and
increases target identification reliability.
This solution is applied for the first time.

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Sorex PRO is able to process signals with three independent algorithms.
The first one is –MSF. This is a traditional and widely used in previous models
medium speed algorithm for general use. It is intended for slightly trashy areas.
The second one is –SSF.The main feature of this algorithm is better detection of
magnetic properties of metal objects, especially flat ones (iron plugs, tin pieces etc),
which are often mistaken for nonferrous objects. The algorithm has significantly longer
sound response delay. It is intended for the search in non-trashy areas.
The third switchable algorithm is M/T (metal trash or fast dimensional harmonic
search filtering FSF). Its main feature is fast signal processing. It is intended for trashy
areas. This algorithm incorporates new concept with fastest processing of searchcoil
signals from close targets. Its noteworthy feature is absence of sound response delay,
which exists in SSF and MSF algorithms.
So, Sorex PRO is a multi-frequency detector. It has a wide range of coils of
different sizes and frequencies. It has several switchable main algorithms of signal
processing which allows device adjustment for various search conditions: from trashy
areas to deep search of single targets. The device equipped with 15DD-3kHz searchcoil
may detect soldier’s helmet down to 1.4 m). The device is light (about 0.7 kg without
the searchcoil) and it can be equipped with various types of shaft, including extendable
arms providing "no-disassemble portability" option. With all these features Sorex PRO
becomes one of the most versatile detectors with record-breaking detection depth and
unique identification capabilities.
Moreover, we are pleased to inform you that this model was updated to simplify
its usage and increase the comfort of search.
1. We have updated ground balancing system. From now on the GB phase executed
right after the searchcoil adaptation shall be taken as 0 by default. All current
balance corrections performed during the search shall be calculated from this
predefined phase zero-level. You have to admit that all phase “deviations” of the GB
are better traced by the 0, it would facilitate the control over the quality of the
balance. In other words, we have resolved the similarity issue. The GB phase level
was standardized for all devices..
2. Sorex PRO has a fully automatic searchcoil adaptation system. It means that the
device automatically recognizes a new searchcoil installed instead of the old one
operating with different frequency. The device detects such searchcoil and initiates
adaptation program.
3. Sorex PRO is first device in the product line with search programs switchable on the
fly and independent settings. There is no need to reset the device when search
conditions change.
4. Moreover, the additional programmable multi-functional F button was added to
facilitate operation. You can assign an operation for this button. F can be assigned
for quick MA switch, change of sound indication type, change of short tone types and
quick “Economy” mode start.
5. The layout of the device menu is worth describing. Unlike previous models of the
product line this device has six page menu with immediate access to each page. All
pages are theme-based: main menu, special (S) menu, audio (A) menu, video (V)
menu. It increased intuitive perception of the menu, decreased setting search time
and accelerated adjusting speed.

Selective Metal Detector SOREX PRO. Operating manual.
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6. If you do not use your device for a long time and forget the status of its settings,
we have "quick settings review" option for you. When you press and hold
appropriate button the selected mode and settings will be displayed.
Engineers of the AKA Company are sure that you will be
happy with the catch you get with Sorex PRO. The introduction
to the variety of original technologies used in this device will
make your hobby more educative, interesting and exciting :).
Delivery set
• Electronic module 1 item.
• Searchcoil DD 10” - 7kHz with rod 1 item.
• Shaft* 1 item.
• Arm rest 1 item.
• Bracket ** 1 item.
• Headphone *** 1 item.
• Carrying bag *** 1 item.
• Searchcoil protector*** 1 item.
_________________________
*) the device may be equipped with extendable arm providing "no-disassemble portability" option
**) electronic module bracket hanger in the arm rest zone for better mechanic balancing of the device (sold by
supplementary order)
***) sold separately or in supplementary order
WARNING! For additional accessories and types of searchcoils go to:
aka.2000.ru
Specifications
Maximum detection range of metal objects
(in the air, searchcoil 10"DD - 7 kHz) ST channel:
- coin Ø25 mm (brass), without electromagnetic interference - 47 cm;
Operating frequency range, kHz - 1...22;
Power supply (number of batteries, type, voltage):
Number of batteries, type, voltage - 4, type АА, 4.8-6V
Runtime:
- 4 batteries 2800 mAh type АА (1.2V) - 20-40 hours;
- 4 batteries type АА (1.5 V) - 10-20 hours.
Dimensions, (package) mm: - 520х170х85;
Weight (without batteries): - 950 ±5% g.
Getting started
Assemble metal detector. To assemble:
- attach arm rest to metal shaft with two screws.
- attach searchcoil to the internal (plastic) rod;
- insert rod with the attached searchcoil into the metal shaft for the required length using

Selective Metal Detector SOREX PRO. Operating manual.
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latches and holes in the shaft;
- tighten collect clamp;
- wrap the searchcoil cable around the shaft evenly and tightly (loose cable may cause
false signals);
- attach electronic module to shaft skids.
- connect searchcoil slot to the electronic
WARNING! Do not over tighten attachment and mounting fittings of the telescopic
shaft. This applies especially to the plastic screw of the searchcoil and collet
Power supply
The device is powered by 4 AA batteries or rechargeable cells.
Battery discharge control system automatically switches the device into power
saving mode when voltage is less than4.2V.
WARNING! Please insure that the battery (batteries) is properly installed
(installation polarity is shown on the battery compartment).
The device can be damaged in case of wrong polarity or power supply voltage.
Do not use dead batteries with fresh ones. It would cause immediate charge drop in this
set to the minimum.
Controls and connections
LCD graphic display, headphone jack and 7
detector control buttons are located on the front
panel of the device (see picture).
Searchcoil slot, on/off switch and battery
compartment are located on the rear panel of the
unit.
Control buttons.
«all metals – S menu». Switch between "discrimination" and "all metals" modes».
Switch to S menu holding the button.
«balance – V menu». Automatic ground balancing On. Switch device to manual
ground balancing mode pressing one more time. Switch to the video (V) menu holding
the button.
«М menu – М1 menu». Pressing this button enter the main settings menu.

Selective Metal Detector SOREX PRO. Operating manual.
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Switch to additional menu (M1) holding.
«plus» button. Change values in settings mode. Warning! In the search mode is
used as control button with pre-assigned mode (see below).
"minus" Change values in settings mode. Warning! In search mode is used for the
on the fly switch between "norm" and "metal trash" modes.
«search –static». Used to turn on/off of the static search mode (pinpoint).Also
exits settings modes (menu, ground balancing) in the search mode.
«А menu – А1 menu». Enter audio and video settings of the device. Switch to
additional audio menu (A1) holding
Device display
The display shows hodograph of the objects detected and operating information
on the search modes. VDI means Visual
Discrimination Indication.
VDI Index This is a so-called
electrical conductivity
indication of the object.
Angle between the vertical
axis and main direction of the
curl.
hodograph located in the left
part of the screen has
negative VDI and the right one
has positive VDI
Signal level - signal amplitude
from the object in arbitrary
units .
Device Settings
Warning! All changed settings remain in the device memory after the switch-
off, the device switches-on with latest settings.
All device settings are changed pressing and . Exit settings mode
pressing .
As it was mentioned in the introduction, you may set up two independent and
switchable on the fly blocks of settings or two independent search programs: for
algorithms MSF/SSF and for M/T (metal trash, FSF)
Factory settings are stored in device memory and user can revert to these settings
turning on the device and holding hold it pressed till the end of the melody.
VDI Index
Type of sound indication
Signal rating
ST Type
Battery level
Algorithm (MSF, SSF, MT)
Economy
mode
HR neutralization
mode
AGBT Mode

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«М» (main) menu
Enter "M" menu and browse its entries pressing several times on the device
panel. Set up parameters - pressing and . Press for exit or automatic exit 7
seconds after the end of the setting.
Menu entries.
1. Sensitivity
2. Threshold tone.
3. General Boost.
4. Left discriminator border.
5. Right discriminator border.
Sensitivity
This option allows adjusting sensitivity of your device.
You may change its value from 0 to 21.
Remember, increasing device sensitivity you get search depth
increase but it comes along with possible interference from
power lines and false responses from the searchcoil bumping
obstacles. Chose appropriate sensitivity at the search area taking into account the
formula "highest value appropriate for stable device operation in this area".
It is recommended to reduce device sensitivity in the areas with a lot of metal
trash. Due to strong random noise from a large quantity of surface iron the device is
unlikely to detect a coin located lower than this iron, while the depth is tolerable in the
clear area (it could be even deeper).
At the same time the device may not distinguish small nonferrous object (for instance, a
"flake" [small odd-shaped coin]) located on the same level as the iron or a bit higher,
from the total searchcoil "snap" including the deep iron.
While the device with reduced sensitivity will see this coin because it is not
dazzled by the iron below the coin.
To sum up all the above mentioned: high sensitivity does not guarantee high
search performance. Use this setting as the condition may demand and in accordance
with the search target.
Threshold tone
This option allows adjusting sensitivity (detection
depth) of the threshold tone of your device. The threshold
tone is a detection channel signal informing you of the metal
object detected by the device. After detection and during
searchcoil motion the sound volume of the threshold tone
increases, the highest value is above the center of the target.
Over device operation and acoustic experience gained, the combination of
threshold tone and identification signal tone, duration and loudness of threshold tone

Selective Metal Detector SOREX PRO. Operating manual.
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would give you the full information on the size and relative target depth.
Even two-target detection with one identification signal would be possible, but this is an
exigeant stunt. We recommend to set the threshold tone sensitivity to 16-17 in clear
areas and reduce it to the comfortable level in trashy areas.
Maximum values of threshold tone sensitivity exceed device ability to identify
target metal. That is why it may be applied for the search of metal objects at depths
impenetrable for the identification, when any metal object detection is essential.
General Boost (Gen. Boost) of searchcoil signal
Option allows to regulate searchcoil
signal boost for the detection channel (Threshold tone) and
identification channel (ST Sensitivity) simultaneously. Such
setting may be used in extremely trashy areas, beaches etc,
when there is no need in a great search depth, and distinction
of objects located close to each other is more important. In most cases we recommend
to set value to 6.
Left discriminator border
Use buttons and to set up left discrimination
sector border. All targets with VDI, as well as hodographs,
located to the right of this border, will give the sound signal
when they are detected by the device. Targets with VDI located
to the left of this border do not give sound response. VDI by regulated border is shown in
the frame.
Right discriminator border
Use buttons and to set up right
discrimination sector border. All targets with VDI, as well as
hodographs, located to the left of this border, will give the
sound signal when they are detected by the device. Targets
with VDI located to the right of this border do not give sound response.
Hodograph of the objects cut by the discriminator will be shaded VDI by
regulated border is shown in the frame.
«М1» (main additional)
To enter the «M1» menu press and hold . To browse its entries press
button several times several times on the device panel. Set up parameters -
pressing and . Press for exit or automatic exit 7 seconds after the end
of the setting.

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Menu entries
1. HRN mode (not available in the M/T mode).
2. Rate of AGBT (not available in the M/T mode).
3. FGR (false ground response) filter .
4. Algorithm (not available in the M/T mode).
HRN mode (hot rock neutralization)
This option allows to turn on/off non-discrimination
algorithm of hot rock signal neutralization.
When it is turned on, most of the round-shaped rocks do not
give identification signal, only the threshold tone with a light
sound increase appears. The search becomes more
comfortable in the area containing large quantities of such rocks, but it should be noted
that in the uneven and broken ground, for instance in the rough plow land, this algorithm
may detect some small targets in soil clods incorrectly and clip them out.
In such case they would give the threshold tone signal only, sharper and shorter
than rocks would. That is why in such places we recommend you to turn this algorithm
off.
Rate of AGBT(automatic ground balance tuning).
With this setting you can turn on/off automatic
tracing of ground balancing change and its correction by the
device during operation (for MSF and SSF algorithms only (see
below). When this setting is on, the display shows "A".
When this function is turned on, the device traces soil
mineralization, searchcoil heating and cooling and other factors, influencing the accuracy
of the device ground balancing, and it makes a correction allowing operator not to mind
changes himself and perform the ground balancing procedure less frequently. This option
is not recommended for use in trashy areas.
FGR (false ground signals) Filter
Option allows to select false signal block-out level, signals caused by high
conductivity of the ground (salty soil, sea beach etc).
It is particularly important when using large-size ( (10’ and 12,5’x9,5’) searchcoil
operating at high frequencies (14-20 kHz), that comes from the specific character of the
interaction of those searchcoils with the high-conductivity soils.
If you search in new area and notice that the device gives quite a few false
signals (FS) in clear zones with pre-set sensitivity, don't decrease sensitivity. It may lead
to the loss of deep targets. Use the FGR filter.
This filtering is a "softer" way to preserve deep search of the device with regard to
sensitivity decrease. It involves sophisticated multi-objective filtering algorithm.
Get comfortable (FS minimum) scanning of clear zones bringing up filtering level
gradually. Remember that excessive FGR filtering would cause missed targets in some
cases. Adequate filtering levels depend on various factors, such as soil mineralization and

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surface pattern, soil salinity which influence conductivity, searchcoil operating frequency.
A higher frequency will cause higher levels of selected filtering.
Algorithm (MSF/SSF/MT).
This option is meant for quick change of main
operating algorithms:
MSF –medium speed algorithm for clear and medium-trash
areas;
SSF –special algorithm with better identification of magnetic
properties of objects;
Warning! When target is scanned with the SSF algorithm, the scanning searchcoil
swings must fully cover target detection zone.
M/T (FSF) –fast algorithm for very trashy areas.
«A» audio menu
To enter «A» menu (audio menu) and browse it entries press several
times on the device panel. To set up parameters press and . Press for exit
or automatic exit 7 seconds after the end of the setting.
Menu entries
1. Sound Volume.
2. Sound Volume Fe.
3. Sound Volume of weak signals.
Sound Volume
This option allows to adjust device sound volume to your
own preference. External speaker turns off when the headphone
jack is inserted into the slot on the front panel and this option
allows to adjust headphone sound volume.
Sound Volume Fe
This option allows to make separate adjustment of
sound volume for iron only in order to increase comfort and
reduce sound overflow in the "all metals" mode. But this may
cause some reduction in sound descriptiveness. Adjust this
setting for the sake of your convinience.
Sound Volume of weak signals
Regulate sound volume weak ST signals from small
and deep targets. Low values of this parameter allow to control
signal level by the siund volume in wider range of their change.
However signals from small and deep objects might be too

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small. That is why this parameter is set up according to practical experience and personal
preferences of the user. Maximum sound volume will be similar for all signal levels.
«A1» additional audio menu
To enter the «A1» menu press and hold . To browse its entries press
button several times several times on the device panel. To set up parameters
press and . Press for exit or automatic exit 7 seconds after the end of
the setting.
Menu entries
1. Type of sound indication.
2. ST Type
3. LT border.
4. Startup melody.
Type of sound indication
This option allows to change type of sound indication
of the RT channel (threshold tone) between RT, RTT and RTM.
RT is the type of sound indication for the «all metals»
operation mode. Threshold detection tone works within the
total length of the signal from the object, no matter what the identification channel is
(ST), the combination of the threshold tone and ST gives total sound information on the
nature, size and depth of the target, but they are notable for high sound overflow that
may cause discomfort in trashy areas.
In sound indication RTT the threshold tone increases till the moment the device
is able to detect the metal the target is made of.
Once it is done, the threshold tone cuts down and the separate identification signal
sounds. This mode is less informative, but it is more comfortable and has no sound
overflow. In this mode the threshold tone may be turned off completely by decreasing its
sensitivity to 0 in the "M" menu when needed.
RTM sound indication type is a multi-tone signal of the detection channel (RT).
Its specialty is the real-time sound indication with the searchcoil approaching the target,
but unlike usual single-tone detection signal, this type of sound is based upon multi-tone
principal, which depends on the signal VDI.
In other words, the detector tries to identify a target as early as the searchcoil
approaches the target.
The described indication type is an additional one. It may be useful in case of big
signals from targets, for instance, in trashy areas.
ST Type

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This option allows to change type of sound indication
of the ST channel (short tone) between RT, PST and MST.
ST is the type of sound indication for the «all metals»
operation mode. Threshold detection tone works within the
total length of the signal from the object, no matter what the
identification channel is (ST), the combination of the threshold tone and ST gives total
sound information on the nature, size and depth of the target, but they are notable for
high sound overflow that may cause discomfort in trashy areas.
PST (polyphony short tone). For example, signal vectors of nails are located in
left corner of the screen. They have negative VDI. Signal vectors of coin-shaped
nonferrous targets are distributed in the right corner and their VDI is positive. This fact
defines the elegance of the sound indication of such targets.
Iron - low tone of SI, nonferrous targets - high tone. However, the practical experience
proves that there is a range of targets (iron plugs, caps, tin pieces) which have signal
vectors (hodographs) either in the left or in the right corner of the display, i.e. signal
phases may get any values during scanning from 0 to 180
The idea is to express this fact in the sound indication and make the polyphony short
tone - the number of tones with various frequencies which would define this class of
objects.
This is the essence of the PST. It is obvious that such mode is more informative but it
requires more trenchant hearing analysis related to practical skills.
MST sound indication type (modulated short tone). This option allows
increasing sound indication capabilities, making short tones more informative in weak
signal zones.
Tone modulation is made by the width of tone burst depending on the object
signal length and size of the object itself.
The option contribute greatly to the distinctions between false responses of
signal indication in the identification channel and signals from the objects.
LT (low tone) border
This option allows to move the sound border of
nonferrous low tone (LT) to the iron sector by the required
value.
It's well-known that small objects, especially pieces of
golden jewelry, as well as nonferrous targets "wiped out" by the ground mineralization or
slightly covered by the iron, quite often may give the "iron" signal in the minus sector of
VDI. But usually they give signal between medium - large iron and foil, and that allows to
identify them with no iron catch. Medium-large wrought iron (wrought nails) is located
approximately at -45 - 40 sectors of the VDI scale. The foil would be in sectors close to 0,
respectively, i.e. sectors 0 to -35 are "suspicious" and subject to exploration in terms of
beach jewel search, search for small medieval crosses or coins on the trash. Having
moved the LT border to the required sector you would not miss those targets on the iron
signal working in the «all metals» mode. It would give the nonferrous tone despite the
minus signal VDI. Pay special attention to the "coin" arrow or narrow hodograph loop of

Selective Metal Detector SOREX PRO. Operating manual.
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the signal in this sector. There is 95% probability that this is a nonferrous target. Together
with the speed of target distinguish in the "trash" mode this setting will increase your
chance not to miss nonferrous targets surrounded by the iron. Select value of the low
tone shift taking into account a specific search area, trying to hold it on the edge of the
iron common to the area. If you dig the area with an interesting medium-large iron
(arrow heads, medieval knives, locks, splinter holders, etc) you may shift nonferrous tone
to the medium-large iron sector -45 (maximum possible -50).
Startup melody
This option allows selection one of two startup
melodies of your choice or turn off the startup melody at all.
«V» video menu
To enter the «V» video menu press and hold several times on the device panel. To
browse its entries press the same button several times. To adjust parameters use buttons
and . Press for exit or automatic exit 7 seconds after the end of the
adjustment.
Menu entries
1. Contrast.
2. Weak signal scaling.
3. Storage.
Contrast
This option allows adjusting display contrast according to
ambient lighting and for better visual perception.
Weak signal scaling (Zoom weak sig.)
This option was brought to increase capabilities of visual
hodographic identification. It allows to increase sizes of weak
signal hodographs as well as to evaluate the signal level by the
size of the hodographic picture. For instance, setting up 1:2
scale you can increase and thoroughly examine a low-signal hodograph. Scaling 1:7 you
can evaluate signal levels in a wider range by the size of the picture respectively.
Storage (Accumulation)

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When the storage mode is "off" the display will show
only the hodograph of the latest target identified by the
device. Once the next target is identified, the previous
hodograph is deleted. Mode "2", "3" - the display also saves
hodographs from last two or three targets identified by the
device. "3" or "2" storage mode is more informative than the "off" mode, and it allows to
identify the target more accurately by means of several hodographs resulted from target
scanning from different angles.
«S» menu
To enter the «S» menu press and hold several times on the device panel.
To browse its entries press the same button several times.
To adjust parameters use buttons and . Press for exit or
automatic exit 7 seconds after the end of the adjustment.
Menu entries
1. F button.
2. Economy mode».
3. EMI filter.
F button
The programmable F button is intended for the quick
access to general modes during the search. The following
actions may be assigned to this button:
- Economy mode switch;
- change type of sound indication;
- change ST type;
- change main algorithm of searchcoil signal processing.
Pressing and .
Economy mode
The key feature of this mode is a shift to a low power
consumption resulted from the reduction of ECC excitation
current. Besides, this mode allows performing ground
balancing more accurately when working at the highly
mineralized sea beaches. This mode is recommended for trashy
areas where high sensitivity is not required.
Warning! Use button to switch the Economy mode on and off (assign the
appropriate function first, see above) during the search.

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The appropriate symbol (E) is shown in the bottom right corner of the display when the
"Economy" mode is on).
EMI filter (electromagnetic interference).
The search near sources of electromagnetic
interference is a common problem (overhead lines, pipelines
equipped with cathodic protection and so on). There are many
FS in such areas and the sensitivity of the device has to be
reduced with all the circumstances that follow. EMIF is
intended for the neutralization of such FS with the sensitivity preserved.
Set up the adequate filtering in the following manner: Increase this level gradually and
get comfortable hearing FS minimum from the EMI. Remember that excessive level of
EMIF may miss small targets and slow down device operation.
Ground balancing
Device ground balancing is the most important aspect of the device search
settings. Incorrect balancing may reduce search capabilities of the device, causing
unstable operation and false responses.
Brief description of the procedure. Each object has its own shape, conductivity
and magnetic compound, all of them are assumed to be VDI (Visual Digital Index). We
remind that VDI is an angle preference, its number equals to the inclination of the signal
vector (hodograph on the device display) from the vertical axis. The ground, depending
on the mineralization level (presence of iron oxides), covers target signal with its own
signal, changing its VDI till it "converts" small and deep targets, as well as large targets
made of high conductivity metals (copper, silver, aluminum), into the "iron". The
accurate detector ground balancing in the search area is performed in order to reduce
the ground influence to the minimum. Major balancing purposes:
1. To make the ground "invisible" for the device, i.e. avoid phantom signals
from the ground with no targets in it.
2. Set up correct (standard) reference system for VDI. Accurately balanced
device must cut-out ground signal mathematically and identify the target
correctly getting joint signal from target and ground.
It should be noted that during "air tests" the balanced device will keep making
correction for the ground ... which is not available at the moment. During an "air" test it
may lead to an "invisible" large aluminum or copper object (pan, 5 kopeks of Catherine II),
if the ground has got too deep into "plus". And if this "too deep" is too big, those targets
may be detected as "iron" ... and the tester might get very frustrated. Or, to the contrary,
it would decrease VDI of those targets, when balance gets too deep into "minus", and
sensitivity to them "in the air" goes up incorrectly ... resulting in unreasonable happiness
and hopes of the tester.
Memorize a simple formula: One degree of balance phase change gives VDI
change for all targets by the same one degree to the change direction (+ or -). I.e. if you
have 5 kopeks of Catherine II detected as "iron" "in the air" with VDI -86 instead of

Selective Metal Detector SOREX PRO. Operating manual.
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17
appropriate +82+84, then your device ground balance was set up by +10+12 degrees
more than required for the "air test".
Ferrite piece balancing is required before the "air test" of the device. Put the
device on the non-metal surface, turn on automatic ground balancing, count to three, and
set a piece of ferrite to the centre of the searchcoil surface from the distance of 25-30 cm,
finishing the balancing. Puzzled? Let's make it easier: Take a CD and pass it flatwise in
front of the searchcoil.
If the CD gives vertical hodograph and VDI within -1 0 +1, then the device is ready
for the "air" tests. If VDI of the CD differs from this values then in the manual balancing
mode (press twice ) correct the phase of the ground balancing by the difference
level and to the required direction. Did the CD get VDI -1 0 +1? Congratulations, your
device is ready for the "air battle".
Balancing Procedure.
We would like to bring your attention to the
automatic balancing procedure developed by experienced
users.
1. Find a metal-free area. You can find it by the threshold tone response in RT-ST
mode. On the unbalanced device there is a response to the pure ground, but the
sound would be quiet and "diffused", without strict localization, while the sound
would be sharp and with strict increase above the metal object. Select an area
with no localized sharp threshold tone increase swinging the searchcoil 5-10 cm
to the left and to the right above the ground. If there is no localized sharp
threshold tone increase, it is the area suitable for balancing.
2. Having found the metal-free area, raise the coil 30-40 cm above the ground,
press , wait for 3 seconds, and move the coil to the ground smoothly but
not slowly.
Warning! Do not move the coil to the ground closer than 10% of the searchcoil diameter
(for the searchcoilØ26 cm – 2-3 cm). It is related to the change in the pattern of the
searchcoil physical interaction with the ground in the so-called "Close Zone" and it may
impact balancing accuracy resulting in false responses in clear areas with high values of
sensitivity during search.
Short tone (thrum) notifies of the finished balancing. If there is no tone or it
does not sound during lowering, but sounds when moving up, repeat the procedure with
the same formula: 30-40 cm above the ground, 3 seconds, lower the coil to the ground.
Follow the ground vector on the screen in the process. It should shape as a strait, slightly
trembling line, on the horizontal axis of the scale. If it makes sharp angles or tear around
the screen, it means that you are trying to balance on the metal object in the ground.
In this case the device may balance but it would be incorrect for the operation, and you
will notice it by numerous phantom signals from the ground. If it happened, just
rebalance the device in the clear area. If you had balanced mistakenly in the area where

Selective Metal Detector SOREX PRO. Operating manual.
AKA LLC [phone]-0481 http://aka.2000.ru [e-mail]
18
the auto-tune system got frozen and could not rebalance (extraordinary but possible
event), don't worry and turn off the device, turn it on holding "+" button, similar to the
coil replacement procedure (see "Searchcoil Replacement Procedure").
After you have learned how to choose the balancing area, memorize the
approximate balance digit in lower left corner of the screen in the balancing mode.
Its sharp difference, especially in same weather conditions, during next balancing may be
caused by metal in the ground, and you should change the ground balancing area for
your device.
If there were a metal object under the coil that had not allowed to make automatic
balancing (objects with VDI close to 0; foil, for instance), then the device would give two
consequent short tones, with a tonality similar to the iron signal in the search mode, and
an exclamation mark in a triangle would popup on the screen with the sound.
So, the balancing should be performed in another area. The digital value of the balance
level (phase) pops up in lower left corner of the screen when balancing is over, this is the
value the device will use to correct the VDI of the target, eliminating the ground
influence. Digits, showing ground mineralization level will be displayed in the right
corner, in accordance with the device scale.
It is worth to mention that every device has a unique average angle of the
ground balance phase and may also depend on the technical parameter spread of the
searchcoil and ambient temperature.
But, taking those values into account, don not forget that your device stays in
the automatic balancing mode and it can elect to rebalance by ... a shovel, boots, your
partner.
That is why, if you want to review device screen and balance
numbers after the automatic balancing, press the button one
more time , and enter the manual balancing mode to turn
off the automatic mode.
Letter Р will replace letter А in lower right corner of the screen. To exit ground balancing
press several times on the device panel.
So, to enter manual balancing mode press buttons two times successively In this
mode use buttons and to adjust balance to the
required position, swing the coil vertically above the ground
(move up 20-30 cm/ move down 3-5 cm), keeping track of the
ground vector result getting in line with the horizontal axis of
the scale, and device move-up/down buzz should disappear.
Incorrect Ground Balance Vector (top picture). Correct Ground
Balance Vector (bottom picture).
On irregular mineralization soils, for instance on a plow
land, the device cannot always be accurately balanced in the
automatic mode, because when a vertical balancing is performed, there is one soil under

Selective Metal Detector SOREX PRO. Operating manual.
AKA LLC [phone]-0481 http://aka.2000.ru [e-mail]
19
the searchcoil (a clod or an air layer) and during scanning these pieces go one after
another, sometimes it leads to phantom responses of the device identification channel.
At the same time, ground phase digit in automatic balancing operation may differ by 3
degrees on the same place.
If you face such problem, perform manual ground balancing in the following way:
Find a clear area, 60 cm wide. Go to manual setup mode and making short horizontal
search passes (but quicker) with a 50 cm amplitude, 3-5 cm above the ground, you will
see a straight ground line on the screen (if it jerks, there is a metal).
Upon that, if the balance is incorrect, you will hear a buzz from the ground and
onscreen ground line won't be horizontal.
Use buttons and to make it horizontal, the buzz will stop, your
device is balanced accurately.
To increase the identification depth of large silver and copper coins (samovars,
bowls and other large objects made of high conductivity metals) slightly, after the
automatic balancing, it is possible, in the manual ground setting mode, to adjust the digit
of the balance phase by 1-2 degrees to the minus values.
Great adjustment (or drift) of the balance to the minus will lead to false
responses with nonferrous signal, when bumping the coil over the ground and plants.
Drift or correction of the ground balance to the plus would lead to low sensitivity to large
copper coins (5 kopeks of the Catherine II), such objects may even become invisible and
give "iron" response.
If, by any reason, there is no clear area found, the balancing may be performed
on a slice of excavated soil (1-1.5 kg), with all metal objects removed from it and having it
in a plastic bag for the sake of convenience.
After that fix the device and have its coil at the distance of 40-50 cm from the ground
(put it on a bush, rest it on a tree with a coil on top), turn ground balancing pressing
, count 1,2,3, and move the ground to the coil smoothly but not slowly from the
30-40 cm distance from the external or operating side.
(Similar to automatic balancing in the usual mode, but this time the soil has to be moved,
not the coil)
It is not recommended to put the device on the ground for such balancing.
Warning! If the ground signal is weak (quartz sand) to the extent that the balancing
program cannot run, it is possible to balance the device using a ferrite piece or a red
brick fragment automatically, putting them on the ground. Actually, an "air test"
balance is suitable on such ground and even with balance adjustment by couple
degrees to "minus" in order to increase sensitivity to large targets, if they are expected.
Sharp temperature changes on the searchcoil may impact balancing accuracy,
the balance may shift and become incorrect with such changes.
That is why, if you take the device from a heated car and start working in a low
temperature conditions (early spring, late fall), rebalance one or two times while the coil
adapts to the ambient temperature.
The t icon on the right corner of the screen will tell you that since the last balancing the

Selective Metal Detector SOREX PRO. Operating manual.
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20
temperature of the searchcoil has changed by the value (approximately 8° С) which
requires ground rebalancing .
In case of significant temperature drops (more than 15°С against normal +20°С)
we recommend to perform electronic module and searchcoil adaptation procedure one
more time (see Searchcoil Replacement).
In this case the processor of your detector will choose the optimum frequency of the
excitation current for these temperature conditions.
Thereby all basic device parameters are sure to be kept, including absorbed current.
In sea beach operations and other complicated soils with high conductivity we
recommend to use the "General Boost" option for better balancing accuracy.
Sometimes parameter decrease allows making balancing operation more accurate.
Especially on sea beaches.
Discrimination search mode setup
Discrimination is device capability to respond to one
type of objects, giving detection signal while ignoring other
objects the operator is not interested in, for instance,
nonferrous object signals only or large iron objects (helmets,
kettles, buckets), ignoring small and medium iron trash (nails).
This capability increases search comfort, but one should remember that a valuable object
may be missed in this mode. Anyway, you get to choose.
The discrimination range of your device is set up by the allowed width of the
search sector (a VDI sector between left and right borders of the discriminator).
When the discrimination mode is on your device will respond to objects with a
VDI and hodograph located within the allowed response sector only. For example, sector
covering almost all nonferrous objects and large-size iron objects (helmets, plow pieces,
kettles etc), and ignoring small, medium and medium-large objects made of iron, will
have the range of -30…+88. Sector with shotgun pellet, foil ... and small pieces of
jewelry, crosses blocked, will have the range of +10…+88.
Sector basically generated for the search for copper and silver coins of the
Russian Empire ... and other valuable objects blocked (crosses, flakes, golden 5 and 10
rubles coins of Nicholas II and others) will have the range of +50...+86.