AKA SIGNUM MFD 7272M GT User manual

Attention!
Please read this
manual thoroughly.
Firmware version 2.06
Discriminating Metal Detector
SIGNUM MFD 7272M
CLASSIK/GT/ICB
Manual (En)

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Departement of international trade: https://aka-md.com | [phone] | akadetecto[email protected]
Contents
GENERAL INFORMATION & DIFFERENCES...4-5
APPLICATION...5-6
PACKAGE CONTENTS...7
TECHNICAL SPECIFICATIONS...7-8
GETTING STARTED...8
POWER SUPPLY...8-9
CONTROLS AND CONNECTIONS...9-10
EXTERNAL REGULATOR INSRUCTION...11
DISPLAY BUTTONS...12-13
DISPLAY SCREEN...13-14
LANGUAGE SELECTION...14
CT SENSITIVITY , PB SENSITIVITY, VOLUME...14-16
GROUND BALANCE...17-18
BALANCING PROCEDURE...18-24
DISCRIMINATION MODE AND SETUP...24-25
SEARCH MODE «ALL METAL»...26
DYNAMIC AND STATICMODES OF OPERATION...26-28
MODE «TURBO»...28-29
MODE«ECONOMY»...29-30
MODE S ALGORITHM...30-31
MULTI-FREQUENCY...31-32
PARAMETER MENU (*SEARCH OPTIONS * DISPLAY SETTINGS * SOUND SET-
TINGS)...32-39
ADDITIONAL MENU (ADD. MENU) (* MENU OPTIONS * TONE SETTINGS *
TONE SETTINGS ST * OTHER SETTINGS * GS FILTER SETTINGS * DEEP ALGORITHM
SETTING)...39-44
USER PROGRAMS...44-46
DEEP PROGRAM (DP)...46-47
DEEP PROGRAM SETTINGS (* CHANGE SOUND SIGNALS DP * CHANGE FILTER PA-
RAMETERS DP * RECOMMENDATIONS FOR TARGET SIGNALS)...47-51
USING THE HODOGRAPH FOR IDENTIFICATION...51-52
REPLACING THE COIL...53-54
SEARCH AND IDENTIFICATION METHODS...54-58
SEARCHING FOR METAL OBJECTS WITH LARGE EDDY CUR-
RENT LOOPS...58-60
EXAMPLES OF SOME COMMON TARGET VDI`s...60-62
WARRANTY...62-63
QA/QC certicate...64

GENERAL INFORMATION
Metal detector SIGNUM MFD 7272M GT is designed to search for
and identify metal objects in the dielectric (dry sand, wood, etc.)
and low conducting media (soil, brick walls, etc.).
e manufacturer of metal detectors, AKA company and the center for
repair and maintenance service of metal detectors are located only in
Russia. For export, we have developed a more reliable metal detector,
specically for sale to the foreign market.
On the basis of the "Classic version", our specialists released a specially
upgraded Signum 7272M GT. is is a more reliable model of the met-
al detector, with an improved component base. Additional protection
against dust and moisture is installed.
DIFFERENCES
from Signum 7272M (classic)
e main dierence between the GT version and the standard version is
that we modify each device instrumentally, due to this the stability and
accuracy of the device have increased, which allows us to record weaker
signals. e analogue regulator allows to result the gain in accordance
with the ground conditions, also partial dust and moisture protection is
added, (it does not provide complete water protection). ermal stability
is improved. High recovery speed (optional).
As a result, we get the following features:
1 Increase of the device sensitivity. 2 Quiet signals are better recorded.
3 Greater performance on hard ground.
4 Work in a heavily littered with large iron place without losing small
targets.
5 Wider setting range through the use of a current switch and an ana-
logue regulator.
from Signum 7272M (pro)
1. Aer conducting a series of studies, we do not set the external speed
switch and Normal (factory) mode and made the Fast mode (speed-up)
- optional.
2. Own element base.
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3. Enhanced protection against dust and moisture from dropping it.
4. Lighter and more reliable iron bar.
from Signum 7272M (ICB)
ICB- Is simplied version of GT. In ICB only external regulators are
absent. (coil current switch and general gain control.)
APPLICATION
• Criminal;
• Engineering;
• Housing and community services, construction and re-ghters to
search for underground utilities, pipelines, cables, manhole wells etc.
• Archaeology and treasure search.
e device is designed to operate under the following conditions:
- Ambient temperature from -10 up to +40°c (-4 to 122 F);
- Relative humidity up to 98 per cent at temperature of 25°c (77 F);
- Atmospheric pressure from 650 to 800 mm Hg.
Signum MFD 7272M is an eddy current selective metal detector oper-
ating on the principle of induction balance. e main distinguishing
feature of the model is the use of the original soware and hardware
multi-frequency technology (MFT) allowing the use of any sensors we
produce, regardless of their operating frequency of size. at is, the de-
vice itself adjusts to the sensor.
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e main search mode of the device is dynamic, i.e. object detection
occurs only with constant movement of the sensor.
To determine the exact location of the detected object, the device has a
static mode of operation.
e device has two types of indication of object detection:
- sound programmable multi-mode
- visual (hodograph, VDI index, rating (level) of the PC signal)
e device implements two independent search channels: RT and ST.
e RT channel (real time, RT) is a detection channel and
operates in real time, i.e. sound indication is issued synchronously with
the movement of the sensor over the object. e sound indication in this
channel is a single-tone signal, the volume and frequency of which can
change as the object approaches the sensor. e duration of the sound
from the object can be judged on its approximate size.
When the signal from the object in the RT channel exceeds the level of
the set threshold value, the ST channel begins to work.
e ST channel (short tone, ST) is an object type identication channel.
If the threshold level of the signal from the object is exceeded, it is iden-
tied in the ST channel, then a short sound signal of the corresponding
tonality is issued, and the hodograph is displayed on the display screen.
e frequency of the short tone indicates the type of object (high tones
- non- ferrous metal, low tone - ferrous metal). e number of tones is
set by the user (by default - 4 tones for non-ferrous metals and 1 tone for
ferrous metal).
Each channel has its own independent sensitivity adjustment.
“catch” the object and indicate to the operator that there is something.
e Signum MFD 7272M GT is equipped with a programmable switch
mode of operation of the sensor at high current (Turbo), which allows to
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ere are two-frequency and three-frequen
cy coils of dierent sizes in the assortment
of the company. Frequency switching is
carried out by a toggle switch, which is
located on the coil itself. After switching the
frequency, it is necessary to re-balance the
ground.

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improve the ratio of useful signal / noise and increase the search depth.
Also in the device there is the possibility of compiling 4 options for cus-
tom search programs.
Also in the device there is the possibility of compiling 4 options for cus-
tom search programs. e metal detector is equipped with manual and
automatic ground balancing systems with the possibility of programma-
ble speed auto-tracking (AT).
PACKAGE CONTENTS
• e electronic unit with a telescopic pole...1 ea.
• Search coil - eddy current transducer (ECT)...1 ea.
• Magazine for 6 batteries (type AA)*...1 ea.
• Operators Manual...1 ea.
*) batteries sold separately
TECHNICAL SPECIFICATIONS
e maximum detection range of metal objects (air test with coil Ø260mm
DD) via RT:
• 25 mm dia. coin - 60 cm;
• Helmet - 150 cm;
Operating frequency range, kHz: -1.5...22
Indication modes:
• sound, 6 modes(RT, RT-M, RT-М99, RT-SТ, RTL-SТ, ST-P);
• visual (LCD display with a resolution of 128x64 pixels).
Search modes:
• All metals;
• sectored discrimination with 2 ° step
Control modes:
• Dynamic programmable;
• Static with adjustable threshold.
Power Supply: - 6 batteries (type AA (LR6));
Continuous operation time: - 6-7 hours in Turbo mode (Rechargeable
batteries 2500 mAh) – - 16-18 hours in normal mode.
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Overall dimensions, mm: - up to 30-40 hours in economy mode
• Telescopic rod - 1200 (max.);
• Electronic unit - 120х70х115;
• Search coils - Ø 260 / Ø 380 / 150*260 / 240*320 / Ø 150
Weight of the device(without batteries): - 1400 g. (telescopic pole)
- 1160 g. (S-shaped pole)
e device allows the ability to work in water depths of up to 2,5 meters,
without submerging the control box.
GETTING STARTED
Assemble the metal detector. To do this:
- install the appliance in a metal bar;
- tighten the Collet Chuck;
- install the inner (plastic rod) sensor;
- install the rod with the sensor in a metal bar to desired length, using
the tabs and holes in the rod
- tightly and evenly wrap the sensor cable around the rod. Freely hang-
ing cables can Cause falsing;
- connect the sensor connector to the electronic unit
WARNING! Do not over tighten the attachments and ttings for the tel-
escopic sha. is applies in particular to the plastic bolt for the search
coil and sha collets.
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Unlike the classic version
(plastic) anks to the metal
armrest, your metal detector
will not only become lighter,
but also it will be more relia-
ble in operation.
POWER SUPPLY
e device is powered using 6 AA
batteries or 6 rechargeable NIMH. Rechargeable batteries and charger

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are not included and must be purchased
separately. We recommend that you use
NiMH batteries from SANYO, ANS-
MANN 2500 capacity-VARTA or 2850
Ma/h. e use of standard alkaline bat-
teries is possible but not cost eective as
the rechargeable batteries pay o aer 4-5
recharges.
When using batteries, with a capacity of 2500 Ma/h, continuous opera-
tion is approximately 16 hours in the main mode, 30-40 hours in econo-
my mode, 6-7 hours in Turbo mode.
e consumption of the device also depends on the operating fre-
quency of installed sensor. At high frequencies, consumption decreases,
and at low frequencies, it increases.
Several recommendations on the use of nickel-metal hydride batteries:
- Remember that due to the self-discharge nature of the batter capacity
falls (by About 5% per day, so it is advisable to charge batteries before
each use.
-DO NOT use rechargeable batteries that have different capacities in the
same set. WARNING!
When connecting the battery magazine to the device connector insure
the battery is properly connected (polarity is indicated on the battery
cartridge) and insure the voltage source is correct. In the case of
incorrect polarity or improper voltage the device can be damaged.
CONTROLS AND CONNECTIONS
e device can be delivered in two design options (Fig. 2). In the rst
version (in the gure on the le) the option “compactness without
disassembly” is implemented due to the displacement of the middle
part of the bar into the armrest. e second option (in the gure on the
right) has a slightly lower weight and improved mechanical balance. e
company reserves the right to change and introduce new options for the
design of the device.

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On the front panel of the device there is a liquid crystal graphic indi-
cator (with a resolution of 128x64 pixels) and 11 control buttons. e
manufacturer reserves the right to change the design of the panel and
control buttons without prior notication.
On the back panel of the de-
vice there are a connector for
connecting a sensor, a switch
on / o the device and a serial
number. Only the GT model
has a switch for supplying cur-
rent to the coil and an addi-
tional gain control. (g. 3).
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(g. 3).