Selcom Security NR-900S User manual

PORTABLE
NONLINEAR
JUNCTION
DETECTOR
“ NR-900S ”
User manual
- 2013-

NR-900S Operation Manual
2
CONTENTS
1
Application.………………………………….
5
2
NR-900S complete set……………………….
6
3
Main technical parameters…………................
7
4
Function ………………………
8
5
5.1
5.2
5.3
5.4
Design ……………………………................
Main unit ………………………….…
NR-900S display …………………….…...
Control unit ……………………………....
Control panel………………………………
9
9
10
12
12
6
6.1
6.2
6.3
Accessories ……………………………..…
Imitator ………………………
NR-900S power supply…………………….….
Charger …………………………….
13
13
13
14
7
7.1
7.2
7.3
7.4
7.5
7.6
NR-900S operation
Operation condition and restriction
Getting started
NR-900S workability test
NR-900S safety precaution
Detector operation in 'LISTEN' mode
Detector operation in 'SEARCH' mode
15
15
16
19
20
21
22
8
Packing
23
9
Emergency actions
24
10
Battery charging
25
11
Maintenance ……………………………….
28
12
Shipping and storage …………………
30
13
Certificate of acceptance ……………………..
30
14
Warranty …………………………………..
31

NR-900S Operation Manual
3
This Manual is intended
for explanation
“NR-900S”Non-linear Junction Detector
design & principle of operation
as well as directions for its use.
For proper equipment use,
study this Manual in depth.

NR-900S Operation Manual
4
The Device has an open UHF radiator
of electromagnetic energy.
In active mode it represents
a source of active interference
that could cause certain malfunction
of radio-electronic equipment
located in close proximity
It is the responsibility of the User
to comply with the corresponding
Radio Communication Regulations
of the country
where ‘NR-900S’ NLJD is being used

NR-900S Operation Manual
5
1. APPLICATION
NR-900S Non-linear Junction Detector (fig. 1) is intended for
searching concealed eavesdropping devices as well as other
electronic items that contain semi-conductor elements.
NR-900S typical targets:
Radio-mikes
Microphone amplifiers
Wired mikes
Devices with IR or ultrasonic data
& control channels
Video & audio recorders
Electronic timers, actuating devices
of improvised explosive devices
(IED) and etc.
NR-900S can detect typical targets in every operational mode:
active, stand-by or even switched-off.
NR-900S ensures comprehensive searching capabilities and reliable
localization of ‘bugs’ in fabric constructions, furniture and various
office or home items.
NR-900S provides its operator with an opportunity to discriminate
between industrial electronic elements and metal-to-metal contacts,
so called ‘corrosion diodes’.
Fig. 1 NR-900S

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2. NR-900S COMPLETE SET (fig. 2) Table 1
1
NR-900S main unit with “Pistol-grip” and control unit
1
2
Carry bag
1
3
Headphones
1
4
Car power adapter
1
5
Soshine SC-S1 battery charger
1
6
AC power adapter
1
7
Target imitator (test unit)
1
8
Soshine 18650 rechargeable cells
4
-
Operation manual (not shown)
1
8
8
Fig. 2 –NR-900S
complete set
1
2
3
4
5
5
6
5
7
7

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3. MAIN TECHNICAL PARAMETERS
Target detection range
Standard imitator - test unit
(maximum probing signal output &
maximum receiver sensitivity
not less 1 m
Probing signal level -max
-mid
-min
0 dB
-6 dB
-12 dB
Receiver input signal attenuation
10 dB, 20 dB, 30 dB, 40 dB
Received signal level indication -visual
-audio
LED display
Headphones
Power supply
2 x ‘Soshine’ 18650 Li-ion
rechargeable cells
2800mAh, 3.7V
Operational condition:
Operating temperature
Storage and shipping temperature
Relative humidity (under +25°С)
+5°С … +40°С
Minus 20С … +50С
93±3 %
Continuous operation time with two
sets of fully charged cells
-Searchnig mode
-Listening mode
not less 8 h
not less 1 h
Weight
Device in a ready for operation state
Main unit
‘Pistol-grip’ control unit
Complete set in a standard packing
1.4 kg
1.0 kg
0.4 kg.
7.5 kg

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4. FUNCTION
NR-900S represents a portable tool that consists of antenna system,
transmitter and two receivers adjusted for double and triple
frequency of the transmitter’s signal.
Two operational modes are available: SEARCH and LISTEN.
In a SEARCH mode the probing signal is converted into a poly-
harmonic one on the radiated nonlinear elements (semi-conductive
items or corroded metal-oxide-metal junction) and retransmitted,
better say –scattered into ambient space.
Retransmitted 2nd & 3rd harmonics of the probing signal are received
and processed by receivers. Signals strength is indicated by LED
bar-graph display: scales 2and 3accordingly. Moreover, it is
reproduced via headphones in the form of interrupted beep-beep
audio signal. The audio signal volume is proportional to the received
harmonic signal level.
The receiver inputs switching as well as headphones volume control
is available from the device control panel.
NR-900S has three output levels for radiated probing signal with 6
dB step and four levels of the receiver input signal attenuation each
of 10 dB. The probing signal output level and receiver input signals
attenuation can be switched over by Control panel buttons. This info
is confirmed by LED display.
An auxiliary LISTEN mode is intended for the 2nd & 3rd harmonic
signals investigation for possible modulation imposed by internal
processes in some active electronic circuits irradiated by the probing
signal generated by NR-900S transmitter. At that, ‘active’ means the
circuit is in an operational mode carrying out its particular function.
Moreover, this can be done against the existing interference
environment.

NR-900S Operation Manual
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5. DESIGN
5.1 MAIN UNIT
NR-900S main unit (see fig.3) represents a mono-block that consists
of antenna system, electronic unit (transmitter with two receivers)
and LED display - indication panel (pos. 1).
A dedicated quick release plate (pos. 2) is placed on a back side of
the Main unit. It is supplied with pin connector (pos. 3) and intended
for easy coupling the Control unit.
NR-900S antenna system consists of two coaxial spiral directional
antennas (transmitting and receiving) attached to the 250 mm
reflector. Main lobes of antennas radiation pattern are oriented along
their geometrical axis.
NR-900S is made in dust- and waterproof version and has robust
enclosure, ensuring safe operation within wide range of
temperatures.
1
2
3
Fig. 3 NR-900S
Main unit.
1. NR-900S display
2. Quick release
base plate
with rotary latch
3. Pin connector

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5.2 NR-900S DISPLAY (fig. 4)
1. PWR - probing signal level 3 red LEDs indication. Each LED
corresponds to 6 dB output level increase.
If the LEDs are dead - the transmitter is off.).
2. 2nd harmonic bar-graph indicator (16 red LEDs).
3. 3rd harmonic bar-graph indicator (16 green LEDs).
NOTE: Both signal level bar-graph displays
are divided to 4 equal sections with 4 LEDs in each.
Every LED corresponds to 2.5 dB,
Thus every section matches to 10 dB
of a probing signal level harmonic - 2-nd or 3-rd.
4. ATT -received signal attenuation (4 blue LEDs). Each LED
corresponds to 10 dB attenuation.
When all four LEDs are on - the sensitivity is maximal.
5. SOUND –headphone commutation proof: 2or 3LEDs
corresponds to the 2nd or 3rd harmonics audio signal.
6. Operation mode indication: SEARCH, confirmed by blue
LED with pictogram, or LISTEN (the LED is dead).
SOUND
PWR
A T T
2
3
Fig. 4 –NR-900S display
1
2
3
4
6
5

NR-900S Operation Manual
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5.3 CONTROL UNIT.
The battery compartment for two Soshine 18650 rechargeable cells
is located inside the handle
(see fig. 7).
Fig. 6 –Control unit
1- Quick release
plug-in plate
2- Terminal block
1
2
Fig. 5 –Control unit
1 –Control panel
2 –‘Pistol-drip’ handle
3 –Headphones jack
2
1
3

NR-900S Operation Manual
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5.4 CONTROL PANEL (fig. 8):
PWR + &PWR – buttons (pos.1) are used for probing signal
output adjustment: + for increase and – for decreasing its level.
button (2) switches over the device’s operational modes:
SEARCH or LISTEN.
PHONE + &PHONE –
buttons (3) are used as
headphone volume control.
On button (4) serves for the
device switching on and off
2/3 button (5) is for 2nd & 3rd
harmonics output switching over
in LISTEN mode
ATT + &ATT – buttons (6) are
used for the receivers sensitivity
adjustment: + for the received
signal level increase (high
sensitivity - minimum signal
attenuation) and – for
decreasing the level (maximum
signal attenuation –low
sensitivity).
Fig.7 ‘Pistol-grip’ battery compartment (1)
and battery holder with cells (2)
1
2
1
3
2
4
5
6
Fig. 8 Control panel
PHONE
PWR
ATT
On
2 / 3
+
+
+
-
-
-
SOUND
ATT
PWR

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6. ACCESSORIES
6.1 IMITATOR
Target Imitator (test unit) is intended for NR-900S workability
control (fig. 9).
Imitator represents high-
frequency semi-conductor
diode (2D521A referring to
the Russian classification)
in a 14 x 165 mm solid
plastic body.
6.2 NR-900S POWER SUPPLY NR-900S power supple
is provided by the battery
of two Li-Ion
rechargeable cells -
18650 form factor (fig.
10). Cell rated voltage is
3.7V with 2800mAh
capacity.
For battery charging
Soshine SC-S1 max
Charger (supplied) is
used.
NOTE: After battery
discharge below 5,7 V :
two LEDs 2 and 3 of the
SOUND group (head-
phone commutation) are
lighten alternatively.
In this case replace the battery as soon as possible.
Fig. 10 Soshine 18650 cells
Fig. 9 NR-900S Imitator (test unit)

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6.3 CHARGER
Soshine SC-S1 max Charger (fig. 11) is intended for rechargeable cells
charging. The battery charging is performed in an automatic mode and does
not need any operator’s assistance.
NOTE:
Soshine AC adapter (fig. 11, pos. 3) allows to charge the battery
from the mains 100 –240 V, 50/60 Hz.
In case of another AC adapter in a supplied set –check its
parameters referring the label on AC adapter body.
Soshine DС12V car adapter (fig.11, pos. 2) is intended for battery
charging from the motocar 12V DC net.
Fig. 11 NR-900S standard Charger complete set.
1 –Soshine SC-S1 max charger unit
2 –Soshine DС12V car adapter
3 –Soshine AC power adapter
1
3
2

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7. NR-900S OPERATION
7.1 OPERATION CONDITION AND RESTRICTIONS
After long-term exposure to a low temperature keep the device
packed in a standard packing at least 2 hours for evening up its
temperature with the environment.
Operating NR-900S keep corresponding safety measures
Safety precautions for the open RF emitters:
-Do not direct NR-900S antenna to the human eyes from the
distance less than one meter.
-Avoid prolonged presence of personnel in a main lobe of NR-
900S antenna’ diagram.
NOTE: Probing signal power density at the distance of 1 meter
along the maximum of NR-900S antenna directional radiation
pattern does not exceed Russian State Standard 12.1.006-84
(Russian State Sanitary Norm) for UHF-equipment
serviceman under continuous 8-hours operation.
Keep NR-900S detector from mechanic damages and protected its
connectors from moisture and dirt.
Packing NR-900S into the bag use packing layout for reference
Wrong packing can lead to mechanic damage and breakdown of the
equipment.

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7.2 GETTING STARTED
Take NR-900S components out of standard packing.
Insert two fresh rechargeable cells (fig. 12) into the battery
compartment (1) keeping the cells polarity specified on the
compartment side wall (watch an arrow!).
Close the battery compartment cover (2-3) and lock it (4).
Watch cells polarity!
Fig. 12 Insert rechargeable cells
4
3
2
1

NR-900S Operation Manual
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Connect the Control unit to the main unit and fix it (fig.13):
- Turn quick-release-base-plate rotary latch (on the back side of the
Main unit) clockwise (fig. 11, step1)
- Insert plug-in plate (on the front side of any Control unit) into the
corresponding groove of the base plate (step 2)
- Fix Control unit turning the latch counter-clockwise and tighten it
(step 3)
- Plug headphones to the jack
on a side wall of Control unit
(fig.14).
Fig. 13 Control unit coupling
Main unit
Control unit
Fig. 14 Headphones
connection

NR-900S Operation Manual
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1. Push On button to switch on the device.
The following modes are set on default:
–transmitter is on (bottom PWR LED are on)
–receivers are on in a search mode ( LED is on)
–headphones are connected to the output of the 2nd harmonic (LED
2of SOUND scale is on)
–input signals attenuation is at -10 dB (bottom blue LED at ATT
scale is on )
–headphones volume control are in the middle position.
2. Use button ATT +to set maximal sensitivity of the receivers (all
LEDs of ATT scale are on).
3. Analyze the interference environment aiming antenna system to
different directions.
4. In case of noticeable interference, the antenna should be oriented
so that the interference signal is not heard in the headphones.

NR-900S Operation Manual
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7.3 NR-900S WORKABILITY TEST (fig.15)
-Reduce the output to the minimum level (only one bottom LED
PWR is on)
-Place standard imitator (item 7 at the fig. 2) in a space free from
any electronic equipment or gadget.
-Point out NR-900S antenna to imitator from the distance of 0,4 m
-Typical tonal audio signal will be head in the headphones while
several red LEDs will display the 2nd harmonic level
-Altering the target imitator location in front of antenna system try
to obtain the full 2nd harmonic LED-scale indication;
-Keeping imitator's relative position to the device Antenna system
press ATT –button to suppress receiver's sensitivity and control
corresponding 2nd harmonic LED-scale indication alteration.
Repeat this step.
-Press PWR + button to increase probing signal output verifying
corresponding PWR scale and 2nd harmonic LED-scale indication
alteration.
-Switch off the device
-NOTE: If the battery is low two LEDs 2 and 3 of the
SOUND group (headphone commutation) are lighten
alternatively. In this case the battery should be replaced.
NR-900S detector is ready for operation.
Fig. 15 NR-900S operation test by means of standard imitator
0.4 m
Imitator

NR-900S Operation Manual
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USEFUL HINT:
An original schematic design enables to supply NR-900S
operator with an outstanding feature: searching for illegal
electronics the NLJD user takes notice of an audio alarm
signal (tiny beep-beep) prior to custom LED indication.
This point is very important when an operator (a sapper) is
searching for such a dangerous target like IED, and all his
attention (and eyesight) is concentrated on the
environment that might conceal a mine (not blinking lights
on display).
7.4 NR-900S SAFETY PRECAUTIONS
NR-900s Detector represents a high sensitive radio-electronic
device. Getting started remove from the your pockets and outfit any
items that contains semi-conductive components.
Searching for radio-electronic devices that are in active mode,
please, take into account that pulse EM signals radiated by Detector
can affect the function of these devices.
Searching for improvised explosive devices (IED), start from the
position not less than 10 meters from the area to be inspected.
Keep antenna head at least one meter from the article or surface
under control.
To avoid accidental triggering of a target, reduce output power to its
minimum level immediately after receiving a steady signal.