COT NM-108 BC User manual

NIGHT VISION MODULE
COT NM-108 BC
Modern Optical Tec nologies

Safety Summary
Before operating this product, carefully read and study this Operation and Maintenance Manual.
The COT NM-108 BC night vision odule is a precision electro-optical instru ent and requires
careful handling. To avoid physical danger or equip ent da age when using the COT NM-108 BC,
follow all WARNINGS, CAUTIONS and NOTES.
Below you will find definitions of the alerts that appear throughout this Manual:
WARNING — Identifies a clear danger to the person operating the equip ent.
CAUTION — Identifies risk of da age to the equip ent.
NOTE — Serves to highlight essential procedures, conditions, state ents, or conveys i portant
instructional data to the user.
WARNINGS:
• When installing the equip ent on a weapon, be sure the weapon is clear and the safety is on
before proceeding.
• It is reco ended that you use an eyecup on the eyepiece of the day scope, allowing for the
eyepiece dia eter and eye relief and having side paddle preferably in order to escape detection.
• The light fro the infrared illu inator is invisible to the unaided eye. However, the light can be
detected by other night vision devices.
CAUTIONS:
• DO NOT dis antle the equip ent.
• Keep the equip ent clean. Protect it fro oisture, dra atic te perature changes, and electric
shocks.
DO NOT drop or hit the equip ent.
• Protect the equip ent fro overexposure to light: DO NOT activate the equip ent in daylight
with the objective lens cap re oved; DO NOT ai the equip ent at bright light sources (a fire,
car headlights, lanterns, street la ps, roo lights, etc.).
• DO NOT force the equip ent controls past their stopping points.
• DO NOT leave the equip ent activated during breaks in operation.
• Verify that the equip ent is off before installing a battery.
• DO NOT store the equip ent with the battery still in it.
• To avoid defor ation or da age, re ove the light suppressor fro the COT NM-108 BC
before placing the equip ent in storage.
• Thoroughly clean and dry each ite before placing the into the storage case.
NOTES:
• Optical axes of the COT NM-108 BC and day scope should align. It is not reco ended for the
distance between the axes to exceed 3 . If the difference in the axis heights of the COT NM-
108 BC and day scope above the weapon rail exceeds 3 , you will need to replace the day
scope ounting rings or onoblock.
• At operating te peratures below -20 °C, alkaline battery life will be severely reduced. Under
said conditions, the use of lithiu battery is reco ended.
• The equip ent requires so e level of a bient light ( oonlight, starlight, etc.) to function
correctly.

• Perfor ance of the device in nightti e conditions depends on the level of a bient light in the
environ ent. Please re e ber the following:
— The level of a bient light is reduced by the presence of clouds, shade, or objects that block
natural light (trees, buildings, etc.).
— The equip ent is less effective when operated in shadows and other darkened areas.
— The equip ent is less effective when operated in rain, fog, sleet, snow, dust or s oke.
— The equip ent will not “see” through dense s oke.
• For the purpose of returning defective co ponents, retain all packaging aterials.
How to Use T is Manual
USAGE
You ust fa iliarize yourself with this entire anual before operating the equip ent. Before
perfor ing any kind of aintenance on your COT NM-108 BC, read the section on aintenance in
its entirety. Follow all WARNINGS, CAUTIONS, and NOTES.
MANUAL OVERVIEW
The Manual contains sections on operating and aintaining the COT NM-108 BC night vision
odule.
Throughout this Manual, COT NM-108 BC will be referred to as the NM-108 BC , “the device”, or
“the equip ent”.
Reference data for the esti ation of a bient illu ination levels can be found in Appendix A.
C apter 1. INTRODUCTION
1.1 General Information
1.1.1 Type of Manual
Operation and Maintenance (including a List of Spare Parts).
1.1.2 Model Number and Equipment Name
COT NM-108 BC
1.1.3 Purpose of Equipment
The COT NM-108 BC is a night vision syste intended for use in conjunction with a dayti e sight,
or riflescope (hereafter referred to as a “day scope”). When ounted on a weapon in front of an exist-
ing day scope, the NM-108 BC adds to the scope’s capabilities a night vision function (up to range of
900 ), without affecting the boresight. Advisable day scope agnification values are 3 to 12X (4 to
10X are opti al).
The NM-108 BC is co patible with ost co ercial and ilitary specification day scopes, and fits
any Picatinny MIL STD 1913 or Weaver rail via the quick release ount.
An optional long-range IR-illu inator enables use of the NM-108 BC in extre ely low light condi-
tions or total darkness. Other additional equip ent, such as an infrared laser, red dot sight, etc., ay

also be installed on the NM-108 BC top Weaver rail.
NOTE:
The NM-108 BC can also be installed in front of the viewfinders of various instru ents to
widen the operational illu ination range.
C apter 2. DESCRIPTION AND DATA
2.1 System Description
The NM-108 BC consists of two pri ary parts, as shown in Figure 2-1: the night vision device
(hereafter referred to as NVD), and the quick release ount syste , or ount. The NM-108 BC is
delivered already asse bled: the ount (B) should be secured to the rail (A) of the NVD (D) with two
screws.
Figure 2-1. NM-108 BC NIGHT VISION CLIP ON SYSTEM
The optical-electronic syste of the NVD includes four ain co ponents: the objective and output
lenses, an i age intensifier tube, and the wired body (C).
The objective lens focuses available light (photons) on the photocathode of the i age intensifier tube
(IIT). The light energy causes electrons to be released fro the cathode. After being a plified, the
electron flow represents an intensified version of the original i age of the scene. The electrons then
strike the IIT phosphor screen, which reacts to the by glow that is visible to the hu an eye. The i -
age is projected by the output lens fro the IIT screen to infinity, and the resulting i age is agnified
when viewed through the day scope. As such, when the NM-108 BC ounted in front of the day
scope, it converts the latter into a night vision sight.
The auto atic brightness adjust ent syste aintains consistent i age brightness, even in changing
light conditions. The anual gain control (optional feature) allows the operator to refine the i age
contrast by co pensating for overly bright or extre ely dark conditions.
The bright light protection syste controls the existing a bient light through a photoreceiver, and
D
B
A
B
C

cuts off the IIT auto atically when the illu ination level exceeds the li it of 100…150 lx within 10
seconds. The NM-108 BC turns back on when re oved fro the excessive light.
The auto atic shut-off function preserves battery life should the NM-108 BC be inadvertently acti-
vated.
The NM-108 BC is powered by a single AA or CR123A battery.
The NM-108 BC uses a LED indicator to show the operator when the bright light protection syste is
activated, or to indicate a low battery.
The Picatinny / Weaver ount (B) has an adjustable lever-ca cla ping device for easy, quick and
reliable ounting and re oval of the NM-108 BC.
The NM-108 BC is shown in Figure 2-2. The ITEM NO. colu n in Table 2-1 indicates the nu ber
used to identify ite s in Figure 2-2.
Figure 2-2. NM-108 BC NIGHT VISION CLIP ON SYSTEM

TABLE 2-1. SYSTEM DESCRIPTION
ITEM DESCRIPTION ITEM DESCRIPTION
1 Photoreceiver 9 Focus Knob
2 Purge Screw 10 Nut
3 Pivoted Shutter 11 Turn Switch
4 Objective Lens Cap 12 Battery Cap with Adapter
5 Gain Control Knob 13 Control Co part ent
6 Top Weaver Rail 14 Main Body
7 Output Lens Cap 15 Ca Lever
8 Double Lever-Lock Quick-Release
Picatinny Mount
16
17
Lever Holder
Cla p
2.2 Specifications
TABLE 2-2. SYSTEM DATA
ITEM DATA
Magnification Unity (1X)
Boresight Characteristics:
—Accuracy
—Retention
—Repeatability
Factory aligned to 0.75 MOA or better
Per anent to within 1.5 MOA or better
Within 0.75 MOA
Syste Resolution subject to I age Intensifier Tube
Resolution:
—45 to 54 lp/
—55 to 64 lp/
—Over 65 lp/
0.23 rad/lp
0.19 rad/lp
0.16 rad/lp
TABLE 2-3. MECHANICAL DATA
ITEM DATA
Di ensions (L×W×H) 235×97×80
Weight (without Mount and Re ote Control) 0.91 kg
Weight of Mount 0.1 kg
Height of the NM-108 BC Axis above Weapon’s
Picatinny / Weaver Rail
40

TABLE 2-4. ELECTRICAL DATA
ITEM DATA
Battery Single AA (1.5V) or CR123A (3V)
Cell Life at 20°C 25 hr (1.5V) / 45 hr CR123A (3V)
Interrupting Ti e* 60 inutes
* — Optional feature. Interrupting Time setting can be changed at the production stage, or the
function can be completely disabled.
TABLE 2-5. OPTICAL DATA
ITEM DATA
Objective Lens Focal Length 108
Objective Lens F/nu ber 1:1.5
Focus Range 10 to infinity
Field of View 9o
Exit Pupil Dia eter 40
TABLE 2-6. ENVIRONMENTAL DATA
ITEM DATA
Operating Te perature -40 to +50 оС
Storage Te perature -50 to +50 оС
Illu ination Required Natural night illu ination (overcast
starlight to oonlight)
I ersion 10 for 30 inutes
MIL-STD-810 Co plies

2.3 Standard Components
The NM-108 BC standard co ponents are shown in Figure 2-3 and listed in Table 2-7.
The ITEM NO. colu n indicates the nu ber used to identify ite s in Figure 2-3.
Figure 2-3. STANDARD COMPONENTS
TABLE 2-7. STANDARD COMPONENTS
ITEM
NO.
DESCRIPTION Q-TY
1NM-108 BC Nig t Vision Clip-On System - a night vision device equipped with
quick release ount, to be installed on a Picatinny/ Weaver rail. Intended for use in
conjunction with a day scope.
1
2Wireless Remote Control Unit – used to operate the NM-108 BC in short-ti e
activation ode. Ensures quick and silent NM-108 BC activation / deactivation.
Delivered with two CR2016 (3V) batteries installed.
1
3Lig t Suppressor - a rubber cup installed on the NM-108 BC output lens to reduce
light scattering.
1
4Operation and Maintenance Manual - provides safety infor ation, equip ent
description, ounting procedures, operating instructions, and preventive
aintenance checks and services (including a List of Spare Parts).
1

5Special Wrenc - an instru ent used for repositioning the adapter in the NM-108
BC battery cap, depending on the battery being installed.
1
6CR123А Battery - a single lithiu battery used to power the NM-108 BC. 1
7Soft Case - used for carrying / storage of the NM-108 BC and its accessories. 1
2.4 Key Features
•Converts your dayti e scope, sight, or binoculars into a night vision ones
•Mounts in front of any day scope with no re-zeroing required
•Available in a variety of high perfor ing Gen 2+ and Gen 3 i age intensifier tube options
•Wireless re ote control
•Both auto atic and anual gain control
•Powered by a single AA or CR123A battery
•Bright light cut-off syste
•Bright light cut-off and low battery indications in the viewing area
•Interrupting ti e 60 inutes (optional feature)
•Filled with dry nitrogen to prevent internal fogging
•Mounts on Picatinny / Weaver rail with a quick release ount
•Mil Standard co pliant
2.5 System Limitations
The NM-108 BC requires so e a bient light ( oonlight, starlight, etc.) to operate. Factors that can
reduce natural night light and negatively affect the efficiency and operation of the NM-108 BC in-
clude: rain, fog, sleet, snow, and s oke; passing cloud cover and objects that produce shadows; and
low-contrast environ ents such as snow-covered territory, sandy deserts, large bodies of water or
grassy hills.
C apter 3. OPERATING INSTRUCTIONS
3.1 Installation and Mounting
CAUTION:
To protect the i age intensifier tube when the device is not in use or when it is being operated
in daylight, keep the protective objective lens cap securely fitted over the lens.
3.1.1 NM-108 BC Battery Installation
NOTE:
At operating te peratures below -20 °C , alkaline battery life will be severely reduced. Under
said conditions, the use of lithiu battery is reco ended.
CAUTION:
Ensure that the device is off before installing a battery.
Install the battery as follows (refer to Figure 3-1):
1. Unscrew the battery cap (E) and check the position of the adapter (D). See Figure 3-2 for the cor-
rect positioning of the threaded adapter, which changes depending on the battery being installed.
2. If necessary, change the adapter position in the cap. Use the special wrench.

3. Install the battery (C) into the battery co part ent (B). Follow the battery sy bol (A).
4. Replace the battery cap (E).
Figure 3-1. THE NM-108 BC. BATTERY INSTALLATION
Figure 3-2. POSITIONS OF THE ADAPTER IN THE BATTERY CAP
3.1.2 Installing t e NM-108 BC on a Picatinny / Weaver Rail
WARNING:
When installing the equip ent on a weapon, be sure the weapon is clear and the safety is on be-
fore proceeding.
WARNING:
It is reco ended that you use an eyecup on the eyepiece of the day scope, allowing for the
eyepiece dia eter and eye relief and having side paddle preferably in order to escape detection.