NIGHT VISION MODULE COT NM-108 BC Modern Optical Technologies
Safety Summary Before operating this product, carefully read and study this Operation and Maintenance Manual. The COT NM-108 BC night vision module is a precision electro-optical instrument and requires careful handling. To avoid physical danger or equipment damage 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 equipment.
• • Performance of the device in nighttime conditions depends on the level of ambient light in the environment. Please remember the following: — The level of ambient light is reduced by the presence of clouds, shade, or objects that block natural light (trees, buildings, etc.). — The equipment is less effective when operated in shadows and other darkened areas. — The equipment is less effective when operated in rain, fog, sleet, snow, dust or smoke. — The equipment will not “see” through dense smoke.
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 instruments to widen the operational illumination range. Chapter 2. DESCRIPTION AND DATA 2.1 System Description The NM-108 BC consists of two primary parts, as shown in Figure 2-1: the night vision device (hereafter referred to as NVD), and the quick release mount system, or mount.
cuts off the IIT automatically when the illumination level exceeds the limit of 100…150 lx within 10 seconds. The NM-108 BC turns back on when removed from the excessive light. The automatic shut-off function preserves battery life should the NM-108 BC be inadvertently activated. 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 system is activated, or to indicate a low battery.
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 Compartment 6 Top Weaver Rail 14 Main Body 7 Output Lens Cap 15 Cam Lever 8 Double Lever-Lock Quick-Release 16 Lever Holder Picatinny Mount 17 Clamp 2.2 Specifications TABLE 2-2.
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 Time* 60 minutes * — 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 Objective Lens Focal Length Objective Lens F/number DATA 108 mm 1:1.5 Focus Range 10 m to infinity Field of View 9o Exit Pupil Diameter 40 mm TABLE 2-6.
2.3 Standard Components The NM-108 BC standard components are shown in Figure 2-3 and listed in Table 2-7. The ITEM NO. column indicates the number used to identify items in Figure 2-3. Figure 2-3. STANDARD COMPONENTS TABLE 2-7. STANDARD COMPONENTS ITEM NO. DESCRIPTION Q-TY 1 NM-108 BC Night Vision Clip-On System - a night vision device equipped with quick release mount, to be installed on a Picatinny/ Weaver rail. Intended for use in conjunction with a day scope.
5 Special Wrench - an instrument used for repositioning the adapter in the NM-108 BC battery cap, depending on the battery being installed. 1 6 CR123А Battery - a single lithium battery used to power the NM-108 BC. 1 7 Soft Case - used for carrying / storage of the NM-108 BC and its accessories. 1 2.
3. Install the battery (C) into the battery compartment (B). Follow the battery symbol (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 the NM-108 BC on a Picatinny / Weaver Rail WARNING: When installing the equipment on a weapon, be sure the weapon is clear and the safety is on before proceeding.
NOTE: Optical axes of the NM-108 BC and day scope should align. It is not recommended for the distance between the axes to exceed 3 mm. If the difference in the axis heights of the NM-108 BC and day scope above the weapon rail exceeds 3 mm, you will need to replace the day scope mounting rings or monoblock. The NM-108 BC on Picatinny rail in front of a day scope is shown in Figure 3-3. Install the NM-108 BC on a Picatinny / Weaver rail in front of a day scope as follows: 1.
Figure 3-5. MOUNT. UNDERSIDE VIEW 3.1.3 Clamping Device Adjustment Adjust the mount clamping device as follows (refer to Figure 3-6): 1. Remove the NM-108 BC from the weapon. 2. With the clamping device unlocked (as shown in Figure 3-6), push the cam (B) towards the arrow, which will cause the nut (A) to slide out of its hollow. 3. To tighten / loosen the clamping device, push down on the cam (B) and turn the nut (A) CW/ CCW respectively, in one-two increments (see note below).
3.1.4 Fastening Remote Control Unit to Weapon Using Velcro tape (A), fasten the wireless remote control unit (B) (Figure 3-7) to a weapon in an eas ily accessible place (e.g., on the front of the rifle stock) on the side of the NM-108 BC’s control compartment preferably. If the rifle has a Picatinny or Weaver rail on the forend you can use the Picatinny adapter for the wireless remote (C). Install adapter on the rail. Insert the wireless remote control unit in the adapter. Figure 3-7.
Figure 3-8. NM-108 BC CONTROLS TABLE 3-1. NM-108 BC CONTROLS AND INDICATORS ITEM NO. CONTROL / INDICATOR FUNCTION 1 Pivoted Shutter Closes / opens the photoreceiver when placed in the highest / lowest position. 2 Gain Control Knob Adjusts the brightness of the image. 3 Turn Switch Switches on the NM-108 BC, when turned CW from OFF to ON position. NOTE: Both ON and STB positions can only be entered if the switch is unlocked by pushing the spring-loaded stop (5) before turning.
3.3 Operating Procedures 3.3.1 Operating NM-108 BC Operating procedures should be performed in night light conditions only. CAUTION: USE OF THE CO-LR IN BRIGHTLY LIT CONDITIONS MAY DAMAGE THE IMAGE INTENSIFIER TUBE. CAUTION: PAY ATTENTION TO THE CAUTION NOTICE ON THE OBJECTIVE LENS CAP: “DO NOT REMOVE IN DAYLIGHT”. 1. Verify that the battery is installed as required. 2. Perform a visual estimation of the illumination level in the viewing area, using the reference data presented in Appendix A.
3.3.2 Operating in Changing Light Conditions If a mission must be carried out in changing light conditions, you can deactivate the bright light protection system of the NM-108 BC. To shut down the protection system, close the photoreceiver by flipping up the pivoted shutter. CAUTION: AFTER YOUR MISSION IS COMPLETE, OPEN THE PHOTORECEIVER BY FLIPPING THE PIVOTED SHUTTER DOWN. 3.3.3 Shut-Down Shut-down the NM-108 BC as follows: 1. 2. 3. 4. 5. 6. Turn the device OFF. The green glow will disappear.
TABLE 4-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES SEQ. NO. ITEM TO CHECK CHECKING PROCEDURE NOT FULLY MISSION CAPABLE IF: BEFORE OPERATION CHECKS 1 Completeness Inventory items by comparing them with the data Items are missing. specified in this manual. 2 Body Inspect for cracks or damage. Scratches and Cracked or damaged. gouges are OK if operation is not affected. Inspect Purge screw or knob for missing parts (purge screw, knobs). is missing.
CAUTION: DO NOT forget to open the photoreceiver after finishing operational checks 13 NM-108 BC Switch Insert the battery. Remove the output lens cap. No green glow. Close the photoreceiver by flipping up the pivotal shutter. Turn the switch to ON position. Look for green glow (after a slight delay) in viewing area. Open the photoreceiver by flipping the pivotal Green glow is shutter down. Look through the output lens and present, yellow glow wait about 10 seconds for green glow to disappear. is absent.
TABLE 4-2. OPERATOR TROUBLESSHOOTING MALFUNCTION PROBABLE CAUSE / TEST/ INSPECTION Equipment fails to activate. Battery is missing or improperly installed. Battery is dead. Battery surfaces or contacts are dirty or corroded. Poor image quality. Check focus. Objective and output lenses are dirty. Damaged optical components. CORRECTIVE ACTION Insert battery or install it correctly. Replace battery. Clean the contact surfaces with a pencil eraser and / or alcohol and cotton swabs.
Figure 4-1. SHADING NOTE: VERIFY THAT ANY SHADING IS NOT THE RESULT OF IMPROPER EYE-RELIEF ADJUSTMENT. B. Edge Glow Edge glow is a bright area (it sometimes appears to be coloring) in the outer portion of the viewing area (see Figure 4-2). To check for edge glow, block out all light from the device by cupping a hand over the lens. If the image intensifier tube is displaying edge glow, the bright area will still show up; if edge glow occurs please contact Customer Support. Figure 4-2. EDGE GLOW C.
A. Bright Spots A bright spot is a small, non-uniform bright area that may flicker or appear constant (Figure 4-3). Not all bright spots make the NM-108 BC returnable. Cup your hand over the lens to block out all light. If the bright spot remains, please contact Customer Support. Bright spots usually go away when all light is blocked out. Verify that any bright spots are not simply the result of bright light in the area you are observing.
E. Chicken Wire Chicken Wire is an irregular pattern of dark thin lines that can appear in the field of view, either throughout the image area or in sections of the image area (See Figure 4-5). In the worst-case sce nario, these lines will form hexagonal or square, wave-shaped lines. No action is required if this condition is present, unless it interferes with the user’s ability to view an image or their ability to perform missions. Figure 4-5. CHICKEN WIRE 4.4 Maintenance 4.4.
4.4.3 Battery Removal and Replacement Refer to Parts 3.1.1 for the NM-108 BC battery installation procedure, respectively. Replace the remote control batteries as follows: 1. Using a screwdriver, unscrew the four screws (A, Figure 4-6) that affix the cover to the bottom of the unit. Remove the cover. 2. Replace the batteries with two new ones (CR2016, 3V).
