The AGM NVG-40 and NVG-50 are dual-channel night vision systems designed to intensify residual light reflected from surrounding objects, providing enhanced visibility in low-light conditions. These devices are precision optical instruments that require careful handling to prevent damage.
Function Description:
The NVG-40/NVG-50 operates by utilizing image intensifier tubes (IITs) to amplify available ambient light. Each unit features two monocular channels, each comprising a lens, an IIT, and an eyepiece. A single gain control knob manages the brightness for both channels, allowing users to optimize image quality. The binoculars are equipped with an infrared (IR) light-emitting diode (illuminator) to provide additional illumination, particularly useful for close-distance viewing (up to 3 meters) or reading maps in extremely dark environments. The device also incorporates a low battery indicator, a bright light cut-off system indicator, and an IR illuminator indicator, all visible within the field of view.
Usage Features:
The NVG-40/NVG-50 offers a range of features designed for versatility and user comfort:
- Mounting and Adjustment: The device allows for vertical adjustment (when used with a head or helmet mount), fore-and-aft adjustment, objective lens focus, eyepiece focus, and interpupillary distance adjustment. This ensures a customized fit and clear viewing for individual users.
- Operating Switch: A turn-pull operating switch controls the device's power and IR illuminator. Turning the switch to "ON" activates the NVG-40/NVG-50. To activate the built-in IR illuminator, the switch is pulled out and turned to the "IR" position, which also illuminates red LED indicators in both eyepieces. Rotating the switch back to "ON" deactivates the IR.
- Diopter Adjustment Rings: Each eyepiece has a separate diopter adjustment ring, allowing users to fine-tune the viewfinder for optimal image sharpness based on their individual eyesight.
- Focus Ring: The objective focus ring enables users to bring objects into sharp focus. Rotating it counter-clockwise typically adjusts for far focus, while clockwise rotation adjusts for near focus.
- Interpupillary Distance Adjustment: Knobs allow users to adjust the distance between the eyepieces, ensuring both eyes can observe the entire field of view simultaneously.
- Gain Control Knob: This knob adjusts the gain (brightness) of the viewed image, enabling users to balance the illumination input to their eyes for comfortable viewing.
- Indicators: The device provides visual indicators in the field of view: a red LED for activated IR illuminator, a green LED when image intensifier tubes are exposed to excessive light levels, and a flashing red LED for a low battery.
- Auto Power Off Function: To protect the intensifier tubes and conserve battery life, the NVG-40/NVG-50 features a bright light cut-off system that automatically shuts off power if exposed to excessive light for more than 10 seconds. The power will automatically resume when light levels decrease. Additionally, an automatic shut-off system turns off the device if unused (controls untouched) for 60 minutes, preventing inadvertent battery drain.
- Monocular Goggles Position: The rotating binocular design allows the unit to be used as a single monocular. Users can choose one side for night vision and rotate the other unit up and out of the way. The rotated unit will automatically power off and power back on when returned to the working position. This design also allows for a low profile against a helmet when stowed.
- Hands-Free Operation: The NVG-40/NVG-50 can be mounted to various helmet/headgear assemblies, including AN/PVS-7D, AN/PVS-14, AN/PVS-7A/C, AN/PVS-15, and AN/PVS-18 mounts, or mounts with a mini-rail interface. This allows the NVG to be positioned directly in front of the user's eyes or flipped out of the field of view.
- Battery Pack Compatibility: For extended run times, the NVG-40/NVG-50 can be used with an optional Battery Pack, which connects to the NVG Interface Shoe with Connector. The Battery Pack works in conjunction with the internal power source and can be installed on the back of a helmet using a Battery Pack Bracket or Velcro® Battery Case Holder. It can also be installed directly to the NVG Interface Shoe with Connector when used as handheld binoculars.
- Operating Under Changing Light Conditions: The automatic protective system will shut off the intensifier tubes if ambient light levels exceed a safe limit. For missions requiring operation in changing light conditions, users can manually shut down the protective system by closing the photoreceiver, though it is crucial to remember to reopen it afterward.
Maintenance Features:
Proper maintenance is essential for the longevity and optimal performance of the NVG-40/NVG-50:
- Battery Management: The device operates on a single CR123A or AA battery, with an adapter allowing for interchangeability. It is crucial to observe polarity markings during battery installation. The low battery indicator alerts users when replacement is needed. It is recommended not to store the equipment with batteries installed.
- Lens Protection: To protect the image intensifier tube, the lens cap should always be securely fitted over the objective lens when the device is not in use or when operating in daylight. Users should avoid scratching external lens surfaces or touching them with fingers.
- Cleaning and Storage: The equipment should be kept clean and protected from moisture, dramatic temperature drops, and electrical shocks. Before placing items into the storage case, they should be thoroughly cleaned and dried.
- Avoid Disassembly: Users are warned not to disassemble the device, as this can cause permanent damage. All service must be provided by the manufacturer.
- Operational Precautions: Users should avoid forcing equipment controls past their stopping points and should not leave the equipment activated during breaks in operation. Prolonged activation of the IR illuminator should be avoided to reduce the risk of detection by other night vision devices, especially in smoke, fog, and rain, where IR light is more easily detected.
- Daylight Operation: While the device can be operated in daylight for brief periods (no more than 10 minutes) with the daylight filter/lens cap on, prolonged exposure to bright light sources like firelight, headlights, or searchlights can damage the intensifier tubes.
The NVG-40/NVG-50 is a robust and adaptable night vision system, designed for reliable performance and user convenience in various low-light scenarios, provided proper operational guidelines and maintenance procedures are followed.
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