OVN-1

     The OVN-1 helicopter pilot’s night vision goggles (NVG) are intended for observing objects outside helicopter at low light levels during take-off, nap-of-the-earth and low-altitude flying, object search and location, landing onto unlit pads, rescue operations.
     The NVG are binoculars, built around two 2nd-plus/3rd-generation bi-planar image intensifying tubes, featuring a 18-mm photocathode with high spectral sensitivity. The goggles are fitted with the built-in automatic brightness control system, sensitive to external illumination changes.
     The OVN-1 night vision goggles are designed for fitting different types of flight crew crash helmets, e.g. ZSh-7B.
Basic Specifications
Field of view, deg - 38; Magnification, power - 1x; Resolution, milirad - 1.5; Diopter adjustment, diopter from - 4 to +4; Interpupillary adjustment, mm - 55.3-72.7; Operating temperature range, ˚C - from - 40 to +40; Power supply, V: aircraft electrical system - 24-29, autonomous source - 2.5-3.5; Power consumption, W - not more than 3; Time of continuous operation, h - at least 2; Weight, kg: in work-ready condition - 0.66,  in a case with SPTA - 6.8; max overall dimensions, mm: night vision goggles - 100x135x90; night vision goggles in case - 280x358x178.