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NVS 6
MANUAL
Page 30
right eye, as well as clear view of the surrounding space by shifting gaze
downwards under the eyepieces of the night-vision goggles.
Note – If the RH side monocular of the night-vision goggles fails to
be set to the position at which the sighting line of the pilot’s eye passes
through its center, the position of the RH side monocular shall be
corrected by moving the night-vision goggles upwards or downwards,
right or left relative to the helmet. To do so, the carriages of helmet mount
(26) should be shifted by the adjustment of screws (16) utilizing the
screwdriver provided (Ref. Fig. 6.6). On completion of the corrective
actions, perform the operations described in this step once again.
6.2.19 Carry out the operations prescribed by Step 6.2.8 of this
Manual to finally adjust the interpupilary distance.
Make sure that the full field of view of the night-vision goggles is
provided for both eyes.
6.2.20 Adjust the eyepieces to the appropriate dioptric sighting by
turning rings (17) (Ref. Fig. 6.5) of the eyepieces until a sharp structural
image of the screens on the image-intensifier tubes is attained.
6.2.21 Evaluate the operational status of the night-vision goggles
by checking the image quality (resolving power). For this purpose, take a
test pattern, from the single set of spare parts and arrange it at a distance
of an outstretched hand away from the lenses ((750±16) mm). The
settings of the night-vision goggles are considered to be normal if the test
pattern lines are clearly visible and the check text is readable. Both
monoculars should operate without flashes and twinkling.
CAUTION: THE SERVICEABILITY CHECK OF THE NIGHT-
VISION GOGGLES SHALL BE ACCOMPLISHED IN THE PRESENCE
OF LIGHT WITH THE LENSES COVERED BY THE SAFETY CAPS.
6.2.22 De-energize the night-vision goggles (Ref. Step 6.2.9 of this
Manual).