Night Optics D-930 Gen 3 Gated Clip-on Night Vision Scope - Manual (Page 10)

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2) Edge Glow - Edge glow is a bright area (sometimes sparkling) in the outer portion of the
viewing area. To check for edge glow, block out all light by cupping a hand over the lense. If
the image tube is displaying edge glow the bright area will still show up. Return the NO/D-930
to the manufacturer.
3) Flashing, Flickering, or intermittent Operation - The image may appear to flicker or flash.
If there is more than one flicker, check for loose battery cap or weak battery. If the battery
check doesn’t correct problem, Return the NO/D-930 to the manufacturer.
COSMETIC BLEMISHES
These are usually the result of manufacturing imperfections that do not affect image intensifier
reliability and are normally not a cause for rejecting the NO/D-930. However, some types of
blemishes can get worse over time and interfere with the ability to perform the operation. The
following are cosmetic blemishes:
1) Bright Spots - A bright spot is a small, nonuniform, bright area that may flicker or appear
constant. Not all bright spots make the NO/D-930 rejectable. Cup your hand over the lense to
block out all light. If the bright spot remains, return the NO/D-930 to the manufacturer. Bright
spots usually go away when the light is blocked out. Make sure any bright spot is not simply a
bright area in the scene you are viewing. Bright spots are acceptable if they do not interfere
with the ability to view the outside scene and the ability to perform the operation.
2) Emission Points - A steady or fluctuating pinpoint of bright light in the image area and
does not go away when all light is blocked from the objective lens of the device. The position
of the emission point within the image area does not move. Not all emission points make the
NO/D-930 rejectable. Make sure any emission point is not simply a point light source in the
scene you are viewing. Emission points are acceptable if they do not interfere with the ability
to perform the operation.
3) Black Spots - These are cosmetic blemishes in the image intensifier or dirt or debris
between the lenses. Black spots are acceptable as long as they do not interfere with viewing
the image. No action is required if this condition is present unless the spots interfere with the
operator’s ability to perform the operation.
4) Fixed-Pattern Noise - This is usually a cosmetic blemish characterized by a faint hexagonal
(honeycomb) pattern throughout the viewing area that most often occurs at high-light levels
or when viewing very bright lights. This pattern can be seen in every image intensifier if the
light level is high enough. This condition is acceptable as long as the pattern does not interfere
with viewing the image and interfere with the ability to perform the operation.
5) Chicken Wire - An irregular pattern of dark thin lines in the field of view either throughout
the image area or in parts of the image area. Under the worst case condition, these lines will
form hexagonal or square-wave shaped lines. No action is required if this condition is present
unless it interferes with viewing the image and interferes with the operator’s ability to perform
the operation.
OPERATIONAL DEFECTS
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