ATN PS28 Operator's Manual page 40

outside, 2:30 near the center, or 1:00 midway). The following are
cosmetic blemishes:
(1) Bright Spots. A bright spot is a small, nonuniform, bright area
that may flicker or appear constant (Figure 3-3). Not all bright
spots make the NVFS rejectable. Cup your hand over the objec-
tive lens to block out all light. If the bright spot remains, return
the NVFS to the maintainer. 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 ac-
ceptable if they do not interfere with the operator's ability to
view the image or to perform the mission.
EMISSION
POINT
BRIGHT
SPOT
FIGURE 3-3. BRIGHT SPOTS AND EMISSION POINTS
(2) Emission Points. A steady or fluctuating pinpoint of bright light
in image area that does not go away when all light is blocked from
the objective lens of the monocular (Figure 2.5.). The position of
an emission point within the image area does not move.
Not all emission points make the NVFS 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 in-
terfere with the operator's ability to view the image or to per-
form the mission.
(3) Black Spots. These are cosmetic blemishes in the image in-
tensifier or dirt or debris between the lenses. Black spots are ac-
ceptable 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 view the image or
to perform the mission.
3-8