Armasight NAMPVS1401F9DA1 PVS14 FLAG MG Multi-Purpose Night Vision Monocular - Manual (Page 29)

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(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 3-5). The position of an
emission point within the image area does not move.
Not all emission points make the MUNVM 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 operator’s ability to view the image or to perform the mission.
(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 view the
image or to perform the mission.
(4) Fixed-Pattern Noise. This is usually a cosmetic blemish characterized by a faint hexagonal (honey-
comb) pattern throughout the viewing area that most often occurs at high light levels or when viewing
very bright lights (see Figure 3-6). 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 the operator’s
ability to view the image or to perform the mission.
(5) Chicken Wire. An irregular pattern of dark thin lines in the field-of-view either throughout the
image or in parts of the image area (see Figure 3-7). 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 the operator’s ability to view the image or to perform the mission.
Figure 3-6. Fixed-Pattern Noise
Figure 3-7. Chicken Wire