Armasight NAM601500126DH1 PVS14/6015 GEN 2+ HD Multi-Purpose Night Vision Monocular - Manual (Page 28)

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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 returnable. Verify that any emission points are not simply a
point light source in the distance of 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 the operator’s ability to view 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. This most often occurs when operating in highly lit envi-
ronments or when viewing very bright lights (see Figure 3-6). This pattern can be seen in every image
intensifier if the level of light 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 im-
age or in parts of the image area (see Figure 3-7). In the worst cases, 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