Technical data

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typesofcosmeticblemishescanworsenovertimeandinterferewiththeuser’sabilitytoproperlyoper-
ate the device during missions. If you believe a cosmetic blemish is cause for returning the device, re-
cord the specic nature of the problem on the maintenance forms and use the clock method to identify
the position of the blemish and its approximate distance from the center (e.g., 5:00 toward the outside,
2:30 near the center, or 1:00 midway).
The following are examples of cosmetic blemishes:
A. Bright Spots
A bright spot is a small, non-uniform bright area that may icker or appear constant (Figure 4-3).
Not all bright spots make the NYX-14 rejectable. Cup your hand over the lens to block out all light. If the
bright spot remains please contact Customer Support.
Brightspotsusuallygoawaywhenalllightisblockedout.Verifythatanybrightspotsarenotsimplythe
result of bright light in the area you are observing. Bright spots are acceptable if they do not interfere
withtheuser’sabilitytoviewthesceneorperformmissions.
B. Emission points
Emission points are steady or uctuating pinpoints of bright light in the image area that do not go away
when all external light is blocked from the objective lens (Figure 4-3). The position of an emission point
withintheimageareadoesnotmove.NotallemissionpointsarecausetoreturntheNYX-14.Verifythat
emission points are not simply light sources present in the scene you are observing. Emission points are
acceptableiftheydonotinterferewiththeuser’sabilitytoperformmissions.
BRIGHT
SPOT
EMISSION
POINT
FIGURE 43. EMISSION POINTS AND BRIGHT SPOTS
C. Black Spots
Black spots are cosmetic blemishes in the image intensier or debris between the lenses. Black spots
areacceptableaslongastheydonotinterferewiththeuser’sabilitytoobservethescene.Noaction
isrequiredifthisconditionispresent,unlessthespotsinterferewiththeoperator’sabilitytoperform
missions.
D. Fixed-pattern Noise
Fixed-pattern noise is usually a cosmetic blemish characterized by a faint hexagonal (honeycomb) pat-
tern that appears throughout the viewing area. This typically occurs in excessively lit environments or
when viewing very bright lights (See Figure 4-4). This pattern can be seen in every image intensier if
the level of light is high enough. This condition is acceptable as long as the pattern does not interfere
withtheuser’sabilitytoviewanimageorinterferewiththeirabilitytoperformmissions.
FIGURE 44. FIXEDPATTERN NOISE