Armasight NRWVULCAN439DB1 Vulcan 4.5X Gen3 Bravo MG - Compact Professional 4.5x Night Vision Rifle Scope - Manual (Page 32)

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ate the device during missions. If you believe a cosmetic blemish is cause for returning the device, re-
cord the specific 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 flicker or appear constant (Figure 4-3).
Not all bright spots make the Vulcan returnable. 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 fluctuating 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 Vulcan. 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 intensifier 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 intensifier 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