Armasight NSGSPARK01CCIC1 Spark-G Night Vision Goggles - Manual (Page 30)

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NOTE:
Verify that any shading is not the result of improper eye-relief adjustment.
B. Edge Glow
Edge glow is a bright area (it sometimes appears to be sparkling) in the outer portion of the viewing
area (see Figure 4-2). To check for edge glow, block out all light from the device by cupping a hand over
the lens. If the image tube is displaying edge glow, the bright area will still show up; if edge glow occurs,
please contact Customer Support.
EDGE
GLOW
FIGURE 4-2. EDGE GLOW
C. Flashing, Flickering, or Intermittent Operation
The image may appear to flicker or flash. If there is more than a single flicker, check for a loose battery
adapter or a weak battery. If flickering continues, please contact Customer Support.
4.3.2 COSMETIC BLEMISHES
Cosmetic blemishes are usually the result of manufacturing imperfections. They do not affect the reli-
ability of the image intensifier, and are not normally a cause for returning the Spark. However, some
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 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 Spark 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 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 Spark. 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.