Specifications

SHADING

FIGURE 41. SHADING

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 icker or ash. If there is more than a single icker, check for a loose battery

adapter or a weak battery. If ickering continues, please contact Customer Support.

4.3.2 COSMETIC BLEMISHES

Cosmetic blemishes are usually the result of manufacturing imperfections. They do not aect the reli-

ability of the image intensier, and are not normally a cause for returning the Sirius. 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 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 Sirius 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.