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3-7
(1) Shading. If shading is present, you will not see a fully circular
image (see Figure 3.1). Shading is very dark and you cannot see
an image through it. Shading always begins on the edge and mi-
grates inward eventually across the entire image area. Shading is
a high contrast area with a distinct line of demarcation. Return the
NVFS to the maintainer.
(2) Edge Glow. Edge glow is a bright area (sometimes sparkling)
in the outer portion of the viewing area (see Figure 3-2).
To check for edge glow, block out all light by cupping a hand over
the objective lens. If the image intensifier is displaying edge glow
the bright area will still show up. Return the NVFS to the main-
tainer.
FIGURE 3-2. EDGE GLOW
(3) Flashing, Flickering, or Intermittent Operation. The image may
appear to flicker or flash. If there is more than one flicker, check
for loose battery cartridge or weak batteries. If weak or loose bat-
teries are not the problem return the NVFS to the maintainer.
C. Cosmetic Blemishes
These are usually the result of manufacturing imperfections that
do not affect intensifier reliability and are not normally a cause
for rejecting an NVFS. However, some types of blemishes can
get worse over time and interfere with the ability to perform the
mission. If you believe a blemish is cause for rejection, record
the specific nature of the problem on the maintenance forms and
identify the position of the blemish by using the clock method and
approximate distance from the center (e.g., 5 o’clock toward the
EDGE
GLOW
39


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