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5-2
5.1 ZEROING OPERATIONAL DEFECTS
Operational defects relate to the reliability of the image intensi-
fier and are an indication of instability. If identified, they are an
immediate cause for rejecting the ATN NVM-14. They include
shading, edge glow, flashing, flickering, and intermittent opera-
tion.
A. SHADING
If shading is persistent, you will not see a fully circular image
(Figure 5.1). Shading is very dark and you cannot see an image
through it. Shading always begins on the edge and migrates
inward eventually across the entire image area. Shading is a
high contrast area with a distinct line of demarcation. Contact
ATN or point of purchase for warranty/repair procedures.
Figure 5.1
Shading
NOTE
Make sure the shading is not the result of improper exit pupil
position.
SHADING
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