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5-1 ZEROING OPERATIONAL DEFECTS
Operational defects refer to the reliability of the image inten-
sifiers and are an evidence of instability. Their identification
shall be a valid reason to immediately refuse to accept the ATN
and intermittent operation.
A. SHADING
If shading is persistent, you will not see a fully circular 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.