Shading - ATN PS-15 Operator's Manual

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
PS-15. These include shading, edge glow, flashing, flickering,
and intermittent operation.
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.
5-2