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5.1. ZEROING OPERATIONAL
DEFECTS
Operational defects refer to the reliability of the image intensi-
fiers and are an evidence of instability. Their identification shall
be a valid reason to immediately refuse to accept the ATN PS15.
These include shading, edge glow, flashing, flickering, and inter-
mittent operation.
5.1.1. 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 in-
ward 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.
SHADING
NOTE
Make sure the shading is not the result of improper exit pupil
position.
5-2
FIGURE 5-1. SHADING
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