Shading - ATN NVM14 Operator's Manual

5.1. ZeROING OPeRATIONAL
dEFECTS
operational defects relate to the reliability of the image intensifier
and are an indication of instability. If identified, they are an imme-
diate cause for rejecting the atN NVM-14. they 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.

SHADING

NOTE
Make sure the shading is not the result of improper exit pupil
position.
5-2
FIGURe 5.1. ShADING