Manual

12
SHADING. The viewed image should be a full circle. If shading is present, you will not see a fully circular
image. Shading is indicative of a dying photocathode and is caused by a defective vacuum seal of the
image intensier. Shading is very dark and you cannot see an image through it.
WARNING. Conditions, practices, or procedures that must be observed to avoid personal injury or loss
of life.