Night Optics D-930 Gen 3 Gated Clip-on Night Vision Scope - Manual (Page 8)

GLOSSARY OF TERMS
continued...
INFINITY FOCUS
Adjustment of the objective lens so that a distant object, such as a star or the point light on a distant tower,
forms the sharpest image.
MICROCHANNEL PLATE
A current-multiplying optical disk that intensifies the electron image produced by the photocathade.
NOTE
Essential information of special importance, interest, or aid in job performance.
PHOTOCATHODE
The input optic of an image intensifier that absorbs light energy and in turn releases electrical energy in the
form of an electron image.
SCINTILLATION
A faint, random, sparking effect throughout the image area. Scintillation is a normal characteristic of the
image intensifier assembly and should not be confused with emission points. Scintillation is more
pronounced under low-light conditions. Also called “video noise.”
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 intensifier.
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.
Check to make sure battery cap is
present and operable. Remove battery
and inspect for corrosion, moisture or
cracks. Ensure o-ring is present and is
not dry or cracked. Battery Cap retainer
is present and clear of damage.
Cap is missing,
corroded or
damaged. O-ring is
missing or cracked.
Battery Cap retainer
is missing or
damaged.
1.
2.
3.
Before/After
Before/After
Before/After
Optical Surfaces
Inspect lens for dirt, fingerprint residue,
chips, or cracks. If necessary, clean and
dry lens with water and lens tissue.
Scratches or chips
hinder vision with
device turned on, or
if cracks are present.
Inspect for cracks or damage. Scratches
and gouges are OK if Operation is not
effected.
External Surfaces Cracked or damaged.
Battery Cap/
Compartment
Item
#
Interval Procedure
Not Fully Mission
Capable if:
Location
(Item to
Check/Service)
PREVENTIVE MAINTENANCE CHECKS
6