Night Optics D-930 Gen 3 Gated Clip-on Night Vision Scope - Manual (Page 7)

BLACK SPOTS
These are cosmetic blemishes in the image intensifier or dirt or debris between the image lenses.
BRIGHT SPOTS
These can be defects in the image area produced by the NO/D-930. This condition is caused by a flaw in the
film on the microchannel plate. A bright spot is a small nonuniform, bright area that may flicker or appear
constant. Bright spots usually go away when the light is blocked out and are cosmetic blemishes that are
signal induced.
CAUTION
Condition, practices, or procedures that must be observed to avoid damage to equipment, destruction of
equipment, or a long term health hazard.
CHICKEN WIRE
An irregular pattern of dark thin lines in the field of view either throughout the image area or in parts of the
image area. Under the worst case condition, these lines will form hexagonal or square-wave shaped lines.
DARK (OR DARK AREA)
A place in which there is very little light. It does not mean total darkness. Generally, this means conditions
similar to a quarter-moon or starlit night.
DARK ADAPTED
Having one’s eyes adjusted to the device’s output under low-light conditions.
DIOPTER
A unit of measure used to define eye correction. Adjustments to the eyepiece focus ring will produce a
clearer image in each eye.
EDGE GLOW
This is a defect in the image area of the NO/D-930. Edge glow is a bright area (sometimes sparkling) in the
outer portion of the viewing area.
EMISSION POINT
A steady or fluctuating pinpoint of bright light in the image area and does not go away when all light is
blocked from the objective lens. The position of an emission point within the image area does not move.
An emission point should not be confused with a point light source in the distance.
FIXED-PATTERN NOISE
This is a cosmetic blemish in the image area characterized by a faint hexagonal (honeycomb) pattern
throughout the viewing area that most often occurs at high-light levels or when viewing very bright lights.
Fixed-pattern noise is inherent in the structure of the fiber optics and can be seen in every image intensifier
if the light level is high enough.
FLASHING
This is a defect in the image area of the NO/D-930. The image appears to flicker or flash.
FLICKER
See “Flashing.”
GAIN
This is the number of times a night vision device amplifies light input.
IMAGE INTENSIFIER ASSEMBLY
An electro-optical device that detects and amplifies ambient light to produce a visual image.
GLOSSARY OF TERMS
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