Armasight NAM601500126DH1 PVS14/6015 GEN 2+ HD Multi-Purpose Night Vision Monocular - Manual (Page 11)

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1.5 GLOSSARY
BLACK SPOTS. Cosmetic blemishes in the image intensifier of the MUNVM, or dirt or debris between
the lenses.
BRIGHT SPOTS. Defects that can appear in the image area of the MUNVM. This condition is caused by
a flaw in the film on the microchannel plate. A bright spot is a small, non-uniform, bright area that may
flicker or appear constant. Bright spots are cosmetic blemishes that are signal-induced, and usually
disappear when all light is blocked out.
BROWPADS. Three hook-and-pile browpads are provided to adjust the headmount to fit different
head sizes. The thin browpad (for larger heads) comes attached to the headmount and the thick, or
medium (for smaller heads) browpads are stored in the carrying case.
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. In the worst cases of Chicken Wire, 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. When the user’s eyes have adjusted to the monocular’s output under low light con-
ditions.
DIOPTER. A unit of measure used to define eye correction. Adjustments to the diopter adjustment will
provide a clearer image for each eye.
EDGE GLOW. A defect in the image area of the monocular. Edge glow is a bright area (sometimes spar-
kling) 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 of the monocular. The position of an emission
point within the image area of the monocular does not move. An emission point should not be con-
fused with a point light source in the distance.
FIXED-PATTERN NOISE. A cosmetic blemish in the image area characterized by a faint, hexagonal
(honeycomb) pattern throughout the viewing area. It most often occurs in excessive light conditions 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 level of light is high enough.
FLASHING. A defect in the image area of the monocular. The image appears to flicker or flash.
FLICKERING. See “flashing.”
GAIN. The number of times a night vision device amplifies light input.
IMAGE INTENSIFIER. An electro-optical device that detects and amplifies ambient light to produce a
visual image.
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.
INTERMITTENT OPERATION. A defect in the image area of the monocular. See “flashing.”
IR SOURCE. IR Light Emitting Diode (LED). When turned on, the IR source provides additional illumina-
tion to enhance existing light conditions, and should be used only for performing nearby tasks.
MICROCHANNEL PLATE. A current-multiplying optical disk that intensifies the electron image pro-
duced by the photocathode.
PHOTOCATHODE. The input optic of an image intensifier that absorbs light energy and releases elec-
trical energy in the form of an electron image.
SCINTILLATION. A faint, random, sparkling effect throughout the image area. Scintillation is a normal
characteristic of the image intensifier 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.