ATN PS-7 Operator's Manual page 12

C. Principle of Operation
the PS-7 night vision goggles utilize the principle of intensification of
the residual light which is reflected from the surrounding objects.
the device consists of the objective lens assembly, two eyepieces
and the body. the body contains a image intensifier tube assembly
with an integrated high voltage power source and the battery hous-
ing.
objective lens protective cover is intended to protect the objective
lens from dust and scratches. It also will act as a daylight filter, allow-
ing you to test the scope in daylight or other bright light situations.
the pinhole in the center of the protective cover allows the user to
check the operation ability of the device in daylight conditions.
Built-in Ir Illuminator makes it possible to observe the objects when
the goggles work in the conditions of low light or total darkness.
the eyepiece incorporates red leD indicator serves as an Ir Illumi-
nator Indicator and an Battery low Indicator at a time.
D. Automatic Brightness Control System
the device has a built in automatic Brightness Control. even under
unsteady brightness conditions, this system always keeps the image
intensifier tube brightness level constant.
NOTE
Automatic Brightness Control System do not protect a device
from damage by bright light sources (a fire, headlights of the
automobile, lanterns, etc.). Do not point the device at a bright light
source.
E. Automatic Shut-off System
the automatic Shut-off System tracks when the unit is not used (the
controls are not touched for 20 minutes continuous) and shuts the
unit off automatically.
F. IR Illuminator Indicator
Built-in Ir illuminator of PS-7 is on when the red leD indicator in fild
of view of goggles light becomes stable.
G. low Battery Indicator
If the red indicator in the Fov starts flickering, it means there might
be about 20% of battery charge left. It is time to change your battery.
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