Night Vision monocular Zenit NV-400
Zenit NV-400 night viewer will give
you a new possibility of the observation and orientation in the twilight and at
night in the natural moon and stellar light; the built-in IR illuminator will
allow you to conduct secret observation in total darkness.
The night viewer can be used by
tourists, hunters, guard services, for various tasks at night time.
General instructions
When purchasing check its
functioning. The checking should be done in darkness in order to get the exact
understanding of its capabilities. If the conditions don’t allow you to do it
you can turn on the viewer at the normal lighting with the lens cap on. The
quality of the image being observed will differ from the real, but this will
show whether if functions normally.
The operational conditions of the
viewer:
-operating
temperature range: -15˚C to +40˚C,
-relative
humidity: up to 85% at +25˚C.
The viewer’s external design may
differ from that on the figure due to its continuous development.
ATTENTION! Do not turn on the unit
with the lens cap removed if the illumination of the observed objects exceeds
the natural night light considerably (more than 1-2 lux): this can worsen the
unit performance.
Due to design peculiarities of the
electrooptical transducer dark spots can be observed in the viewer’s field of
view. They neither influence the image quality nor interfere with night
observation.
Technical data
- Eyepiece
diopter correction……±4 diopters
- Supply
voltage……………….….3.0-0.5V*
- Current
consumption,
* Power supply from two AA alkaline batteries
(size 15x50mm)
The design and principle of operation
The design of the viewer consists of
an objective lens, an eyepiece, a housing with built-in illuminator and a
brightness amplifier, which includes an electro-optical transducer, a converter
and a voltage multiplier.
The eyepiece design provides the diopter
setting according to the observer’s eye.
The viewer’s principle of operation
is based on the thousands times intensification of the luminous radiation from
the observed object with the use of the electro-optical transducer.
The objective lens forms the optical
image on the electro-optical transducer cathode. Due to the radiation the
photoelectron emission occurs; the number of photoelectrons in each point
of the cathode is proportional to its illumination.
The electro-optical transducer
focusing system directs and accelerates the photoelectronic flux for account of
the potential difference between the photocathode and the screen, and forms an
electronic image.
On the luminescent screen the electronic
image is converted into the visual image of the observed terrain, which is
viewed through the eyepiece.
For the additional illumination of
the observed object when the natural light is insufficient and when viewing
in the total darkness the IR illuminator built in the finder is used.
Operation instructions
Handle the viewer with care, keep it
clean, avoid shocks and do not expose it to dust, dampness and wide
fluctuations of temperature.
Do not touch optical parts with
fingers as grease stains may result in optical surface damage.
Keep the viewer in its case with the
lens cap on. When the viewer is not used for a long time (more than a month),
remove the battery from the device and keep it separately.
When the viewer is brought from the
cold environment into a warm room do not take it out of its case at once, keep
it in its case for several hours before turning on.
As the viewer is a complex device it
should be repaired only by skilled specialists or at the manufacturing plant.
Clean the lens and eyepiece optical
surfaces only with soft cloth or cotton wetted rectified spirit or ether.
To check the viewer functioning do
the following:
-remove
the viewer from the case,
-open
the cover disposed on opposite side from the buttons1 and 2; the cover is
hinged;
-set
the batteries according to marking on the viewer housing;
-set
the cover on its place;
-make
sure that the objective lens is covered with a cap, turn the viewer from bright
light and press button1, you will see greenish glow in eyepiece.
Check the illuminator functions by
visual observation; a red spot should appear on the illuminator’s objective
when pressing the button2;
-check
the viewer and place it in its case.
ATTENTION! Do not turn on the viewer
when the housing is open as it has elements with high voltage.
Operation procedure
To prepare the viewer for operation
it is necessary to do the following:
-remove
the viewer from the case;
-insert
the batteries into the viewer as was said before;
-remove
the cap from the objective lens;
-while
viewing through eyepiece press button1; if the light is insufficient turn
on the illuminator by pressing button2;
-focus
the viewer to the observed object so that it is located in the center of the
field of view;
-get
the sharp image of the observed object in the field of view by turning the
objective lens ring and the eyepiece.
To safe the power source the button1
on the viewer can be released from time to time.
NOTE. Remember that continuous work
of the illuminator can unmask the observer as the illuminator window can be
seen by the observed object just like a lighted cigarette. If it creates a
dangerous situation to decrease the unmasking effect and to save the power
source the illuminator can be turned off from time to time by releasing the
button2, and the observation can be conducted without illumination.
The operation being finished put the
cap on the objective lens and place the viewer into its case.