DEAR CUSTOMER,

The Zenit NV small-size 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, and an built-in IR illuminator will allow you to conduct secret observation in total darkness.
The use of a built-in piezoelectric transducer as a power source is a peculiarity of this night viewer, that allows its operation without ordinary galvanic batteries.
Two versions of the viewer are avail able:
- Zenit NV-piezo
- Zenit NV-320 piezo,
which differ by some design features.
The night viewer can be used by tourists, hunters, guard services, for various tasks at night time.

1. GENERAL INSTRUCTIONS

When purchasing the viewer ask the seller to check its functioning. The checking should be done in the darkness in order to get the exact understanding of its capabilities. If the conditions of the shop does not allow 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 it functions normally.
Make sure that the viewer's number and its kit corresponds to the information in the certificate.
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 night viewer with the objective 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 intensifier tube dark spots can be observed in the viewer's field of view. They neither influence the image quality nor interfere with night observation.

2. TECHNICAL DATA

*one battery of DL 1/3 N type (Duracell), size 011.6x10.8 mm

3. THE DESIGN AND PRINCIPLE OF OPERATION

The night viewer consists of an objective lens, an eyepiece, two housings, and a light amplifier which includes an image intensifier and a piezoelectric transducer that feeds power.
The principle of power supply from the piezoelectric transducer is based on the direct piezoelectric effect which results in charging the image intensifier to the service voltage when acting on piezoelectric ceramic elements by the pression and release of lever 3.
The viewer's principle of operation is based on the thousands times intensification of the radiation luminous from the observed object with the use of the image intensifier.
The objective lens 2 forms the optical image on the image intensifier 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 image intensifier 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 6.
The eyepiece design 6 provides the diopter setting according to the observer's eye by turning the eyecup 7.
The observation is possible only after you press against the stop and release lever 3.

4. 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 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 with rectified spirit or ether.
To test the night viewer functioning do the following:
- remove the viewer from the case,
- make sure that the objective lens 2 is covered with cap 1, turn the viewer from bright light;
- press against the stop and release lever 3, you will see greenish glow in eyepiece 6;
- after completing the test, place the viewer into its case.
ATTENTION! Do not press lever 3 when the viewer's housing is open as the image intensifier will have elements witn high voltage.

5. OPERATION PROCEDURE

To prepare the viewer for operation it is necessary to do the following:
- remove the viewer from the case;
- remove the cap 1 from the objective lens 2;
- while viewing through eyepiece 4 press as far as will go and release lever 3;
- focus the viewer on the observed object so that it is located in the center of the field of view;
- get the sharp image of the observed object by turning eyecup 7 on eyepiece 6 (diopter adjustment acceding to the observer's eye);
- when decreasing the image glow press again as far as will go and release lever 3.
One pression and release of the lever allows to observe the object for a time no less than 1 minute.
The observation is over, put the cap on the objective lens and place the viewer into its case.

6. OBSERVATION WITH THE ILLUMINATOR

Infrared illuminator 5 is used for additional illumination of the object to be observed at deficient natural night light as well as when observing in total darkness.
Before mounting the illuminator on the night viewer, a battery should be installed into the illuminator.
To mount the illuminator, slide it onto the slot on the night viewer housing and secure with a captive screw 4.
While viewing through eyepiece press as far as will go and release the lever 3. Turn on the illuminator by rotating the knob in the direction of the arrow ON as far as it will go.

NOTE. Remember that continuous work of the illuminator can unmask the observer as the illuminator can be seen from the observed location just like a lighted cigaret. To decrease the unmasking effect and to save the power source the illumunator can be turned off from time to time by rotating the knob in the opposite direction as far as it will go.