Newcon Optik NVS 7 - Manual (Page 4)

Precautions
NVS 7 is a sophisticated precise optical instrument equipped
with electronics.
Therefore, it should be handled with due care.
• Try to avoid strong heat, direct sunlight, impacts, dust, moisture
and sudden changes of temperatures. Keep in mind that, although
being very durable, NVS7 contains fragile components.
• Do not touch the optical surfaces with fingers. Doing so
may damage the anti-reflection coating.
• Cleaning of optical surfaces is allowed only with
professional camera lens cleaning supplies.
• To clean the exterior of the device, use only a soft clean
cloth.
• Do not take the cover off the lens if not necessary.
• Keep away from heating appliances and central heating.
• Make sure to switch off the unit and remove the batteries
during periods of non-operation and when storing the device
for long period of time.
• Do not apply superfluous efforts at work with lens
assembly, agile elements and thread connections.
• Due to considerable optical magnification of the eye-piece
some small structures inside the Image Intensifier Tube
coating in the form of dark and/or white points may be seen
in the field of view. This does not affect the serviceability of
the device.
6. TROUBLESHOOTING
The device does not work.
Check that the battery is installed properly.
Check the charge of the batteries. Replace them if they are weak.
The image does not appear in focus.
Bring the inspected object to the center of the image. Rotate the
eyepieces (6) to achieve the clearest image on the screen. Then
obtain the most clear-cut image of the object focusing the lens
(2). Repeat the steps of focusing if necessary
If the view still does not seem in focus, clean the lenses - they
could be foggy or dusty.
Unit flashes
It is normal for the unit to flash within the first 2 minutes of
activation. If the flashing continues afterwards the following is a
possible cause: bright environment (even with the caps closed!)
Condensation accumulates on the parts.
It is O.K. to use the unit in cold. However, when the unit is
brought from the cold into a warm environment, it has to warm
up for up to 2 hours (not minutes!).
Only then it is allowed to turn it ON again.
Visibility decreases and / or disappears.
Bright light sources (moon, projectors or headlights) may cause
visibility to degrade or even completely disappear. Move the
device away from the light source immediately.
The image should be restored in within 2 minutes. Poor
atmospheric conditions such as fog, haze or extremely dark
environments will decrease the visibility distance of the unit.