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NVS 6
MANUAL
Page 10
For balancing out the overturning momentum produced by the unit
in the operating position, use is made of counterweight (9) secured on the
rear portion of the helmet.
The helmet should be tailored for employment of the night-vision
goggles. For this purpose, the standard casing should be replaced and
the strip of the sticking fastener should be bonded to the helmet rear
surface for attachment of the counterweight (the necessary appliances
are included in the set of spare parts).
Note: other helmets may require different mounting mechanisms
5.3.5 Caps (12) are intended to safeguard the image intensifier
tubes against exposure to light and protect the optical components of
the lenses from mechanical damage.
The caps are provided with holes for checking the night-vision
goggles for serviceability at an illumination intensity of more than 1 lx (in
conditions of day light and dusk), as well as with retainers (two spring-
loaded projections located on the cap sides) used for reliable locking of
the cap in the mount of lens (1).
Small projections in the sides of the cap are provided, with holes for
joining the caps, in pairs by means of a fishing line. This will minimize
their inadvertent loss in service.
5.3.6 The moisture-resistance of the unit is ensured with the use of
annular rubber seals and dehydrator cartridges (13). These are intended
to absorb moisture in case it gets into the interior space of the monocular
pair. The dehydrator cartridge is filled with silica gel that is bluish in color
when it is not saturated. As the silica gel gets saturated, it turns rose-pale
or off-white. The external condition of the silica gel is monitored through
sight glass (14).
5.4 The NVS 6 standard set comprises the night-vision goggles, the
voltage converter and the single set of spare parts. (Optional)