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OPERATION:
During daytime: It is allowed to turn on the goggles at daytime for a
short period of time, for testing purposes only. Lens cap must be
installed during this operation. The image will be fuzzy, and/or you will
see 3 images. This is normal because of the catadioptric construction of
the lens.
Warning. Never turn on the goggles with either 1x or 4x lens
during daytime, without the lens caps. Doing so will result in
damaged power supply and/or tube and costly repairs not
covered by the warranty.
During night time: Remove the lens cap by unscrewing it counter
clockwise. Keep the lens cap in a safe place, so it won't get lost. Use
the focusing ring at the base of the lens in order to adjust the image.
You will need to readjust the image for different objects at different
distances.. You should expect to have a sharp image for distances as
close as 10-20m through infinity.
Figure 5
NVS 7 with 4x lens
Figure 6
NVS 7 with 8x lens
3. SPECIFICATIONS OF NVS 7
Model NVS 7-2 7-2SD 7-2HD 7-2XT 7-2WA 7-3HD
Image Intensifier Tube
(IIT)
18 mm Gen. 2+ 25 mm
Gen. 2+
18 mm
Gen. 3
IIT model
NC104322 NC064322 NC064322 NCXT4322 NC064331_25 N3064322
IIT resolution, lp/mm
30-36 40-45 45-57 57-72 45-64 45-72
Field of view, º
40 60 40
Eye relief, mm
25 15 25
Objective focal length,
mm
27.5 24.76 27.5
Objective F / T
numbers
F1.2 / T1.25 F1.35 /
T1.4
F1.2 /
T1.25
Magnification, x
1
Interpipillary distance,
mm
58-72
Focus range, m
0.25-∞
Dioptric correction
±5
Battery type
2 standard AA batteries
Battery life, hours
Over 80 hours without I/R; over 30 hours with I/R
Low battery indicator
- √ √ √
I/R ON indicator
- √ √ √
Momentary I/R button
- - √ -
Automatic shut-off in
the up-rise position
(optional)
- √ √ √
Waterproof 2 m, 2
hours
- √ √ √
Dimensions, mm
150x120x55
Weight, kg
0.480
NOTE: As the design is being continuously improved some
descriptions may differ from those given above.