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Main tube parameters
Image Intensifier Type
(Generation/Grade)
2+ / SD,
HD, XT
3 / HD
Photocathode operating diameter, mm 18
Photocathode type S-25 GaAs
Photocathode sensitivity, min:
Integral, µA/ lm
500-750 1200-2100
Spectral at λ = 850 nm, mA/W
35 45
Light amplification 25,000
Image magnification 1
Max dark background brightness, cd/m
2
1⋅10
−3
Signal-to-noise ratio, min 18-25 18-24
Current consumption, max, mA 20 25
Voltage, V
2.8±0.8
Tube life until reduced parameters, hrs 10,000
Keep time, years 15
Ambient temperature range, °C -50 … +55
Spatial frequency-contrast characteristic
Frequency,
lines/mm
Contrast transfer
Coefficient (HD)
Contrast transfer
Coefficient (XT)
2.5 0.89 0.92
7.5 0.68 0.80
15.0 0.40 0.58
Field of view cleanness
Zone Zone Maximum diameter of defects Admitted
# Diameter, Neglected Admitted area of defects,
total, mm
2
Mm
∅, mm
Qty
1 0 – 9.0 0.10 0.15 2 0.15
2 9.0 - 14.4 0.12 0.25 3 0.30
3 14.4 -18.0 0.15 0.35 3 0.50
5.4 Installation and operation of optional lenses
INSTALLATION:
Note: The following procedure is identical for 4x or 8x lenses . Unpack
the 4x lens from the box. Turn off the NVS 7 goggles. Remove the
rubber lens cap (6). Remove (unscrew) the original 1x lens, which is
included with the NVS 7 goggles. To do that, hold the lens at its base
(1) and unscrew it counters clock wise. Once the original 1x lens has
been removed, store it in a safe, clean space (you can use the 4x lens
packaging for that). The
NVS 7 4x lens should be
screwed, clock wise,
instead of the 1x original
lens. Please exercise
extreme caution at the
initial stage.
The threads are very fine
(to prevent humidity
penetration) and can be
damaged easily. Do not
force the lens rotation. If it
does not screw in
smoothly, remove it and
make sure that the threads are matching correctly. Now it is ready for
operation. Removal of the lens is done in reverse order.
Warning: The lens should screw in smoothly. If not, remove it and
make sure that the threads are matching correctly.
Failing to do so and forcing the installation of the lens will
result in broken threads and costly repairs to both the
goggles and the 4x lens.
1. Lens base
Figure 4