Main tube parameters
Image Intensifier Type | 2+ / SD, |
| 3 / HD |
(Generation/Grade) | HD, XT |
|
|
Photocathode operating diameter, mm | 18 |
|
|
Photocathode type |
| GaAs | |
Photocathode sensitivity, min: |
| ||
Integral, µA/ lm |
| ||
Spectral at λ = 850 nm, mA/W | 35 |
| 45 |
Light amplification | 25,000 |
|
|
Image magnification | 1 |
|
|
Max dark background brightness, cd/m2 | 1⋅10 −3 |
| |
| |||
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 | |||
Spatial
5.4Installation 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
Frequency,
lines/mm
2.5
7.5
15.0
Contrast transfer Coefficient (HD)
0.89
0.68
0.40
Contrast transfer Coefficient (XT)
0.92
0.80
0.58
penetration) and can be damaged easily. Do not force the lens rotation. If it does not screw in smoothly, remove it and
Field of view cleanness
Zone | Zone | Maximum diameter of defects | Admitted | ||
# | Diameter, | Neglected | Admitted | area of defects, | |
| Mm |
|
|
| total, mm2 |
|
| ∅, 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 | 0.15 | 0.35 | 3 | 0.50 |
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.