Spatial Frequency-Contrast Characteristic; Main Parameters; Field Of View Cleanness - Newcon Optik NVS7-2/4x Operation Manual

IMAGE INTENSIFIER TUBE SPECIFICATIONS
The unit is utilizing a small size image intensifier with direct image transfer.
The tube contains a microchannel plate, multi-alkaline metal cathode, yellow-green color
screen, built in electronics high voltage DC to DC converter and flat surface glass
input-output windows.

Main parameters:

Image Intensifier Type (Generation)
Photocathode operating diameter, mm
Photocathode type
Resolution, lines/mm
Photocathode sensitivity, min:
Integral, µA/ lm
Spectral at λ = 850 nm, mA/W
Light amplification
Image magnification
2
Dark background brightness, max, cd/m
Signal-to-noise ratio, min
Current consumption, max, mA
Voltage, V
Weight, g
Dimensions
Length, mm
Diameter, mm
Tube life until reduced parameters, hrs
Keep time, years
Ambient temperature range, °C
2+ 3
18
S-25 A B (GaAs)
3 5
30-64 45-64
400-650 1300-2200
15 90
20-26000 25-30000
1
−3 −3
1⋅10 3⋅10
16-20 16-24
20 25
2.8 ± 0.8
55
22.5
43.0
10,000 10,000
12 15
± 40 ± 50

Spatial frequency-contrast characteristic

Frequency, lines/mm Contrast transfer
Coefficient (Gen. 2+)
2.5 0.83
7.5 0.56
15.0 0.26

Field of view cleanness

Zone Zone Maximum diameter of defects
# Diameter, Neglected
Gen. 2+ Mm
1 0 – 9.0 0.10
2 9.0 - 14.4 0.12
3 14.4 -18.0 0.15
Gen. 3
1 0 – 8.75 0.06
2 8.75 – 14.0 0.08
3 14.0 – 18 0.10
4. CONSTRUCTION
1. On-Off, I/R Switch
2. Mounting Socket
3. Eye-piece adjustments
4. Eyepieces
5. Battery House Cover
Objective Lens focus
6.
Contrast transfer
Coefficient (Gen. 3)
0.86
0.58
0.28
Admitted total
Admitted area of defects,
∅, mm Q-ty mm 2
0.15 2 0.15
0.25 3 0.30
0.35 3 0.50
0.15 1 0.072
0.25 2 0.27
0.35 3 0.45
2 3
5
4
1
6
Figure 1