Manual ATN PS28 (page 41 of 48) (English)

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(4) Fixed-Pattern Noise. This is usually a cosmetic blemish char-

acterized by a faint hexagonal (honeycomb) pattern throughout

the viewing area that most often occurs at high light levels or

when viewing very bright lights (see Figure 3-4). This pattern can

be seen in every image intensifier if the light level is high enough.

This condition is acceptable as long as the pattern does not

interfere with the operator’s ability to view the image or to

perform the mission.

FIGURE 3.4. FIXED-PATTERN NOISE

(5) Chicken Wire. An irregular pattern of dark thin lines in the field-

of-view either throughout the image or in parts of the image area

(see Figure 3-5). Under the worst case condition, these lines will

form hexagonal or square-wave shaped lines. No action is re-

quired if this condition is present unless it interferes with

the operator’s ability to view the image or to perform the mis-

sion.

FIGURE 3.5. CHICKEN WIRE

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ATN PS28 Manual

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