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|  MIL-M-48640(AR)
3.2 General specification. The provisions of MIL-F-13926 apply.
3. 2.1 Ambient conditions. Standard ambient conditions shall be
as follows:
0
7 3 + 18F
a.
Temperature
50 pecent + 30 percent
b.
Relative humidity
28.5 + 2.0 - 3.0 in Hg.
c.
Atmosphere pressure
3.3 First article inspection. This specification contains
technical provisions for first article inspection. Requirements for
the submission of first article samples by the contractor shall be
as specified in the contract.
3.4
Cleanliness.
a. Defects. There shall be no evidence of moisture, grease,
condensates, fractures, and adhesive separations on any glass
component when viewing either through the eyepiece or objective end.
b. Dirt. When viewing through the eyepiece, there shall be no
more than three (3) particles of dirt or foreign material (classed
as dirt) appearing within a 50 Mil diameter central field of view.
There shall be no more than three dirt particles appearing outside
the specified field of view. The angular separation between dirt
particles shall be at least 15 Mils. Dirt particles smaller than
1/4 reticle dot width shall be ignored regardless of distribution.
The size of any particle shall not exceed the apparent width of the
reticle dot.
3.5
Performance.
3.5.1 Collimation. Collimation error shall not exceed 50
seconds.
3.5.2 Parallax. Maximum allowable parallax shall not exceed 10
seconds.
3.5.3 Collimation repeatability. The collimation repeatability
error shall not exceed 30 seconds. All measurements must meet the
collimation requirements of 3.5.1.
3.5.4 Transmission measurement. Transmission shall be 60
percent minimum when measured using a photopic filter.
3.5.5 Resolution measurement. The resolution of the system
shall not exceed 8 seconds.
3
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