 |
|||
|
Page Title:
Interchangeability verification. |
|
||
| ||||||||||
|
|  MIL-M-70542 (AR)
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 spe-
cified 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.
Collimation error shall not exceed 50
3.5.1 Collimation.
seconds.
Maximum allowable parallax shall not exceed 10
3.5.2 Parallax.
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.
The resolution of the system shall
3.5.5. Resolution measurement.
not exceed 8 seconds.
The eyepiece setting shall be
3.5.6. Eyepiece focus measurement.
- 0.75 + 0.25 diopters.
The requirement for magnification is 7X
3.5.7. Magnification.
plus or minus 0.14X.
The FOV shall be 6 degrees minimum.
3.5.8. Field of view, FOV.
3.6 Purging. The MBD shall be purged with dry nitrogen for a
period of time until it is determined that the dew point is at least
-25 degrees F at atmospheric pressure. The unit shall be sealed imme-
diately after purging.
3.7 Sealing. Care will be utilized to keep MBD internal
atmosphere purged. The MBD shall show no evidence of leakage in
excess of 0.1 PSI when subjected to an internal pressure of 5 PSIG
plus or minus 0.1 PSI for a period of one hour. The interior
atmosphere of the accepted MBD shall contain nitrogen having a dew
o
point at least as low as minus 25 F at a pressure of between 0.25 and
0.50 PSIG.
3.8 Interchangeability verification. All MBD's shall be
interchangeable (see 4.7.6.1).
-3-
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals