 |
|||
|
|
|||
| ||||||||||
|
|  MIL-M-70542 (AR)
3.9 Workmanship.
3.9.1 Optical inspection. The MBD shall be viewed with the
unaided eye from the objective end against a background of approx-
imately 300 foot candles. There shall be no cracks, chips or bond
separation. When a focused target is viewed through the eyepiece
end, there shall be no scratches, chips, dirt or coating deterioration
which would be a distraction to the observer,
3.9.2 Mechanical inspection. The mechanical parts of the unit
shall be inspected for broken parts, completeness, workmanship and
functionability. The locating block shall be checked for freedom and
smoothness of operation. Paint chips or nicks which do not affect the
function of the instrument shall be touched up. All burrs and excess
material shall be removed from castings and forgings. All surfaces,
including threads, shall be free from burrs and sharp edges.
Environmental.
3.10
Storage temperature. The MBD shall show no evidence of
3.10.1
cement separation, glass breakage or other physical failure and shall
meet all the requirements of this specification at standard tem-
perature (Plus 15 degrees C to 32 degrees C) after having been exposed
and thermally stabilized at temperatures of plus 71 degrees C and
minus 62 degrees C.
Operating temperatures. The MBD shall be mechanically
3.10.2
operable while thermally stabilized at plus 65 degrees C and minus 40
degrees C. The rate of temperature change shall not exceed 10 degrees
C/hour.
Vibration. The cased MBD shall be capable of withstanding
3.10.3
vibration when subjected to Test Method 514.2 Procedure X, Curve AV,
Equipment Category G of MIL-STD-81O.
Shock. The MBD shall withstand shock in accordance with
3.10.4
Test Method 516.2, Procedure I, Figure 516.2-2, time duration 11
milliseconds of MIL-STD-810. except that the peak acceleration shall
be 40 g's.
Humidity. The MBD shall operate as specified herein at up
3.10.5
to 100 percent relative humidity. (see 4.7.10.7)
3.10.6 Dust. The MBD shall operate as specified herein after
exposure to moving dust for not less than 12 hours at velocities up to
1750 feet per minute. (see 4.7.10.8)
Salt fog. The MBD shall operate as specified herein after
3.10.7
exposure to a 5 percent sodium chloride atmoized spray for not less
than 48 hours. (see 4.7.10.9)
-4-
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals