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|  MIL-T-50384(MU)
3.5 Vibration. - The telescope shall be vibrated in a vertical plane
at a constant frequency of thirty cycles per second with an amplitude of
1/16 inch (1/8 inch total excursion) for a period of five minutes plus
or minus fifteen seconds. Subsequent to vibration, there shall be no
evidence of physical failure.
3.6 Cleanliness. - The telescope shall meet the cleanliness require-
ments of MIL-O-13830 and there shall be no more than 2 particles of dirt
visible on the reticle. The area of each particle shall not be in excess
of the areas equivalent to a size 10 dig. There shall be no dirt on other
surfaces which interferes with observation or adversely affects image
quality.
3.7 Sealing. - The telescope shall show no evidence of
leakage when
subjected to an internal pressure of dry nitrogen at 5 psig
for five
minutes. The interior atmosphere of the accepted telescope
shall contain
nitrogen (dew point of nitrogen shall be at least as low as
-25F) at a
pressure of between 0.1 and 0.25 psig.
3.8 Accuracy.
3.8.1 Orientation. - With the telescope mounted on the front mounting
surface and the rear angular locating surface of the objective tube housing,
the plane of the objective tube and the locating key shall be horizontal.
3.8.2 Collimation.
3.8.2.1 Reticle lens. - The extreme left and right zero graduations
shall coincide with a horizontal target line 20 mils above the geometric
axis of the objective tube within 0.5 mil. The vertical line of the
HExM482 ballistic data on the reticle lens shall be 36.5 mils 3 mils in
azimuth from the boresight cross of the sliding reticle at the zero
elevation position.
3.8.2.2 Sliding reticle. - With the telescope positioned as in 3.8.1
and the horizontal line of the boresight cross in coincidence with the zero
graduation on the extremeright,the horizontal line shall be in coincidence
with the zero graduation on the extreme left within 0.2 mil; the line of
sight through the boresight cross shall be parallel in azimuth to the
geometric axis of the objective tube within 0.5 mil.
3.8.3 Eyepiece focus. - The eyepiece focus shall be adjustable over
the range of plus and minus four diopters as read on the diopter scale.
The zero of the diopter scale shall indicate zero diopters within 0.25
diopter.
3.8.4 Reticle accuracy. - The angular values, between the zero and
maximum scale graduations for each of the three scales on the reticle
lens shall be as indicated on the applicable drawings within 3.0 percent.
3
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