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|  MIL-C-48550(AR)
3.4.3.4 Cleanliness. - The optical system shall meet the cleanliness
requirements of Specification MIL-O-13830 and there shall be no more
than 3 particles of dirt visible on the reticle and the area of such
particle shall not be in excess of the. area equivalent to a size
10 dig. There shall be no dirt within the optical system which
interfers with observation or adversely affects image quality.
3.4.3.5 Reticle illumination. - All reticle graduations and numbers
shall be clearly defined when observed through a four power telescope
in ambient darkness at distances from 15 to 48 feet inclusive.
3.4.3.5 Reticle illumination. - Brightness of the collimated light
output measured in complete darkness at approximately one quarter
inch from end of collimator shall be a minimum of 275 microlamberts.
NOTE:
This requirement allows for transmission losses in the
fully assembled collimator and for degradation related
to the combined effects of workmanship and aging due to
the elapsed time associated with the collimator assembly
process. It provides approximately 9 months from the time
of a fully assembled and tested unit.
3.4.4 Mechanical.
3.4.4.1 Elevation travel. - The elevation travel of the line of
sight shall coverthe minimum excursion from minus 800 mils when
the tripod legs are fully extended.
3.4.4.2 Azimuth travel. - The instrument shall provide a full and
unrestricted 6400 rolls azimuth rotation.
3.4.4.3 Open sight. - The line of sight of the open sight shall be
parallel to the optical axis within one degree.
3.4.4.4 Operability. - There shall be no looseness as assembly,
shake. restriction or binding of any part of the equipment when the
collimator is placed from the carrying position to operational
position. The hinge of the tripod legs shall have sufficient torque
to support the fully extended legs in a horizontal position.
3.4.4.5 Knob travel. - Each knob shall provide full locking to free
movement of the instrument component.
3.4.4.6 Knob locks. - The locks shall be operable when exposed to
the requirements of 3.4.1.2 and shall meet the requirements of Table 1
when exposed to temperatures of +60F to 90F. The part shall not
move when the test value is applied.
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