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|  MIL-M-48640 (AR)
4.7.4.5 Resolution/eyepiece focus measurements.
4.7.4.5.1 Resolution/eyepiece focus test equipment. A four (4)
quadrant eight (8) second pattern on the collimator reticle must be
discernible when viewed through the eyepiece of the MBD with the aid
of a dioptometer.
4.7.4.5.2 Resolution/eyepiece focus measurement. A dioptometer
setting of -0.75 plus or minus 0.25 diopters must register when best
focus of the reticle is obtained when viewed through the eyepiece
with the aid of a dioptometer.
4.7.4.6 Magnification. The magnification is measured by
dividing the objective clear aperture, or entrance pupil, by the
diameter of the exit pupil. The exit pupil diameter is measured
with a calibrated dynameter. The requirement for magnification is
7X plus or minus 0.14X.
4.7.4.7 Field of view (FOV). The FOV is measured by observing
the minimum separation, S, on a target at a distance, D, from the
MBD. FOV = 2 arc tan (S/2D).
4.7.5
Mechanical.
4.7.5.1
Optical/mechanical
workmanship.
4.7.5.2 Optical/inspection. The MBD shall be viewed with the
naked eye from the objective end against a background of
approximately 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. The
presence of an anti-reflective coating, where required, shall be
verified during in-process inspection.
4.7.5.3 Mechanical inspection. The mechaniscal parts of the MBD
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
effect 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.
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