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Page Title:
Resolution/eyepiece focus measurements. |
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|  MIL-M-70542 (AR)
4.7.4.4 Transmission.
4.7.4.4.1 Transmission test fixture. The test fixture consists
of a light source and intergrating sphere, mount and calibrated
telephotometer.
4.7.4.4.2 Transmission measurement. The telephotometer is set to
view the light emitted from the light source and normalized. Light
from the light source is back lighted through the eyepiece of the MBD.
When the MBD is placed in the light path it shall be positioned so that
light exit of the light source is at the focal point of the MBD's
eyepiece. The telephotometer is moved to view the objective of the
MBD and the transmission is measured. Transmission shall be 60 percent
minimum when utilizing a photopic filter.
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
discernable 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
dinameter. 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.
-10-
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