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|  MIL-M-48640 (AR)
4.7.4 Methods of inspection.
4.7.4.1 Collimation test method. Collimation error shall be
measured by viewing through the eyepiece of the MBD and comparing
the coincidence of the reticle boresight referenced to the projected
reticle image of the Collimation/Parallax test fixture. The
accuracy is determined by comparing the MBD reticle reference point
to the projected reticle pattern. Collimation is met when
collimation error is within 50 seconds.
4.7.4.2 Parallax test method. Parallax shall be measured by
viewing through the eyepiece of the MBD and observing the apparent
displacement between the MBD reticle and the projected reticle image
of the Collimation/Parallax test fixture as the observer moves his
eye from side to side or up and down. The accuracy is determined by
comparing the displacement to the reticle pattern marking. Maximum
allowable parallax error is 10 seconds.
4.7.4.3
Repeatability/collimation.
4.7.4.3.1 Repeatability/collimation test fixture. The
collimation/parallax test fixture or gun tube is to be used for the
image repeatability test.
4.7.4.3.2 Repeatability/collimation measrement. The
collimation error is noted with the MBD inserted in the Collimation/
Parallax Test Fixture. Unit will be withdrawn then reinserted into
gun tube or test fixture. The collimation error is noted and
comapred to the initial reading. Repeatability within 30 seconds is
acceptable. Both measurements must meet the collimation requirement
of 3.5.1.
4.7.4.4
Transmission.
4.7.4.4.1 Transmission test fixture. The test fixture consists
of a light source and integrating 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.
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