Specifications

MLL-STD-1472E
5.11.2 Trackin~
5.11.2.1 Gunner environment. Where applicable, obscuration, shock and vibration should be
sufficient y minimized to permit resumption of tracking rapidly after fwing.
5.11 .2.2 Crank size ands
Ed. The size of tracking cranks, where used, shall be a function of
rotation sped required: Within the parameters of Figure 10, crank speed should be 140-200 rpm
and radius should be 55-115 mm (2.2 -4.5 in). Smaller crank radii should be used for high rpm
requirements and the converse.
5. I
1.2.3 Two-dimensional tracking.
A single control (rather than separate controls for each
dimension) should be used for two-dimensional tracking.
5.11 .2.4 SuPports. Where a joy stick is used for tracking, a hand, wrist, or forearm support (as
appropriate) should be provided.
5.11 .2.5 Compatibility. Movement of the tracking control shall be compatible with expected m
conventional control movements.
5.11.3 Optical instruments and related emipment.
5.11 .3.1
General This section pertains only to direct-view, visual optical systems.
5.11 .3.2 Visual accommodation. Any adjustment of
the eyes beyondnormal functional ability
shall not lx required.
5.11 .3.3 Viewing angle. Optical instruments shall be oriented so that they are presented to the
operator at a comfortable viewing angle.
5.11 .3.4 Magnification.
5.11 .3.4.1 Gene@. Instnumnt magnification shall be stilciently high to pemit performance
of the required application (e.g., detection,
recognition, identifkation, weapon laying).
5.11 .3.4.2 Unstabilized unsurmo
rted handheld sights. Because of hand tremors and body
motion,
magnificationof unstabilized,unsupported,handheldrifle and pistol sights shouldbe not
more than 4 power; magnification of unstabilized, unsupported, handheld monocular or binoculars
should be not more than 8 power.
5.11 .3.4.3
MultiPle magnifkxdon reuuirements. If more than one magnification is required,
two or more discrete magnifications should be provided for optimum image quality and botesight
integrity.
Varifocal(zoom) systemsshould be considered for use only in systemswhere sighting
accuracy is relatively unimportant and it results h overall simplification.
5.11 .3.6 Entrance pupil. The entrance pupil shall be eqwd to the product of the magnification
—
and the exit pupil diameter and, therwfore, defined by these parameters.
5,11 .3.7 Exit pupil.
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I t T 7 I General.
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