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|  MIL-F- l4252(AR )
3.11.19 Controls. - Operating controls shall be conveniently
located and redily accessible and shall be sufficiently rugged
to withstand repeated operation by unskilled personnel (See 3.2. 14)
Operation.- Play and backlash shall be held to the
3.11.19.1
minimum necessary to prevent poor contact or inaccurate setting.
Controls shall operate freely and smoothly without binding, scrap-
ing, or cutting, and shall be lubricated when lubrication does
rot interfere with operation. Controls shall maintain their
setting when the equipment is subjected to service conditions.
3.11 .19.2 Knobs .- Knobs shall conform to Specification MIL-K-
3926 wherever applicable. Knobs shall have high impact strength
and each shall be firmly secured to Its shaft. Plastic knobs
shall have metal inserts for the screws. Due consideration shall
be given to the shape coding or color coding of knobs where ap-
plicable.
.- Plastic for dials shall be in accordance
3.11.19.3 Dials
with specifcation MIL-P-80 Under normal conditions of eyesight
and lighting, divisions and lettering of dials shall be legible
+ t a distance of two feet, anywhere within an angle of 30 degrees
a.
from a line through the center of the dial and perpendicular to
the panel on' which the dial is mounted. Dials shall be of suffi-
cient thickess to avoid distortion.
Unless otherwise specified,
3.11.19.4
Direction
of'
rOtation.-
rotating controls shall be connected in the circuit that the
controlled characteristics (sensitivity, volume and voltage)
increases with clockwise rotation of the control as viewed from
the operating position..
3.1.1.20 Radio suppression.- Electrical components of fire-con-
trol equivilent shall conform to the requirements of Specification
MIL-S-117E 8 and the interference limits set forth therein, and
where necessary, shall be suppressed in accordance with the re-
quirements of SpecIfication MIL-S-103T90
3.11.20.1 Radio interference rejection.- Fire-control equipment
shall be provided with adequate radio interference rejectlon
measures to prevent random operation or malfunctioning of the
eqivilent.
21 High potenti al.- Unless otherwise specified, insulation
3.11.21
break-down shall not. occur between isolated electrical circuits
and between electrical circuits and ground when tested in accord-
ance with 4.5.12.
resistance.- Unless otherwise specified, the
3.11.22 Insulation
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