Specifications

M!L-STD-1472!i
5.8.2 Illurninance. Where equipment is to be used in enclosures and is not subjcxt to blackout
or special low-level lighting requirements, illumination levels shall h as specified by Table XXI and
shall be distributed so as to reduce glare and specular reflection. (Some unusual inspection tasks may
require up to 10,000 lux (1,000 footcandles).) Capability for dimming shall be provided. Adequate
illumination shtdl be provided for maintenance tasks. General and supplemen~ lighting shall be
used as appropriate to ensure that illumination is compatible with each task situation. Portable lights
should be provided for personnel performing visual tasks in areas where fixed illumination is not
provided, For display lighting, see Table XXII.
5.8.3 Acoustical noise.
5.8.3.1 General. Personnel shall be provided an acoustical environment which will not cause
personnel injwy, mterfem with voice or any other eomrnunications, cause fatigue, or in any other way
degrade system effectiveness. The fact that a component which contributes to the overall noise maybe
government ftmnishedequipment shall not eliminate the requirement that the total system conform to
the criteria herein.
5.8.3.2 Hazardous noise. Equipment shall not generate noise in excess of maximum allowable
levels prescribed by MIL-STD-1474.
5.8.3.3 Non-hazardous noise. Workspace noise shall be redueed to levels that permit ne.ceswuy
direct (person-tqemon) and telephone communication and establish an auxptable acoustical work
environment. Criteria for workspaces are defined by either the A-weighted sound level (dB(A)) or the
speech interference level (SIL) and are given in 5.8.3.3.1 through 5.8.3.3.6.
The A-weighted sound level is the desired requirement
t. Where it is not possible to meet the specified
A-weighted sound level, the conesponding ML requirement shall be met. Figure41 provides
guidance on the relationship between required voeakffort, speaker-to-listener distance and noise level.
Procedures for deterrmnm
“ “ g speeeh inteIiigibii.ity are provided in 5.3.12.
5.8.3.3,1 General workspaces Areas requiring occasional teiephone use or occasional direct
communi@l“onat distances up to 1.5 m (5 ft) shall not exeecd 75 dBA ML, (ExarnpIes: maintenance
shopsand shelters, garages,keypunchareas, shipboardengineeringareas.)
5.8.3.3.2 Operationrd am%s.Areas requiring frequent tekphcme use or occasional direct
communication at distances up to 150cm (5 ft) shall not exceed 65 d13ASIL. (Examples
operation cent.m, mobile command and communication shelters, combat information centers, word
processing centers.)
5.8.3.3.3 Lame workspaces Areas requiring no difficulty with telephone use or requiring
occasional direct communication at distances up to 460 cm (15 ft) shall not exceed 55 dBA SIL.
(Exarnpks: drafting rooms, shop offices, laboratories.)
5.8.3.3.4 Sn@!—mm3sM=d -. A?easfequimg fwdiWia4&yti&=
communication shall not exceed 45 ciBA SIL. (Examples: conference rooms, libraries, of’fks,
command and control centers.)
3.8.3.3. s Mm?memrlet m. Aruas mqtnrmg emtitww)quid dd bid e)uad 35 @A SII-
(Example:recordingstudios.)
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