Specifications

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MIL-STD- 1472E
5.2 Visual displays.
5.2.1 GeneraL Visual displays should be used to provide the operator with a ckar inckation of
equipment or system conditions fm opemtion under any eventuality eolnm~te with the operational
and maintenance philosophy of the system under design.
5.2.1.1 [e-mail]. An akrtinghming display shall provide the opemtor with a greater
probability of detecting the triggering condition than normal observation would provide in the absence
of the display.
5.2.1.2 DisdaY illumination and light distribution
5.2.1 .2.1 Display illumination.
5.2.1.2. i. 1 Normal. When maximum dark adaptation is not requid low brightness white
light (preferably integral and adjustable as appropriate) shall be used; however, when maximum dark
adaptation is required, low 1
urninance [0.07 -0.35 cd/m2 (0.02 -0.10 fL)] red light (greater than 620
nm) shall be provided.
5.2.1 .2.1.2 Nitit vision device cotma
tibiiity.
Where night visi(m device compatibility is
required, display ihmination edor other than red may be usd. The lighting shall be continuously
variable to the fuII OFF position. In the OFF positio~ no cunent shall flow through the lamps.
5.2.1 .2.1.3 Field usepanel dimming.
WhexIcontrol
or annunciator panels wiil be viewed out of
doom~ti~mm ~l~m~h~ti-aag~mml isatits
extreme ckdcwiae rotation. Maximum ilhmi.nation is that mquimd by Tabks ~ and XXI, as
applicable. No panel U@ting cumentshall flow when the dimming ezmtrolis at its extreme counter-
clockwise rotation. Panel I@ levels shall be ecmtinuousty variable fbm 0.1 @ (0.03 fL) near
OFF {o3.5 cd/rn2 (1 fL) at 50?? of clockwise rotation.
5.2.1.2.2 ~hzht di5txibUtiOQ.
Where multiple displays are group together, lighting shall be
balanced across the’
I such that the mean indicator lummmees
~F
of any two instruments
shall not diffkr ~ mom than ~ V.across the range of fidl ON to full OFF. To ensure that light
distribution Withinan integrally ilhminatd instmnm
t is sufficiently unifii the ratio of the standad
deviation of indbtor ekmcnt lumbnces
to mean indicator lumimmce
shall be not more than 0.25,
using eight or more equally speed test measmments.
5.2.1 .2.3 batzaaL Sufkient cxmkast shallbe provided between all displayed information and
the display background to ensure that the required information can be perceived by the operator under
all e~cted lighti~ conditions.
5.2.1.3 hfbmMtiOIL
5,2.1.3. ] ~Qntent Info~atj~n di ]ayed to ~ ~~~t~r shall & sufficient to allow the operator
%2
10perfm-mthe intended mission. but shall
limited to information necessary to ~rform specific
actions or to make decisions.
< 7 I ~ ? pwciqi(~n info~ntion shtil! he (ii~plaved onlv within the limits and precision
rqulrcd for specific operator actions or decisions.
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