Specifications

MIL-STD-1472E
5.4.2.1.3.5 ~.
5~4.2.L3.5.l ~,
Where ambient illumination will provide display
brightnessbelow3.5 uVrnz(1 ft-L), the thumbwheelcharactersshall be internally Wrninated,
appearagainsta blackback
r
und,and have dimensionsapproximatingthe follow@ Might=
4.8
mm (3/16w),height-to-Wid Rado = 3:2 and height-to-Stroke
WidthRatio= 101.
5.4.2.1S.5.2 ~
Where ambient illumination wiIl provide a display
luminance above 3.5 cdlmz (1 ft-L), internal illumination is not required. Digits should be bold,
black numerals
engravedon a light (or white) thumbwheelbac
T’
und, with dimtmsionsas specifkd
in 5.42.1.3.5.1,exceptthat the height-to-strokewidthratio sho d be approximately5:1
5.4.2.1.3.6-. Thumbwhed designshall permitviewingof hdine digital read-out fiwm
all operatorpositions.
5.4.2.1.3.7 ~ Controldimensionsshallconformto the criteria in Figure 6.
— w—
t
tpl
9
9
7
--w-
D w
H
s
TROLWH
DIAMETER
DISTANCE
WIDTH DEPTH
SEPARATION
RESISTANCE
MINIMUM
20 mm
11 mm
Smm 3 mm
10 mm
1.7 N
{1.1/9 in.)
MAXIMUM
W16 id
(1MId tlnlIILI
(W32 in.)
(6 02)
mmm
19mm
13mm
6.8 N
0 h}
W4 Id
mid
120u}
L
FIGURE6. Discrete thumbwheel control
Detentsshall be providedfor discreteposition thumbwheek
ild up and then decreaseas each detentis approachedso Utatthe
controlsnaps into position withoutstoppingbetweenadjacentdetents, The resistance shall be within
thelimits indicatedin Figure 6,
5.zI.2.t.3.9 ~. ?%eqmeatkm bewvewi-*~&&wiwd
GWUWISw
conform to the criteria in Figure 6
andshall besufficientto precludeaccidentalactuation of adjacent
controlsduringnormal wining.