HUMAN ENGINEERING DESIGN DATA DIGEST · This digest provides basic, quantitative human engineering...
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HUMAN ENGINEERING DESIGN DATA DIGEST
HUMAN FACTORS STANDARDIZATION SUBTAG
DEPARTMENT OF DEFENSE HUMAN FACTORS ENGINEERING TECHNICAL ADVISORY GROUP
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1. REPORT DATE APR 2000
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4. TITLE AND SUBTITLE Human Engineering Design Data Digest
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HUMAN ENGINEERING DESIGN DATA DIGEST
APRIL 2000
HUMAN FACTORS STANDARDIZATION SUBTAG
DEPARTMENT OF DEFENSE HUMAN FACTORS ENGINEERING TECHNICAL ADVISORY GROUP
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FOREWORD This digest was prepared by the Human Factors Standardization SubTAG of the Department of Defense Human Factors Engineering Technical Advisory Group (DoD HFE TAG). This booklet is a digest of material appearing in MIL-STD-1472, and is complemented with material from MIL-HDBK-759 and the Federal Aviation Administration (FAA) Human Factors Design Guide. The user is therefore referred to those documents and its references for required supplementary information. This digest provides basic, quantitative human engineering design data in pictorial, tabular, and graphical formats for use during system, equipment, or facility design and assessment. Its purpose is to furnish a convenient “portable” reference of human engineering design criteria and guidelines. The principles, explanations, limitations, and application techniques associated with the data have been intentionally omitted. This abbreviated presentation presupposes that the user is familiar with the bases and limitations of the given data or will consult applicable references to ensure appropriate application of the data. Comments from users of this digest are welcomed and should be submitted to:
Mr. Alan Poston Federal Aviation Administration AND-202, Room 300W 800 Independence Avenue, S.W. Washington, DC 20591
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TABLE OF CONTENTS CONTROL/DISPLAY INTEGRATION Inch-pound equivalents, abbreviations, and prefixes.......................................................................................1 VISUAL DISPLAYS Lines of sight ...................................................................................................................................................2 Vertical and horizontal visual field..................................................................................................................3 Coding of simple indicator lights ....................................................................................................................4 Application of various types of mechanical displays.......................................................................................5 Scale of markings ............................................................................................................................................6 Scale marker dimensions .................................................................................................................................7 Relative position of scale marks, numerals, and pointers on circular dials .....................................................8 Group viewing of optical projection displays..................................................................................................9 Color coding of transilluminated displays .....................................................................................................10 AUDIO DISPLAYS Functional evaluation of audio signals ..........................................................................................................11 Intelligibility criteria for voice communication signals.................................................................................12 CONTROLS Control selection criteria ...............................................................................................................................13 Recommended manual controls.....................................................................................................................14 Advantages and disadvantages of various types of control coding................................................................15 Advantages and disadvantages of common controls .....................................................................................16 Minimum edge-to-edge separation distances for controls .............................................................................18 Ball controls...................................................................................................................................................19 Cranks............................................................................................................................................................20 Foot-operated switches ..................................................................................................................................21 Foot-operated controls...................................................................................................................................22 Handwheels ...................................................................................................................................................24 High-torque J-handles....................................................................................................................................26 Joysticks, isotonic..........................................................................................................................................27 Keyboards......................................................................................................................................................28 Nominal keyboard characteristics..................................................................................................................29 Key-operated switch ......................................................................................................................................30 Knobs.............................................................................................................................................................31 Knob detent placement ..................................................................................................................................32 Knobs, ganged ...............................................................................................................................................33 Legend switch................................................................................................................................................34 Levers ............................................................................................................................................................35 Lever controls ................................................................................................................................................36 Mouse ............................................................................................................................................................41 Pedals.............................................................................................................................................................42 Leg strength at various knee and thigh angles ...............................................................................................43
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Representative push button applications........................................................................................................44 Push buttons...................................................................................................................................................45 Push button switches .....................................................................................................................................46 Push-pull controls ..........................................................................................................................................49 Rocker switches.............................................................................................................................................50 Rotary selector switch ...................................................................................................................................51 Rotary selector controls .................................................................................................................................52 Slide switches ................................................................................................................................................55 Thumbwheel, continuous adjustment ............................................................................................................56 Thumbwheel, discrete....................................................................................................................................57 Toggle switches .............................................................................................................................................58 Toggle switch controls...................................................................................................................................59 Touch screens ................................................................................................................................................63 Two-axis controllers for display applications................................................................................................64 Grip switches .................................................................................................................................................65 Arm, hand, and thumb-finger strength (5th percentile male)..........................................................................67 MARKING AND LABELING Character height versus luminance ................................................................................................................69 Luminance contrast ratios for various conditions..........................................................................................70 Stroke width for pixel-generated characters ..................................................................................................71 Height-width relationship for pixel-generated characters..............................................................................71 ANTHROPOMETRY AND BIOMECHANICS Static human physical characteristics - head .................................................................................................72 Static human physical characteristics - seated ...............................................................................................76 Static human physical characteristics - standing ...........................................................................................80 Static human physical characteristics - hands................................................................................................83 Static human physical characteristics - standing position..............................................................................84 Additive effects of clothing on anthropometric measures .............................................................................85 Joint movement ranges ..................................................................................................................................87 Muscle strength of the arm, hand, and thumb (5th percentile male)..............................................................90 Static muscle strength data for vertical pull exertions ...................................................................................92 Horizontal push and pull forces that can be exerted ......................................................................................95 Examples of push force conditions................................................................................................................96 Anthropometric data for common working positions ....................................................................................97 WORKSPACE DESIGN Standard console dimensions.......................................................................................................................102 Standard console dimensions key................................................................................................................103 Seated workspace dimensions .....................................................................................................................104 Seated workspace dimensions key...............................................................................................................105 Standing workspace dimensions..................................................................................................................106 Standing workspace dimensions key ...........................................................................................................107 Mobile workspace dimensions ....................................................................................................................108 Mobile workspace dimensions key..............................................................................................................109 Recommended placement areas for controls and displays...........................................................................110 Seated optimum manual control space ........................................................................................................111 Type of structure in relation to angle of ascent............................................................................................112
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Ramp dimensions ........................................................................................................................................113 Stair dimensions ..........................................................................................................................................114 Stair-ladder dimensions ...............................................................................................................................115 Fixed-ladder dimensions..............................................................................................................................116 Portable rung-ladder dimensions .................................................................................................................117 Rung-ladder and ladder-cage dimensions....................................................................................................118 Stepladder dimensions.................................................................................................................................119 Walkway and passageway dimensions ........................................................................................................120 Door dimensions..........................................................................................................................................121 ENVIRONMENT Effective temperature or corrected effective temperature............................................................................122 Summer and winter comfort zones and thermal tolerance for inhabited compartments..............................123 Windchill chart ............................................................................................................................................124 Equivalent chill temperature........................................................................................................................125 Human reaction to windchill .......................................................................................................................126 Performance decrement at different ambient temperatures .........................................................................126 Ventilation requirements .............................................................................................................................127 Specific task illumination requirements ......................................................................................................128 Recommendations for display lighting ........................................................................................................130 Brightness ratios ..........................................................................................................................................131 Workspace reflectance values......................................................................................................................132 Permissible distance between a speaker and listeners .................................................................................133 Range of acceptable reverberation time.......................................................................................................134 DESIGN FOR MAINTAINER Arm and hand access dimensions ................................................................................................................135 Whole body access opening.........................................................................................................................136 Maximum weight of units to be lifted by one person (male or female).......................................................137 Maximum design weight limits ...................................................................................................................137 Weight and dimension limits of portable test equipment ............................................................................137 Minimum handle dimensions ......................................................................................................................138 Fastener examples........................................................................................................................................139 Electrical cable coding.................................................................................................................................140 Hydraulic and pneumatic coding .................................................................................................................141 Values for color-coded fixed resistors and small capacitors........................................................................142 Color coding of fluid conductors .................................................................................................................142 SMALL SYSTEMS AND EQUIPMENT Anatomical limits on axially symmetrical ocular metal parts......................................................................143 OPERATIONAL AND MAINTENANCE GROUND/SHIPBOARD VEHICLES Recommended clearances around equipment operator's station..................................................................144 Recommended clearances around equipment operator’s station key...........................................................145 Dimensions for vehicle operator’s seat........................................................................................................146
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HAZARDS AND SAFETY Temperature exposure limits .......................................................................................................................147 Burn criteria for human skin........................................................................................................................147 Exposure limit for ultraviolet radiant energy...............................................................................................148 Permissible noise exposure..........................................................................................................................149 Shock current intensities and their probable effects ....................................................................................150 USER-COMPUTER INTERFACE Maximum acceptable system response times ..............................................................................................151
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Inch-pound equivalents, abbreviations, and prefixes
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Lines of sight
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Vertical and horizontal visual field
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Coding of simple indicator lights
4
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App
licat
ion
of v
ario
us ty
pes o
f mec
hani
cal d
ispl
ays
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Scale of markings
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Scale marker dimensions
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Relative position of scale marks, numerals, and pointers on circular dials
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Group viewing of optical projection displays
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Color coding of transilluminated displays
Color Use Examples flashing red to indicate an emergency condition that requires immediate action to avert impending injury, equipment damage, or both red to indicate that (1) the system or “no-go” a portion of the system is “error” inoperative, or (2) successful “failure” task completion is not possible “malfunction” until appropriate corrective or override action is taken yellow to indicate (1) a marginal condition, (2) an unexpected delay, (3) that caution is necessary, or (4) that rechecking is necessary green to indicate that (1) equipment is “go ahead” “in tolerance,” (2) conditions are “in tolerance” satisfactory, or (3) it is all right “ready” to proceed “function activated” white to indicate system conditions (1) indicating which of several that do not have “right” or functions has been selected, (2) “wrong” implications indicating a transitory condition such as an action or test in progress, provided such indications have no implications of success or failure blue to advise only
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Functional evaluation of audio signals
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Intelligibility criteria for voice communications signals
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Con
trols
elec
tion
criti
eria
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Recommended manual controls
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Advantages and disadvantages of various types of control coding
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Advantages and disadvantages of common controls
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Advantages and disadvantages of common controls (continued)
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Minimum, edge-to-edge separation distances for controls
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Ball controls
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Cranks
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Foot-operated switches
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Foot
-ope
rate
d co
ntro
ls
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Foot
-ope
rate
d co
ntro
ls (c
ontin
ued)
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Han
dwhe
els
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Han
dwhe
els (
cont
inue
d)
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High-torque J-handles
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Joysticks, isotonic
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Keyboards
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Nominal keyboard characteristics
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Key-operated switch
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Knobs
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Knob detent placement
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Knobs, ganged
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Legend switch
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Levers
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Leve
r con
trols
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Leve
r con
trols
(con
tinue
d)
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Leve
r con
trols
(con
tinue
d)
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Leve
rcon
trols
(con
tinue
d)
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Leve
r con
trols
(con
tinue
d)
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Mouse
41
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Pedals
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Leg strength at various knee and thigh angles
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Rep
rese
ntat
ive
push
but
ton
appl
icat
ions
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45
Push buttons
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Push
but
ton
switc
hes
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Push
but
ton
switc
hes (
cont
inue
d)
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Push
but
ton
switc
hes (
cont
inue
d)
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49
Push
-pul
l con
trols
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50
Rocker switches
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Rotary selector switch
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52
Rot
ary
sele
ctor
con
trols
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53
Rot
ary
sele
ctor
con
trols
(con
tinue
d)
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Rot
ary
sele
ctor
con
trols
(con
tinue
d)
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Slide switches
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Thumbwheel, continuous adjustment
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Thumbwheel, discrete
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Toggle switches
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Togg
le sw
itch
cont
rols
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Togg
le sw
itch
cont
rols
(con
tinue
d)
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Togg
le sw
itch
cont
rols
(con
tinue
d)
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Togg
le sw
itch
cont
rols
(con
tinue
d)
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63
Touch screens
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Two-
axis
con
trolle
rs fo
r dis
play
app
licat
ions
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Grip
switc
hes
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Grip
switc
hes (
cont
inue
d)
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Arm, hand, and thumb-finger strength (5th percentile male)
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Arm, hand, and thumb-finger strength (5th percentile male) (continued)
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Character height versus luminance
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Luminance contrast ratios for various conditions
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Stroke width for pixel-generated characters
Height-width relationship for pixel-generated characters
Minimum Maximum stroke stroke
Pixels in upper case pixel pixel character height count count 7 to 8 1 1 9 to 12 1 2 13 to 14 2 2 15 to 20 2 3 21 to 23 2 4
Minimum Preferred Maximum Pixels in upper case width pixel width pixel width pixel character height count count count 7 4 5 5 8 4 6 7 9 5 6 8 10 5 7 9 11 6 8 10 12 6 9 11 13 6 9 12 14 7 10 13 15 or 16 8 11 14
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Static human physical characteristics - head
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Static human physical characteristics – head (continued)
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Static human physical characteristics – head (continued)
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Static human physical characteristics – head (continued)
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Static human physical characteristics - seated
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Static human physical characteristics – seated (continued)
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Static human physical characteristics – seated (continued)
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Static human physical characteristics – seated (continued)
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Static human physical characteristics - standing
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Static human physical characteristics – standing (continued)
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Static human physical characteristics – standing (continued)
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Static human physical characteristics – hands
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Static human physical characteristics – standing position
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Additive effects of clothing on anthropometric measures
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Additive effects of clothing on anthropometric measures (continued)
A B C Anti-contact Wet-cold Arctic glove glove glove Hand position X Y Z X Y Z X Y Z Extended flat cm 26.7 11.9 6.4 27.2 14.5 7.6 42.2 13.7 9.1 (in) (10.5) (4.7) (2.5) (10.7) (5.7) (3.0) (16.6) (5.4) (3.6) Closed as fist cm 17.8 12.7 8.4 18.5 14.7 9.4 36.3 13.2 13.7 (in) (7.0) (5.0) (3.3) (7.3) (5.8) (3.7) (14.3) (5.2) (5.4) Grasping handle 0.6 cm (0.24 in) 17.8 12.7 8.9 18.5 14.0 8.9 35.6 14.0 11.4 diameter (7.0) (5.0) (3.5) (7.3) (5.5) (3.5) (14.0) (5.5) (4.5) 2.5 cm (1.0 in) 17.8 12.7 8.9 18.5 13.5 10.2 35.6 13.2 11.4 diameter (7.0) (5.0) (3.5) (7.3) (5.3) (4.0) (14.0) (5.2) (4.5) 5.0 cm (2.0 in) 19.0 11.4 10.7 20.3 11.9 10.2 38.1 13.7 12.7 diameter (7.5) (4.5) (4.2) (8.0) (4.7) (4.0) (15.0) (5.4) (5.0) Grasping knob 0.6 cm (0.24 in) 20.3 9.7 10.9 22.9 11.7 10.2 39.4 12.2 11.4 diameter (8.0) (3.8) (4.3) (9.0) (4.6) (4.0) (15.5) (4.8) (4.5) 2.5 cm (1.0 in) 22.8 8.9 10.2 22.9 11.4 10.2 40.1 12.2 12.2 diameter (9.0) (3.5) (4.0) (9.0) (4.5) (4.0) (15.8) (4.8) (4.8) 5.0 cm (2.0 in) 24.1 9.4 9.4 23.4 11.4 10.7 40.5 11.9 12.2 diameter (9.5) (3.7) (3.7) (9.2) (4.5) (4.1) (15.9) (4.7) (4.8)
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Joint movement ranges
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Joint movement ranges (continued)
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Joint movement ranges (continued)
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Muscle strength of the arm, hand, and thumb (5th percentile male)
Arm strength N (lb) Design criteria levels 1 2 3 4 5 6 7 Degree Pull Push Up Down In Out elbow L R L R L R L R L R L R flexion 180° 177.6 184.8 149.6 177.6 32 49.6 46.6 60.8 46.6 71.2 28.8 49.6 (40) (41.6) (33.6) (40) (7.2) (11.2) (10.4) (13.6) (10.4) (16) (6.4) (11.2) 150° 149.6 199.2 106.4 149.6 53.6 64 64 71.2 53.6 71.2 28.8 53.6 (33.6) (44.8) (24) (33.6) (12) (14.4) (14.4) (16) (12) (16) (6.4) (12) 120° 120.8 149.6 92.8 128 60.8 85.6 74.4 92.8 71.2 78.4 36 53.6 (27.2) (33.6) (20.8) (28.8) (13.6) (19.2) (16.8) (20.8) (16) (17.6) (8) (12) 90° 113.6 132 78.4 128 60.8 71.2 74.4 92.8 56.8 64 36 56.8 25.6) (29.6) (17.6) (28.8) (13.6) (16) (16.8) (20.8) (12.8) (14.4) (8.) (12.8) 60° 92.8 85.6 78.4 120.8 53.6 71.2 64 71.2 60.8 71.2 42,4 60.8 (20.8) (19.2) (17.6) (27.2) (12) (16) (14.4) (16) (13.6) (16) (9.6) (13.6) Note. L = Left R = Right
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Muscle strength of the arm, hand, and thumb (5th percentile male) (continued)
Hand and thumb-finger strength N (lb) 8 9 10 Hand grip Thumb-finger Thumb-finger L R grip (palmer) grip (tips) Momentary hold 200 208 48 48 (44.8) (47.2) (10.4) (10.4) Sustained hold 116 124 28 28 (26.4) (28) (6.4) (6.4) Note. L = Left R = Right
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Static muscle strength data for vertical pull exertions
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Static muscle strength data for vertical pull exertions (continued)
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Static muscle strength data for vertical pull exertions (continued)
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Horizontal push and pull forces that can be exerted
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Examples of push force conditions
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Anthropometric data for common working positions
A. Weight (clothed) wearing fatigues and combat boots; standing
in center of scale. 5th percentile 95th percentile Male Female Male Female Weight (kg) 58.6 48.8 90.2 74.6 (lb) 129.1 107.6 198.8 164.5 B. Stature (clothed) standing erect; heels together; weight
distributed equally on both feet; measured from standing surface to top of head.
5th percentile 95th percentile Male Female Male Female Stature (cm) 168.5 156.8 189.0 178.7 (in) 66.4 61.8 74.4 70.3 C. Functional reach- standing erect; looking straight ahead; both
shoulders against wall; right arm horizontal measured from wall to tip of index finger.
5th percentile 95th percentile Male Female Male Female Functional (cm) 72.6 64.0 86.4 79.0 reach (in) 28.6 25.2 34.0 31.1
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Anthropometric data for common working positions (continued)
D. Functional reach, extended- standing erect; looking straight ahead; right shoulder extended as far forward as possible while back of left shoulder firmly against wall; arm horizontal measured from wall to tip of index finger.
5th percentile 95th percentile Male Female Male Female Functional reach(cm) 84.2 73.5 101.2 92.7 extended (in) 33.2 28.9 39.8 36.5 E. Overhead reach height- standing with heels 23 cm (9 in) apart
and toes 15 cm (6 in) from wall; arms extended overhead with fists touching and against wall; 1st phalanges horizontal measured from floor to highest point on 1st phalanges.
5th percentile 95th percentile Male Female Male Female Overhead reach(cm) 200.4 185.3 230.5 215.1 height (in) 78.9 73.0 90.8 84.7 F. Overhead reach breadth- standing with heels 23 cm (9 in)
apart and toes 15 cm (6 in) from wall; arms extended overhead with fists touching and against wall; 1st phalanges horizontal measured horizontally across arms or shoulders, whichever is wider.
5th percentile 95th percentile Male Female Male Female Overhead reach (cm) 35.2 31.5 41.9 37.9 breadth (in) 13.9 12.4 16.5 14.9
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Anthropometric data for common working positions (continued)
G. Bent torso height- standing with feet 30 cm (12in) apart; bending over and placing palms of the hands on kneecaps; elbows and knees locked; looking forward; head tilted as far back as possible; measured from floor to top of head.
5th percentile 95th percentile Male Female Male Female Bent torso height (cm) 125.6 112.7 149.9 138.6 (in) 49.4 44.4 59.0 54.6 H. Bent torso breadth- standing with feet 30 cm (12 in) apart;
bending over and placing the palms of the hands on kneecaps; elbows and knees locked; looking forward; head tilted as far back as possible; measured as maximum horizontal distance across shoulders.
5th percentile 95th percentile Male Female Male Female Bent torso breadth (cm) 40.9 36.8 48.3 43.5 (in) 16.1 14.5 19.0 17.1 I. Overhead reach, sitting- sitting erect; right side against wall;
right arm extended upward with palm flat against wall and fingers extended; measured from sitting surface to tip of middle finger.
5th percentile 95th percentile Male Female Male Female Overhead reach sitting (cm) 127.9 117.4 146.9 139.4 (in) 50.3 46.2 57.9 54.9
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Anthropometric data for common working positions (continued)
J. Function leg length- sitting erect on edge of chair; right leg
extended forward with knee straightened; measured from heel along axis of leg to posterior waist.
5th percentile 95th percentile Male Female Male Female Functional leg (cm) 110.6 90.6 127.7 118.6 length (in) 43.5 35.7 50.3 46.7 K. Kneeling height- kneeling with toes extended and lightly
touching rear wall; torso erect with arms hanging loosely at sides; measured from floor to top of head.
5th percentile 95th percentile Male Female Male Female Kneeling height (cm) 121.9 114.5 136.9 130.3 (in) 48.0 45.1 53.9 51.3 L. Kneeling leg length- kneeling with toes extended and lightly
touching rear wall; torso erect with arms hanging loosely at sides; measured from wall to anterior portion of both knees.
5th percentile 95th percentile Male Female Male Female Kneeling leg (cm) 63.9 59.2 75.5 70.5 length (in) 25.2 23.3 29.7 27.8
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Anthropometric data for common working positions (continued)
M. Bent knee height, supine- lying supine; knees raised until the
angle between upper and lower legs approximates 60°; toes lightly touching wall; measured from floor to highest point on knees.
5th percentile 95th percentile Male Female Male Female Bent knee height (cm) 44.7 41.3 53.5 49.6 (in) 17.6 16.3 21.1 19.5 N. Horizontal length, knees bent- lying supine; knees raised
until the angle between upper and lower legs approximates 60°; toes lightly touching wall; measured from wall to top of head.
5th percentile 95th percentile Male Female Male Female Horizontal length knees bent (cm) 150.8 140.3 173.0 163.8 (in) 59.4 55.2 68.1 64.5
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Standard console dimensions
102
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Standard console dimensions key
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Seated workspace dimensions
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Seated workspace dimensions key
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Standing workspace dimensions
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Stan
ding
wor
kspa
ce d
imen
sion
s key
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Mobile workspace dimensions
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Mobile workspace dimensions key
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Recommended placement areas for controls and displays
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Seated optimum manual control space
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Type of structure in relation to angle of ascent
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Ramp dimensions
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Stair dimensions
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Stair-ladder dimensions
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Fixed-ladder dimensions
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Portable rung-ladder dimensions
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Rung-ladder and ladder-cage dimensions
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Stepladder dimensions
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Walkway and passageway dimensions
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Door dimensions
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Effective temperature or corrected effective temperature
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Sum
mer
and
win
ter c
omfo
rt zo
nes a
nd th
erm
al to
lera
nce
for i
nhab
ited
com
partm
ents
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Windchill chart
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Equi
vale
nt c
hill
tem
pera
ture
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Human reaction to windchill
Performance decrement at different ambient temperatures
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Ventilation requirements
127
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Specific task illumination requirements
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Specific task illumination requirements (continued)
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Recommendations for display lighting
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Brightness ratios
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Wor
kspa
ce re
flect
ance
val
ues
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133
Permissible distance between a speaker and listeners
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Range of acceptable reverberation time
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135
Arm and hand access dimensions
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Whole body access opening
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Maximum weight of units to be lifted by one person (male or female)
Maximum design weight limits
Weight and dimension limits of portable test equipment
Height to Distance between body and grip which lifted 150 mm (6 in) 300 mm (12 in) 460 mm (18 in) 610 mm (24 in) .9 m (3 ft) 20.2 kg (44 lb) 13.3 kg (29.3 lb) 10.1 kg (22 lb) 6.6 kg (14.7 lb) 1.5 m (5 ft) 16.8 kg (37 lb) 11.2 kg (24.7 lb) 8.4 kg (18.5 lb) 5.6 kg (12.3 lb)
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Minimum handle dimensions
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Fastener examples
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Electrical cable coding
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Hydraulic and pneumatic coding
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142
Values for color-coded fixed resistors and small capacitors
Color coding of fluid conductors
Valve handwheels Fed. Std 595 color Contents and operating levers number and chip Steam White 17886 Potable water Dark blue 15044 Nitrogen Light gray 16376 High pressure air Dark gray 16081 Low pressure air Tan 10324 Oxygen Light green 14449 Salt water Dark green 14062 Fuel oil Yellow 13538 Lube oil Yellow 13538 Fire protection Red 11105 Foam discharge Striped red/ 11105 green 14062 Gasoline Yellow 13538 Feedwater Light blue 15200 Hydraulic Orange 12246 Freon Dark purple 17100 Hydrogen Chartreuse 23814 Sewage Gold 17043
Significant figures Color Multiplier Color Tolerance 0 Black 1 Black or ±20% 1 Brown 10 no color 2 Red 100 Silver ±10% 3 Orange 1,000 Gold ± 5% 4 Yellow 10,000 5 Green 100,000 6 Blue 1,000,000 7 Violet -- 8 Gray -- 9 White -- -- Gold 0.1 -- Silver 0.01
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Anatomical limits on axially symmetrical ocular metal parts
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Recommended clearances around equipment operator’s station
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Recommended clearances around equipment operator’s station key
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Dimensions for vehicle operator’s seat
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Temperature exposure limits
Burn criteria for human skin
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Exposure limit for ultraviolet radiant energy (200 – 315 mm)
Eeff = ∑ EλSλΔλ, where: Eeff = Effective irradiance in the 200 nm to 315 nm Eλ = Measured spectral irradiance in mW/cm2 nm Sλ = Relative spectral effectiveness (dimensionless) (see below) Δλ = Bandwidth in nanometers (nm)
Wavelength (nm)
Relative spectral
effectiveness (Sλ)
Daily exposure
limit (mJ/cm2)
Effective irradiance
Eeff (mW/cm2)
Maximum exposure per day*
200 0.03 100 0.0001 8 hr 210 0.0075 40 0.0002 4 hr 220 0.12 25 0.0004 2 hr 230 0.19 16 0.0008 1 hr 240 0.3 10 0.0017 30 min
250 0.43 7 0.0033 15 min 254 0.5 6 0.005 10 min 260 0.65 4.6 0.01 5 min 270 1.0 3.0 0.05 1 min 280 0.88 3.4 0.10 30 sec
290 0.64 4.7 0.30 10 sec 300 0.30 10.0 3.00 1 sec 305 0.06 50.0 6.00 0.5 sec 310 0.015 200 30.00 0.1 sec 315 0.003 1000
* These values assume that no other occupational exposure occurs
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Permissible noise exposure
Maximum hours Sound level dBA (slow response) per day equivalent A-weighted sound level 8.0 90 6.0 92 4.0 95 3.0 97 2.0 100 1.5 102 1.0 105 0.5 110 0.25 115 Maximum 140 (peak sound impulse pressure level) noise If daily exposure involves two or more periods at differing levels, the combined effect is used. Cj/Tj is the total time of exposure at a specified level over the time of permissible exposure for that typical level, j. When the sum, ∑(Cj/Tj) of the fractions, C1/T1 + C2/T2 +...+ Cj/Tj + ...+ Cn/Tn is greater than one, the combined exposure exceeds the permissible noise limit value.
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Shock current intensities and their probable effects
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Maximum acceptable system response times