MIL-HDBK-1908B
3. DEFINITIONS
NOTE: Each term appears alphabetically, in bold face, followed by one or more italicized annotations that associate the definition to its application(s). The definitions do not necessarily apply to other applications. Annotations are used as follows:
gen General human engineering applications.
uci User/computer interface or interaction. Applies to terms that have specific meaning when used in the context of user-computer interaction or supporting human engineering application of computers
snv Sound, noise, vibration. Applies to materiel design standards for acoustics and vibration that involve maximum limits for exposure to steady-state or impulse noise,
voice/audio communication, aural non-detectability, or habitability.
dsi Display symbol information. Applies to design criteria and standards for symbolic and alphanumeric information used on electronically and optically generated displays-- primarily airborne displays. Does not include qualities that affect legibility, such as resolution, brightness, uniformity, contrast, flicker, noise, minimum line movement, or color, that may appear as gen or uci definitions.
acq Acquisition. Includes (a) human engineering tasking requirements and guidelines, (b) non- human factors acquisition terms frequently used to express programmatic human factors provisions, and (c) equipment terms used to express human engineering programmatic, design, and test provisions.
A term having more than one definition is listed separately for each application-dependent definition. A term used by several or all applications is designated as gen. Terms for sub-definitions are underlined and presented in alphabetical order under the major term to which they apply. Acoustical terms not appearing below are defined in accordance with ANSI S1.1. Anthropometric terms are defined by
MIL-HDBK-743.
A-duration (pressure wave duration) snv. The time required for the pressure to rise to its principal positive peak and return momentarily to ambient pressure (see Figure 1).
A-weighted sound level (dBA) snv. Sound pressure level (in decibels) measured using a sound level meter with an A-weighting network. The A-weighted response is maximum at 2500 Hz and drops rapidly as frequency decreases below 1000 Hz and gradually decreases above 4000 Hz, thereby approximating the frequency dependent human response to moderate sound levels. See ANSI S1.4 for definition of A-weighting filter characteristics.
Abort uci. A capability that cancels all user entries in a defined transaction sequence.
Accessible gen. An item is considered accessible when it can be operated, manipulated, serviced, removed, or replaced by the suitably clothed and equipped user with applicable body dimensions conforming to the anthropometric range and database specified by the procuring activity or if not specified by the procuring activity, with applicable 5th to 95th percentile body dimensions. Applicable body dimensions are those dimensions which are design-critical to the operation, manipulation, removal, or replacement task.
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