MIL-PRF-49503C (MI)
polarity, shading, and brightness contrast shall be used when the use of color is not
possible due to equipment capabilities.
e. Location, pattern, color, graphical, and symbol coding. These techniques shall be used where
appropriate to save time for the operator or the ATE. For example, if a UUT test path schematic is
presented on the screen, the signal flow will be highlighted by color or pattern to aid the operator
in tracing the signal flow.
f. Audio prompting. Audio codes may be used, as appropriate, to satisfy or supplement a
requirement for video prompting. The choice of specific audio codes shall be consistent with the
following principles:
(1) The number of sound signals shall be limited to four (bell, beep, buzz, etc.). Steady
signals that resemble hisses, static or sporadic radio signals shall not be used.
(2) Each sound shall have only one meaning. Once a particular sound signal code is
established for a given operating situation, the same signal shall not be designated for
some other display.
(3) Audio levels shall be consistent throughout.
(4) Audible signals shall be easily discernible from any ongoing input.
3.2.2.9 Display generation. The TP shall acknowledge the command execution whenever the
operator requests a data display or a new display. This shall be accomplished by either
performance of the requested action, or by an advisory message such as "PLEASE WAIT".
3.2.2.9.1 Display update rates. The update rates of system information being displayed in a tabular form
shall be neither so slow nor so fast as to render the data unusable in the intended manner.
3.2.2.9.2 Visual integration. Graphic displays requiring operator visual integration of rapidly changing
patterns shall be updated at a rate that shall be neither so slow nor so fast as to render the data unusable in
the intended manner.
3.2.2.9.3 Display freeze. If possible, a display freeze option shall be provided to stop the program and
allow close scrutiny of a selected frame.
3.2.2.9.4 Freeze feedback. An appropriate feedback label shall be provided to remind the operator when
the display is in the freeze mode.
3.2.2.10 Error messages. Error messages shall be brief, specific, task oriented, clear, and
understandable. The messages shall be constructive and neutral in tone. Messages that suggest
a judgment of the operator's behavior shall not be used. The error message shall not imply blame
to the operator nor attempt humor. The TP shall display an error message only after a completed
entry. When possible, the operator shall be prompted to re-enter only that portion of the
command entry that is not correct; however, the operator shall have the option of correcting the
entire entry. The TP shall require the operator to confirm potentially destructive data or
command entries before execution.
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