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AAT ICAS 2190 ✧ design of IDC radialSMH analog interface

document note: this document is part of the Integrated Chronological Applications System (ICAS). Alliance for the Advancement of Technology (AAT) provides ICAS standards documents subject to terms of use described in document AAT ICAS 9010. please refer to other key AAT ICAS standards documents accessible via the AAT ICAS web site at for important information about ICAS.


design of IDC radialSMH analog interface

this document describes AAT ICAS design specifications for the IDC radialSMH analog interface. radialSMH is a circular analog interface derived from the traditional clock interface representing seconds, minutes, and hours. radialSMH is specified in support of the use of multiple scales in the development and use of ICAS methods and applications, and this document is specified similar to the AAT ICAS 2120-IDC radialDAI analog interface specification. the following specification describes basic characteristics of systems of indices and unit phases for radialSMH clock interfaces. please reference AAT ICAS 2110-IDC interface timesetting specifications for additional information.

radialSMH is specified for a circular dial face featuring a system of dial identification, a system of dial indices, and a corresponding system of clock unit phases.

the usability of a radialSMH interface is relative the design of particular radialSMH features in terms of the size, color, contrast, and visibility of the interface and components thereof. designers of ICAS methods and applications should consider the use of design schemes to support ease of use in terms of legibility, readability, and instrument functionality. the sizing and display of an interface and the components thereof should accommodate usability of any of the dial configurations implemented.


dial identification

an appropriate dial term or symbol should be prominently displayed on or adjacent the dial interface to indicate the particular dial interface. the use of numerals for dial terms should be avoided, as the use of numerals should be reserved for the labeling of indices and for the representation of time values. some AAT ICAS IDC dial terms are consequently represented in terms of roman numerals for this reason.


dial indices

radialSMH should possess a system of 12 major-unit indices equally spaced around a circular dial, with a system of 60 minor-unit indices superimposed on the major-unit indices, with a '12' (twelve) major-unit indice situated at the top of the dial. the top of a radialSMH should be readily clear by means of one or more graphic features prominently displayed on the interface (for example dial identifier terms such as 'hour' or 'dialHour'). indices may be represented by a series of short radial rules arranged around the dial edge.

particular indice rules may be differentiated by weight, length, color, or luminescence. radialSMH should support capability to display all 60 dial indices. the hour indices (12, 1, 2, . . . 11) should be displayed more prominently than the other unit indices.

particular indice rules may also be labeled in support of interface usability. labeling of radialSMH indices should be represented in terms of arabic numbers for easier readability. if however the radialSMH is displayed with a digitalSMH interface (please see AAT ICAS 2100-ICAS digital interface guidelines) superimposed onto the analog display, then labeling of the analog indices may be prudently omitted.


unit phasing

radialSMH displays should support a designated number of clock unit phases, however the number of clock unit phases may also be determined by the particular method or application. a strictly-formed radialSMH dial supports up to three clock units phasing clockwise from an axis at the center of the dial: a major unit phase, a minor unit phase, and a subminor unit phase.

the design scheme of the clock unit phasing should represent the phasing rates of the units. for example, a clock unit indicator with a slower phase rate may be represented thicker and shorter than an indicator with a faster phase rate. in addition, a clock unit design scheme for the identification of any particular clock unit indicator, and for the reference of any unit indicator to a corresponding unit indice, should be readily clear.

particular pointers may phase continuously or incrementally (please see AAT ICAS 2210).

top document updated:

system identifiersdatetime
Uniform CalendarUCUCN 12019 S19 Yellow
Inter-Dial ClockIDCzone(UT)t339 tt050
'ICAS in use' can accommodate calendar and clock formatting 'for all people, for all time'.
day of yearD-o-YAD common year day139
Gregorian calendarGG2019 May 19 Sunday
seconds, minutes, hoursSMHUT08:08:14
style legend


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