Specifications
MIHWD-1472E
5.2.3 .1.5.2 Intermediate marks. The number of minor or intermediate marks between
numbered scale pointers shall not exceed nine.
5.2.3.1.6 Numerals.
5.2.3 .1.6.1 Major marks. Except for measurements that are normally expressed in decimals,
whole numbers shall be used for major graduation marks.
5.2.3 .1.6.2 StartinRpo
int. Display scale shall start at zero, except where this would be
inappropriate for the function involved.
5.2.3.1.7 Pointers.
5.2.3 .1.7.1 Length The control or display pointer should extend to, but not overiap, the
shortest scale graduation marks.
5.2.3 .1.7.2 Tip confifzuration. The pointer tip should be tapered at a 20° angle (40° included
angle), terminating in a flat tip equal in width to the minor scale graduations.
5.2.3 .1.7.3 Mounting.
The pointer shall be mounted as close as possible to the face of the dial
to minimize parallax.
5.2.3 .1.7.4 Color. Pointer color from the tip to the center of the dial shall be the same as the
color of the marks. The tail of the pointer shall be the same color as the diaJ face, unless the tail is used
as an indicator itself or unless the pointer is ustxl for horizontal alignment.
5.2.3.1.8 Luminance contrast. A luminance contrast (see MXL-HDBK-1908)not iess than 3.0
shall be provided between the scale face and the markings and pointex.
5.2.3.1.9 Calibration information. Provision shall be made for placing calibration information
on instruments without degmding dial legibtity.
5.2.3.1.10 Cod@
5.2.3 .1.10.1 Use. Coding on the face of scale indicators maybe used to convey such
information as desir~ operating range, inefficient operation, caution, and dangerous level.
5.2.3 .1.10.2 Pattern- or colorading.
Operating conditions that always fail within a given
range on the scale shall be made readily identifiable by applying pattern- or color-coding to that range.
5.2.3 .1.10.3 Choice of colors. Red, yelkow, and green maybe applied, provided they conform
to the meanings specified in 5.2.2.1.18 and are distinguishable under all expected lighting conditions.
5.2.3 .1.10.4 Pattern coding. Zone scales may be shape coded when the indicator must be
viewed in blackout conditions or where the illuminant color will cause difficulty Incolor band
d~scnmmatmn.
5.2.3.2 Moving-pointer, fixed->cdg .dis@y>
II
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