MILDTL28803C
3.4.4 Termination. Termination shall be as specified (see 3.1).
3.4.4.1 Plug-in units. The plug-in units shall be positive keyed to achieve proper alignment of legend in relation to
fixed assembly when removed (see 3.1).
3.4.6.1 Light source circuitry. The light source circuits shall be isolated electrically from the display assembly case
and its mounting means.
3.4.6.3 Light source contacts. Light source contacts shall be of suitable material or plated to resist electrolytic
corrosion of the contact or the light source base.
3.4.7 Lens. The lens shall be free from defects which will prevent it from meeting luminous distribution and color
requirements. Unless otherwise specified, there shall be no highlight reflective surfaces on the displays.
3.4.8 Color filters. Material for lamp color filters (used to convert clear incandescent lamps to colored lighting)
shall be silicone rubber, unless otherwise specified (see 3.1).
3.4.9 Panel seals. Material for panel seals shall be silicone rubber.
3.5 Performance. The displays shall be capable of meeting the tests specified in 4.6, and the specification sheets,
as applicable. Lamp failure shall not be considered a unit failure when the lamp failure is noted immediately and a
new lamp is installed and functions, then the test shall be continued, as required. However, a light source failure for a
non-replaceable item (see 3.1) shall be considered a unit failure.
3.5.1 Visual and mechanical examination. When inspected as specified in 4.6.1, the displays, associated modules
and component parts shall conform to the acceptance requirements specified in 3.1, 3.3 (material), 3.4 (design and
3.5.2 Operating characteristics. When displays are tested as specified in 4.6.2, the operating characteristics shall
3.5.2.1 Character distortion. When displays are tested as specified in 4.6.2.1, the displayed character(s) shall
appear clear and legible.
3.5.2.2 Dot-to-dot ratio. When tested as specified in 4.6.2.2 the dot-to-dot ratio shall be as specified (see 3.1).
3.5.3 Optical characteristics. When displays are tested as specified in 4.6.3, the operating characteristics shall be
3.5.3.1 Chromaticity. When displays are tested as specified in 4.6.3.1 the requirements shall be as specified in
table I.
3.5.3.2 Contrast ratio. When displays are tested as specified in 4.6.3.2 the contrast ratio shall be as specified (see
3.1).
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