MIL-DTL-28803-4 Display, Optoelectronic, Segmented Readout, Backlighted, Style I \(Incandescent\), Dot Pattern And Bar Pattern, Type Ro4 \(Replacement Parts For Type Ro3 Display Assembly\)

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MIL�DTL�28803/4D

REQUIREMENTS:

Design and construction:

Dimensions and configurations. See figures 1 through 7 and tables I through XI.

Weight: See table X.

Light source: T�3/4 incandescent bulb (see figure 5).

Operating:

Dot to dot ratio:

Segment to segment: 3 to 1 maximum.

Digit to digit: 3 to 1 maximum.

Operating temperature: �55�C to +71�C.

Storage temperature: �55�C to +85�C.

Optical:

Chromaticity: Method I in accordance with MIL�DTL�28803.

Contrast ratio (prior to life (electrical)): 10 to 1 minimum.

Luminance: Average 300 foot-lamberts (1027.9 Candela per square meter) minimum with a supply of 5 volts.

Physical and mechanical:

Mechanical endurance, solderability, and terminal strength: Not applicable.

Electrical:

Supply voltage: 5 volts maximum.

Supply current (each lamp): .025 ampere maximum.

Circuit configurations: All circuit configurations (1 through 6) are direct wired. The segments displayed are in

accordance with the truth tables I through IX.

Truth tables. The following conventions are used in the truth tables (tables I through IX) herein:

"0"

5.0 V dc.

"Δ"

Segment lit.

Environmental:

Shock (when installed): Method I in accordance with MIL�DTL�28803.

Vibration (when installed): Grade 2 in accordance with MIL�DTL�28803.