MIL-PRF-85281C(AS)
3.3.11.8 Dust (fine sand). The HRS shall continue to operate as specified when exposed to
the dusty environments of 4.3.3.9.
3.4 Electroluminescent lamps.
3.4.1 Electrical requirements. The lamps shall operate from a supply of 60 Hz to 400 Hz
with variable voltage up to 130 vac.
3.4.2 Color. Each lamp shall emit green light with peak emissions at a wavelength of 540
nanometers ± 3 percent when operated at an ambient temperature of 23 ± 10 °C
(73 ± 18 °F) from a 120 vac, 400 Hz supply. There shall be no color variance in the light with
changes in supply voltage.
3.4.3 Luminance. Lamp luminance, when operated at an ambient temperature of
23 ± 10 °C (73 ± 18 °F) directly from a 120 vac, 400 Hz supply, and after a five hour luminance
stabilization period, shall have an initial luminance of not less than 18 foot lamberts. After
operating 1,000 hours, the lamp luminance shall be not less than eight foot lamberts. After
operating 3,000 hours, the lamp luminance shall be not less than 4 foot lamberts. The luminance
at any point of the luminous area shall be not greater than the luminance at any other point by
more than 15 percent.
3.4.4 Lamp characteristics. Each lamp shall consist of the electroluminescent element
housed in an enclosure capable of being bolted to a flat surface without stressing either the lamp
or the mounting hardware. Lamp electrical leads shall be shrouded in sealant, projecting not more
than 0.625 inch at the point of entry into the lamp. Lamps and electrical lead terminals shall be
hermetically sealed and prevent incursion by air, gas, or moisture.
3.5 Electrical requirements. HRS equipment shall conform to the electrical requirements as
follows:
3.5.1 Electrical power. The HRS shall operate on alternating current (ac) electrical power
having characteristics as specified in MIL-STD-1399/300 for 400 Hz, type II or III and for 60 Hz,
type I.
3.5.2 Vertical reference signal. The HRS shall accept the roll input signal from a type
18CX4, 400 Hz synchro control transmitter as specified in MIL-STD-710 and MIL-S-20708.
The transmitter output is two electrical degrees for each degree of actual ship roll.
3.6. Mechanical design. HRS equipment shall conform to the mechanical design
requirements as follows:
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