MIL-DTL-52876D
advantageous life cycle costs. Used, rebuilt or remanufactured components,
pieces and parts shall not be incorporated in the monitor cabinets.
3.4 Environmental conditions. When tested as specified in 4.4.2.7, the
monitor cabinets and major components, when furnished separately, shall
withstand individual environmental conditions specified herein, or
combinations thereof, without damage (see 6.3.2), performance degradation, or
malfunction.
3.4.1
Operational.
a.
Temperature range of -20 to +150 °F.
b.
Humidity up to 95 percent relative.
3.4.2
Non-operational condition and storage.
a.
Temperature range of -30 to +165 °F.
b.
Humidity up to 95 percent relative.
c.
Shock: bench handling (major components only), equipment not
operating.
3.5 Detailed technical requirements. The monitor cabinets and major
components when furnished separately shall perform as specified herein under
any of the operating test conditions specified herein.
3.5.1 Wiring. Monitor cabinet internal wiring and wiring harnesses shall
be in accordance with the wire list on the applicable top assembly drawing
(TA13220E3900, TA13220E4000, TA13220E4100). Transmission line brackets
containing lightning and EMI suppression components shall be in accordance
with applicable top assembly drawings.
3.5.2 Signal module assembly. The signal module assembly shall contain an
audible signaling device and the monitor cabinet alternating current (ac)
power status indicator lamps.
3.5.2.1 Audible signaling device. When actuated, the signaling device
shall sound at a frequency of 2900 ±500 Hertz (Hz) and an amplitude not less
than 60 decibels (db) referenced to 0.0002 microbars sound pressure level at a
distance of 10 feet on-axis, using "A" frequency weighting. The signal device
shall sound whenever less than 1 volt direct current (Vdc) is being applied to
terminal board 1, terminal 1 (TB1-1), referenced to ground, of the signal
module. It shall also sound whenever the ac power status indicator lamps are
flashing (see 3.5.2.2). The audible signaling device shall be silent when
both of the following conditions exist: a voltage of 4 to 5 Vdc is applied to
TB1-1; the ac power status indicator lamps are continuously on or off (not
flashing).
3.5.2.2 Monitor cabinet ac power status indicator lamps. When the monitor
cabinet is operating on external 117 (+8, -7) volts ac (Vac) power, the ac
power status indicator lamps shall be continuously lit. When the monitor unit
is operating on standby power, the ac power status indicator lamps shall be
continuously off. When the external ac power to the monitor cabinet is
removed for a period of 3 ±0.5 seconds or when ac power is re-applied to the
monitor cabinet after having been removed, the lamps shall begin to flash at a
frequency of 4 ±0.5 Hz. When the "LAMP TEST/ACKNOWLEDGE" switch is
momentarily set to "ACKNOWLEDGE", the flashing lamps shall go to continuously
off if the ac power is not present at the time of acknowledge, or to
continuously lit if the ac power has been restored at the time of acknowledge.
Actuation of the switch to "ACKNOWLEDGE" shall at no time prohibit the receipt
of any power status change from resulting in the operation described above.
Actuation of the switch to the "LAMP TEST" position shall cause both lamps to
be continuously lit while the switch is actuated.
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