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|  MIL-S -70442 (AR
APPE N DI x B
r tempe rat ure shall not be
ing the cooling period, the
1.
0
er than -60 C.
A
One temperature
cycle shall start with the equipment at high
temperature and
off (cooled and stabilized) at low temperature
During the cycle, the equipment shall operate in
for two hours.
its normal duty cycle. The equipment will be on
accordance with
for five hours, two of which will be at high temperature. The
chamber will be dehumidified when operating the HUD to protect
the optics.
Equipment ON; input voltage (28 VDC) at 100%, 100%, and 90%,
3.
respectively, during 1/3 of the total time of heating period
plus high temperature period; momentarily off between input
voltage changes.
A
Equipment OFF.
A
Vibration - 2.2G + 10% peak acceleration value at any non-
q
resonant frequency between 20 and 60 Hertz (Hz) measured at the
mounting points of the equipment. The vibration shall be at
least 10 minutes during each hour of operating time.
o
6.
Transition rate between temperature levels shall average 5 C
per minute.
72
GOVERNMENT
PRI NTIN G
OFFICE:
1357
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