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|  MIL-D-85859(AS)
Perform operation tests of 4.5.1.2.
d. Step 5.
e. Step 6. The distribution box shall be operated during the return to
standard ambient conditions.
f. The rate of temperature change (steps 2, 4, and 6) shall be between
1 and 5C per minute.
4.7.2 Low temperature. The distribution box shall be subjected to low
temperature tests in accordance with MIL-STD-810, Method 502.2, Procedure I
modified as follows.
a.
Step 1. Perform the operation tests of 4.5.1.2 under the closely
controlled conditions of MIL-STD-810.
b. Step 2. The low storage temperature shall be -62C. The relative
humidity shall be uncontrolled during temperature transition and
while at storage temperature. The storage temperature shall be
maintained for 24 hours, The distribution box shall be maintained
at -62C for 4 hours and then -55C for the following 20 hours.
c.
The lowest operating temperature shall be -40C. Stabilize
Step 4.
the test set temperature for 2 hours.
d.
Step 5. Energize the distribution box and allow the warm-up time
specified in 3.4.4.2.
e.
Step 6. The distribution box shall be operated during the return to
controlled ambient conditions. Stabilize the test set temperatures
for 2 hours.
f. Step 7.
Perform the operation test of 4.5.1.2.
The rate of temperature change (steps 2, 4, and 6) shall be between
g.
1 and 5C per minute.
4.7.3 Humidity. The distribution box shall be subjected to the humidity
test specified in MIL-STD-810, Method 507.2, Procedure III.
4.7.4 Watertight. The distribution box shall be watertight tested in
accordance with MIL-STD-108. The distribution box shall be operated during
an after exposure.
4.7.5 Fungus. Susceptibility of the distribution box to fungus growth
shall be determined by examining the list of materials using the criteria in
MIL-STD-454, Requirement 4, to identify fungi nutrient materials.
4.7.6 Altitude. The distribution box shall be subjected to an altitude
test in accordance with MIL-STD-810, Method 500.2, Procedure I, except the
simulated altitudes shall be 15,000 feet (operating) and 40,000 feet
(nonoperating). The following details shall modify the MIL-STD-810 when
necessary:
Pretest data:
a.
Perform the operation test of 4.5.1.2.
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