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|  MIL-F-48673 (AR)
the highest specified input voltage. Thermal sensor
readings of the test item temperature shall be recorded
every 30 minutes. At the end of four hours, and while
maintaining the test conditions the test item shall be
checked for satisfactory operation and the results recorded.
I
o
55 , atmospheric
Step h.
With the test item de-energized, adjust the chamber test
conditions to 550C and ambient pressure, and maintain
until copletion of the fourth operating time period.
After the test item temperature has stabilized, the test
I
item shall be operated at the highest specified input
voltage for four time periods, each of 20 minutes. The
first three time periods of operation shall be followed by
a 15 minute period with the test items de-energized. The
test item shall be checked for satisfactory operation
during each operating time period and the results
recorded. Thermal sensor readings of the test item
I
temperature shall be recorded every 10 minutes of test item
operation.
0
52 , Atmospheric
Step i.
with the test item de-energized, adjust the chamber
0
temperature to 52 C. The test item temperature shall be
stabilized. The test item shall be operated at the highest
specified input voltage and the chamber pressure adjusted
to simulate an altitude of 10,000 feet. Maintain these
test conditions for four hours. Thermal sensor readings of
the test item temperature shall be recorded every 30
minutes. At the end of the four hour period and while
maintaining the test conditions, the test item shall be
checked for satisfactory operation and the results recorded.
0
55 C, 10,000 Feet
Step j.
With the test item de-energized, adjust the chamber
0
temperature to 55 C, and maintain until completion of the
fourth operating time period. The test item temperature
shall be stabilized. The test item shall be energized at
the highest specified input voltage and the chamber
pressure adjusted to simulate an altitude of 10,000 feet.
(Following those steps where a change in temperature at low
pressure is required, the pressure may be increased to
ambient before changing the temperature and then returned
39
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