MIL-PRF-32516
4.5.6 Temperature and humidity. The temperature and humidity tests shall be performed
in accordance with 4.5.6.1. Figures 1 and 2 show the temperature and humidity profiles. No rust
or corrosive contaminants shall be imposed on the test item by the test facility
(temperature/humidity chamber).
4.5.6.1 Procedure temperature and humidity. Install the test item in the test facility in
controlled. Relative humidity of 95 percent (with the applicable tolerance) does not include
conditions of precipitation. The rate of temperature change shall be 1 °C to 5 °C per minute. The
temperature limits and relative humidity shall be:
Not operating :
-20 °C to +70 °C
Operating:
+10 °C to +40 °C at 5 to 75 percent relative humidity.
+10 °C to +30 °C at 5 to 95 percent relative humidity.
Precipitation is not authorized during the temperature and humidity test.
4.5.6.1.1 Temperature test procedure. The temperature test procedure consists of a five
independent tests (a through e) that can be performed in any sequence, except as indicated for
test (a). The profiles provided on Figure 1 demonstrate only one possible sequence of testing.
The detailed test procedure at the time of testing shall define the actual test sequence. The
humidity during the test is uncontrolled for all tests except test (d), where the humidity shall be
controlled within the range of 5 to 20 percent relative humidity (with the applicable tolerance), to
simulate an arid environment. The testing may be interrupted after any test, a through e.
Performance of the satisfactory operation test shall occur at the end of each temperature test
period, adding whatever time is required to perform the satisfactory operation test. (This means
that the total time required to perform the temperature testing will be the cumulative total
consisting of: the time required for each temperature test, the time required to perform a
satisfactory operation test at each temperature test, and any interruption period).
a. Test (a). Place the test item in the test chamber in accordance with 4.5.2. This test is
the initial operation verification test. With the temperature at the room ambient the
equipment is operating for 2 hours, after which the satisfactory operational test is
performed. Test (a) shall always be performed first in the test sequence.
b. Test (b). The temperature is maintained at 10 °C. The equipment is not operating for 4
hours. Operate the test item for the warm-up period recommended by the manufacturer.
Perform the satisfactory operation test and compare the results with test (a) in accordance
with 4.5.3. No alignment or adjustment of other than the operating controls shall be
permitted throughout the test specified.
c. Test (c). The temperature is maintained at -40 °C. The equipment is not operating for 4
hours. Following the 4 hour cold storage soak, the temperature is raised to 23 °C. For an
additional 4 hours the equipment is maintained at these conditions. Operate the test item
for the warm-up period recommended by the manufacturer. Perform the satisfactory
operation test and compare the results with test (a) in accordance with 4.5.3. No
alignment or adjustment of other than the operating controls shall be permitted
throughout the test specified.
d. Test (d). The humidity during this test is controlled at within the range of 5 to 20
percent (with the applicable tolerance). The temperature is maintained at 40 °C. The
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