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Page Title:
Temperature, operating condition |
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|  MIL-R-81158A(WP)
4.5.4.2 Temperature, operating condition. The rear cover shall be sub-
jected to the following test procedure:
(a) Reduce the temperature to O degrees F plus or minus 5
degrees F (minus 17.78 degrees C plus or minus 2.78 degrees C) and after
maintaining this temperature for a -period of four hours, perform the
acceptance tests specified in 4.4.4.
(b) Increase the temperature to 40 degrees F plus or minus 5
degrees F (4.44 degrees C plus or minus 2.78 degrees C) in steps of 10
degrees F (5.56 degrees C) and stabilize for 30 minutes at each step.
After the 30-minute stabilizing period at 40 degrees F (4.44 degrees C)
perform the acceptance tests specified in 4.4.4.
(c) Increase the temperature to 70 degrees F plus or minus 5
degrees F (21.11 degrees C plus or minus 2.78 degrees C) in steps of 10
degrees F (5.56 degrees C) and stabilize for 30 minutes at each step.
After the 30-minute stabilizing period at 70 degrees F, perform the
acceptance tests specified in 4.4.4.
(d) Increase the temperature to 125 degrees F plus or minus 5
degrees F (51.7 degrees C plus or minus 2.78 degrees C) in steps of 10
degrees F (5.56 degrees C) and stabilize for 30 minutes at each step.
After the 30-minute stabilizing period at 125 degrees F perform the
acceptance tests specified in 4.4.4.
(e) Increase the temperature in steps of 10 degrees F (5.56
degrees C) stabilizing for 30 minutes at each step until 175 degrees F
plus or minus 5 degrees F (76.67 degrees C plus or minus 2.78 degrees C)
is reached. Stabilize for at least four hours and perform the acceptance
tests specified in 4.4.4.
(f) Reduce the temperature to 80 degrees F plus or minus 5
degrees F (26.67 degrees C plus or minus 2.78 degrees C) in steps of 10
degrees F (5.56 degrees C) and stabilize for 30 minutes at each step.
the temperature to 68 degrees F plus or minus 5
(g) Reduce
degrees F (20 degrees
C plus or minus 2.78 degrees C) and stabilize for
at least four hours.
Immediately following this temperature cycle, the
rear cover shall meet
the performance and product requirements of this
specification.
4.5.5 Humidity, nonoperating condition. The rear cover shall be sub-
jected to the following temperature cycle:
(a) Increase the temperature to 130 degrees F plus or minus 5
degrees F (54.44 degrees C plus or minus 2.78 degrees C) and the humidity
to 95 percent plus or minus 5 percent relative and maintain this condition
for eight hours.
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