MIL-DTL-25308C
4.5.7 Seasoning. The gage shall be operated for 10,000 cycles at a rate of 30±10 cycles per
second (cps) from zero indication to 1600±100 psi (80±5% of full scale) and back to zero
indication. Within 1 hour after the conclusion of this test, the gage shall be subjected to the scale
error test. The scale errors shall not exceed the tolerances specified in table II. The gage shall
then be examined to determine that no undue wear has occurred.
4.5.8 Temperature-altitude. The temperature-altitude test shall be conducted in accordance with
MIL-STD-810B dated 15 June 1967 (including corrections of notice 4, dated 21 September
1970), method 504, procedure I, except the temperature shall be -55°C (-67°F) and the chamber
pressure shall be the equivalent to an altitude of 100,000 feet. The rate of pressure change shall
not exceed an average of 3 feet per second (fps) while under these conditions. At the end of a 1
hour period and while still at the temperature and altitude specified, the scale and friction error
test shall be conducted. The errors shall not exceed the tolerances specified in tables I and II.
This test may be conducted concurrently with the low temperature exposure test.
4.5.9 Low temperature exposure. The gage shall be subjected to a low temperature test in
accordance with MIL-STD-810, method 502, procedure for operational testing (procedure II), at
-65°C±2°C (-85°F±4°F) for a minimum of 48 hours after which it shall be operated throughout
its entire range to determine that there is no sticky or erratic performance. The temperature shall
then be raised to -54°C±2°C (-65°F±4°F) and the gage subjected to the scale error test. The
scale errors shall not exceed the tolerances specified in table I for low temperature. After
completion of the low temperature testing, the gage shall be returned to room temperature for a
minimum of 4 hours and subjected to the scale error test. The scale errors shall not exceed the
tolerances specified in table I for room temperature.
4.5.10 High temperature exposure. The gage shall be placed in a temperature chamber and
subjected to 145°C±2°C (293°F±4°F) for a period of 24 hours. The gage shall then be subjected
to the scale error test. The scale errors shall not exceed the tolerances specified in table I for
high temperature exposure. It shall then be returned to room temperature for a minimum of 4
hours after which it subjected to the scale error test at room temperature. The scale errors shall
not exceed the tolerances specified in table I for room temperature.
4.5.11 Humidity. The gage shall be subjected to a humidity test in accordance with MIL-STD-
810, method 507, procedure II (Aggravated) except that the temperature and humidity shall be as
specified in figure 3 herein. A minimum of 10 cycles shall be performed. Intermediate
performance testing is not required. External connections to the gage shall be made to simulate
installed conditions. Immediately after completion of this test, the gage shall be subjected to the
scale and friction error tests. The scale and friction errors shall not exceed the tolerances
specified in tables I and II.
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