MIL-DTL-25308C
4.5.12 Salt fog. The gage shall be subjected to a salt fog test in accordance with MIL-STD-810,
method 509. There should be no evidence of external corrosion or deterioration that might affect
subsequent operation. The gage shall be subjected to the scale error test. The scale errors shall
not exceed the tolerances specified in table I for room temperature.
4.5.13 Fungus. The gage shall be subjected to a fungus test in accordance with MIL-STD-810,
method 508 after completion of qualification testing and after the gage has been subjected to the
salt fog test. The gage shall be disassembled so that the internal mechanism will be exposed to
the fungus spores. At the end if the test period, the gage shall be examined to determine that no
fungus growth has occurred.
4.5.14 Dust. The gage shall be subjected to a dust test in accordance with MIL-STD-810,
method 510, procedure I (Blowing Dust). At the completion of this test, the gage shall be
removed from the test chamber, allowed to cool to room temperature, and then subjected to the
scale and friction error test. The scale and friction errors shall not exceed the tolerances
specified in tables I and II for room temperature.
4.5.15 Overpressure. The gage shall be subjected to the pressure specified in table II for a
period of 10 minutes. Not less than 1 hour after application of the specified pressure, the gage
shall be subjected to the scale error test at room temperature. The scale errors shall not exceed
the tolerances specified in table II.
4.5.16 Reliability. Seven gages shall be tested for reliability. MIL-HDBK-781 may be used for
guidance in performing the reliability tests. If acceptance criteria is not specified in the
procurement document (see 6.2), test plan I-D may be used for guidance. MIL-HDBK-781 may
also be used for guidance in recording, data handling and reporting.
4.5.16.1 Test. The test equipment and fixtures shall include provisions for vibration and
temperature cycling at periodic intervals specified herein. During this test, input pressure shall
be applied at the gage at a rate of 2 to 3 cycles per minute (cpm) from 1000 to 3000 psi (25 to
75% of full scale) and return. Completion of 4 hours of operation shall include at least 480
operational cycles. For at least 10 minutes out of each hour of ON time, the gage shall be
vibrated at 2.2G±10% at any non-resonant frequency between 20 and 60 cps measured at the
mounting points of the equipment. The temperature cycles shall be conducted in the following
sequence: 4 hours at -20°C (-4°F), 14 minutes for temperature change to 50°C (122°F) at a
minimum rate of 5°C (9°F) per minute, 4 hours at 50°C (122°F), 14 minutes for temperature
change to -20°C (-4°F) at a minimum rate of 5°C (9°F) per minute, and 4 hours at -20°C (-4°F).
In case of malfunction, the malfunction shall be recorded and the test interrupted while repairs
are made. Upon completion of each 250 hours of cycling, the gages shall be subjected to the
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