MIL-DTL-62187C
time sweep. Test level shall be in accordance with the curve of figure 7. Resonant frequencies
of the regulator shall be determined and a sinusoidal resonance search shall be conducted for the
four most severe resonant frequencies of the unit. The regulator shall be subjected to 16.34
minutes at each severe resonant frequency within each 100 minutes sweep test. The frequency of
applied vibration shall be swept over the specified range in accordance with figure 8. The sweep
time is that of an ascending plus a descending time shown on figure 8. The vibration resistance
test shall be performed at an ambient temperature of -65F and 225F (-54 to 107C). There
shall be no evidence of damage.
4.4.4.3 Waterproofness verification. To determine conformance to 3.6.3, the regulator
shall be submerged into a salt water bath at 73 18F (23 +10C) with a minimum depth of 1
inch (2.54 centimeters (cm)) covering the unit. A 10 psig (69 kPa) vacuum shall be applied and
the regulator operated in accordance with 4.4.1.1. The unit shall be removed from the bath and
thoroughly dried. Carefully remove the cover and inspect the regulator for water leakage.
Evidence of moisture in or on the regulator interior shall constitute a failure of this test.
Carefully replace the cover, remove the vacuum pump and connect to a dry nitrogen source.
Submerge the regulator as before, apply 10 psig dry nitrogen pressure and test in accordance
with 4.4.1.1. Escaping bubbles from the regulator interior shall constitute a failure of this test.
4.4.4.3.1 Abbreviated waterproofness verification. The regulator shall be subjected to
and pass the test of 4.4.4.3 except that only a non-operational pressurization test shall be
conducted, using compressed air instead of nitrogen (see 4.1.2).
4.4.4.4 Extreme temperature verification. To determine conformance to 3.6.4, the
regulator shall be placed in a chamber suitable for the development and maintenance of the
specified temperatures specified below.
a. Low temperature. After stabilization in the chamber, the regulator shall be kept at
-80F (-62C) for 12 hours. After storage at -80F (-62C), the temperature shall
be raised to -65F (-54C). When stabilized at this temperature, the regulator
shall be subjected to and pass the test as specified in 4.4.1.1.1, 4.4.1.2.1, 4.4.1.3.1,
4.4.1.4.1, 4.4.1.5, 4.4.1.6.1, 4.4.1.8, 4.4.1.10, and 4.4.3.4.
b. High temperature. With the regulator installed as ready to operate, the internal
chamber temperature shall be raised to 160F (71C) within 1 hour time period.
This temperature shall be maintained for an additional 4 hours. The internal
chamber temperature shall then be lowered to 120F (49C) within a 1 hour time
period. This cycle shall be repeated three times for a total of 36 hours. The
internal chamber temperature shall be adjusted to 225F (107C) and maintained
until the regulator is temperature stabilized. The regulator shall be operated and
pass the tests as specified in 4.4.1.1.1, 4.4.1.2.1, 4.4.1.3.1, 4.4.1.4.1, 4.4.1.5,
4.4.1.6.1, 4.4.1.8, 4.4.1.10, and 4.4.3.4. The regulator shall be returned and
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