MIL-DTL-9415B
The impedance, sensitivity, and response-frequency characteristic of the loudspeaker and the gain and distortion
of the amplifier shall be measured before the test, and within 1 hour after completion of the test. The complete
assembly shall be inspected for evidence of mechanical impairment after the test. The loudspeaker lead connector
shall not shift from the initially engaged position with the amplifier pin terminals as a result of the 15g shock test.
4.5.3.10.2 Shock test (30g). The complete assembly shall be securely fastened to the shock testing machine and
subjected to a shock of 30g applied for the duration of 11 milliseconds ± 1 millisecond in each of the following
directions:
a. Each of two directions parallel to the height dimension.
b. Each of two directions parallel to the width dimension.
c. Each of two directions parallel to the length dimension.
The complete assembly shall be examined after the test.
4.5.3.11 Fungus (see 3.14.7). The complete assembly loudspeaker shall be tested to a 28-day fungus resistance
in accordance with method 508 of MIL-STD-810. The following details shall apply:
a. The complete assembly shall be placed in the test chamber with the face of the loudspeaker exposed.
b. The impedance, sensitivity, and response-frequency characteristic of the loudspeaker and the gain and
distortion of the amplifier shall be measured before the test, within 1 hour after the test, and 24 hours after
the test.
c. The complete assembly shall be inspected for evidence of mechanical impairment after the test.
4.5.3.12 Salt fog (see 3.14.8). The complete assembly shall be subjected to a 48-hour salt fog in accordance with
method 509 of MIL-STD-810.
a. The complete assembly shall be placed in the test chamber with the face of the loudspeaker exposed.
b. The impedance, sensitivity, and response-frequency characteristic of the loudspeaker and the gain and
distortion of the amplifier shall be measured before the test, within 1 hour after the test, and 24 hours after
the test.
c. The complete assembly shall be inspected for evidence of mechanical impairment after the test.
4.5.3.13 Explosive decompression test (see 3.14.9). The complete assembly shall be subjected to 10 consecutive
explosive decompressions from an altitude of 8,000 feet to an altitude of 35,000 feet (corresponding to pressures of
22.2 inches of mercury to 7.04 inches of mercury). Each complete decompression or change of pressure shall take
place in not more than 0.1 second. The complete assembly shall be placed in the test chamber with the face of the
loudspeaker exposed. The complete assembly shall be inspected for evidence of mechanical impairment after the
test. The impedance, sensitivity, and response-frequency characteristic of the loudspeaker and the gain and
distortion of the amplifier shall be measured before the test and after completion of the test.
4.5.3.14 Gun blast test (see 3.14.10). The complete assembly shall be mounted on the carriage of the U. S. Navy
simulated gun blast equipment. The front edge of the complete assembly shall be positioned in the test plane, and its
axis shall be coincident with that of the explosion chamber. The complete assembly shall be subjected to 30 rounds
of blast at a peak pressure of 1.5 pounds per square inch, which shall be reached in a time interval not greater than
0.001 second. The complete assembly shall be inspected for evidence of mechanical impairment after the test. The
impedance, sensitivity, and response-frequency characteristic of the loudspeaker and the gain and distortion of the
amplifier shall be measured before the test and after completion of the test.
4.5.3.15 Explosion proof tests (see 3.14.11 and 3.6). The complete assembly loudspeaker shall be tested in
accordance with method 511 of MIL-STD-810. The following details shall apply:
a. The complete assembly shall be turned on, allowed to remain in the ON position for 2 minutes, and then
turned off.
b. This operation cycle shall be performed 10 times.
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