MIL-DTL-5589E
c. Points of application: Earphone - between one of the terminals and the clamping ring, the
metallic case, or other metallic surface which is not covered by a nonconducting coating.
Simultaneously, the coil shall be excited with 9.5 volts rms at 200 Hz.
*
4.6.6 Stray magnetic field (see 3.4.5). Stray magnetic field measurements shall be made in a
shielded room or in an area free from appreciable magnetic disturbances. The earphone shall be rotated
on its axis at various points of an 8 inch radius sphere surrounding a A-A-52024, Type II, Compass, or
equal.
4.6.7 Endurance (see 3.4.6). Audio power of 300 milliwatts ring at 1,000 Hz shall be applied
continuously to each earphone under test for 8 hours. During the last hour of test, the earphones shall be
checked for audible rattles or other signs of failure. At the end of the 8 hours, the frequency response
shall be measured as specified in 4.6.2.
4.6.8 Moisture resistance (see 3.4.7). The earphone shall be tested in accordance with method 106 of
MIL-STD-202. The following details and exceptions shall apply:
a. Initial measurements: Not applicable.
b. Mounting: Any convenient mounting with the front face of the earphone exposed and parallel
with the vertical plane.
c. Loading voltage: Not applicable.
d. Final measurements: At the completion of the tenth cycle and following a 24-hour period at
25°C ±5°C and 50 percent ±5 percent relative humidity, the earphone element shall be tested
for frequency response, harmonic distortion, and dielectric withstanding voltage in accordance
with
4.6.2, 4.6.4, and 4.6.5, respectively and examined for loose or deformed parts and other
damage.
4.6.9 Barometric pressure (reduced) (see 3.4.8). Earphones shall be tested in accordance with
method 105 of MIL-STD-202. The following details shall apply:
a. Method of mounting: Not applicable.
b. Test condition letter: B.
c. Tests during subjection to reduced pressure: None required.
d. Tests after subjection to reduced pressure: Frequency response in accordance with 4.6.2.
e. Exposure time prior to measurements: 10 minutes.
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