MIL-DTL-5589E
4.6.10 Thermal shock (see 3.4.9). Earphones shall be tested in accordance with method 107 of
MIL-STD-202. The following details shall apply:
a. Test condition letter: A.
b. Measurement after cycling: Frequency response in accordance with 4.6.2.
4.6.11 Vibration, high frequency (see 3.4.10). Earphones shall be tested in accordance with method
204 of MIL-STD-202. The following details shall apply:
a. Mounting specimens: Diaphragm of the earphone shall be in a vertical plane on the vibrating
machine.
b. Electrical load conditions: 60 milliwatts ring at 1,000 Hz applied to the earphones.
c. Test condition letter: A.
d. Measurement after vibration: Frequency response in accordance with 4.6.2.
4.6.12 Shock (specified pulse) (see 3.4.11). Earphones shall be tested in accordance with method
213 of MIL-STD-202. The following details shall apply:
a. Mounting method: The earphone shall be rigidly attached to an auxiliary mounting plate. The
auxiliary mounting plate shall then be rigidly attached to the anvil plate of the shock machine.
b. Test condition letter: G.
c. Measurement after shock: Frequency response in accordance with 4.6.2.
4.6.13 Salt spray (corrosion) (see 3.4.12). Earphones shall be tested in accordance with method 101
of MIL-STD-202. The following details and exceptions shall apply:
a. Applicable salt solution: 5 percent.
b. Test condition letter: A.
c. Measurement after exposure: Acoustic quality, in accordance with 4.6.14.
d. Additional conditioning: Earphones shall be cleaned as prescribed, and dried for 48 hours in a
chamber having an ambient temperature of 16°C to 32°C and a maximum relative humidity of
30 percent.
e. Additional measurement: Within 3 hours after the drying period, the earphones shall be tested
in accordance with 4.6.2.
4.6.14 Acoustic quality (see 3.4.13). The 1.1 volt ±0.1 volt ring shall be applied continuously to the
terminals of the earphone. The frequency shall be varied continuously from 100 Hz to 7,000 Hz and
back to 100 Hz. The acoustic output shall be checked for buzzing, rattling, and other spurious sounds.
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4.6.15 Fungus resistant (see 3.2.5). Prior to fabrication, earphone materials shall be tested an
accordance with method 508 of MIL-STD-810. The external surfaces shall be inspected for evidence
of fungus.
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