MIL-PRF-25670B
3.5.12 Thermal shock. (see 4.5.13) The product shall resist degradation in performance when
exposed to alternating temperature extremes, and the frequency response and sensitivity shall not
vary more than ± 3 dB from the initial readings recorded in accordance with 3.5.1 and 3.5.2,
respectively.
3.5.13 Vibration, high frequency. (see 4.5.14) The product shall resist degradation in performance
due to high-frequency vibration, exhibiting no structural failure or other defects as a result, and the
frequency response and sensitivity shall not vary more than ± 3 dB from the initial readings recorded
in accordance with 3.5.1 and 3.5.2, respectively.
3.5.14 Shock (specified pulse). (see 4.5.15) The product shall resist degradation in performance
due to shock, exhibiting no evidence of breaking, cracks, deformation or loosening of parts which would
cause the product to fail. Minor dents and scratches which do not impair acoustic performance shall be
ignored. Following the test, the frequency response and sensitivity shall not vary more than ± 3 dB from
the initial readings recorded in accordance with 3.5.1 and 3.5.2, respectively.
3.5.15 Salt spray (corrosion). (see 4.5.16) The product shall resist degradation in performance
due to salt-spray, and shall meet the specified frequency response (see 3.5.1) and sensitivity (see
3.5.2) and dielectric withstanding voltage (see 3.5.5) requirements.
3.5.16 Fungus resistant. (see 4.5.17) The product shall be constructed of fungus-inert materials,
and shall show no evidence of fungus or other corrosion which may cause a mechanical failure. The
frequency response and sensitivity shall not degrade due to fungus, and shall be in accordance with
3.5.1 and 3.5.2.
3.6 Marking. Earphone elements shall be marked in accordance with MIL-STD-1285 with the
type designation, date code, and manufacturer's Contractor And Government Entity (CAGE) code, as
specified (see 3.1).
3.7 Workmanship. Earphone elements shall be processed in such a manner as to be uniform in
quality, and shall be free from loose parts, excess solder, sharp edges, burrs, flaking, scratches,
peeling, metal chips, and other foreign material. Soldering, impregnation of coils, plating, staking,
riveting, and machine screw assemblage shall be neat and thorough. The coil shall be centered
properly, void of foreign objects in the air gap and shall not drag on the frame or magnet. There shall
be no foreign material present in the air gap when viewed through a microscope having a minimum
magnification of 15.
4. VERIFICATION
4.1
Classification of inspections. The inspections specified herein are classified as follows:
a. Qualification inspection (see 4.3).
b. Conformance inspection (see 4.4).
4.2 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed
under the following conditions:
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