MIL-DTL-13253E
4.7.5 Operational (talk) (see 3.8). Completely assembled handsets shall be tested by a two-way talk-
test to insure correct wiring and satisfactory operation.
4.7.6 Vibration (see 3.9). The handset shall be tested for vibration in accordance with method 201 of
MIL-STD-202. The following details shall apply:
a. Visual-mechanical examination shall be made prior to the vibration.
b. During the vibration, the handset shall be wired as specified in the operational (talk) test (see
4.7.5).
c. Method of mounting shall be as prescribed in the procedure of the test method.
d. After the test, the handset shall be examined for loose and defective parts and the frequency-
response shall be measured, as specified in MIL-M-13189.
4.7.7 Moisture resistance (see 3.10). The complete handset shall be tested in accordance with method
106 of MIL-STD-202. The following details shall apply:
a. Mounting - Any convenient mounting with the front face of microphone cap and the receiver cap
exposed, and facing the air current, if any.
b. Polarizing voltage - Not applicable.
c. Step 7b - Not applicable.
d. Final measurements - At the completion of the tenth cycle and following a 24-hour period at 25 ± 5
degrees C and 50 ± 5 percent relative humidity, the handset shall be tested for frequency
response in accordance with MIL-M-13189 and examined for loose or deformed parts, corrosion,
or other damage.
4.7.8 Random drop (see 3.11). The handset shall be dropped six times from a height of 4 feet onto a
concrete floor. The handset shall strike at least once on the receiver and once on the transmitter end.
The frequency response shall be measured, as specified in MIL-M -13189, and the headset shall be
examined for damage.
4.7.9 Temperature cycling (see 3.12). The equipment shall be tested in accordance with method 102
of MIL-STD-202. The following details shall apply:
a. Test condition letter
-
D.
b. Measurement after cycling -
The equipment shall be examined for damage and the frequency
response shall be measured, as specified in MIL-M-13189.
4.7.10 Switch test (when applicable, see 3.13). The switch shall be subjected to 100,000 make-and-
break cycles at a rate not to exceed 12 cycles per minute. Tests requiring repetitive operation of switches
shall be made using a suitable device arranged to move the switch lever into each "ON" position and back
to the original position to complete one cycle of operation, and thereby causing the switching mechanism
to make-and-break (or break-and-make) all the circuits, in which the switch is connected.
4.7.11 Fungus (see 3.3.1). At the option of the contractor, the contractor shall certify that the materials
are fungus resistant materials, or test method 508 of MIL-STD-810 shall be performed.
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