MIL-DTL-11134G
4.6.2.3.5 Aging. Perform the measurements of frequency response, impedance and carbon noise, before and
after the vibration sweep specified in IEEE 258 to determine compliance with 3.5.3.6.
4.6.2.4 Earphone.
4.6.2.4.1 Response. Constant-available-power (2 mW) frequency response measurements shall be made at 300,
500, 1,000, 2,000, 3,000 and 4,000 Hz. Response measurements shall be made in accordance with ANSI S3.7 in a
type-1 earphone coupler except that the coupling weight shall be one kilogram. Determine compliance with 3.5.4.2.
4.6.2.4.2 Overload. Operate the earphone at 10 volts, 400 Hz, for a period of 10 hours. Repeat the response
tests at the 2 milliwatt level for compliance with 3.5.4.3.
4.6.2.4.3 Impedance. Using the procedures described an ANSI S3.7, measure the impedance at 1,000 Hz for
compliance with 3.5.4.4.
4.6.2.5 Push-to-talk switch.
4.6.2.5.1 Make-break sequence. Connect suitable low current lamp indicating circuits to pins F and H of the
connector (control circuit) to pins E and D of the connector (microphone circuit). Slowly operate and release the
push-to-talk switch and determine compliance with 3.5.5.1.
4.6.2.5.2 Endurance. Connect a variable resistive load in series with 24 volts dc between connector pins F and H
(control circuit) and adjust the load to one ampere. Operate the switch to full travel and off at a rate of 25 to 60 cycles
per minute for a total of 500,000 cycles. At the conclusion of the test, determine compliance with 3.5.5.1, and 3.5.5.2.
4.7 Environmental conditions.
4.7.1 Temperature.
4.7.1.1 Low. The equipment shall be tested in accordance with method 502, procedure I of MIL-STD-810. The
storage temperature shall be -55° C, maintained for 4 hours, and the operating temperature shall be -40° C. Prior to,
during and following the test, the equipment shall meet the requirements of 3.6.1.1.
4.7.1.2 High. The equipment shall be tested in accordance with method 501, procedure I of MIL-STD-810. The
storage temperature shall be 70° C, maintained for 2 hours and the operating temperature shall be 65° C. Prior to,
during and following the test, the equipment shall meet the requirements of 3.6.1.2.
4.7.2 Humidity. The equipment shall be tested in accordance with method 507, procedure I of MIL-STD-810, with
measurements made during the last 5 hour period of each cycle. Prior to, during and following the test, the
equipment shall meet the requirements of 3.6.2.
4.7.3 Altitude. The equipment shall be tested in accordance with method 500, procedure I of MIL-STD-810. Prior
to, during and following the test, the equipment shall meet the requirements of 3.6.3.
4.7.4 Leakage (immersion). The equipment shall be tested in accordance with method 512, procedure 1 of
MIL-STD-810 and meet the requirements of 3.6.4 prior to and following the test.
4.7.5 Blast. Mount the handset under test on the carriage of the Simulated Gun Blast Producing Equipment in
accordance with SK-N-864 with the front edge of the earphone element in the test plane and with its axis coincident
with that of the explosion chamber. Subject the handset to 30 rounds of blast at peak pressure of 9.5 psi. Determine
compliance with 3.6.5.
4.7.6 Vibration. The equipment shall be tested in accordance with method 201 of MIL-STD-202.
Determine compliance with 3.6.6.
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