MIL-DTL-9415B
4.5.2.2.5 Input-output characteristics. Measurements shall be made under the conditions in table X (see 3.5.1.4).
4.5.2.2.6 Amplifier output with ON-OFF switch in OFF position. With the ON-OFF switch in the OFF position and
the call circuit of the amplifier un-energized, an input signal of 4.4 volts and 1,000-Hz signal shall be applied.
Measure the output in volts (see 3.5.3).
4.5.2.2.7 Noise in output due to ripple on dc line. The following conditions shall be applied: (see 3.5.4).
a. The dc power line shall be 27.5 volts dc.
b. 1.5 volts (rms) ripple at 400 Hz to be applied to the power line.
c. No input signal to be applied.
d. Measure the output in volts.
4.5.2.2.8 Phasing. Phasing shall be checked under the conditions indicated herein (see 3.5.5).
4.5.2.2.9 Microphonic noise. This measurement shall be made under the conditions indicated herein (see 3.5.6).
4.5.2.3 Complete Assembly.
4.5.2.3.1 Stray magnetic field. The stray magnetic field of the complete assembly shall be determined as follows,
by using the Keuffel and Easer type No. 5600 compass or its approved equivalent. The magnet structure of the
complete assembly shall be placed with the geometric center of the magnet structure 18 inches (457.2 mm) from the
pivot point of the compass needle and on the perpendicular bisector of the needle in the plane of rotation of the
needle. The magnetic structure of the complete assembly shall be oriented in all directions and the maximum
deflection of the compass observed. This test shall be made in a location substantially free from stray magnetic
disturbances (see 3.4.2.1.1).
4.5.2.3.2 Overall performance. With Dynamic Loudspeaker LS-184A/AIC-10 connected as shown on figure 6, and
with a 4-volt (rms) input signal, the acoustic output of the complete assembly shall be listened to for buzzes, rattles,
or other spurious sounds over the frequency range of 200 Hz to 10,000 Hz. The approximate acoustic output over
this frequency range shall be measured in a free field at a point on the principal axis 3 feet away from the complete
assembly (see 3.4.2.3.10).
4.5.3.1 Loudspeaker lead wire flexibility. The loudspeaker lead wires enclosed in the insulating tubing shall be
aged in a test chamber having an internal temperature of + 85 degrees C (+ 185 degrees F) for a period of 7 days, at
the conclusion of which, the lead wires, tubing, and a .25 inch (6.35 mm) diameter test mandrel shall be immediately
placed in another test chamber wherein a temperature of - 55 degrees C (- 67 degrees F) is maintained and shall be
kept therein for 2 hours. Before being removed from the - 55 degrees C test chamber, the tubing with the lead wires
enclosed shall be wrapped five times around the mandrel which is also at - 55 degrees C, and then unwrapped. The
wires and tubing shall be examined for any evidence of damage to the insulation, such as splits or ruptures, and other
mechanical impairment (see 3.4.1.2).
4.5.3.2 Lead wire clamp efficiency. A pull of 5 pounds shall be applied to the loudspeaker lead wires in the
direction of the clamp axis for at least 20 seconds (see 3.4.1.4).
4.5.3.3 Disengagement force of loudspeaker connector. This measurement shall be made under the conditions
indicated herein (see 3.4.1.6.3).
4.5.3.4 Connector life test. This test shall be performed under the conditions indicated herein (see 3.4.1.6.4).
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