MIL-DTL-24223D(SH)
4.5.14 Stray magnetic field test. If required (see 3.23) in the specification sheet, the loudspeaker shall be
placed in the normal mounting position with the magnet axis horizontal. The stray magnetic field produced by the
loudspeaker shall be measured in a horizontal plane 21/2 feet below the center of the loudspeaker magnet. The
measuring probe shall be oriented to measure the vertical component of the magnetic field. Sufficient measurements
shall be taken to determine the peak value of stray field in the horizontal plane. The test shall then be repeated once
with the loudspeaker tilted forward 10 degrees (magnet axis 10 degrees below horizontal) and once with the
loudspeaker tilted 10 degrees to the rear (magnet axis 10 degrees above horizontal). The permeability of material
after fabrication shall be determined by placing the indicator (inserted with a 2.0 slug) in contact with each part of
the loudspeaker required to be non-magnetic.
4.5.15 Gun blast test. If required in the specification sheet, the loudspeaker shall be mounted on the carriage of
the U.S. Navy simulated Gun Blast Equipment located at Naval Electronics Laboratory Center, San Diego,
California (or an equivalent equipment). The front edge of the loudspeaker shall be positioned in the test plane, and
the axis shall be coincident with that of the explosion chamber. The loudspeaker being tested shall be subjected to
30 rounds of blast at a peak pressure of 9.5 pounds per square inch. For high power loudspeakers, where the mouth
area exceeds the face area of the explosion chamber, the loudspeaker shall be so positioned that the axis of one of
the individual horns is coincident with that of the explosion chamber. After being subjected to the gun blast test, the
loudspeaker shall conform to the requirements of 3.22.
4.5.16 Jet blast test. If required by the specification sheets, the loudspeaker shall meet the performance
requirements of 3.22 after undergoing five cycles of the following procedure: The loudspeaker shall be placed in an
environment of 212 °F (100 °C) for 2 hours, then brought to a surface temperature of 347 °F (175 °C) within 2
minutes, remaining at 347 °F (175 °C) for 2 minutes, then returning to a room temperature environment within 10
minutes. The loudspeaker shall remain at room temperature for 1 hour.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these
personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging
requirements are maintained by the Inventory Control Point s packaging activities within the Military Service or
Defense Agency, or within the military service s system commands. Packaging data retrieval is available from the
managing Military Department s or Defense Agency s automated packaging files, CD-ROM products, or by
contacting the responsible packaging activity.
6. NOTES
(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)
6.1 Intended use. The loudspeakers designed and produced to this specification are intended to be used in all
applications of announcing systems for Naval ships. There are different types of loudspeakers specified, based on
their intended use on Naval platforms, that include exterior unsheltered environments, interior sheltered
environments, explosive environments that require low magnetic signatures, and flight deck announcing.
6.2 Acquisition requirements. Acquisition documents should specify the following:
a.
Title, number, and date of this specification.
b.
Type required (see specification sheet).
c.
Quantity of items required.
d.
When first article testing is required (see 3.2).
e.
Inventory Control Point for repair parts.
f.
Quantity of repair parts.
g.
Packaging requirements (see 5.1).
h.
Paint color (unless haze gray is acceptable).
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