MIL-DTL-16225C
4.3.3.2 Rejected lots. If an inspection lot is rejected, the contractor may rework it to correct the
defects, or screen out the defective units, and resubmit for re-inspection. If one or more defects are
found in the second sample, the lot shall be rejected and shall not be supplied to this specification.
TABLE IV. Group B tests.
Tests
Requirement
Test
paragraph
paragraph
Frequency range
Power handling
Volume control
Acoustical efficiency
Distortion
4.4 Test procedures.
4.4.1 Test conditions. Unless otherwise specified herein, all measurements and tests shall be made at
room ambient temperature, pressure, and humidity.
4.4.2 Visual, dimensional, and mechanical examination. Loudspeakers shall be examined visually,
dimensionally, and mechanically to determine conformance with this specification.
4.4.3 Electrical tests. Tests shall be conducted to determine conformance with the requirements of
4.4.4 Distortion (see 3.6.6). The distortion test shall be performed on the loudspeaker. A constant
voltage having an r.m.s value to provide rated power at 1,000 Hz shall be applied to the loudspeaker, and
the measurements shall be made at 300 and 5,000 Hz
4.4.5 Acoustical quality (see 3.6.7). The acoustical quality test shall be performed on each
loudspeaker. A constant voltage having an r.m.s value to provide rated power at 1,000 Hz shall be
applied to the 600-ohm input terminals, and the frequency varied continuously from 300 to 5,000 Hz.
4.4.6 Insulation resistance (see 3.6.8). The voice coil shall be disconnected from the circuit before the
insulation resistance of the loudspeaker is measured. The insulation resistance shall be measured
between all circuit conductors and metal parts of the loudspeaker. The insulation resistance shall be
measured with a 500-volt source.
4.4.7 Salt spray test. The loudspeaker shall be subjected to a salt spray test as specified in method
101, condition A of MIL-STD-202. Following this test, the unit shall meet the requirements of 3.3.
4.4.8 Submergence (see 3.8.1). The loudspeaker shall be subjected to the 15-foot 24-hour
submergence test, in accordance with MIL-STD-108.
4.4.9 Shock and vibration (see 3.8.3). The loudspeaker shall be subjected to:
a. The grade A, class I, type A test, while mounted on a adapter in accordance with figure titled
"Large floating shock platform", as specified in MIL-S-901.
b. The type I (Environmental) vibration test as specified in MIL-STD-167-1.
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