MIL-DTL-12606E
4.4 Inspection conditions and preconditioning.
4.4.1 Conditions. Unless otherwise specified herein, all inspection shall be performed in accordance with the test conditions specified
in the "GENERAL REQUIREMENTS" of MIL-STD-202. All acoustical testing shall be made in an acoustic chamber, which is equivalent
to the free field acoustic environment per IEEE Standard 219.
4.4.2 Bounce preconditioning. The loudspeaker shall be placed in any convenient position on the table of a package tester as made
by the L.A.B. Corporation, Skaneateles, New York (or equal). The package tester, shafts in phase, shall have a speed so that it is just
possible to insert a 1/32-inch thick strip of material under one corner or edge of the loudspeaker to a distance of 3 inches as the
loudspeaker bounces. The loudspeaker shall be subjected to 1 minute of this bounce preconditioning. After the bounce preconditioning,
the loudspeaker shall not be repaired, adjusted, cleaned, or otherwise changed prior to the qualification or quality conformance inspection.
4.5 Qualification inspection. Qualification inspection shall be performed at a laboratory acceptable to the Government (see 6.3) on
sample units produced with equipment and procedures normally used in production.
4.5.1 Sample size. Six loudspeakers shall be subjected to qualification inspection.
4.5.2 Inspection routine. The sample shall be subjected to the inspection specified in table II, in the order shown. All sample units
shall be subjected to the inspections of group I. The sample shall then be divided equally into two groups of 3 units each and subjected
to the inspections for their particular group.
TABLE II. Qualification inspection.
Inspection
Requirement
Method
paragraph
paragraph
Group I
Visual and mechanical examination
3.2, 3.3, 3.5, and
4.7.1
3.6
Voice coil polarity
3.4.1
4.7.2
Voice coil impedance
4.7.3
3.4.2
Dielectric withstanding voltage
4.7.4
3.4.3
Acoustic quality
4.7.5
3.4.4
Frequency response
4.7.6
3.4.5
Harmonic distortion
4.7.7
3.4.6
Group II
4.7.8
Immersion resistance
3.4.7
4.7.9
Endurance
3.4.8
Group III
4.7.10
Cold resistance
3.4.9
4.7.11
Heat resistance
3.4.10
4.7.12
Moisture resistance
3.4.11
4.7.13
Bounce
3.4.12
4.7.14
Shock
3.4.13
4.5.3 Failure. One or more failures shall be cause for refusal to grant qualification approval.
4.5.4 Disposition of sample units. Sample units which have been subjected to qualification inspection shall not be delivered on the
contract or order.
4.5.5 Verification of qualification. To retain qualification, the contractor shall forward a report at 12-month intervals to the qualifying
activity. The qualifying activity shall establish the initial report date. The report shall consist of:
a. A summary of the results of the tests performed for inspection of product for delivery group A and B, indicating as a
minimum the number of lots that have passed and the number that have failed. The results of tests of all reworked lots
shall be identified and accounted for.
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