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MIL-DTL-21393 Microphone, Dynamic, M21393/1-01, M21393/2-01, And M21393/3-01This specification covers 2 \(two\) hand-held Dynamic Microphones, with or without a self-contained transistor amplifier and different connectors for use in unique military equipment. A wall-mounted holder is also included.

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MIL-DTL-21393B
4.5 Conformance inspection.
4.5.1 Inspection of product for delivery. Inspection of product for delivery shall consist of group A and
group B inspections (see tables III and IV).
4.5.1.1 Inspection lot. An inspection lot shall consist of all products of the same type, produced under
essentially the same conditions, and offered for inspection at one time.
4.5.1.2 Group A inspection. Group A inspection shall consist of 100 percent of each lot. All failures
occurring during testing shall be documented and investigated to determine root cause. If any failures
occur, those defective microphones shall not be supplied to the Government. If more than 10% of the lot
fails, the entire lot shall be rejected and shall not be supplied to this specification (see table III).
TABLE III. Group A inspections.
Examination or test
Requirement paragraph
Method paragraph
Visual and mechanical examination1/
Response measurements
Signal-to-noise ratio2/
1/ For the M21393/3-01 holder, only the visual and mechanical examinations shall be
performed.
2/ The signal-to-noise inspection shall apply only to the M21393/1-01 microphone.
4.5.1.3 Group B inspection (microphone only). Group B inspection shall consist of the inspections
specified in table IV and shall be made on samples, which have been subjected to and have passed
group A inspection.
TABLE IV. Group B inspections.
Examination or test
Requirement paragraph
Method paragraph
Voltage transients
Radio interference control
Distortion
Impact
Temperature cycling1/
Pressure equalization2/
Reliability1/
1/ The reliability test shall be required, only when specified in the contract. When the
reliability test is required, it will replace the temperature cycling test, which shall not be
required. For quantity related to the reliability test, see table VIII.
2/ The pressure equalization inspection shall apply only to the M21393/1-01 microphone.
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