MIL-DTL-15370J
3.21.3 Serialization. Each directional coupler shall be marked with a unique serial number assigned consecutively
within the inspection lot allowing traceability of the directional coupler.
3.21.4 Laser marking. Laser marking is permitted, provided it meets the requirements of this specification.
3.22 Workmanship. Directional couplers shall be manufactured and processed in a careful and workmanlike
manner. (MIL-HDBK-454, guideline 9 may be used for guidance.)
3.23 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally
preferable materials should be used to the maximum extent possible, provided that the material meets or exceeds the
operational and maintenance requirements, and promotes economically advantageous life cycle costs.
4. VERIFICATION
4.1 Classification of inspections. The inspections specified herein are classified as follows:
a.
First article inspection (see 4.6).
Conformance inspection (see 4.7).
b.
4.2 Materials inspection. Materials inspection shall consist of certification supported by verifying data that the
materials listed in table I, used in fabricating the directional coupler, are in accordance with the applicable referenced
specifications or requirements prior to such fabrication.
4.3 Inspection conditions. Unless otherwise specified herein, all inspections shall be performed in accordance with
the test conditions specified in the "GENERAL REQUIREMENTS" of MIL-STD-202.
4.3.1 Test method variation. Variation from the specified test methods used to verify the electrical parameters are
allowed provided that it is demonstrated to the preparing activity or to their agent that such variations in no way relax
the requirements of this specification and that they are approved before testing is performed. For proposed test
variations, a test method comparative error analysis shall be made available for checking by the preparing activity or
by their agent.
4.3.2 Test equipment and inspection facilities. Test and measuring equipment and inspection facilities of sufficient
accuracy, quality, and quantity to permit performance of the required inspection shall be established and maintained
by the supplier. The establishment and maintenance of a calibration system to control the accuracy of the measuring
4.3.3 Accuracy of test equipment. The frequency-measuring device used shall have an accuracy of ± 0.1 percent
or better. The overall accuracy in the determination of VSWR shall be better than ± 2 percent. The coupling-
measuring system used shall have an accuracy of ± 0.1 dB up to 10 dB and ± 0.1 dB per 10 dB above 10 dB or
better.
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