MIL-PRF-15305F
4.
VERIFICATION
4.1 Classification of inspections. The examination and testing of transformers and inductors shall be classified as
follows:
Qualification inspection (see 4.4).
a.
b.
Conformance inspection (see 4.5).
4.2 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 inspection facility. The establishment and maintenance of a calibration system to control accuracy of the
measuring and test equipment shall be in accordance with NCSL Z540.3, ISO 10012 or equivalent.
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 voltage. The test voltage shall contain no more than 5 percent harmonic distortion.
4.3.2 Test frequency. When a test frequency is specified without a tolerance, the frequency used shall be
within ±0.1 percent of the specified value.
4.3.3 Demagnification. When necessary to overcome remanence effects, demagnification is permitted.
4.4 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.
4.4.1 Sample size. The number of sample coils to be subjected to qualification inspection shall be as specified in
the appendix to this specification, and table IV.
4.4.2 Inspection routine. Sample units shall be subjected to the qualification inspection specified in table IV, in the
order shown. All sample units shall be subjected to the inspection of group I except those units of group V and VI. The
sample units shall then be divided as specified in table IV for groups II to IV inclusive, and the sample units subjected
to the inspection for their particular group. Additional units shall be required for groups V and VI tests.
4.4.2.1 Comparison standards. When the use of comparison standards is specified (see 3.1), three sample units
nearest to the design-center values of the electrical characteristics (see 4.6.5) will be selected from those sample units
which have been subjected to the inspection of group I of table IV, and clearly and permanently marked with these
values. Two of the sample units selected will be retained by the Government as standards. The remaining sample units
will be returned to the contractor for use as a comparison standard (see 6.4) for correlation of measurements in the
electrical characteristics quality conformance inspection specified (see 3.1).
4.4.3 Failures. One or more failures shall be cause for refusal to grant qualification approval.
4.4.4 Retention of qualification. To retain qualification, every 12 months, the manufacturer shall verify to the
qualifying activity the following.
a.
Design of the coils have not changed.
b.
Verification that group A and group B inspections have been performed on inspection lots supplied to the
requirements of this specification.
c.
The manufacturer retains the capability to manufacturer and test coils to this specification.
In the event that no production has occurred in this period, the manufacturer shall verify to the qualifying activity that
capability to manufacture and test the Qualified Products List (QPL) coil still exists and that the manufacturer wants to
remain on the QPL.
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