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For group A conformance inspection |
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|  MIL-C-18312F
The dissipation factor of each sample shall be measured as specified in 4.7.5 at the high test temperature after 24
hours, but not more than 48 hours from the start of the life test, and also at any time during the last 48 hours of the
life test. During these measurements, the dc voltage shall be removed from the capacitor terminals. After the
conditioning, capacitors shall be returned to standard test conditions, and capacitance, dissipation factor, and
insulation resistance shall be measured as specified in 4.7.4, 4.7.5, and 4.7.6, respectively.
4.7.16.2 For group A conformance inspection. Capacitors shall be tested under the same conditions as specified
in 4.7.16.1 except that test duration shall be 250 hours.
4.7.16.3 For group B extended life. Every 2 months, capacitors that have completed the group A test shall be
extended for an additional 750 hours under the same conditions.
4.7.17 Flashpoint of impregnant (see 3.20). The flashpoint of impregnant shall be measured as specified in
ASTM-D92, except that fire point and precision do not apply. The word "impregnant" shall be substituted for the
word "oil" throughout the test method.
5. PACKAGING
5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or
order (see 6.2). When actual packaging of materiel is to be performed by DoD personnel, these personnel need to
contact the responsible packaging activity to ascertain requisite packaging requirements. Packaging requirements
are maintained by the inventory control points packaging activity within the Military Department or Defense Agency,
or within the Military Department's System Command. Packaging data retrieval is available from the managing
Military Departments or Defense Agency's automated packaging files, CD-ROM products, or by contacting the
responsible packaging activity.
6. NOTES
6.1 Intended use. The capacitors covered by this specification are primarily designed for use in power supply filter
circuits, by-pass applications, and other applications where the ac component of voltage is small with respect to the
dc voltage rating. They are military unique due to the fact that they must be able to operate satisfactorily in military
systems under the following demanding conditions: -55C to +85C or +125C operating temperature range, 15 Gs
of vibration, 100 Gs of shock, 48 hours of salt spray, 1,000 hours of use at the maximum temperature and 140% of
rated voltage. In addition these military requirements are verified under a qualification system. Commercial
components are not designed to withstand these military environmental conditions.
6.2 Acquisition requirements. Acquisition documents must specify the following:
a. Title, number, and date of this specification.
b. Issue of DoDISS to be cited in the solicitation, and if required, the specific issue of individual documents
referenced (see 2.2).
c. Packaging requirements (see 5.1).
d. Title, number, and date of the applicable specification sheet, and the complete type designation (see
3.1).
6.3 Qualification. With respect to products requiring qualification, awards will be made only for products which
are, at the time of award of contract, qualified for inclusion in Qualified Products List whether or not such products
have actually been so listed by that date. The attention of the contractors is called to these requirements, and
manufacturers are urged to arrange to have the products that they propose to offer to the Federal Government
tested for qualification in order that they may be eligible to be awarded contracts or orders for the products covered
by this specification. Information pertaining to qualification of products may be obtained from the Defense Supply
Center, Columbus, ATTN: DSCC-VQP, PO Box 3990, Columbus, OH 43216-5000.
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