MIL-PRF-21038F
2.3 Non-Government publications. The following documents form a part of this document to the extent
specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or
contract.
AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI)
ANSI/NCSL Z540-1
-
Calibration Laboratories and Measuring and Test Equipment - General
Requirements.
ISO 10012-1
-
Quality Assurance Requirements for Measuring Equipment -
Part 1:Metrological Confirmation System for Measuring Equipment.
(Copies of these documents are available from www.ansi.org/ or American National Standards Institute (ANSI),
11 West 42nd Street, New York, NY 10036-8002).
2.4 Order of precedence. In the event of a conflict between the text of this document and the references
cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in
this document, however, supersedes applicable laws and regulations unless a specific exemption has been
obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in accordance
with the applicable specification sheet. In the event of any conflict between the requirements of this
specification and the specification sheet, the latter shall govern.
3.2 Qualification. Transformers furnished under this specification shall be products that are manufactured by
a manufacturer authorized by the qualifying activity for listing on the applicable Qualified Products List (QPL)
before contract award (see 4.4 and 6.3).
3.3 Materials. The materials shall be as specified herein. However, when a definite material is not specified,
a material shall be used which will enable the transformers to meet the performance requirements of this
specification. Acceptance or approval of any constituent material shall not be construed as a guaranty of the
acceptance of the finished product.
3.3.1 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.
3.3.2 Flammable materials. Materials used in the construction of transformers shall be nonflammable and
nonexplosive.
3.3.3 Corrosive materials. Corrosive materials used in any of the manufacturing processes shall be removed
or neutralized so that no corrosion will result from such use. Insofar as practicable, materials used in the
construction of transformers shall be noncorrosive.
3.3.4 Solder and soldering flux. Solder and soldering flux shall be of such a quality as to enable the
transformer to meet all the requirements of this specification. Tin plating is prohibited on any internal or external
surface as a final finish (see 6.8). Use of tin-lead (Sn-Pb) finishes are acceptable provided a minimum lead
content is 3 percent by weight.
3.3.5 Magnet wire. Magnet wire shall conform to ANSI/NEMA MW-1000 (see 6.7) or to an approved
equivalent as authorized by the qualifying activity.
3.4 Interface and physical dimensions. Transformers shall meet the interface and physical dimensions
specified (see 3.1).
3.4.1 Solderable terminals. Solderable terminals shall be as specified (see 3.1) and shall meet the
solderability requirements specified herein. (see 3.17).
3.4.2 Case material. Transformers shall be enclosed in a suitable case in order to allow the transformers to
meet the requirements and tests specified herein.
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