MIL-PRF-27208F
NATIONAL CONFERENCE OF STANDARDS LABORATORIES
- Calibration Laboratory and Measuring and Test Equipment, General Requirements for.
(Copies of this document are available from https://www.ncsli.org/ or from the National Conference of Standards
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Laboratories (NCSL) International, 1800 30 Street, Suite 305, Boulder, CO 80301-1026.)
2.4 Order of precedence. In the event of a conflict between the text of this document, and the references cited
herein (except for associated specifications, specification sheets, or MS 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 Associated specifications. The individual part requirements shall be as specified herein and in accordance
with the applicable associated specifications. In the event of a conflict between requirements of this specification and
the associated specifications, the latter shall govern (see 6.2).
3.2 Qualification. Resistors furnished under this specification shall be products that are qualified for listing on the
3.3 Materials. Materials shall be as specified herein. However, when a definite material is not specified, a material
shall be used which will enable the resistors 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 Plastic. Plastic laminates containing a cotton fabric base or plastic molding compounds containing cotton or
wood flour filler shall not be used. When not machined, the plastic materials shall have smooth or polished surfaces.
Surfaces that have not been sawed, cut, punched, or otherwise machined shall be smooth as practicable in
accordance with good manufacturing practice.
3.3.2 Ferrous metals. Unless specifically approved by the Government, the use of ferrous material, with the
exception of corrosion resistance element material is prohibited.
3.4 Interface and physical dimensions. The resistors shall meet the interface and physical dimensions specified
(see 3.1).
3.4.1 Windings. The resistance element shall be wound on a form that shall not char or break down as a result of
the tests specified herein. The element shall be a continuous unbroken length of conductor without joints, or welds,
except at the junction of the resistor element and winding terminals. The wire shall possess a uniform cross-sectional
area and in no case shall the absolute minimum diameter be less than 0.0008 inch, unless otherwise specified (see
3.1).
3.4.2 Protective housing and enclosure. The resistance element of completed resistors shall be protected by a
housing, or an enclosure, or both, which shall completely cover the exterior of the resistance element. The protective
housing or enclosure shall be free from holes, fissures, chips, or other faults, and shall be such as to minimize the
establishment of leakage paths between terminals, resulting from collection of moisture film on the exterior surface of
the housing or enclosure. If the housing is made from aluminum alloy, it shall be properly protected against corrosion
and all fasteners shall be plated. Unplated copper alloy metals shall not be used in contact with aluminum.
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