MIL-PRF-26H
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 the documents cited in the solicitation or contract (see 6.2).
INTERNATIONAL ORGANIZATION for STANDARDS (ISO)
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Equipment, Quality Assurance Requirements for Measuring - Part 1:
Meteorological Confirmation System for Measuring Equipment.
(Copies of this document are available online at https://www.iso.org/ or should be addressed to the American
National Standards Institute, 11 West 42nd Street New York, NY 10036.)
NATIONAL CONFERENCE OF STANDARDS LABORATORIES (NCSL)
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Laboratories, Calibration, and Measuring and Test Equipment.
(Copies of this document are available from https://www.ncsli.org/ or from the National Conference of Standards
Laboratories (NCSL) International, 1800 30th 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 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 Specifications 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 (see 6.2).
3.2 Qualification. Resistors furnished under this specification shall be from family of products which are qualified
3.3 Material. Materials 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.
3.4 Interface and physical dimension requirement. Resistors shall meet the interface and physical dimensions
specified (see 3.1). The design of the resistors shall be such as to preclude shorting of turns and to obtain a
minimum voltage drop between adjacent turns. Except as required for noninductive performance capability resistors
shall be wound with a single layer of resistance wire. For terminal wire and winding symbol "N" resistors shall be
noninductively wound to minimize inductive effects. The Ayrton-Perry method would be one way of achieving this
requirement.
3.4.1 Protective coating or enclosure. The resistance element of completed resistors shall be protected by a
coating or enclosure which shall completely cover the exterior of the resistance element: Except that resistors wound
with wire of 642 circular mils or over shall have the winding securely anchored by a coating which need not
completely cover the winding. The protective coating shall be free from holes, fissures, chips, and other faults for
units of less than 642 circular mils. The protective coating need not completely cover the junction caused by silver
soldering or welding of the resistance element to the terminals, provided that no portion of any resistance element
wound with wire of 101 circular mils or less is exposed.
3.4.2 Terminals. All terminals shall be solder-coated or otherwise treated to facilitate soldering. When a coating
containing tin is used, the tin content shall range between 40 percent and 70 percent (see 3.9).
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