MIL-DTL-438C
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.
ASTM INTERNATIONAL
ASTM-B684
Platinum Iridium Electrical Contact Material
(Copies of these documents are available online at https://www.astm.org or from the ASTM International,
P.O. Box C700, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.)
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)
ISO 10012-1
-
Equipment, Quality Assurance Requirements for Measuring - Part 1
Metrological Confirmation System for Measuring Equipment
(Copies of this document are available from https://www.iso.ch or from International Organization for
nd
th
Standardization American National Standards Institute, 11 West 42 Street, 13 Floor, New York,
NY10036.)
NCSL INTERNATIONAL
NCSL Z540.3
-
General Requirements for Calibration of Measuring and Test
Equipment
(Copies of this document are available online at https://www.ncsli.org or from NCSL International 2995
Wilderness Place, Suite 107 Boulder, Colorado 80301-5404.)
2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein, 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 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in
accordance with 4.2.
3.2 Material. The wire shall be an alloy of 90% platinum and 10% iridium as specified in ASTM-B684.
3.3 Diameter. The diameter of the wire shall be 0.002 ± 0.0005 inches (.051 +.0127mm).
3.4 Breaking strength. The wire shall be capable of withstanding a force of at least 6 ounces without
breaking when pulled at a rate of 12 inches per minute.
3.5 Electrical resistance. The wire shall have an electrical resistance ranging from 28 to 31Ω per foot at
20 șC.
3.6 Workmanship. Wire furnished under this specification shall be manufactured in a thoroughly
workmanlike manner. All material shall be sound, of uniform quality and condition, and free of cracks and
other defects which may adversely affect its serviceability.
3.7 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.
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