ASTM B Standard Specification for Wire for Use In Wire-Wound Resistors. ASTM-B – Download as PDF File .pdf), Text File .txt) or read online. Non Ferrous Standard. This specification covers round wires and ribbons with controlled electrical properties made from magnetic and nonmagnetic class 1a alloys.
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No further reproductions authorized. The electrical resistance per unit length can be determined more accurately than the dimensions of very small wire. C The maximum temperature values listed apply to the alloy wire only.
ASTM B267 – 07(2018), Standard Specification for Wire for Use In Wire-Wound Resistors
To convert from pounds to kilograms multiply by 0. Originally approved in The nominal resistance per unit length for a round wire is calculated from the nominal resistivity and nominal cross-sectional area. A number in parentheses indicates the year of last reapproval. It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application.
The test shall be made 2 to 10 min after removal of the wire from the oil, lightly wiping off the excess oil. It shall be free from voids or bare spots and have a minimum of back twist.
Link to Active This link will always route to the current Active version of the standard. All alloys covered by these speci?
Values shown for other classes are for information only. B2677 of the information included in this note is based on measurements made in accordance with Test Method B The covering shall be sufficiently closely wrapped so that, when the wire is bent around a mandrel having a diameter ten times the overall diameter of the covered wire, using only enough tension to give an even compact layer, the wrappings will not open enough to make the wire underneath visible to the unaided eye.
Last previous edition approved in as B — 90 B Alloy Classes 1a, 1b, 1c, 2a, 2b, 3a, 4, and 6 are designed to give a low emf versus copper. Maximum indicates the maximum deviation from zero and the plus or minus sign the polarity of the couple. Wire larger in diameter than sizes listed in Table 6 may be supplied on spools Table 7 or in coils depending on agreement between the manufacturer and the purchaser. Historical Version s – view previous versions of standard.
The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. The surface of the coating shall be smooth and uniform.
It is the responsibility of the user of this standard to become familiar with all hazards including those identi? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Ribbon actually is made to a speci? If you feel that your comments have not received a fair hearing you should make your views known to b2667 ASTM Committee on Standards, at the address shown below.
ASTM B Standard Specification for Wire for Use In Wire-Wound Resistors_百度文库
The wires and ribbons, which may have insulated coverings or enamel coatings, are recommended for use in wire-wound resistance units like precision resistors and other similar applications, but not for use as electrical heating elements.
This specification covers round wires and ribbons with controlled electrical properties made from magnetic and nonmagnetic class 1a alloys.
It shall include both single and double coverings. Your comments will receive careful satm at a meeting of the responsible technical committee, which you may attend.
The enamel shall not be underbaked so that one turn adheres to the next on a spool. This slope is determined from the following equation: Temperature Coefficient of Resistance 8.
ASTM-B | Standard Specification for Wire for Use In Wire-Wound Resistors | Document Center, Inc.
Alloy Class 1 3 4 5 6 Color purple yellow red pink ivory D in Diameter in. Caution should be exercised pending knowledge of the maximum temperature of use for the coating material involved. Permissible Variations in Dimensions This is not valid in view of modern rolling equipment and practices, but still is widely used as a basis of description.
NOTE 1—When ribbon or?