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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NOTE 1—When ribbon or? Current edition approved May 1, Temperature Coefficient of Resistance 8.
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Nominal Electrical Resistance per Unit Length 7.
Permissible Variations in Dimensions Permissible Variations in Electrical Resistance The values given in parentheses are mathematical conversions to SI units that atsm provided for information only and are not considered standard.
Wire larger in diameter than sizes listed in Table 6 may be supplied on spools Table 7 asfm in coils depending on agreement between the manufacturer and the purchaser.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
B — 07 Standard Speci? Caution should be exercised pending knowledge of the maximum temperature of use for the coating material involved. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
It shall include both single and double coverings. It shall be free from voids or bare spots b276 have a minimum of back twist. No further reproductions authorized. The test shall be made 2 to 10 min after removal of the wire from the oil, lightly wiping off the excess oil.
The surface of the coating shall be smooth and uniform.
B — 07 ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. The mean temperature coefficient of resistance referred to Copyright? Maximum indicates the maximum deviation from zero and the plus or minus sign the polarity of the couple.
ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. This is not valid in view of modern rolling equipment and practices, but still is widely used as a basis of description.
Values shown for other classes are for information only. The enamel shall not be underbaked so that one turn adheres to the next on a spool. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
A number in parentheses indicates the year of last reapproval. Last previous edition approved in as B — 90 All alloys covered by these speci?
The electrical resistance per unit length can be determined awtm accurately than the dimensions of very small wire. 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.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. C The maximum temperature values listed apply to the alloy wire only. Outside Diameter, max, in. Users of this standard are expressly advised that determination of the astn of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
ASTM B Standard Specification for Wire for Use In Wire-Wound Resistors_百度文库
The second covering shall be wrapped in the opposite direction from the? Historical Version s – view previous versions of standard. Each bare wire should conform to the requirements for nominal resistivity, elongation, thermal electromotive force with respect sstm copper, and the temperature coefficient of resistance contained in this specification. Link to Active This link will always route to the current Active version of the standard.
ASTM B267 – 07(2018), Standard Specification for Wire for Use In Wire-Wound Resistors
All of the information included in this note is based on measurements made in accordance with Test Method B This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The nominal resistance per unit length for a round wire is calculated from the nominal resistivity and nominal cross-sectional area. The tension on the wire shall not exceed one half of its yield strength.
This slope is determined from the following equation: It is informational only and not an official part of the standard; the b2667 text of the standard itself must be referred to for its use and application. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. It is the responsibility of the user of this standard to become familiar with all hazards including those identi? Originally approved in This abstract is a brief summary of the referenced standard.
ASTM B – 07() Standard Specification for Wire for Use In Wire-Wound Resistors
Ribbon actually is made to a speci? The covering shall be sufficiently closely wrapped so that, when the wire is bent around a mandrel having a b27 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.
D If metric sizes are desired, 1 in. Alloy Class 1 3 4 5 6 Color purple yellow red pink ivory To convert from pounds to kilograms multiply by 0.