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ASTM B84-07(2019)

(Test Method)

Standard Test Method for Temperature-Resistance Constants of Alloy Wires for Precision Resistors

Standard Test Method for Temperature-Resistance Constants of Alloy Wires for Precision Resistors

SIGNIFICANCE AND USE
2.1 Procedure A covers the determination of the equation of the curve relating resistance and temperature where the curve approximates a parabola. This test method may be used for wire of any metal or alloy over the temperature interval appropriate to the material.  
2.2 Procedure B covers the determination of the mean temperature coefficient of resistance for wire of any metal or alloy over the temperature interval appropriate to the material.
SCOPE
1.1 This test method covers determination of the change of resistance with temperature of alloy wires used for resistance standards and precision resistors for electrical apparatus.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-Mar-2019
ICS
29.050 - Superconductivity and conducting materials
Technical Committee
B02 - Nonferrous Metals and Alloys
Drafting Committee
B02.10 - Thermostat Metals and Electrical Resistance Heating Materials
Current Stage
Ref Project

Relations

Referred By
ASTM B267-07(2018) - Standard Specification for Wire for Use In Wire-Wound Resistors
Effective Date
01-Apr-2019
Referred By
ASTM B114-07(2018) - Standard Test Method for Temperature-Resistance Constants of Sheet Materials for Shunts and Precision Resistors
Effective Date
01-Apr-2019
Referred By
ASTM B1015-20 - Standard Practice for Form and Style of Standards Relating to Refined Nickel and Cobalt and Their Alloys
Effective Date
01-Apr-2019

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ASTM B84-07(2019) - Standard Test Method for Temperature-Resistance Constants of Alloy Wires for Precision ResistorsASTM B84-07(2019) - Standard Test Method for Temperature-Resistance Constants of Alloy Wires for Precision Resistors
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ASTM B84-07(2019) - Standard Test Method for Temperature-Resistance Constants of Alloy Wires for Precision Resistors
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This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: B84 − 07 (Reapproved 2019)
Standard Test Method for
Temperature-Resistance Constants of Alloy Wires for
1
Precision Resistors
ThisstandardisissuedunderthefixeddesignationB84;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginal
adoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope the baths; and suitable means for measuring the resistance of
the specimen. Details of the apparatus are given in Sections 4
1.1 This test method covers determination of the change of
to 6.
resistance with temperature of alloy wires used for resistance
standards and precision resistors for electrical apparatus.
4. Baths
1.2 The values stated in SI units are to be regarded as
4.1 Baths for use from −65 to +15°C may consist of toluol,
standard. No other units of measurement are included in this
or equivalent.
standard.
4.2 Baths for use above 15 to 250°C may consist of
1.3 This standard does not purport to address all of the
chemically neutral oils with a low viscosity, having a flash
safety concerns, if any, associated with its use. It is the
point at least 50°C higher than the temperature of use.
responsibility of the user of this standard to establish appro-
4.3 Theliquidinthesebathsshallbeofsuchquantityandso
priate safety, health, and environmental practices and deter-
well stirred that the temperature in the region occupied by the
mine the applicability of regulatory limitations prior to use.
specimen and the thermometer will be uniform within 0.5°C
1.4 This international standard was developed in accor-
for any temperature between −65 and +100°C, and within
dance with internationally recognized principles on standard-
1.0°C for any temperature above 100 to 250°C. If the
ization established in the Decision on Principles for the
temperature range is less than 100°C, the uniformity of
Development of International Standards, Guides and Recom-
temperature shall be proportionately closer.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. NOTE 1—It is recommended that a solvent bath at room temperature
shall be used to rinse specimens before immersion in any temperature
bath.
2. Significance and Use
2.1 ProcedureAcovers the determination of the equation of 5. Temperature Measurement Apparatus
the curve relating resistance and temperature where the curve
5.1 The temperature shall be measured to an accuracy of
approximates a parabola. This test method may be used for
60.5°C, or 1% of temperature range, whichever is smaller.
wire of any metal or alloy over the temperature interval
appropriate to the material.
6. Resistance Measurement Apparatus
2.2 Procedure B covers the determination of the mean 6.1 The change of resistance of the specimen shall be
temperature coefficient of resistance for wire of any metal or
measuredbyapparatuscapableofdeterminingsuchchangesto
alloy over the temperature interval appropriate to the material. 0.001% of the resistance of the specimen if the temperature
range is 50°C or more. If the temperature range is less than
3. Apparatus 50°C, the accuracy of the resistance change measurements
shall be correspondingly greater.
3.1 The apparatus for making the test shall consist of one or
6.2 The connections from the specimen to the measuring
more baths for maintaining the specimen at the desired
temperatures; thermometers for measuring the temperatures of device shall be such that changes in the resistance of these
connections due to changes in their temperature do not
appreciably affect the measurement of the change in resistance
of the specimen.
1
This test method is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
6.3 The temperature of the measuring apparatus shall not
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
change during the test by an amount sufficient to introduce
Current edition approved April 1, 2019. Published April 2019. Originally
appreciable errors in the results. With apparatus of good
approvedin1931.Lastpreviouseditionapprovedin2013asB84–07(2013).DOI:
10.1520/B0084-07R19. quality, a change in 1°C in room temperature is allowable.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B84 − 07 (2019)
6.4 The test current shall not be of such a magnitude as to soldered, or welded to each end of the specimen for use as
produceanappreciablecha
...

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