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ASTM B84-07

(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
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.
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.
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 become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices, and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Apr-2007
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

Replaces
ASTM B84-90(2001) - Standard Test Method for Temperature-Resistance Constants of Alloy Wires for Precision Resistors
Effective Date
01-May-2007
Replaced By
ASTM B84-07(2013) - Standard Test Method for Temperature-Resistance Constants of Alloy Wires for Precision Resistors
Effective Date
01-May-2013
Referred By
ASTM B267-07(2018) - Standard Specification for Wire for Use In Wire-Wound Resistors
Effective Date
01-May-2007
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-May-2007
Referred By
ASTM B114-07(2018) - Standard Test Method for Temperature-Resistance Constants of Sheet Materials for Shunts and Precision Resistors
Effective Date
01-May-2007

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ASTM B84-07 - Standard Test Method for Temperature-Resistance Constants of Alloy Wires for Precision ResistorsASTM B84-07 - Standard Test Method for Temperature-Resistance Constants of Alloy Wires for Precision Resistors
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ASTM B84-07 - Standard Test Method for Temperature-Resistance Constants of Alloy Wires for Precision Resistors
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: B84 − 07
StandardTest 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 4. Baths
4.1 Baths for use from −65 to +15°C may consist of toluol,
1.1 This test method covers determination of the change of
or equivalent.
resistance with temperature of alloy wires used for resistance
standards and precision resistors for electrical apparatus.
4.2 Baths for use above 15 to 250°C may consist of
chemically neutral oils with a low viscosity, having a flash
1.2 The values stated in SI units are to be regarded as
point at least 50°C higher than the temperature of use.
standard. No other units of measurement are included in this
standard.
4.3 Theliquidinthesebathsshallbeofsuchquantityandso
well stirred that the temperature in the region occupied by the
1.3 This standard does not purport to address all of the
specimen and the thermometer will be uniform within 0.5°C
safety concerns, if any, associated with its use. It is the
for any temperature between − 65 and +100°C, and within
responsibility of the user of this standard to become familiar
1.0°C for any temperature above 100 to 250°C. If the tempera-
with all hazards including those identified in the appropriate
ture range is less than 100°C, the uniformity of temperature
Material Safety Data Sheet (MSDS) for this product/material
shall be proportionately closer.
as provided by the manufacturer, to establish appropriate
safety and health practices, and determine the applicability of
NOTE 1—It is recommended that a solvent bath at room temperature
regulatory limitations prior to use.
shall be used to rinse specimens before immersion in any temperature
bath.
2. Significance and Use
5. Temperature Measurement Apparatus
2.1 ProcedureAcovers the determination of the equation of
5.1 The temperature shall be measured to an accuracy of
the curve relating resistance and temperature where the curve
60.5°C, or 1% of temperature range, whichever is smaller.
approximates a parabola. This test method may be used for
6. Resistance Measurement Apparatus
wire of any metal or alloy over the temperature interval
appropriate to the material.
6.1 The change of resistance of the specimen shall be
measuredbyapparatuscapableofdeterminingsuchchangesto
2.2 Procedure B covers the determination of the mean
0.001% of the resistance of the specimen if the temperature
temperature coefficient of resistance for wire of any metal or
range is 50°C or more. If the temperature range is less than
alloy over the temperature interval appropriate to the material.
50°C, the accuracy of the resistance change measurements
shall be correspondingly greater.
3. Apparatus
6.2 The connections from the specimen to the measuring
3.1 The apparatus for making the test shall consist of one or
device shall be such that changes in the resistance of these
more baths for maintaining the specimen at the desired
connections due to changes in their temperature do not
temperatures; thermometers for measuring the temperatures of
appreciably affect the measurement of the change in resistance
the baths; and suitable means for measuring the resistance of
of the specimen.
the specimen. Details of the apparatus are given in Sections 4
to 6. 6.3 The temperature of the measuring apparatus shall not
change during the test by an amount sufficient to introduce
appreciable errors in the results. With apparatus of good
quality, a change in 1°C in room temperature is allowable.
1
This test method is under the jurisdiction of ASTM Committee B02 on
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
6.4 The test current shall not be of such a magnitude as to
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
produceanappreciablechangeinresistanceofthespecimenor
Current edition approved May 1, 2007. Published June 2007. Originally
measuring apparatus due to the heating effect. To determine
approvedin1931.Lastpreviouseditionapprovedin2001asB84–90(2001).DOI:
10.1520/B0084-07. experimentally that the test current is not too large, the
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
B84−07
specimen may be immersed in a bath having a temperature at 9.3 In coils made of fine wire where there is not sufficient
which it has been found that the wire has a relatively large rigidityinthecoilitselftofurnishasatisfactorysupportforthe
change in resistance with temper
...

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