ASTM B114-07
(Test Method)Standard Test Method for Temperature-Resistance Constants of Sheet Materials for Shunts and Precision Resistors
Standard Test Method for Temperature-Resistance Constants of Sheet Materials for Shunts and Precision Resistors
SIGNIFICANCE AND USE
This test method covers the determination of the change of resistance with temperature for precision resistors and shunts made from sheet materials.
Materials normally used in the temperature range from 0 to 80°C may be tested using this test method.
SCOPE
1.1 This test method covers the determination of the change of resistance with temperature of sheet materials used for shunts and precision resistors for electrical apparatus. It is applicable to materials normally used in the temperature range of from 0 to 80°C.
1.2 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units may be approximate.
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.
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Standards Content (Sample)
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Designation: B114 − 07
StandardTest Method for
Temperature-Resistance Constants of Sheet Materials for
1
Shunts and Precision Resistors
This standard is issued under the fixed designation B114; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Test Specimen
1.1 This test method covers the determination of the change 4.1 The test specimen shall be of such dimensions that its
of resistance with temperature of sheet materials used for electrical resistance can be measured to the required accuracy.
shunts and precision resistors for electrical apparatus. It is
NOTE 1—Measurements are simplified if the specimen has a resistance
applicable to materials normally used in the temperature range
of 0.01 Ω or more. The specimen may be bent in the form of a “U” to
of from 0 to 80°C.
facilitate handling.
1.2 The values stated in inch-pound units are to be regarded
5. Terminals
as the standard. The metric equivalents of inch-pound units
may be approximate. 5.1 A current terminal shall be attached to each end of the
specimen. These terminals shall be either soldered or clamped
1.3 This standard does not purport to address all of the
in such a manner that there will be no change of current
safety concerns, if any, associated with its use. It is the
distribution in the specimen during the test.
responsibility of the user of this standard to become familiar
with all hazards including those identified in the appropriate
5.2 Potential terminals, one at each end, shall be located at
Material Safety Data Sheet (MSDS) for this product/material
a distance not less than two times the width of the specimen
as provided by the manufacturer, to establish appropriate
fromthecurrentterminals.Theseterminalsshallbeattachedat
safety and health practices, and determine the applicability of
the center of the width of the specimen either by soldering to
regulatory limitations prior to use.
ears cut out of the specimen (Note 2) as shown in Fig. 1 or by
clamps, each of which presses a single sharp point into the
2. Referenced Documents
material.
2
2.1 ASTM Standards:
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NOTE 2—The ears shall be cut so that they are about ⁄2 in. (12.7 mm)
B84Test Method for Temperature-Resistance Constants of
1
inlengthand ⁄8in.(3.2mm)inwidth.Thecutshallbecleanandfreefrom
Alloy Wires for Precision Resistors
sliversatthejunctionoftheearandthespecimen.Beforecuttingtheears,
it is desirable to drill two small holes with a sharp drill where the ear will
3. Significance and Use
be jointed to the specimen.
3.1 This test method covers the determination of the change
6. Preliminary Treatment for Manganin Samples
of resistance with temperature for precision resistors and
shunts made from sheet materials.
6.1 Inthecaseofmanganinmaterials,afterallthemechani-
cal work has been finished, the specimen shall be given one
3.2 Materialsnormallyusedinthetemperaturerangefrom0
heattreatmentof48hat140 65.0°Candthencooledtoroom
to 80°C may be tested using this test method.
temperature.
6.2 The specimen shall then be given a dip in a nitric acid
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This test method is under the jurisdiction of ASTM Committee B02 on
solution (50%) to remove the copper film (which can be
Nonferrous Metals and Alloys and is the direct responsibility of Subcommittee
B02.10 on Thermostat Metals and Electrical Resistance Heating Materials.
judged by the color of the specimen) and then thoroughly
Current edition approved May 1, 2007. Published June 2007. Originally
scrubbed in running water.
approved in 1938. Last previous edition approved in 2001 as B114–90(2001).
DOI: 10.1520/B0114-07.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 7. Apparatus
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
7.1 Theapparatusformakingthetestshallconsistofoneor
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. more baths for maintaining the specimen at the desired
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B114 − 07
appreciable errors in the results. With apparatus of good
quality, a change of 1°C in its temperature is allowable.
10.3 The test current shall not be of such a magnitude as to
produceanappreciablechangeinresistanceofthespecimenor
measuring apparatus due to the heating effect. The dimensions
of the specimen should be such that the power dissipated shall
2 2
not exceed 0.02 W/in. (0.003 W/cm ) of exposed surface. To
determine experimentally that the test current is not too large
...
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