ASTM B84-07 (2019) PDF
Name in English:
St ASTM B84-07 (2019)
Name in Russian:
Ст ASTM B84-07 (2019)
Original standard ASTM B84-07 (2019) in PDF full version. Additional info + preview on request
Full title and description
ASTM B84‑07(2019) — Standard Test Method for Temperature‑Resistance Constants of Alloy Wires for Precision Resistors. Defines procedures for measuring and reporting the change of electrical resistance of alloy wires with temperature, intended for resistance standards and precision resistors used in electrical apparatus.
Abstract
This test method describes two primary procedures for determining temperature‑resistance behavior of alloy wires used in precision resistors: (A) determination of the equation of the resistance‑versus‑temperature curve where the relationship approximates a parabola, and (B) determination of the mean temperature coefficient of resistance over a specified temperature interval. The standard specifies measurement practice, required units (SI), specimen handling, and reporting of results for metrology and quality control applications.
General information
- Status: Withdrawn (superseded by a later edition).
- Publication date: 01‑Apr‑2019.
- Publisher: ASTM International.
- ICS / categories: 29.050 — Superconductivity and conducting materials (conducting materials; resistance and resistive materials test methods).
- Edition / version: ASTM B84‑07(2019) (edition published 2019).
- Number of pages: 5.
Scope
The standard covers procedures to determine how resistance of alloy wire changes with temperature for wires used in resistance standards and precision resistors. It applies to wires of any metal or alloy provided the chosen temperature interval is appropriate for the material. The values are reported in SI units. Safety, environmental, and regulatory practices are left to the user to apply as appropriate.
Key topics and requirements
- Procedure A — determination of the resistance versus temperature curve (parabolic approximation) and extraction of curve coefficients.
- Procedure B — determination of mean temperature coefficient of resistance over a specified temperature interval.
- Specimen preparation and dimensions, and recommendations for handling to avoid measurement bias.
- Temperature control and measurement accuracy requirements (use of calibrated thermometry and stable baths/ovens where applicable).
- Resistance measurement precision, including bridge or comparator techniques and lead‑resistance compensation.
- Calculation methods for temperature coefficients and for fitting a parabolic model where applicable.
- Required units (SI) and reporting format for results, uncertainties, and test conditions.
- Notes on limitations, applicability to different alloy systems, and safety/responsibility clause for users.
Typical use and users
Used by manufacturers of precision resistor wire and precision resistors, metrology and calibration laboratories, quality control departments in electrical component production, research laboratories working with resistive alloys, and standards organizations performing interlaboratory comparisons or establishing reference data for temperature coefficients of resistance.
Related standards
Relevant documents include prior and subsequent editions of ASTM B84 (previously issued editions such as the 2013/2007 revisions and the later 2025 edition that supersedes the 2019 text), and other test and calibration standards covering resistance measurement, temperature measurement and calibration, and material characterization produced by ASTM, ISO and IEC bodies. Users should consult the current edition of related measurement and calibration standards when applying this method.
Keywords
temperature‑resistance, temperature coefficient of resistance, resistor wire, precision resistors, alloy wire, resistance constants, test method, SI units, metrology
FAQ
Q: What is this standard?
A: ASTM B84‑07(2019) is a test method that specifies how to determine the change in electrical resistance of alloy wires with temperature, intended for resistance standards and precision resistors.
Q: What does it cover?
A: It covers two procedures: (A) fitting an equation (commonly a parabolic approximation) to the resistance versus temperature curve, and (B) determining a mean temperature coefficient of resistance over a given temperature interval. It also addresses specimen preparation, measurement accuracy, calculation and reporting.
Q: Who typically uses it?
A: Precision resistor and resistor‑wire manufacturers, calibration and metrology laboratories, electrical component test houses, researchers working on resistive alloys, and standards bodies.
Q: Is it current or superseded?
A: The 2019 edition was published 01‑Apr‑2019. It has been superseded by a later ASTM B84 edition (a 2025 edition exists that replaces the 2019 text). The 2019 edition is therefore withdrawn and users should refer to the most recent edition for current requirements. Note: the withdrawal/supersession occurred with the later edition dated 2025.
Q: Is it part of a series?
A: It is a single ASTM test method within the ASTM B (Nonferrous Metals) series and has multiple revisions/interpretations over time; related ASTM standards cover complementary test methods and material specifications for conducting materials.
Q: What are the key keywords?
A: temperature coefficient, resistance change, resistor wire, resistance constants, precision resistors, alloy wire, test method, SI units.