ASTM A 340 Standard Terminology of Symbols and Definitions Relating to Magnetic Testing

In ASTM A 340 various terminologies have been given related to magnetic testing. Magnetic testing symbols and terminologies are used to indicate certain parameters, methodologies, and findings acquired during magnetic testing. Here are some examples of common symbols and their definitions.

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ASTM A 340 Standard Terminology of Symbols and Definitions Relating to Magnetic Testing

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Overview
Scope, Applications, and Benefits
Test Process
Specifications
Instrumentation
Results and Deliverables

Overview

ASTM A 340 is a standardized guide to the symbols, definitions, and terminology used in the magnetic testing of metallic materials. This standard provides the technical language for expressing the results of magnetic property measurement, magnetic material characterization, and electromagnetic testing programs. ASTM A 340 provides accepted symbols, units, and technical definitions for the magnetic properties of materials, such as permeability, coercivity, remanence, hysteresis, and flux density. This provides a standardized terminology framework to materials engineers, testing laboratories, and magnetic material researchers.

Scope, Applications, and Benefits

Scope

ASTM A 340 provides standardized symbols and definitions for all magnetic quantities, material properties, and test parameters for DC and AC magnetic tests on ferromagnetic and soft magnetic materials. This facilitates the interpretation, reporting, and comparison of results for magnetic material property data.

ASTM A 340 magnetic testing terminology covers:

Standardized symbols and definitions for magnetic field strength, flux density, and permeability
Coercive force, remanence, and hysteresis loop parameter terminology and symbol definitions
AC and DC magnetic property measurement terminology for soft magnetic material testing
Magnetic core loss, exciting power, and impedance terminology for electrical steel evaluation
Standardized units and conversion factors for magnetic quantity reporting per ASTM A 340

Applications

Electrical steel and soft magnetic material testing and property reporting programs
Permanent magnet material characterization and magnetic property specification
Transformer core, motor lamination, and magnetic component material evaluation
Electromagnetic and non-destructive magnetic testing of ferromagnetic materials
Research and development programs requiring standardized magnetic testing terminology

Benefits

Provides a standardized magnetic terminology framework for consistent property reporting
Supports magnetic material specification compliance and inter-laboratory data comparison
Enables clear communication of magnetic test results across engineering and research teams
Delivers consistent symbol and unit usage aligned with ASTM A340 magnetic testing standards
Reduces interpretation risk by establishing unambiguous magnetic quantity definitions

Test Process

Terminology Review

Applicable magnetic quantity symbols and definitions identified per ASTM A 340 requirements.

Symbol & Unit Verification

Magnetic test symbols and units verified against ASTM A 340 standardized definitions.

Property Reporting Alignment

Magnetic property data reported using ASTM A 340 standardized symbols and terminology.

Data Analysis & Reporting

Magnetic test results compiled using ASTM A 340 consistent terminology for test compliance result.

Technical Specifications

Parameter	Details
Applicable Materials	Ferromagnetic, soft magnetic, electrical steel, and permanent magnet materials
Terminology Scope	DC and AC magnetic property symbols, definitions, and standardized units
Magnetic Quantities Covered	Field strength, flux density, permeability, coercivity, remanence, core loss, hysteresis
Unit System	SI and CGS magnetic unit systems with defined conversion factors per ASTM A 340
Measured Outputs	Standardized magnetic property data, symbol usage records, and test compliance result

Instrumentation Used for Testing

DC and AC magnetic property measurement systems for ferromagnetic material testing
Hysteresisgraph and permeameter systems for hysteresis loop parameter measurement
Epstein frame and toroidal core test systems for electrical steel evaluation
Calibrated magnetic field generation and measurement instrumentation
Specialist magnetic data acquisition and property reporting software
Data reporting and magnetic property visualization system

Results and Deliverables

Magnetic property measurement data reported using ASTM A 340 standardized symbols
Hysteresis loop parameters including coercivity, remanence, and permeability per ASTM A 340
AC magnetic property data including core loss and exciting power per standardized terminology
Test compliance result assessed against defined magnetic property specification requirements
ASTM A 340 aligned magnetic test report for material approval and research submissions

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Frequently Asked Questions

ASTM A340 is a standard that provides standardized symbols, terms, and definitions for the interpretation of terminology for the purposes of magnetic testing and evaluation of magnetic properties.

ASTM A340 helps engineers, researchers, and technicians communicate clearly. It defines standard terms for magnetic testing. This reduces confusion and ensures everyone understands the symbols and definitions used in magnetic material characterization.

ASTM A340 includes terms related to magnetic fields, magnetization, magnetic flux density, permeability, hysteresis, and other features linked to testing and assessing magnetic materials.

ASTM A340 terminology is used in electrical engineering, materials science, power generation, electronics manufacturing, and research labs that study or apply magnetic materials and testing procedures.

ASTM A340 offers definitions and terminology. However, it does not detail specific magnetic testing procedures or measurement methods. Therefore, you need to refer to other standards to conduct magnetic property tests.