The verification process outlined in the ASTM E83 PDF involves a series of rigorous steps:
Specific equations for calculating error and repeatability.
One of the most misunderstood aspects of the standard is the You cannot simply say "My extensometer is Class B-1." You must specify the strain range (e.g., Class B-1 from 200 µε to 2000 µε). Outside that verified range, the classification is void.
Common for plastics testing and applications requiring moderate-to-high accuracy over larger strain ranges.
The standard is also available for purchase from a network of authorized ASTM distributors, such as Intertek Inform, SAI Global, and the Irish Standards shop. When buying from a distributor, it is wise to confirm you are receiving the latest version (E83-25). astm e83 pdf
If the certificate claims "Class B-1" but does not specify the range, the certificate is non-compliant with the standard.
The standard, titled "Standard Practice for Verification and Classification of Extensometer Systems," is a critical document for any laboratory involved in mechanical testing. It provides the framework for ensuring that extensometers—instruments used to measure small changes in the length of a material under stress—provide accurate and reliable strain data. Overview of ASTM E83
Free PDFs are usually:
ASTM E83 is a standard practice that outlines the procedures for the verification and classification of extensometer systems. It establishes a strict methodology to determine the maximum permissible error for instruments used to measure axial strain during tension, compression, or fatigue testing. The verification process outlined in the ASTM E83
Reliable stress-strain curves depend on accurate strain data. Incorrect strain measurement leads to faulty material property calculations.
Given its essential role, obtaining the official, most up-to-date version of ASTM E83 is critical for any testing laboratory.
The ASTM E83 standard outlines a comprehensive framework for evaluation. It breaks down into several core areas: 1. Scope and Application
The standard defines six distinct accuracy classes: If the certificate claims "Class B-1" but does
: The testing environment must be maintained at a stable temperature (typically
The most precise, used for extremely tight tolerances.
Calibration laboratories must follow precise ASTM guidelines to maintain ISO/IEC 17025 or NADCAP accreditations.
: Step-by-step methods for calibrating extensometers against known reference displacements, such as calibrated micrometers or gauge block systems.
: Essential for laboratories performing mechanical testing to ensure compliance with material specifications like ASTM E8 (tensile testing of metals).