The full document is protected by copyright and typically requires purchase. You can find the latest version and historical revisions at: Official ASTM Store: ASTM E83 Standard Page Institutional Access: Often available through the ASTM Compass Digital Library for university or corporate members. Technical Summaries: Informational flyers from manufacturers like
| | Purpose | Relation to ASTM E83 | | :--- | :--- | :--- | | ASTM E4 | Verification of testing machines (load frames) | Complementary; E4 covers the force-measuring portion, while E83 covers the strain-measuring portion | | ASTM E251 | Calibration of bonded resistance strain gages | Excluded from E83; different methodology | | ASTM E8/E8M | Tension testing of metallic materials | Often references E83 for acceptable extensometer classes | | ASTM D638 | Tensile properties of plastics | References E83 for strain measurement | | ASTM E9 | Compression testing of metals | References E83 for compression strain measurement | | ASTM E1856 | Guide for computerized data acquisition systems | Related but not directly equivalent | | ASTM A370 | Mechanical testing of steel products | Incorporates E83 by reference |
To comply with ASTM E83, a system must be verified using a calibration device (like a laser interferometer or a digital micrometer) that is significantly more accurate than the extensometer being tested. 1. Temperature Stabilization
The absolute value of this error is compared against the table of allowable limits for the target Class. astm e83 pdf
ASTM E83 is an essential standard for any laboratory or organization that performs mechanical testing requiring accurate strain measurement. By establishing uniform procedures for verification and classification, it ensures that extensometer systems provide reliable, comparable data across different laboratories and applications.
According to the PDF, she had to perform three verification runs at five different displacement levels. Each reading had to fall within ±1% of the true value for Class B-1, or ±2% for Class B-2. Her lab’s old extensometer, the one with the loose spring and the dented blade, had never been verified. She’d assumed "calibrated last year" on the sticker meant forever.
ASTM E83 classifies extensometer systems into four classes: The full document is protected by copyright and
Authorized standards resellers (such as IHS Markit, Techstreet, or ANSI).
This article delves into the core of ASTM E83, exploring the technical requirements for verifying extensometer systems, its classification framework, and importantly, how to access the official standard document for your own laboratory or quality control processes.
The classification determines the suitability of an extensometer for specific testing applications. Class Accuracy Requirements Classification Maximum Error of Indicated Strain (% of reading) Absolute Error Limit (whichever is greater) ±plus or minus ±plus or minus 0.00001 in. / ±plus or minus 0.00025 mm Class B-1 ±plus or minus ±plus or minus 0.0001 in. / ±plus or minus Class B-2 ±plus or minus ±plus or minus 0.0001 in. / ±plus or minus Class C ±plus or minus ±plus or minus 0.0004 in. / ±plus or minus Class D ±plus or minus ±plus or minus 0.0030 in. / ±plus or minus Class E ±plus or minus ±plus or minus 0.0300 in. / ±plus or minus Application Matching The current edition
The tensile test began. The steel yielded at 485 MPa, right where it should. The extensometer, now a faithful servant, delivered the 0.2% offset data without complaint.
She looked at the extensometer on her desk. The dented one. Its last verification certificate, if it ever had one, was gone.
While the ASTM E83 PDF is a copyrighted document that must be purchased through official channels, the investment is minimal compared to the cost of incorrect material property determinations or failed quality audits. The current edition, ASTM E83-25, represents the latest thinking in extensometer verification and should be the reference for all new testing programs.
Typically required for determining high-precision properties like Young's Modulus (modulus of elasticity).