It applies to instruments used for both tensile and compressive strain, using either SI or US customary units. Exclusions:
Extensometers are critical instruments used to measure changes in the length of a material under stress. To ensure these measurements are precise and reliable, industries rely on the ASTM E83 standard.
on calculating the percent error during verification. astm e83 pdf
The standard does not treat all extensometers equally. Instead, it divides systems into distinct based on their maximum permissible error. The class you need depends entirely on the sensitivity of your test (e.g., measuring high-rigidity ceramics vs. high-elongation plastics).
This gage-length based categorization ensures that the verification requirements are appropriate for the scale of measurement being performed. A short-gage extensometer used for localized strain measurements has different performance characteristics than a long-gage device measuring overall specimen elongation. It applies to instruments used for both tensile
| | Details | | :--- | :--- | | Full Title | Standard Practice for Verification and Classification of Extensometer Systems | | Current Edition | ASTM E83-25 (published June 2025) | | Superseded Editions | E83-23, E83-16, E83-10, E83-00e1, E83-98, E83-90, and earlier | | Pages (Current) | 18 pages | | File Size (PDF) | Approx. 610 KB (standard); 1.2 MB (Redline) | | DOI | 10.1520/E0083-25 | | ICS Code | 19.060 (Mechanical testing) | | ASTM Committee | E28 (Mechanical Testing) | | Subcommittee | E28.01 (Calibration of Mechanical Testing Machines and Apparatus) | | Price (Typical) | Approximately USD $60–85 depending on source and format | | Primary Language | English; some translated versions exist | | Official Publisher | ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA, 19428-2959 USA |
Extensometers are classified by the maximum allowable error. Common classes include: on calculating the percent error during verification
The standard defines procedures to verify that an extensometer—the device used to measure length changes in a specimen during tensile or compressive testing—is performing within specified error limits. Afnor EDITIONS Dimensionality
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She hadn't even known what an extensometer was two months ago. Now she knew it was a device that clamped onto a metal sample to measure tiny stretches as you pulled it apart. And she knew, with a sinking certainty, that her entire dataset was garbage because she’d used Class C grips on a test requiring Class B-2 precision.