Astm E83 Pdf [upd] -

These classes are defined in Table 1 of the standard, which specifies both relative error limits for larger strain values and fixed error limits that apply at very low strain levels where relative errors would become unrealistically restrictive. This dual-limit approach ensures practical yet rigorous requirements across the entire measurement range.

The extensometer is mounted to the calibration apparatus at its nominal gauge length. astm e83 pdf

It applies to instruments that indicate or record values proportional to length changes—specifically, extensometers measuring tensile or compressive strain. These classes are defined in Table 1 of

An ASTM E83 verification cannot be performed using standard tools. It requires a specialized calibration apparatus, often called an or micrometer drum , which itself must be certified and traceable to a national metrology institute like NIST. Step-by-Step Procedure: It applies to instruments that indicate or record

The physical calibration must be performed using a certified verification apparatus (often called an extensometer calibrator or micrometer tower). This apparatus must be highly accurate—typically traceable to national standards like NIST—and must have an accuracy at least five times greater than the extensometer being verified. Step-by-Step Verification Procedure