Specific equations for calculating error and repeatability.

ASTM E83, titled provides the protocols for calibrating instruments that measure changes in length.

is often sufficient for general tension testing where high precision in the elastic region is less critical. 🛠️ The Verification Process

The standard categorizes extensometers into "Classes" based on their maximum error and repeatability. When you review an ASTM E83 PDF, you will see a table detailing these requirements: Relative Error of Gauge Length Fixed Error (whichever is greater) ±0.00001 in. Class B-1 ±0.0001 in. Class B-2 ±0.0001 in. Class C ±0.001 in.

is the most common requirement for determining the modulus of elasticity in metals.

Many universities provide access to ASTM Compass for students and faculty.

ASTM E83 is a fundamental technical standard used by engineers, labs, and manufacturers to ensure the accuracy of extensometers. These devices are critical for measuring the strain and deformation of materials during mechanical testing.

Platforms like ANSI or IHS Markit.

The extensometer and the verification apparatus must be kept in the same environment for a specific period to prevent thermal expansion from skewing results. 2. Multi-Point Calibration

The exact wording required for certification documents. 💡 How to Access ASTM E83