Ensuring compliance with quality standards like ISO 17025.

ASTM E83 classifies extensometers based on their performance, primarily the maximum permitted error of strain. Choosing the right class is crucial, as a higher class (like Class A) is required for high-precision modulus testing, while lower classes might suffice for general testing. Highest accuracy; maximum error of Class B-1: High accuracy; maximum error of Class B-2: Moderate accuracy; maximum error of Class C: Standard accuracy; maximum error of Class D: Lower accuracy; maximum error of

According to Section 6.2 of the astm e83 pdf , the verification device must be accurate to 1/4th of the permissible error of the extensometer. A standard micrometer usually works for Class B, but not for Class C.

Section 10: Classification. A table. She stared at it until the numbers blurred, then blinked.