Work Item
ASTM WK91750

Revision of A1038-19 Standard Test Method for Portable Hardness Testing by the Ultrasonic Contact Impedance Method

Rationale

Section 16.1 requires the user to take at least 3 measurements for verification and allows up to 2 measurements to be discarded at the user’s discretion. This means that an instrument can pass verification with only one measurement. One measurement is not sufficient to determine the accurate function of an instrument. Furthermore, an average of several measurements can still read in tolerance even if all the individual measurements are outside of the calibrated test block value. This ballot item increases the minimum number of measurements to 5 and adds an additional tolerance requirement for the range of the measurements.

Details

Developed by Subcommittee: A01.13

Committee: A01

Staff Manager: W Scott Orthey

Work Item Status

Date Initiated: 07-26-2024

Technical Contact: Tom Ott

Item: 000

Ballot:

Status: