Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

New NIST Acquisition System for Reading Charpy Machine Encoders



Enrico Lucon, John S. Quintavalle, Damian Lauria


A new acquisition system was developed at NIST for reading angle values from the digital encoders of the three Charpy reference machines in Boulder, Colorado. The associated LabView software provides the conversion from encoder angles to absorbed energies, and allows quantifying energy losses due to windage and friction through the execution of five free swings. The accuracy of the a new acquisition system was verified by comparing Charpy test results obtained using both the old system (Tinius-Olsen encoder boxes) and the new system (National Instruments DAQ board + LabView software).
NIST Interagency/Internal Report (NISTIR) - 8497
Report Number


Absorbed energy, acquisition system, Charpy test, digital encoder, LabView software


Lucon, E. , Quintavalle, J. and Lauria, D. (2023), New NIST Acquisition System for Reading Charpy Machine Encoders, NIST Interagency/Internal Report (NISTIR), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed June 18, 2024)


If you have any questions about this publication or are having problems accessing it, please contact

Created November 13, 2023