Article published in Quality Digest written by Henry Zumbrun (Morehouse Instrument Company).
Recommended steps for calibrating instruments in accordance with ASTM E74-13a. Published in Quality Digest Online in July 2016
This paper will describe our calibration process, including the calculations of our Calibration and Measurement Capability(CMC), as it appears on our scope of accreditation.
This paper describes NPL’s 2 kN·m torque machine — Now at Morehouse Instrument Company — a lever deadweight machine with a vertical torque axis and an uncertainty of ±0.002 %. Despite the greater difficulty in applying torques to a vertically mounted transducer, this design was selected as it enables a symmetric “pure” torque to be applied. In addition, this design provides adaptability, enabling comparisons with the application of asymmetric torque and “on-thefly” torque calibrations to be studied.