T11 (AM Only)

Force Calibration

Author/Presenter: Henry Zumbrun

Courtesy of: Morehouse Instrument Company


Abstract: Anyone making force measurements should attend this course if they are not familiar with all of the sources of measurement error in relation to force measurements. Examples of these errors include proper calibration adapters. Using a top block for compression loading can produce up to a 0.5 % error if the end user is using something with a different hardness and/or flatness. Using the wrong pin size on a tension link can cause a 2 % error on a device with an accuracy of 0.1 % of full scale. The measurement errors demonstrated and discussed will include errors associated with improper alignment, use of different and/or incorrect adapter types, thread depth and thread loading as well as some load cell troubleshooting techniques. During the workshop, we will discuss over twenty common major error sources and how to avoid them. We will then focus on ISO/IEC 17025:2017 section 6.4.5 “The equipment used for measurement shall be capable of achieving the measurement accuracy and/or measurement uncertainty required to provide a valid result.” Taking this section into account, we will discuss measurement decision risk with a focus on NCSLI/ANSI Z540.3 Method 5 & Method 6 and how the Test Uncertainty Ratio (TUR) impacts the laboratories ability to make statements of conformity to a specification per section 7.1.3 of the ISO/IEC 17025:2017 standard. Recommended skill level for the course is anyone who has experience with force equipment and wants to learn how they can minimize potential measurement errors and reduce their measurement risk.

Learning Outcomes:

Identify and Quantify force measurement errors

Implementation of techniques for proper calibration of equipment

Use the appropriate force equipment and method to make statements of conformance