Morehouse CMC sheet will allow CMC calculation in accordance with ISO 376. The purpose of this blog is to provide guidance for determining the proper contributors of parameters for force measuring devices that should be taken into consideration when developing uncertainty calculations that support Calibration and Measurement Capability (CMC) uncertainty claim made on a scope of accreditation.
ISO 376:2011 Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial testing machines standard explained. The ISO 376 standard is used worldwide, and it is a requirement for anyone calibrating in accordance with ISO 7500. If ISO 7500 is the requirement, then calibration needs to be performed in accordance with ISO 376 on the force-proving instruments used to certify the tensile machine. It is also the generally accepted force standard for most of the countries outside of North America for calibration of force-proving instruments such as load cells, proving rings, dynamometers, and other instruments used to calibrate similar types of instruments.
The article discusses the differences between ISO 376 and ASTM E74 in hopes to prevent intermixing of the standard as we had heard of companies using an ASTM E74 calibration to certify a tensile machine to ISO 7500.
Morehouse has been performing ISO 376 calibrations for over the last fifteen years. In this time frame, we have changed our ISO 376 certificate format three times. The latest change offers additional information such as calibration graph per run and is laid out in a way that is much more cohesive making it easier to read and understand
This blog details the calibration multi-axis load cells in a Morehouse Universal Calibrating Machine. Similar adapters and the same method could be used to calibrate multi-axis load cells in a Morehouse Deadweight frame. Please contact us for more information.
Finally, a way to reduce excessive clutter and simplify tensile calibrations for Load Cells, Crane Scales, Tension Links, and Dynamometers.
If you get everything else correct and choose the wrong indicator, the overall system performance can suffer. This blog is going to better detail three specific indicator types. These are: 1- An A/D indicator that requires a computer to read the display 2- A battery powered portable indicator with minimal span points 3- A versatile indicator that can be used with several span points or accurately display mV/V through calibration.
What is acceptable for a force calibration uncertainty budget when the device is not calibrated to a known standard and just to a couple manufacturer's specifications. This document aims at helping laboratories calculate force measurement uncertainties for Force Measuring Devices for Measurement or Verification of Force.
The ASTM E74 uncertainty appendix does not align with ILAC Policy for Uncertainty in Calibration ILAC P-14 which can be a problem for any accredited calibration laboratory. The purpose of this post is to combine the ASTM E74 calibration method, ILAC P-14, and JCGM 100:2008 together to help labs calculate measurement uncertainty per point throughout the loading range with the appropriate coverage factor k to meet their accreditation requirements.
This is part 1 of 4 total blog posts. This post deals with why Force Calibration needs a guidance document. The hope is to expand each of these posts and let them stand on there own to a specific force application.