Discover your Force Measurement Uncertainty
How to Reduce Measurement Errors and Meet Accreditation Requirements

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Customer Using Force measurement Uncertainty Tool
Applying the powers of mathematical and statistical tools, you can manage force measurement uncertainty. Using this free Force Measurement Uncertainty Tool, enter your calibration data to determine each test point's uncertainty. The data is automatically calculated and graphed for easy analysis!

Input required for analysis

Resolution of the calibration standard if non-deadweight and the unit under test.
Calibration and Measurement Capability (CMC) of the reference laboratory that calibrated the force measuring instrument.
Reference standard stability from two calibrations, performed at different times, or a conservative guesstimate for new calibrations.
ASTM LLF from the calibration report. If you are not using ASTM E74, replace this with non-linearity, and hysteresis (if making descending measurements).
Maximum temperature variation per the environment the force-measuring device is to be used at.
Other error data, such as side load sensitivity.
Output of up to 6-12 test points from 4 runs of tests as this meets repeatability requirements.
Output of same test point 10 times from up to 6 technicians. This meets between technicians Repeatability and Reproducibility.

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The Force Measurement Uncertainty Tool helps meet requirements for the following

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  • ASTM E74 Standard Practices for Calibration and Verification for Force-Measuring Instruments
  • ISO/IEC 17025:2005 & 2017 General requirements for the competence of testing and calibration laboratories
  • ILAC P-14:09/2020 Policy for Measurement Uncertainty in Calibration
  • ILAC P-10:07/2020 Policy on Metrological Traceability of Measurement Results 
  • JCGM: 100:2008 Evaluation of measurement data — Guide to the expression of uncertainty in measurement
  • Ukas M3003 Edition 4 - The Expression of Uncertainty and Confidence in Measurement
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Proficiency Testing is required by my accreditation body

With a few additional data points, our Force Measurement Uncertainty Tool can also calculate the En ratio for proficiency testing. This can be used to satisfy ISO 17025 section 7.7 j) & 7.7.2 b).

  • Measurement results of participating lab.
  • Measurement results of reference lab.
  • Expanded uncertainty of participating lab.
  • Expanded uncertainty of reference lab.

The force measuring instrument should be calibrated by dead weight primary standards to meet Proficiency Testing requirements.

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The Force Measurement Uncertainty Tool meets the requirements for the end-user of a force-measuring instrument to comply with JCGM 100:2008. The calculation of uncertainty is a requirement per ILAC P-14:09/2020 Policy for Measurement Uncertainty in Calibration Section 5.1, which states explicitly, "The Accreditation Body shall ensure that an accredited calibration laboratory reports the measurement uncertainty in compliance with the GUM."  

The Force Measurement Uncertainty Tool meets compliance with the GUM by: 

  • Allowing the user to calculate Effective Degrees of Freedom per GUM using the Welch-Satterthwaite formula. 
  • Uncertainty calculations correcting Type A for population standard deviation for infinite degrees of freedoms. Note: This is useful if you want the coverage factor to be consistent throughout the measurement range.

Learn more about measurement uncertainty:

  • How to calculate force uncertainty for CMC uncertainty parameter  Watch Video
  • How to calculate repeatability for force CMC uncertainty  parameters  Watch Video
  • Best practices for force measurement  Watch Video
  • Uncertainty Propagation for Force Calibration Systems  Download Paper
Download our Force Measurement Uncertainty Tool now to reduce your force measurement error.
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