Guidance on Uncertainty Budgets for Force Measuring Devices Part 3. Calculating Uncertainty for Force Measuring Devices for Measurement or Calculating Uncertainty for Force Measuring Devices Background: Currently, there are discrepancies regarding what is acceptable for a force calibration uncertainty budget. A common mistake is to include too many lines from the load cell specification sheet. For […]
Guidance on Uncertainty Budgets for Force Measuring Devices Part 2. Calculating Uncertainty in Accordance with ASTM E74 Standard Calculating Uncertainty in accordance with ASTM E74 Standard Background: ASTM E74 Standard Practice of Calibration of Force-Measuring Instruments for Verifying the Force Indication of Testing Machines is the standard followed by many in North America for the […]
Guidance on Uncertainty Budgets for Force Measuring Devices Part 1. Why Do We Need a Solid Guidance Document? Uncertainty Budgets for Force Measuring Devices Introduction: All calibration laboratories accredited to ISO/IEC 17025 must submit uncertainty calculations for the Calibration and Measurement Capability uncertainty claims included in the scope of accreditation. The assumptions made to determine the uncertainty […]
What is Measurement Risk? What is Measurement Risk - Imagine that a satellite is launched into space and communications are intermittent. This happens because the satellite is wobbling, which causes connectivity problems in the receiver. The cause of the wobbling is identified: it is the result of not using a calibration provider with a low […]
Does Resolution Need to be in an Uncertainty Budget? There’s a question I’ve heard asked more often than it should be: "Does resolution need to be in an uncertainty budget?" If the device’s resolution is digital—displaying the least-significant digit increment as a single digit from zero to nine—it is assumed that it somehow increments or […]
Calibration and Measurement Capability (CMC) Force Workbook- ASTM E74 Uncertainty Morehouse has developed a force workbook in Excel to help those trying to figure out measurement uncertainty and how to calculate their Calibration and Measurement Capability (CMC). Updated 10/30/2021! The new update contains coefficients for interpolating uncertainty. Most of this workbook is set up for […]
Metrological Traceability for Force Metrological Traceability for Force - Metrological Traceability: Property of a measurement result whereby the result can be related to a reference through a documented unbroken chain of calibrations, each contributing to the measurement uncertainty. This article will define each level of the measurement hierarchy as it relates to measurement uncertainty for […]
Calculating Calibration and Measurement Capability (CMC) Using the ASTM Lower Limit Factor (LLF) In accordance with the ASTM E74 standard, Morehouse reports the ASTM Lower Limit Factor (LLF) which is reported on page one of the calibration certificate and is not uncertainty. ASTM E74-06 used to call LLF the uncertainty. The ASTM E74-06 standard was […]
