ASTM E74 and Accuracy Statements: Why an Accuracy Statement Does Not Belong on Every Calibration Certificate - Intro The current ASTM E74-18 standard is the title Standard Practice for Calibration and Verification for Force-Measuring Instruments. Here at Morehouse, we support the best practices that are outlined in the ASTM E74 standard as the representation […]
Using Mass Weights to Calibrate Force Devices Can Result in a Large Measurement Error Morehouse Benchtop 10,000 lbf Calibrating Machine When metrologists talk about measurement error, we’re talking about the difference between the nominal value and what the instrument is reading. If 10,000 lbf is applied to a force measuring device and the readout displays […]
New ASTM E74-18 Changes - Intro It’s been five years since ASTM E74 was last updated. The last version of the standard was ASTM 13a, and I believe we may have an ASTM E74-18a. However, the new standard has been released and this blog is going to detail some of the major changes between […]
Guidance on Uncertainty Budgets for Force Measuring Devices Part 4. Calculating Uncertainty for ISO 376 Uncertainty Analysis ISO 376 Uncertainty Analysis Introduction: All calibration laboratories accredited to ISO/IEC 17025 are required to submit uncertainty calculations for the Calibration and Measurement Capability uncertainty claims included in the scope of accreditation. The assumptions made for the determination […]
Understanding ISO 376 Our last blog focused on the difference between ISO 376 and ASTM E74. That blog was a comparison between the major differences when comparing both standards and can be found here. What we hope to do with this blog is go into a bit more detail and explain the ISO 376:2011 Metallic […]
ASTM E74 is Not the Same as ISO 376 Morehouse has performed ASTM E74 and ISO 376 calibrations for over fifteen years. We have been calibrating in accordance with the ASTM E74 standard since its introduction in 1974 and performing ISO 376 calibrations since sometime in early 2000. Before early 2000, ISO-376 was a DIN […]
Morehouse ISO 376 Calibration Certificates Morehouse has been performing ISO 376 calibrations for over the last fifteen years. In this time frame, we have changed our ISO 376 calibration certificate format three times. The latest change offers additional information such as a calibration graph per run and is laid out in a way that is […]
Multi-axis load cell Multi-Axis load cells are becoming more popular, and the calibration of such load cells creates various challenges to ensure minimal cross-talk and to calibrate each axis of the load cells. This blog describes a detailed test plan for calibrating a 3-axis multi-axis load cell in a Morehouse. Universal Calibrating Machine (pictured below). […]
The Top 5 Costly Force Measurement Mistakes #1 of 5 Costly force measurement mistakes Most calibration laboratories will say a device is "In Tolerance" without considering the uncertainty of their measurement process. This equates to you not using a calibration laboratory that has standards to meet your needs and accounts for measurement risk properly. Most […]
Why the Location of the Measurement is More Important than You May Realize Calling an instrument “In Tolerance” is about the location, location, and location of the measurement. It’s also about the uncertainty of the measurement, but a bad location will raise the Probability of False Accept (PFA) significantly. The Probability of False Accept is […]
Recommendations for Specifying ASTM E74 Calibration Services Recommendations for Specifying ASTM E74 Calibration Services. This document is intended to help properly specify what you may need for ISO/IEC 17025 accredited ASTM E74 calibrations to ensure you are getting exactly what you need: Verification of the Calibration Supplier Can meet the Requirement. Reviewing many accredited laboratory […]
Calibration Intervals - When is it Time to Recalibrate? Calibration Intervals A calibration interval is the period between two consecutive calibrations of MT&E. This interval is crucial for ensuring that the equipment continues to operate within its specified performance and the claimed Calibration and Measurement Capability (CMC) uncertainty parameter, sometimes referred to as […]
