Without the Right Adapters, a Force Calibration Technician is Nothing Short of Being Called a Miracle Worker Figure 1 Bent Rod End Think about that for a minute. Would you want a surgeon to operate on you with kitchen utensils such as a serrated knife? Then why do some people (management cough) expect or ask […]
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). […]
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 Happens When You Overshoot a Test Point? Various calibration laboratories use hydraulic, screw, and other force calibration machines where it is difficult not to overshoot a test point. By talking about overshooting a test point, we are referring to loading past the desired point and then letting the creep in the hydraulic system naturally […]
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 […]
How to Calibrate Button Load Cells and Achieve Solid Results How to Calibrate Button Load Cells - Intro Anyone who has tried calibrating button-type load cells knows they do not repeat well in the rotation. The sensitivity to off-axis or side-loading conditions is quite high. High enough that 0.1 % of misalignment will produce a […]
Proving Ring Tare Load Correction Proof This blog post is on the strange side. I was rummaging through some of the work I did back in 1999 and found a proving ring tare load correction proof. I probably never published it as we were all waiting for the world to end at the turn of […]
lbf calculator - Adjusting lbf (pounds-force) Weights for Gravity at the Point of Use Morehouse lbf calculator or force to mass. When weights are used to perform force calibrations they should be corrected for the gravity and air buoyancy at the point of use. Where the values of the weights are given in true mass […]
