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 […]
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 […]
How to Make Load Cells Perform Better - 3 Benefits of Installing a Threaded Adapter on Load Cells How to make load cells perform better. #1. The output of the load cell is more repeatable - When forces are applied to the load cell, the values obtained during calibration should repeat within the expected performance […]
Digital Load Cell Amplifier You’ve got the most expensive load cells, high-quality data acquisition systems, and very smart technicians working for you. What if your only problem is that the digital load cell amplifier you are using, is drastically hindering your total system performance? Morehouse Digital Load Cell Amplifier for Controllers (LAC) Can Improve System […]
Making a Statement of Compliance: The 3 Main Reasons Calibration Laboratories Fail to Get Things Right Making a statement of compliance introduction. About a year after turning 40, I bought a pair of reading glasses. After another year, I started noticing a decrease in my overall vision and figured I needed to visit an eye […]
