How to Calibrate S-Beam or S-Type Load Cells and Achieve Good Results Figure 1 General S-Beam Load Cell General Overview of S-beam or S-Type load cells S-beam or S-Type load cells were designed for several weighing applications. Most were designed to be mounted on a scale, used as a lifting system, or process weighing for […]
Important Aircraft and Truck Scale Calibration Tips Figure 1: Example of Aircraft Weighing Aircraft and Truck scales come in all different shapes and sizes and typically serve one purpose, to approximate the weight of an aircraft or truck. Why might that be important? For Aircraft, it's about knowing the center of gravity CG. The center […]
Why a 4:1 TUR is Not Enough: The Importance of Analyzing the Probability of False Accept Risk Figure 1 Graph Showing Method 5 Acceptance Limits Several organizations and publications reference the use of a 4:1 Test Uncertainty Ratio (TUR). Some standards even reference a TUR requirement greater than or equal to 4:1. The question to […]
Force Measurement Error – Time Interval Between Two Successive Loadings Has anyone ever wondered if there is a difference in calibration results if the time interval between two successive loadings is changed? Is faster better and does it matter if the calibration takes 10 minutes on an automated machine pictured in Figure 2 below, or […]
Morehouse Versatile Cable Tensiometer and Force-Measuring Instrument Calibrator Figure 1 Morehouse 2,000 lbf Cable Tensiometer At Morehouse Instrument Company, we’re justifiably very proud of our new 2,000 lbf Cable Tensiometer Model PCM-2MD-T1. You can see in Figure 1 (above) that our new Tensiometer calibrator provides a safe and practical way to calibrate cable tensiometers. The […]
What Makes a Force Calibration Machine Fit for Use? - Intro Figure 1: Morehouse 1,000 lbf automated deadweight machine At Morehouse Instrument Company, we’re justifiably very proud of our 1,000 lbf Automated Deadweight Machine. You can see in Figure 1 (above) that the force calibration machine looks level and square. What the picture doesn’t show […]
How to Calculate the Uncertainty of a Deadweight Primary Standard Machine Figure 1: Morehouse 1,000 lbf automated deadweight machine Deadweight Force Machines or Primary Force Standard (CMCs as low as 0.001 % of applied force) – a deadweight force applied directly without intervening mechanisms such as levers, hydraulic multipliers, or the like, whose mass has […]
Load Cell Stability – How It Can Kill Your Uncertainty Budget Load cells are a combination of metal, strain gauges, adhesive, and more. Like humans, every measuring instrument is subject to aging. Load cells age from mechanical stress or fatigue, and over time this ensures that there will be some instability in the system. Some […]
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 […]
