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 […]
Automatic Deadweight Load Cell Calibration Instrument for Improved Force Calibration Results Figure 1: Morehouse 1,000 lbf Automatic Deadweight Load Cell Calibration Machine Deadweight Load Cell Calibration Machine used to calibrate load cells may vary from ones with the lowest overall uncertainty such as deadweight force standard machines sometimes called primary standards to single or multiple transducer […]
Big News: Morehouse Training, Sessions, and Presentations at NCSLI 2018 in Portland August 26 - 30 Another year and another NCSLI conference are soon approaching. This year both Henry Zumbrun and Edward Lane will be headed out to NCSLI. I will be teaching two tutorials on Monday, August 20th, presenting some torque wrench PT findings […]
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 […]
Cosine Error Should be Considered in any Torque Measurement Process ISO/IEC 17025 When Calculating Torque Measurement Error Cosine Error should be considered A ‘vector’ is known as a quantity that is defined by its size and direction. Every time the effect of a known force is evaluated on a static or dynamic system, all applied, […]
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 […]
