How to Calculate the Uncertainty of a Deadweight Primary Standard Machine

September 21, 2018 12:00:00

Any organization that is accredited must account for the uncertainty of their standards. The following are guidelines to assist in calculating the measurement uncertainty for dead weight primary standards.

Automatic Deadweight Load Cell Calibration Instrument for Improved Force Calibration Results

August 23, 2018 12:00:00

This post describes various force standards that are often used to calibrate force sensors and other devices. It discussed in detail the advantages of deadweight machines for the best calibration results. It then goes into detail about what it takes to calibrate a load cell properly.

Morehouse Training, Sessions, and Presentations at NCSLI 2018 in Portland August 26 - 30

August 16, 2018 12:00:00

Morehouse Training at NCSLI 2018 in Portland. We will be teaching two tutorials, one on force and one on torque as well as presenting at Session 5A and the Airline Committee meeting.

Load Cell Stability – How It Can Kill Your Uncertainty Budget

July 13, 2018 12:00:00

Load cell stability can potentially consume your uncertainty budget, cause the force measuring device to be out of tolerance, cause all measurements between the last calibration and the current calibration to be recalled, raise the accuracy specification of the system. This post covers what instability is and ways to potentially reduce instability.

Cosine Error Should be Considered in any Torque Measurement Process

June 21, 2018 12:00:00

Some ISO/IEC 17025 accredited labs performing torque calibrations may not entirely be considering the effect on the uncertainty from Torque Measurement Error from Applied Force Direction (cosine error)

Using Mass Weights to Calibrate Force Devices Can Result in a Large Measurement Error

May 29, 2018 12:00:00

This blog describes the expected errors from using mass weights to calibrate force measuring instruments such as load cells, crane scales, dynamometers, hand-held force gauges, and tension links. We examine the error in using LBS instead of LBF and vice versa. Gravity is not constant over the surface of the earth. The most extreme difference is 0.53 % and using mass weights for calibration and then using the instrument somewhere else can result in significant measurement errors.

Without the Right Adapters a Force Calibration Technician is Nothing Short of Being Called a Miracle Worker

May 07, 2018 12:00:00

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 the force calibration technician to calibrate load cells, truck & aircraft scales, tension links, dynamometers, and other force measuring devices with whatever they have in their laboratory.

ASTM E74-18 Changes

April 27, 2018 12:00:00

It’s been five years since ASTM E74 was last updated. The new standard ASTM E74-18 is released and this blog is going to detail some of the major changes between ASTM E74-13a and ASTM E74-18.

Guidance on Uncertainty Budgets for Force Measuring Devices Part 4. Calculating Uncertainty for Force Proving Instruments Calibrated to ISO 376

March 14, 2018 12:00:00

Morehouse CMC sheet will allow CMC calculation in accordance with ISO 376. The purpose of this blog is to provide guidance for determining the proper contributors of parameters for force measuring devices that should be taken into consideration when developing uncertainty calculations that support Calibration and Measurement Capability (CMC) uncertainty claim made on a scope of accreditation.

Understanding ISO 376

March 09, 2018 12:00:00

ISO 376:2011 Metallic materials β€” Calibration of force-proving instruments used for the verification of uniaxial testing machines standard explained. The ISO 376 standard is used worldwide, and it is a requirement for anyone calibrating in accordance with ISO 7500. If ISO 7500 is the requirement, then calibration needs to be performed in accordance with ISO 376 on the force-proving instruments used to certify the tensile machine. It is also the generally accepted force standard for most of the countries outside of North America for calibration of force-proving instruments such as load cells, proving rings, dynamometers, and other instruments used to calibrate similar types of instruments.