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.
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)
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.
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.
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.
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.
ISO 376:2011 Metallic materials — 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.
The article discusses the differences between ISO 376 and ASTM E74 in hopes to prevent intermixing of the standard as we had heard of companies using an ASTM E74 calibration to certify a tensile machine to ISO 7500.
Morehouse has been performing ISO 376 calibrations for over the last fifteen years. In this time frame, we have changed our ISO 376 certificate format three times. The latest change offers additional information such as calibration graph per run and is laid out in a way that is much more cohesive making it easier to read and understand
This blog details the calibration multi-axis load cells in a Morehouse Universal Calibrating Machine. Similar adapters and the same method could be used to calibrate multi-axis load cells in a Morehouse Deadweight frame. Please contact us for more information.