Recent Posts

Tips from the Cal Lab: How to use an Alignment Plug for Compression Calibration Setups

Centering a load cell is critical to obtaining the correct line of force and reducing calibration errors. An alignment plug along with an adapter plate can be used to center a load cell, whether it is a reference standard in a calibrating machine or a unit under test. Why use an Alignment Plug? No matter […]

Ultimate Guide for Understanding Uncertainties on a Morehouse ASTM E74 Calibration Certificate

Reporting the Expanded Uncertainty of the measurement is a requirement of ISO/IEC 17025 and likely always will be. However, if you look at several different certificates of calibration, their Expanded Uncertainty reported, contributors and reporting methods will vary greatly. Some include a blanket statement of uncertainty, while others simply ignore significant contributions required by several […]

100 Years and 100 Blog Posts

The 100th blog post, what to do? 100 years in business, 100 blog posts, several papers, and technical articles along the way. Communication has changed from a switchboard phone to a handheld personal computer that can receive this message. From the proving ring to today's deadweight calibrating machines, calibration technology has also changed over the […]

Understanding the Calibration Coefficients for Load Cells and Other Force-Measuring Devices

What Coefficients Do ASTM E74, ISO 376, and other standards may use calibration coefficients to characterize the performance characteristics of continuous reading force-measuring equipment better. These standards may use higher-order fits such as a second or third-order fit (ISO 376) or ASTM E74 allows higher-order fits up to as high as a 5th order. Both […]

Load cell calibration: What does “Traceable to NIST” really mean?

Load cells have various applications across several fields, from verifying the correct amount of stamping press force to testing rocket thrust stands. They are so common that almost everyone owns several in some shape or form, whether they realize it or not. Load cells are found in your car, bathroom scale, and almost any digital […]

ASTM E74 and Accuracy Statements: Why an Accuracy Statement does not Belong on Every Calibration Certificate

The current ASTM E74-18 standard is the title Standard Practice for Calibration and Verification for Force-Measuring Instruments. Here at Morehouse, we support the best practices that are outlined in the ASTM E74 standard as the representation of the expected performance of a load cell or other force-measuring instrument. What may be a bit of an […]

Does a Backup Meter for Your Load Cell System Make Sense?

A client has four load cells on one-meter and the technician loses, drops, or breaks the current indicator. This is a scenario we see happen quite a bit. If Murphy can strike, chances are it will eventually occur. We have had numerous clients ask us about how to backup or how to substitute a meter […]

Evaluating the "Usefulness" of force calibration equipment

Usefulness may be the one word we often neglect to consider when purchasing force-measuring equipment, or any test equipment. Let's think about that for a bit and let it sink in. Most people I have run across seem to be concerned with price, a manufacturer's specification sheet, and maybe the physical size of the force-measuring […]

Specifying a Tolerance, the Difference Between Percentage of Indicated Value vs % of Full-Scale Output

In looking at various equipment, it seems the force equipment in the test and measurement industry specifically has mainly specified tolerances as a percent of full scale. Several crane scales, tension links, hand-held force gauges follow this trend when determining accuracy or tolerance. There are a few manufacturers who use % Indicated Value (IV). My […]

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