Measurement and Statistics : Metrology


Measure for Measure: Measuring Proficiency

by Shah, Dilip

While proficiency is indirectly a result of the employees’ skills, training and other factors, proficiency testing assesses an individual laboratory’s measurement performance against the industry measurement performance....


Necessary Measures

by Johnson, Louis; Deaner, Maureen;

Learn the difference between standard and expanded gage repeatability and reproducibility (R&R) studies and how expanded gage R&R helps clarify measurement system variation....


Measure for Measure: Calculating Uncertainty

by Grachanen, Christopher L.

In metrological circles, there are many different statistics and figures of merit used to gauge the quality of measurement data....


Measure For Measure: Pass or Fail

by Grachanen, Christopher L.

The calibration certificate—commonly referred to as a calibration report—is the documented evidence that a piece of test equipment was, at some point, determined to be within or out of its intended operating specifications....


Expert Answers: April 2014

by QP Staff

Coordinate measuring machine profile capability ......


Measure for Measure: Assessing Performance

by Grachanen, Christopher L.

For many calibration and testing laboratories, routine proficiency testing is a requirement for obtaining and maintaining accreditation status....


Measure for Measure: The Right Number

by Shah, Dilip

Taking measurements during the calibration process consumes time, and time is money. How many measurements do you need to ensure confidence in the calibration?...


Measure for Measure: Careful Comparison

by Bucher, Jay L.

Starting a calibration program from the ground floor can be a daunting task. But it also can help an organization realize it has taken only the first steps in ensuring a quality program....


Measure for Measure: Are You Sure?

by Grachanen, Christopher L.

From a metrological purist perspective, measurement results reported with just an interval do not give sufficient information as to the uncertainty (unlikelihood) that the obtained results are within their stated interval....


Measure for Measure: Know Your Surroundings

by Grachanen, Christopher L.

Ambient conditions during tests and calibration activities can have a big influence on measurement results. Some of these influences affect the device being measured; some affect the measurement system; and some affect both....


Measure for Measure: Verifying the Art

by Niemann, Craig

Measurement may be considered a science and an art. It is a science in that it is based upon the laws of physics and math. Some consider it an art because elements of human judgment are needed to translate measurement from abstract to real application....


Measure for Measure: What If?

by Bucher, Jay L.

There are no requirements that call for traceable calibration to the National Institute of Standards and Technology or any other National Metrology Institute (NMI). Nor are there any requirements for other countries to be traceable to their NMIs....


Measure for Measure: On Solid Ground

by Bucher, Jay L.

There are a few fundamentals every calibration or metrology department should know to get moving in the right direction....


Measure for Measure: Military-Grade Advice

by Niemann, Craig A.

In 1990, the new chief of the U.S. Air Force's laboratory certification office offered a few words of advice to the managers of the USAF calibration laboratories on how to set themselves up for success—advice still applicable today....


Measure for Measure: History Lesson

by Grachanen, Christopher L.

During my years working in the metrology field, I have been frequently reminded of how technological advancements affect the design and functionality of inspection, measurement and test equipment, and the methods used for making measurements....


Open Access

Back to Basics: Assessing Failure

by Stamm, Scott

A measuring instrument, gauge or device failed recalibration, and you have been asked to determine the influence on previously produced products. Where do you start, and what do you do?...


Volviendo a los Fundamentos: Evaluar la Falla

by Stamm, Scott

Un instrumento de medición, calibre o dispositivo falló durante la recalibración y se le pidió que determine la influencia sobre productos producidos con anterioridad. ¿Por dónde empezar, y ¿qué haces?...


Measure for Measure: Balanced Budget

by Shah, Dilip

In a previous edition of this column, I discussed Type-A and Type-B contributors of measurement uncertainty and what goes into a measurement budget. In this installment, I will outline a process for building that budget....


Measure for Measure: Matter of Life and Death

by Bucher, Jay L.

In too many cases, lack of traceability is a daily occurrence. I'm not talking about the traceability of a batch or lot of product. I’m referring to the traceability of test instruments....


Measure for Measure: Short Supply

by Grachanen, Christopher L.

ASQ’s Measurement Quality Division (MQD) and the National Conference of Standard Laboratories International (NCSLI) have partnered on several projects to promote and enhance the metrology field with an education and training outreach program for...


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