Key Takeaways: Normalized Error (En) Definition: A statistical measure used to compare a laboratory’s result against a reference value, accounting for the uncertainties of both. The Pass/Fail Limit: An |En| ≤ 1.0 is considered “Satisfactory.” An |En| > 1.0 is “Unsatisfactory” and requires investigation. The Formula: En = (xlab – xref) / (√(Ulab2 + Uref2), […]
Have you taken a moment to look at other laboratories calibration and test reports? Well, you should. You may have noticed that many laboratories are putting the Combined ILAC-MRA Mark on their reports, and I think you should too. In this article, I am going explain what the Combined ILAC-MRA Mark is, how to get […]
The first quarter is coming to an end, and I am sure that most of you have forgotten about the goals that you set back in January (i.e. New Year’s). So, now is the time to look at your quarterly financial reports and see if you are achieving your goals. Whether or not you […]
Exemptions and uncertainty to two terms that are not commonly phrased together in metrology. However, ILAC has made provisions for exemptions to reporting uncertainty in measurement while maintaining requirements for accredited calibrations. This article will explore the three exemptions to reporting uncertainty in calibration reports as per the ILAC P14:01/2013. If you are still reporting […]
One of the most frequently asked questions that I receive is “How do I convert my uncertainty estimates to a formula?” In my last post, I showed you how to calculate CMC Uncertainty using the equations in your scope of accreditation. Now, I am show you have to reduce your uncertainty estimates to an equation. […]
Have you ever looked at your scope of accreditation and wondered, “How do I calculate uncertainty with this equation?” If so, you are in luck! I am going to show you step by step, how to calculate CMC uncertainty using the equations in your scope. Over the last two months, I have received a […]
Each month, I write one or two articles and post them on my blog. My goal is to appeal to my readers and gain new subscribers. If not, what reason would I have for a blog! Last year (i.e. 2014) was a good year for me. It was a busy year! However, I still made […]
If you are an ISO/IEC 17025 accredited laboratory, you have probably heard the acronym CMC before. It is commonly used on a calibration laboratory’s scope of accreditation to express the laboratory’s measurement capability. If you are a testing laboratory, you are probably less familiar with this acronym; but, you shouldn’t be. Many testing laboratories are […]
NCSLI VA Section Meeting Wednesday, December 10, 2014; 9:00AM to 3:30PM Please Join Us, ITS FREE! Click here to visit the NCSLI VA Section Webpage Location Old Dominion University Peninsula Center | 600 Butler Farm Rd. | Hampton, VA 23606 Directions: From I64E: 1. Take exit 261B, Hampton Roads Center Parkway, 2. Continue on Hampton Center Pkwy […]
Reducing measurement uncertainty has become a goal for many laboratories seeking to improve quality. Whether it is enhance their reputation or make themselves more competitive in the marketplace, many want to improve their measurement capabilities. To help organizations accomplish this goal, I have compiled a list of three highly-effective methods to reduce measurement uncertainty. […]
Hello. I am a Metrologist and consultant who loves to calculate measurement uncertainty for calibration and testing laboratories. Learn more about me here.
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