posted 22 January 2001 01:43 PM               

I did a forum search and found numerous 'hits' including https://elsmar.com/ubb/Forum4/HTML/000072.html -- You might want to check out the thread.

posted 31 January 2001 09:49 AM              

There is no clear cut method of calculating measurement uncertainty. I highly suggest taking a course to become familiar with the concept. Once you understand the concept, and the statistics behind it, it actually becomes fairly easy. I say easy, as opposed to simple. After you take the classes, it is easiest to come up with a general list of contributing factors to calibration uncertainty, such as temperature growth of UUT and standard/M&TE, deformation, repeatability, master uncertainty, resolution error, etc.

I've been where you are, take the class. The books make great sense to me now, but before it was put into plain english, they were well above my head. To save yourself, and your company, some money I suggest you start with the simple one day "Intro" course. Quite often that is all that you will need.

posted 01 March 2001 02:14 PM              

Thank you.

posted 02 March 2001 12:42 PM               

The easiest way I have found to calculate my uncertainty is to follow an example. You can find a very good example at http://www.nrc.ca/inms/mechmet/menu.html click on the orange document.

You can also ask an expert. I called my local registration authority in Canada and talked with a metrologist for about an hour. He laid out what factors may contribute to uncertainty of my specific tests.

posted 03 April 2001 04:46 PM              

quote:

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Originally posted by Benjamin:
Could someone please suggest source(s) for the training Mr. Wilde suggests?

Thank you.

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posted 05 April 2001 06:04 PM               

Look under "recent postings". There are $$$ and free documents and findings.

posted 24 May 2001 04:28 PM              

The class was well organized, inexpensive,and pragmatic; the instructor knowledgable -- Dr. Henrik S. Nielsen.

All examples came from the dimensional metrology world -- calipers, etc. He gives you a basic intuitive understanding of what uncertainty is and how to go about identifying uncertainty contributors and their distributions. He works through an example in class that is very detailed.

You will not come out an expert, but if you know and understand your instruments and measurement processes, you will get a good basic (notice that word again) understanding that will get you started towards calculating your own uncertainty budgets.

As a result of the class, I have a better understanding of many of the Cove discussions on uncertainty. The more calculations I do, the better I am getting. Hope the auditor agrees.

Also, he does a good job answering individual questions, so come armed. Speak up in class when you do not understand.