What is Metrological Traceability - Requirements Traceability and Calibration

In this episode of the Metrology Training Lab where we demonstrate how to calibrate, we are going to talk about requirements traceability, or sometimes called metrological traceability.
Here’s the question that traceability and calibration answers - say I make a measurement with this caliper. How do I know that the inches or millimeters on this caliper are the same as everybody else’s inches or millimeters? How do I relate this measurement back to some defined standard, like the definition of the meter?
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[@timthompson468]

Great video. I wonder what they used to measure the original meter, and the copies. That must have taken a considerable effort in the days before laser interferometers. Of course, then there’s the question of how one measures the distance from the North Pole to the Equator? Might make for some fun Sunday evening internet research. I’m glad someone else figured that one out though.

[@dr.jimsalsbury695]

I highly recommend the book "The Measure of All Things" by Ken Alder. It's a good read about the two scientists who did the earth circumference measurement in the late 1700's. The meter bars were measured on a line scale comparator (they were not end standards, but rather had etched lines). Mitutoyo's museum in our headquarters in Japan has one - it's pretty cool. Thanks for the comments.

[@timthompson468]

Jim Salsbury Thanks. That looks like a good book. I have a copy on order. I saw it mentioned on the Wikipedia page. There it was mentioned that it was.a seven year expedition to make the measurement that led to the value for the earth’s circumference. I love the tenacity of the pioneers in science and metrology in those days. They wouldn’t hesitate to tackle problems that took decades, or sometimes multiple lifetimes to solve. I guess that still happens today, but the results of today’s science are not as satisfying to me. It seems in the Newtonian days, the physics was much more useful to the common man.

[@AndyKingsmill]

Well done! Great set of videos Mitutoyo!

[@swaraj1501]

Awesome its very helpful...Thanks from INDIA 🇮🇳

[@MitutoyoAmerica]

Glad it was helpful!

[@akshaybagal4029]

Sir please if possible make a video on a best way to handle vernier caliper & micrometer.

[@MitutoyoAmerica]

Hello, we have a few videos for both the Vernier Calipers and Vernier Micrometers.
For our Vernier Calipers, we have the video "Vernier Caliper Use from Mitutoyo" which will show you how to use one.
ua-cam.com/video/JVufKApcscI/v-deo.html
We also have a video "How to Read Vernier Calipers in Inches" which will show you how to read out your measurements.
ua-cam.com/video/kOhVFZDPITE/v-deo.html
For our Vernier Micrometers, we have the video "How to - Use a Vernier Micrometer - Mitutoyo America" which will show you how to use one.
ua-cam.com/video/uvWXsFegiYc/v-deo.html
We also have a video "How to Read a Vernier Micrometer (how to use a Mitutoyo micrometer)" which will show you how to read out your measurements.
ua-cam.com/video/Bkh4a9HR7kY/v-deo.html
We hope these help, and please let us know if you have any further questions.

[@hughmac13]

Jim, just out of curiosity how often do you send your masters to NIST and how often do you check your working masters? BTW I read all the metrology publications you guys put out.

[@bekanav]

Actually meter wasn't based on circumference of the Earth but distance from equator to north pole. One tenth millionth part of that was decided to be one meter. So distance is 10 000km.

[@dr.jimsalsbury695]

I think we are both right. It was from the circumferential distance from the equator to north pole, based on a measurement of the circumference of the Earth from the north to south of France in the late 1700's.

[@engelbob8402]

You sold me

[@apurvakhartad191]

Thank you sir for the wonderful session.

[@m.sabir21]

Thanks for the excellent explanation, but i do not agree with your statement in last minutes of the video that lower CMC means lab can measure accurately.

[@clementugoani6717]

Thanks a lot for this. Apt explanation

[@israelbarrios1549]

Excellent thank you

[@fuadsaeed9856]

an amazing knowledge carrying for more elaboration please any pdf references

[@aion2177]

oh wow.. interesting.. :)

[@warplanner8852]

ZZZZZZZZZZzzzzzzzzz......

[@clayz1]

I want to see you in the front of the class from now on.