Length Measure - Interpreting Calibration Results and Measurement Uncertainty (MU)

B

bearvn

#1
Hi all,
I have a caliper whose has been calibrated by a competance Lab. The result is as below:
Reference: 120.00mm, UUC: 119.96mm +/-0.02mm (MU)
Reference: 170.00mm, UUC: 169.98mm +/-0.02mm (MU)
Reference: 270.00mm, UUC: 269.99mm +/-0.02mm (MU)
Question:
If I use this caliper to check whether the dimension of a rectangular object meet requirement of 150 .0mm +/-0.1mm and the indication shows 150.00, then should I apply any correction to the result? How to calculate uncertainty of the correction?
 
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Stijloor

Staff member
Super Moderator
#2
Re: Length Measure - Interpreting Calibration Results and Measurement Uncertainty (MU

A Quick Bump!

Can someone help?

Thank you very much!!

Stijloor.
 

Hershal

Metrologist-Auditor
Staff member
Super Moderator
#3
Re: Length Measure - Interpreting Calibration Results and Measurement Uncertainty (MU

First thing, calibration uncertainty, and the uncertainty you will actually have in use are NOT the same.

The uncertainty reported for the calibration is normal at 95% confidence, so it is a divisor of 2 in YOUR uncertainty calculation.

You must develop your Type A, and consider the other Type B influences before the final calculation.

NOW, we get to your true question. You have actual readings with uncertainty so you can make the necessary corrections. Then you can calculate uncertainty. Don't forget to include some value in the uncertainty calculation for the measurement correction.

Your uncertainty will be higher. If the customer does not require the uncertainty, then calculate it, record it, and do not report it.

Hope this helps.
 

blueicecube2

Involved In Discussions
#4
Re: Length Measure - Interpreting Calibration Results and Measurement Uncertainty (MU

I am merely a simple user.

For your application, where the accuracy required is 10 times more than the measuring instrument's resolution AND the calibration result is within the equipment's specification AND the measurement uncertainty is small enough (I want to use the word TUR, but I just started reading it about it..),

you can use the reading from the measuring instrument directly :_)
 
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