Re: Verifying a standard with a standard
The accuracy ratios essentially increase your confidence in the results. If you have a 1 to 1 ratio, then you are almost flipping a coin.
http://www.transcat.com/PDF/TUR.pdf
This Transcat document does a pretty decent job of visually showing the value of obtaining high ratios.
I think you should write up a comparison ratio between the stated accuracy of the mictrac, and the required accuracy of the micrometers that you are assessing.
How long have you been using this verification process? Have you noticed any issues? Have your customers reported any failures?
While you do need to assure adequate ratios (gives more confidence in the results), it's more important to establish a measuring system that is valid, and one that will detect when you have a problem.
