J
An easy way to remember TS16949 for the labs is that if you go outside, the lab should be ISO 17025 sometimes slang as Guide 25 or A2LA or the OEM of the device if no other services are available.
The loophole is if you do it in house. Then you don’t need 17025. What you do need though is to have the calibration of that type item listed on your own Lab Scope, defined methodology and (NIST) traceable tools for checking that type item that takes into consideration: acceptance criteria, linearity, stability & bias.
While the 1:10 ratio is a rule of thumb it basically is just saying that you want your checking tool to be 10x’s more accurate that what it is being used to check. Can you go with a lesser amount…sure. Just realize that it directly goes back to your measurement error
The loophole is if you do it in house. Then you don’t need 17025. What you do need though is to have the calibration of that type item listed on your own Lab Scope, defined methodology and (NIST) traceable tools for checking that type item that takes into consideration: acceptance criteria, linearity, stability & bias.
While the 1:10 ratio is a rule of thumb it basically is just saying that you want your checking tool to be 10x’s more accurate that what it is being used to check. Can you go with a lesser amount…sure. Just realize that it directly goes back to your measurement error
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