Reporting measurement uncertainty for custom items

greif

Involved In Discussions
#1
We typically use microscopes to locate the edge of images to determine size. These might be moving microscopes on a CMM, or fixed short distance like filar type eyepieces. Most of the time we measure chrome on glass images (very thin evaporated chromium on a glass substrate) and have well characterized uncertainties for measuring to this type of edge.

My question is: when a customer sends in another type of material (such as images on photo film, or photo paper) , we do not have an uncertainty for that specific material. What is normally done in such a case? Would it be reasonable to have one operator (the tech doing the measurement) measure a feature 10 times and use the std dev from that in the uncertainty calc to determine the k=2 uncertainty for that specific measurement? Or does it need to be more extensive?
 
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dwperron

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#2
It would be similar to the uncertainty budget you are already using. Yes, finding the standard deviation would give you a Type A contributor for repeatability. You will still need to include the usual suspects: your measuring device's accuracy, its calibration uncertainty, resolution, environmental contributors, etc.
 

greif

Involved In Discussions
#3
Oh good- simpler than I thought it might be. Thought maybe an R&R and multiple users might be standard for this sort of thing.
 
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