Testing Laboratory Scope

Douglas E. Purdy

Quite Involved in Discussions
#1
This is really showing my ignorance, but while reviewing a couple different scopes for Testing Laboratories and Calibration Labortories, I only observed Best Measurements with the latter. How does Measurement Uncertainties play with Testing Labortories and why does it appear that Best Measurements do not apply to testing?

Thanks to those who will not scoff at me!
 
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Douglas E. Purdy

Quite Involved in Discussions
#2
Wow! Nearly 6 Weeks and no replies

The readers of this forum must really be polite! Nearly six weeks and no replies. I am not going to learn anything that way. So I will take any ridicule you want to give me.

Thanks,
Doug
 

CarolX

Super Moderator
Super Moderator
#3
Douglas E. Purdy said:
Nearly six weeks and no replies
Well, that's just not right, is it. :eek:

Unfortunately, I don't know the answer to your question. Perhaps you could give a little more detail...maybe some of us can help you out.

CarolX
 

howste

Thaumaturge
Super Moderator
#4
Douglas E. Purdy said:
...I will take any ridicule you want to give me...
Ok, you're ugly and your mother dresses you funny. :eek:

Sorry, but like CarolX I haven't got a good answer about what you're asking. I'm always ready with ridicule though...
 
#5
You asked for it!

For pete's sake, don't you know anything, Doug? ;) (Sorry, I'm jonesing without the Political Forum).
I got this from the NIST website:
(http://www.ts.nist.gov/ts/htdocs/210/214/assessors/traceability-references/sld003.htm)
Best measurement capability [is the] Smallest uncertainty of measurement a laboratory can achieve within its scope of accreditation, when performing more-or-less routine calibrations of nearly ideal measurement standards intended to define, realize, conserve or reproduce a unit of that quantity or one or more of its values, or when performing more-or-less routine calibrations of nearly ideal measuring instruments designed for the measurement of that quantity.

Here's a nice guide from NIST on measurement uncertainty.
http://physics.nist.gov/Document/tn1297.pdf

IMO, the difference is a cal lab can attract more business or charge more by spending money to reduce their uncertainty to infinitesimal levels, whereas a test lab just needs to reduce their uncertainty to a level that gives them the capability to measure within customer specified tolerance, reducing uncertainty further does not add value.
 
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