ISO 17025 - Please share a sample procedure for monitoring the validity of results

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dwperron

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#2
This is now a two part process.
Part one is the internal process. How can you be sure you are getting valid results? In 7.7.1 they give a long list of possible solutions, choose whatever ones work best for your lab.

Most labs already have a cross check program, where you bump one one of your standards against another (5520A against a 3458A) and record (and chart the results, assessors really like this!) the results. You can see when the results drift, and can act to determine and fix problems while they are still small. Record your results, document your methods.
You can perform the same calibration with different instruments to see if you get the same results. - Document the records.
You send something out for calibration? See if you can duplicate those results when it gets back.

Part two is proficiency testing. That pretty much is the same as it used to be.
You need a program where you do proficiency testing on each discipline in your scope of accreditation, or you get involved in interlaboratory comparisons (round robins). The idea is to compare your results with somebody else's.
All this needs to be documented, and your accreditation body will have their own requirements as to how this gets done, so check with them.
 
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