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Hello all,
I've been searching the forum for two hours and was not able to find a similar topic. So, this is the problem:
Our laboratory had a primary (certified) reference material for a few years. It was bought at and traceable to NPL (UK). As the old one was coming to it's end, recently we bought a new one, also traceble to NPL.
When we compared the two standards in our laboratory, they showed a few percent difference between them.
The difference is bigger than the uncertainty stated on the certification of the CRM.
We also participated in inter-laboratory comparison measurements with the old CRM, so we don't think it is off.
If we start using the new standard as it is, we will face a significant few percent step in our measurements.
Any thought and suggestions, please.
I've been searching the forum for two hours and was not able to find a similar topic. So, this is the problem:
Our laboratory had a primary (certified) reference material for a few years. It was bought at and traceable to NPL (UK). As the old one was coming to it's end, recently we bought a new one, also traceble to NPL.
When we compared the two standards in our laboratory, they showed a few percent difference between them.
The difference is bigger than the uncertainty stated on the certification of the CRM.
We also participated in inter-laboratory comparison measurements with the old CRM, so we don't think it is off.
If we start using the new standard as it is, we will face a significant few percent step in our measurements.
Any thought and suggestions, please.