Dose 2016

GUM

How to know the “true value”?

Answer:

Obviously one must define more exactly the influence factors for the quantity to be measured !

Question:

Can we fix all measuring conditions?

Answer:

In principle, the quantity to be measured cannot be completely described without an infinite amount of information. If it is impossible to define all conditions, the "true value" must ultimately remain unknown

Consequence:

If the true value remains unknown, the value of an " error " and even worse, also that of " accuracy “ can not be exactly evaluated and therefore also must remain unknown.

5.2

19