envelope principle

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New Member
I wish you could help me.
I am translating a measuring strategies cookbook and I amb not able to understand the meaning of "envelope principle".

Here is the context I have:
*** Check diameter with envelope principle according to ISO 8015 and ISO 14405.***
***Create the characteristic(s) "2-Point-Size" with id extension "R100DE-F", check "ISO 8015" or "Envelope", add circle into characteristic, projected in upper face.***
Thanks in advance!
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