I'm looking to find out the details on how RDC machine works to measure racket flex, and string stringbed stiffness. I understand the concept, I've seen the videos. But I want to know if :

Does the machine try to flex the racket/strings certain distance and it measures how much force it takes to do it? Or

Does the machine flexes the racket /strings with certain force and measures the distance the object flexed?

If one owns a machine there's an easy test to confirm : just use any racket and then a long wooden ruler (or anything significantly more flexible than a racket) , and see if the distance both objects move is the same or not.

Does the machine try to flex the racket/strings certain distance and it measures how much force it takes to do it? Or

Does the machine flexes the racket /strings with certain force and measures the distance the object flexed?

If one owns a machine there's an easy test to confirm : just use any racket and then a long wooden ruler (or anything significantly more flexible than a racket) , and see if the distance both objects move is the same or not.

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