proving ring

proving ring

[′prüv·iŋ ‚riŋ]
(design engineering)
A ring used for calibrating test machines; the diameter of the ring changes when a force is applied along a diameter.
References in periodicals archive ?
Typical examples are mechanical systems, such as the micrometer screw and precisely machined contact points that are integrated within proving ring transducers, and electrical voltage-ratio measuring instruments supplied by customers for connection to strain gauge load cells.