guard ring

(redirected from keeper ring)
Also found in: Dictionary.

guard ring

[′gärd ‚riŋ]
(electricity)
A ring-shaped auxiliary electrode surrounding one of the plates of a parallel-plate capacitor to reduce edge effects.
(electronics)
A ring-shaped auxiliary electrode used in an electron tube or other device to modify the electric field or reduce insulator leakage; in a counter tube or ionization chamber a guard ring may also serve to define the sensitive volume.
(thermodynamics)
A device used in heat flow experiments to ensure an even distribution of heat, consisting of a ring that surrounds the specimen and is made of a similar material.
References in periodicals archive ?
Manufacturer and retail catalogs also featured the guard or keeper ring, a plain slim gold band worn over the diamond ring to keep it in place.
Or if none of those things, then it was probably the tail--how it hung down from my rod's keeper ring like a winsome piece of whole-wheat spaghetti.