guard ring

(redirected from keeper ring)
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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 ?
In the late nineteenth century, for example, retailers introduced gold bands for girls that they labeled "sweet 16 rings." 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.
The cylindrical keeper ring works best, as opposed to the more cyclonic keeper ring on the L111, which Stange removes and replaces with either the keeper ring from a TroKar or an industry-standard ring like the Hitch Hiker Note that when the ring finally pulls free from the Magic Swimmer the first time, the nose can usually be trimmed back and the ring inserted at least one more time catch more fish.