Funkel effect

Funkel effect

[′fəŋ·kəl i‚fekt]
(electronics)
Fluctuations in the current from an oxide cathode, or any cathode that does not consist of pure metal, due to fluctuations in the work function resulting from changes with time in the cathode surface.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.