guard-electrode system

guard-electrode system

[′gärd i¦lek‚trōd ‚sis·təm]
(petroleum engineering)
System of extra electrodes used during electrical logging of reservoir formations to confine the surveying current from the measuring electrode to a generally horizontal path.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.