holding beam

holding beam

[′hōl·diŋ ‚bēm]
(electronics)
A diffused beam of electrons used to regenerate the charges stored on the dielectric surface of a cathode-ray storage tube.
References in periodicals archive ?
For doors with electronic holding beams, cover the beam and stand motionless to make sure the door remains open.
For doors with electronic sensors and holding beams, perform tests standing upright as well as in a crouch position.