Neets Master Glossary

1-23 ELECTRONIC COUNTER-COUNTERMEASURES (ECCM) CIRCUITS—See ANTIJAMMING CIRCUITS [18]. ELECTRONIC-EQUIPMENT DEHYDRATOR—A device that provides an alternate dry-air input in the event of failure of the central dry-air system. It may include a compressor [18]. ELECTRONIC FREQUENCY COUNTER—An instrument that counts the number of cycles (pulses) occurring during a precise time interval [18]. ELECTRONIC SCANNING—Scanning in which the axis of the beam is moved, relative to the antenna axis, in a desired pattern [18]. ELECTRONIC SWITCH—A circuit that causes a start-and-stop switching action by electronic means [13]. ELECTRONICS DRY-AIR BRANCH—A common line for providing dry air to various electronic equipment, such as search radar, fire-control radar, and repeaters [18]. ELECTRONIC TUNING—In a reflex klystron, changing the frequency and output power of the tube by altering the repeller voltage [11]. ELECTRON SPIN—The movement of an electron around its axis [11]. ELECTROSTATIC—Pertaining to electricity at rest, such as charges on an object (static electricity) [1]. ELECTROSTATIC DEFLECTION—The method of deflecting an electron beam by passing it between parallel charged plates mounted inside a cathode-ray tube [6]. ELECTROSTATIC FIELD—The field of influence between two differently charged bodies [2]. ELECTROSTATIC METER MOVEMENT—A meter movement that uses the electrostatic repulsion of two sets of charged plates (one fixed and the other movable). This meter movement reacts to voltage rather than to current and is used to measure high voltage [3]. ELECTROSTATIC STRESS—The force exerted on an insulator by the voltage in a conductor [4]. ELEMENT—(1) A substance, in chemistry, that cannot be divided into simpler substances by any means ordinarily available [1]. (2) A part of an antenna that can be either an active radiator or a parasitic radiator [10]. ELEPHANT TRUNK—Ducting used for ventilation purposes [4]. ELEVATION ANGLE—The angle between the horizontal plane and the line of sight to a target or object [11] [18]. EMERGENCY POWER—Temporary source of limited electrical power used upon the loss of the normal power source [18]. EMF (ELECTROMOTIVE FORCE)—The force that causes electricity to flow between two points with different electrical charges or when there is a difference of potential between the two points. The unit of measurement is volts [1]. EMITTER—The element in a transistor that emits current carriers (electrons or holes) [7] [13].