Neets Master Glossary

1-65 ROTOR—(1) The revolving part of a rotating electrical machine. The rotor may be either the field or the armature, depending on the design of the machine [5]. (2) The rotating member of a synchro that consists of one or more coils of wire wound on a laminated core. Depending on the type of synchro, the rotor functions similarly to the primary or secondary winding of a transformer [15]. RPK—The symbol used to represent the resistance between the cathode and plate of a tube [6]. RUNNING OPEN—The teletypewriter condition where the type hammer constantly strikes the type box but does not print or move across the page [17]. SATELLITE ECLIPSE—An eclipse where the rays of the sun do not reach the satellite. This prevents recharging of the solar cells of the satellite and decreases the power to the transmitter [17]. SATELLITE-SUN CONJUNCTION—A period when the satellite and sun are close together and the noise from the sun prevents or hampers communications [17]. SATURABLE-CORE REACTOR—A coil in which the reactance is controlled by changing the permeability of the core [8]. SATURATION—(1) The condition existing in any circuit in which an increase in the input signal produces no further change in the output [13]. (2) The operating point of a vacuum tube or transistor at which a further increase in grid or base current no longer produces an increase in plate or collector current [6] [7]. (3) In a magnetic core, the condition in which a magnetic material has reached a maximum flux density and the permeability has decreased to a value of (approximately) 1 [8]. SCALING FACTOR—The term used to describe the use of unequal resistors in a servo's summing network to compensate for differences between input and output signal levels [15]. SCANNING—(1) The process of subdividing a picture in an orderly manner into segments. This is used in facsimile transmission [17]. (2) Systematic movement of a radar beam to cover a definite pattern or area in space [18]. SCAT CODE—A four-digit subcategory code used to identify the functional measurement parameters that can be satisfied by any one of many pieces of test equipment [16]. SCATTER ANGLE—The angle at which the receiving antenna must be aimed to capture the scattered energy of tropospheric scatter [10]. SCHEMATIC—A diagram which shows, by means of graphic symbols, the electrical connections and functions of a specific circuit arrangement [1] [4]. SCHEMATIC SYMBOLS—A letter, abbreviation, or design used to represent specific characteristics or components on a schematic diagram [1]. SCINTILLATION—Apparent change in target reflectivity. Motion of the target causes successive radar pulses to bounce off different parts of the target, such as fuselage and wingtip [18]. SCREEN GRID—A grid placed between a control grid and the plate and usually maintained at a fixed positive potential [6]. SCREENING—Process of applying nonconductive or semiconductive materials to a substrate to form thick film components [14].