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Neets Master Glossary - 14192_77
Neets Master Glossary - 14192_79

Neets Module 20-Master Glossary
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1-68 SERVOSYSTEM—An automatic feedback control system that compares a required condition (desired value, position, and so forth) with an actual condition and uses the difference to drive a control device to achieve the required condition [15]. SET—A unit or units and the assemblies, subassemblies, and parts connected or associated together to perform a specific function [17]. SEXADECIMAL—Same as HEXADECIMAL [13]. SHADOW—A dead spot (minimum radiation) caused by the physical obstruction of transmitted waves by a feed horn [18]. SHAPING CIRCUIT—A circuit that alters the shapes of input waveforms [9]. SHARP-CUTOFF TUBE—The opposite of a remote-cutoff tube. An electron tube that has evenly spaced grid wires. The amplification of the sharp-cutoff tube is limited by the bias voltage and tube characteristics [6]. SHELF LIFE—The period of time that a cell or battery may be stored and still be useful [1]. SHIELDED PAIR—A line consisting of parallel conductors separated from each other and surrounded by a solid dielectric [10]. SHIELDING—(1) A metallic covering used to prevent magnetic or electromagnetic fields from affecting an object [1]. (2) Technique designed to minimize internal and external interference [14]. SHORT CIRCUIT—An unintentional current path between two components in a circuit or between a component and ground; usually caused by a circuit malfunction [1] [3] [16]. SHORT-CIRCUITED LINE—A transmission line that has a terminating impedance equal to 0 [10]. SHUNT—A resistive device placed in parallel with another component. Appreciable current may flow through it and an appreciable voltage may exist across it [12]. SHUNT-DIODE DETECTOR—A diode detector in which the diode is in parallel with the input voltage and the load impedance. Also known as a current detector because it operates with smaller input levels [12]. SHUNT-FED OSCILLATOR—An oscillator that receives its dc power for the transistor or tube through a path both separate from and parallel to the tank circuit [9]. SHUNT PEAKING—A technique used to improve high-frequency response in which a peaking coil is placed in parallel (shunt) with the output signal path [8]. SHUNT RESISTOR—A resistor in parallel. In an ammeter, shunt resistors are used to provide multiple ranges [3]. SHUNT VOLTAGE REGULATOR—A regulator whose regulating device is in parallel with the load resistance [7]. SHUNT-WOUND MOTORS AND GENERATORS—Machines in which the armature and field windings are connected in parallel (shunt) with each other [5]. SIEMENS—The new and preferred term for MHO [1].






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