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S

SERIES-PARALLEL CIRCUIT

A circuit that consists of both series and parallel networks [1] [9].

SERIES-POSITIVE LIMITER

A diode connected in series with the output, in which the output is taken
across a resistor. It eliminates the positive alternation of the input wave [9].


SERIES-RESONANT CIRCUIT

A resonant circuit in which the source voltage is connected in series with a capacitor and an inductor (also in series) to furnish a low impedance at the frequency at which the circuit is resonant [9] [10].


SERIES-WOUND MOTORS AND GENERATORS

Machines in which the armature and field windings are connected in series with each other [5].


SERVOAMPLIFIER

Either ac or dc amplifiers used in servosystems to build up signal strength. These amplifiers usually have relatively flat gain versus frequency response, minimum phase shift, low output impedance, and low noise level [15].


SERVOMOTOR

An ac or dc motor used in servosystems to move a load to a desired position or at a desired speed. The ac motor is usually used to drive light loads at a constant speed, while the dc motor is used to drive heavy loads at varying speeds [15].


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].



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