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S

SWITCH

(1) A device used to connect, disconnect, or change the connections in an electrical circuit [1]. (2) A device used to open or close a circuit [3].


SWR

(SWR)—The ratio of the maximum (voltage, current) to the minimum
(voltage, current) points of a transmission line. Indicates the impedance matching quality of the termination of the line [10] [11].


SYMPTOM ELABORATION

Using built-in indicating instruments or other aids to define equipment
malfunction [16].


SYMPTOM RECOGNITION

Recognition of a situation in equipment operation that is not normal [16].

SYNCHRO

A small motorlike analog device that operates like a variable transformer and is used primarily for the rapid and accurate transmission of data among equipments and stations [15].


SYNCHRO CAPACITOR

A unit containing three delta-connected capacitors. The synchro capacitor is
used in synchro systems to increase the system's accuracy by cancelling or reducing the phase shift introduced by synchro inductance [15].


SYNCHRO SYSTEM

Two or more synchros interconnected electrically. The system is used to transmit data among equipments and stations [15].


SYNCHRO TESTER

A synchro receiver with a calibrated dial. This receiver is used primarily for
locating defective synchros. It can also be used for zeroing synchros [15].


SYNCHRONIZER

A circuit that supplies timing signals to other radar components [18].

SYNCHRONIZING NETWORK

A circuit, also called a crossover or switching network, used in servosystems to sense how far the load is from the point of correspondence; it then functions to switch the appropriate signal into control [15].



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