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Previous set of "S" definitions and terms.
SELECTIVITY. The ability of a receiver to select the desired signal and reject unwanted signals.
SELENIUM. A chemical element with light-sensitive properties that makes it useful as a semiconductor
material in metallic rectifiers.
| SELF-BIAS. In a transistor circuit, the voltage developed across a resistor connected between the collector and base [Rb in the schematic]. In a vacuum tube circuit, the voltage developed by the flow of current through a resistor in the grid or cathode leads. |  Self-Bias |
SELF-EXCITED GENERATORS. DC generators in which the generator output is fed to the field to produce field excitation.
SELF-EXCITED METER. A term used to describe meters that operate from their own power sources.
SELF-INDUCTION. The production of a counter-electromotive force in a conductor when its own magnetic field collapses or expands with a change in current in the conductor. The phenomenon caused by the expanding and collapsing fields of an electron that encircle other electrons and retard the movement of the encircled electrons.
SENSE LINES. One or more lines running from a power supply to the load. The Sense Lines differ from the normal power supply output lines in that they supply no current. Sense Lines are used to read the voltage level at the load and adjust the output of the supply as required to maintain the correct voltage level. Sense Lines provide an accurate voltage reading because the lines do no incur a voltage drop due to the low current drain. Generally it is recommended to interconnect sense lines directly at the female connector to their respective power output terminals since sense lines in general may cause trouble.
SENSITIVITY. For an ammeter, the amount of current that will cause full-scale deflection of the meter. For a voltmeter, the ratio of the voltmeter resistance divided by the full-scale reading of the meter; expressed in ohms per volt. The ability of a receiver to reproduce very weak signals. The greater the receiver sensitivity, the weaker the signal that can be reproduced. Efficiency of a microphone. Describes microphone power delivered to a matched-impedance load as compared to the sound level being converted. Usually expressed in terms of the electrical power level.
SENSOR. A device, usually electronic, that extends man's natural senses by means of emitted or reflected energy. The energy may be nuclear, electromagnetic including the visible and invisible portions of the spectrum, chemical, biological, thermal, or mechanical. Related page; Sensor Manufacturers.
SERIES CIRCUIT. An arrangement where electrical devices are connected so that the total current must flow through all the devices; electrons have one path to travel from the negative terminal to the positive terminal.
SERIES-CONNECTED DUPLEXER. A configuration in which the tr spark gap is connected in series in one leg of the transmission line one-half wavelength away from the T-junction.
SERIES-DIODE DETECTOR. The semiconductor diode in series with the input voltage and the load impedance. Sometimes called a Voltage-Diode Detector.
SERIES-FED OSCILLATOR. An oscillator in which dc power is supplied to the amplifier through the tank circuit or a portion of the tank circuit.
SERIES LIMITER. A diode connected in series with the output, in which the output is taken across the resistor. Either the positive or negative alternation of the input wave is eliminated.
SERIES-NEGATIVE LIMITER. A diode connected in series with the output, in which the output is taken across the resistor. It eliminates the negative alternation of the input wave.
SERIES-PARALLEL CIRCUIT. A circuit that consists of both series and parallel networks.
Next page of "S" Terms and definitions
