"A"
"B"
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
Previous set of "S" definitions and terms.
SLIP. The difference between rotor speed and synchronous speed in an ac induction motor.
SLIP RINGS. Contacts that are mounted on the shaft of a motor or generator to which the rotor windings
are connected and against which the brushes ride. Devices for making electric connections between
stationary and rotating contacts.
SLOPE DETECTOR. A tank circuit tuned to a frequency, either slightly above or below an FM carrier
frequency, that is used to detect intelligence.
SLOT. Narrow opening in a waveguide wall used to couple energy in or out of the waveguide. Also called
an aperture or a window.
SNAP-ACTING. Changing position quickly with the aid of a spring.
SOFT-ERROR. A data error which can be corrected by attempting to re-read or re-writing the data.
SOLDER-CUP. A type of connector pin with a cup on one end to accept a wire and solder as a connection point. [graphic lower right]
SOLDER SLEEVE. A heat-shrinkable solder termination device with meltable sealing preforms at
ends.
SOLENOID. An electro-magnetic device that changes electrical energy into mechanical motion; based
upon the attraction of a movable iron plunger to the core of an electromagnet.
SOLID. One of the three states of matter; it has definite volume and shape.
SOLID-STATE DEVICE. An electronic device that operates by the movement of elections within a solid
piece of semiconductor material.
SOLID-STATE LIGHTING. SSL is an umbrella term encompassing both light-emitting diodes (LEDs) and organic light emitting diodes (OLEDs). [read more about SSL].
SONIC. Pertaining to sounds capable of being heard by the human ear.
SOURCE. The object that produces the waves or disturbance. The name given to them end of a
two-wire transmission line that is connected to a source. The device which furnishes the
electrical energy used by a load.
SOURCE CURRENT. An integrated circuit sources current when current is flowing from the IC into another device [Load]. Source-ing current is considered to be positive current flow from the ICs prospective. Source current is the opposite to Sink Current.
SPACE. Absence of an RF signal in cw keying. Key-open condition or lack of data in communications
systems. Also a period of no signal.
SPACE CHARGE. An electrical charge distributed throughout a volume or space.
SPACE DIVERSITY. Reception of radio waves by two or more antennas spaced some distance apart.
SPACE WAVE. Radio waves that travel directly from the transmitter to the receiver and remain in the
troposphere.
SPARK-GAP MODULATOR. A modulator that consists of a circuit for storing energy, a circuit for
rapidly discharging the storage circuit (spark gap), a pulse transformer, and a power source.
SPEAKER. A device that radiates acoustic energy into the air. More detail; Speaker Types
Speaker System
SPECIFIC GRAVITY. The ratio between the density of a substance and that of pure water at a given temperature.
SPECIFIC RESISTANCE. The resistance measured in ohms of a unit volume of a substance to the flow of electric current. (The unit volume used is generally the circular mil-foot.)
SPECTRUM. The entire range of electromagnetic waves arranged in order of their frequencies. The range of frequencies considered in a system. The range of electromagnetic radio frequencies used in the transmission of sound, data and television [TV].
SPECTRUM ANALYSIS. The display of electromagnetic energy arranged according to wavelength or frequency.
Spectrum Analyzer
SPECTRUM ANALYZER. A test instrument that provides a visual display of the frequency distribution of an RF signal such as a transmitter output. Refer here for Manufacturers of Spectrum Analyers.
Next set of "S" Terms and definitions
