Quantcast Appendix I Glossary - Cont'd -141210122
 

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SERVO AMPLIFIER­ Either ac or dc amplifiers used
POWER SUPPLY­ A module that converts the
in servo systems to build up signal strength. These
115-volt 60-hertz incoming power to ac or dc power
amplifiers usually have relatively flat gain versus
at a more suitable voltage level.
frequency response, minimum phase shift, low
PRINTED CIRCUIT BOARD­ Devices usually
output impedance, and low noise level.
plugged into receptacles that are mounted in
modules.
SERVO SYSTEM­ An ac or dc motor used in servo
systems to move a load to a desired position or at a
PRIORITY­ Order established by relative importance
desired speed. The ac motor is usually used to drive
of the function.
light loads at a constant speed, while the dc motor
PROTECTIVE FEATURE­ Feature of a component
is used to drive heavy loads at varying speeds.
or component part designed to protect a component
SET POINT­ Numerical value of a parameter at which
or system from damage.
an alarm is actuated.
RECEIVER­ (1) The object that responds to the wave
SIGNAL­ A general term used to describe any ac or dc
or disturbance. Same as DETECTOR. (2) Equip-
of interest in a circuit; for example, input signal.
ment that converts electromagnetic energy into a
visible or an audible form. (3) In radar, a unit that
SILICON CONTROLLED RECTIFIER PACK-
converts rf echoes to video and/or audio signals.
AGE­ A device that furnishes controlled dc power
to a device.
REFERENCE POINT­ A point in a circuit to which all
other points in the circuit are compared.
SINE WAVE­ (1) The curve traced by the projection on
a uniform time scale of the end of a rotating arm, or
REFERENCE SIGNAL­ Command signal that
vector. Also known as a sinusoidal wave. (2) The
requests a specific final condition.
basic synchronous alternating waveform for all
RELAY­ An electromagnetic device with one or more
complex waveforms.
sets of contacts that change position by the magnetic
SOLID STATE­ Class of electronics components, such
attraction of a coil to an armature.
as transistors, diodes, integrated circuits, silicon
ROTOR­ The rotating member of a synchro that
controlled rectifiers, and so forth.
consists of one or more coils of wire wound on a
laminated core. Depending on the type of synchro,
SPAN­ Distance between two points.
the rotor functions similar to the primary or
SPECIAL FUNCTION­ Unique service performed by
secondary winding of a transformer.
a system; usually above and beyond the direct
SCALING­ Applying a factor of proportionality to data
designed intent of the system.
or signal levels.
STANDARD PRINT­ Standard drawing, schematic, or
SCAT CODE­ The subcategory (SCAT) code assigned
blueprint produced in the applicable technical
to the equipment, if applicable.
manual or other official technical publication.
SEB NUMBER­ The number of the support equipment
STATOR­ The stationary member of a synchro that
change that contains the modification implemented
consists of a cylindrical structure of slotted
on the corresponding equipment by the related
laminations on which three Y-connected coils are
calibration activity (laboratory).
wound with their axes 120° apart. Depending on the
type of synchro, the stator's functions are similar to
SELSYN­ Self-synchronizing device or synchromotor.
the primary or secondary windings of a transformer.
SENSING POINT­ Physical and/or functional point in
STATUS LOG­ Record of the instantaneous values of
a system at which a signal may be detected or
important conditions having analog values.
monitored in an automatic operation.
SUBASSEMBLY­ Consists of two or more parts that
SENSOR­ A device that is sensitive to temperature,
form a portion of an assembly or a unit.
pressure, position, level, or speed.
SWITCH­ (1) A device used to connect, disconnect, or
SERVICING LABEL (SL)­ A label attached to the
change the connections in an electrical circuit. (2)
equipment to indicate the status of the equipment
A device used to open or close a circuit.
after servicing.
AI-4

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