| S |
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| Screening Effectiveness |
|
Ratio of the power fed into a coaxial cable to the power transmitted
by the cable through the outer conductor. |
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| Screw machine contact |
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A contact which is machined from solid bar stock |
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| Semi-Rigid |
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A cable containing a flexible inner core and a relatively
inflexible sheathing. |
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| Shield |
|
(1) A conducting housing or screen that substantially reduces
the effect of electric or magnetic fields on one side thereof,
upon devices or circuits on the other side. Cable shields may
be solid, braided, or taped (longitudinally or spirally).
(2) In cables, a metallic layer placed around a conductor or
group of conductors to prevent electrostatic or electromagnetic
interface between the enclosed wires and external fields. |
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| Shield Effectiveness |
|
The relative ability of a shield to screen out undesirable
interference. Frequently confused with the term shield coverage. |
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| Shielding |
|
The metal sleeving surrounding one or more of the conductors,
in a wire circuit to prevent interference, interaction or current
leakage. |
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| Shock (mechanical) |
|
(1) An abrupt impact applied to a stationary object.
(2) An abrupt or non-periodic change in position, characterized
by suddenness,
and by the development of substantial internal forces. |
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| Signal |
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Any visible or audible indication which can convey information.
Also, the information conveyed through a communication system. |
|
| Silicone |
|
General Electric trademark for a material made from silicone
and oxygen.
Can be in thermosetting elastomer or liquid form. The thermosetting
elastomer form is noted for high heat resistance. |
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| Skin Effect |
|
The phenomenon wherein the depth of penetration of electric
currents into a conductor decreases as the frequency of the
current increases. |
|
| SMA (Subminiature A) |
|
50‰-Subminiature coaxial connector with screw type coupling
mechanism.
Frequency range DC-18㎓. |
|
| SMB (Subminiature B) |
|
Subminiature coaxial connector with snap-on coupling mechanism.
Frequency range DC-4㎓. |
|
| SMC (Subminiature C) |
|
Subminiature coaxial connector with screw type coupling mechanism.
Frequency range DC-10㎓. |
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| Snap-on |
|
Used to describe the easy removal or assembly of one part
to another. A connector containing socket contacts into which
a plug connector having male contacts is inserted. |
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| Solder Contact |
|
A contact or terminal having a cup, hollow cylinder, eyelet
or hook to accept a wire for a conventional soldered termination. |
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| Source |
|
The device (usually LED or laser) used to convert an electrical
informationcarrying signal into a corresponding optical signal
for transmission by an optical wave guide.) |
|
| Spectrum |
|
Frequencies that exist in a continuous range and have a common
characteristic.
A spectrum may be inclusive of many spectrums (e.g., the electromagnetic
radiation spectrum includes the light spectrum, radio spectrum,
infrared spectrum, etc.). |
|
| Speed of Light (c) |
|
2.998 × 108 meters per second. |
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| Standing Wave |
|
The stationary pattern of waves produced by two waves of the
same frequency traveling in opposite directions on the same
transmission line. The existence of voltage and current maxima
and minima along a transmission line is a result of reflected
energy from an impedance mismatch. |
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| Standing Wave Ratio (SWR) |
|
A ratio of the minimum amplitude to the minimum amplitude
of a standing wave stated in current or voltage amplitudes. |
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| Stripline |
|
A type of transmission line configuration which consists of
a single narrow conductor
parallel and equidistant to two parallel ground planes. |
|
| SUCOPLATEⓡ |
|
A plating material made our of a combination of copper, fin
and zinc. Good corrosion and abrasion resistance. Non magnetic.
Registered mark of HUBER + SUHNER AG. |
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Surface Mount Device
(SMD) |
|
An active or passive device designed to be soldered to the
surface of the printed circuit board. |
|
Surface Mount Technology
(SMT) |
|
The process of assembling printed circuit boards with components
soldered to the surface rather than to plated through-holes. |
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| Surge |
|
A temporary and relatively large increase in the voltage or
current in an electric or cable. Also called transient. |
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