18WuD2x

412 link circuit • liquid-pressure alarm
link circuit A closed-loop coupling circuit having
two coils of a few turns of wire; each coil is placed
near one of the circuits to be coupled.
link coupling Low-impedance coupling via a small
(usually one-turn) input or output coil fed by a
twisted pair or a coaxial line.
Back glass
and polarizer
Sealed-in
fluid
Input
C1 L1 L2 C2
Output
Front glass
and
polarizer
link coupling
linked subroutine A subroutine, entered by a
branch instruction from a main routine, that executes
a branch instruction returning control to
the main routine.
link fuse A fuse consisting of an exposed length of
fuse wire.
link neutralization Neutralization achieved by
out-of-phase current fed back via link coupling
from the output to the input of an amplifier. Also
called INDUCTIVE NEUTRALIZATION.
lin-log receiver A radar receiver whose amplitude
response is linear for small signals, but logarithmic
for large ones.
lip microphone A small microphone operated
close to or in contact with the lips.
liquid A state of matter characterized by a level of
molecular motion intermediate between that of
gases and solids; liquids have the ability (like
gases) to take the shape of a container and are only
slightly compressible. Compare GAS, PLASMA,
and SOLID. Also see STATE OF MATTER.
liquid absorption For a solid material, such as dielectric,
the ratio of the weight of liquid absorbed
by the material to the weight of the material.
liquid capacitor See WATER CAPACITOR.
liquid cell See ELECTROLYTIC CELL.
liquid conductor See ELECTROLYTE.
liquid cooling Use of circulating water, oil, or
other fluid to remove heat from components or
equipment, such as microprocessors or power
amplifiers.
liquid crystal A liquid exhibiting some of the characteristics
of a crystal. Also see NEMATIC CRYS-
TAL and SMECTIC CRYSTAL.
liquid-crystal display Abbreviation, LCD. A flatpanel
display noted for its thin profile, light
weight, and low power consumption. The simplest
devices are used in calculators, meters,
wristwatches, and radios. More sophisticated
displays are used in computers and portable
video units. This type of display can operate at a
much lower voltage than a cathode-ray tube
(CRT). This makes it ideal for portable electronic
systems in which batteries are used. Older
displays of this type can be difficult to read from
certain viewing angles. This situation has
liquid-crystal display
improved in recent years with the advent of
active-matrix, also known as thin-film-transistor
(TFT), displays.
liquid-filled transformer A transformer filled with
a protective liquid insulator, such as oil.
liquid-flow alarm An electronic circuit that actuates
an alarm when the flow of a liquid through pipes or
other channels changes from a desired rate.
liquid-flow control A servo system that automatically
maintains or corrects the rate of liquid flow
through pipes or other channels.
liquid-flow gauge See LIQUID-FLOW METER.
liquid-flow indicator See LIQUID-FLOW METER.
liquid-flow meter An instrument that indicates
the rate at which a liquid moves through pipes or
other channels.
liquid-flow switch In a liquid-cooled system, a
switch that actuates an alarm when the liquid
slows or stops.
liquid-jet oscillograph A graphic recorder using
an ink-jet galvanometer to trace the pattern on a
paper chart.
liquid laser A laser in which the active material is
a liquid.
liquid-level alarm An electronic device that actuates
visual or audio signal devices when the surface
of a liquid inside a tank rises or falls to a
predetermined level.
liquid-level control A servo system that automatically
maintains the liquid in a tank at a predetermined
level.
liquid-level gauge An electronic system that provides
direct readings of the level of a liquid in a
tank.
liquid-level indicator See LIQUID-LEVEL GAUGE.
liquid-level meter See LIQUID-LEVEL GAUGE.
liquid load See WATER LOAD.
liquid-pressure alarm An electronic circuit that
actuates an alarm when the pressure of a liquid
changes.