18WuD2x

414 lm/m 2 • loading disk
lm/m 2 Abbreviation of lumens per square meter.
Also see LUMEN and LUX.
lm/W Abbreviation of lumens per watt, a unit of luminosity.
Also see LUMEN.
ln Representation of the natural (base-e) logarithm
function (see NAPIERIAN LOGARITHM). Also
written loge.
L network An impedance-matching circuit, filter,
or attenuator whose schematic representation resembles
an inverted letter L.
LO Abbreviation of LOCAL OSCILLATOR.
lo Abbreviation of low, usually as a prefix or subscript.
Also abbreviated L.
load 1. Also called electrical load. A device or circuit
that is operated by the electrical power output of
another device or circuit. Examples: speaker, light
bulb, power amplifier, antenna system. 2. Also
called mechanical load. The mechanical power
output demanded of a machine—especially a motor.
3. To fill an internal computer storage with information
from an external storage [e.g., from a
magnetic disk to a computer’s random access
memory (RAM)]. 4. To add inductors and/or capacitors
to an antenna system to alter the characteristics
of the system—especially the resonant
frequency. 5. To adjust the output circuit of a
radio-frequency power amplifier for optimum
energy transfer to the antenna system.
load-and-go Automatic coding in which a user’s
(source) program is translated automatically into
machine language and stored.
load capacitance 1. The capacitance present in an
electrical load (see LOAD, 1). 2. A capacitance
used as an electrical load.
load capacity 1. In pulse-code modulation, the
level at which a sine-wave signal has peaks coinciding
with the plus/minus virtual decision values
of the encoder. 2. The maximum number of
signals that a medium or line can carry without
serious degradation of reception.
load circuit 1. The circuit that forms the load, or
power-consuming portion, of a system. 2. A circuit
that facilitates transfer of power to a load.
load coil See WORK COIL.
load current The current flowing in a load. See
LOAD.
load division A method of connecting two or more
power sources to a single load, for optimum
power transfer.
loaded antenna An antenna incorporating a
LOADING COIL and/or LOADING DISK to increase
its electrical (effective) length. See LOAD-
ING COIL and LOADING DISK.
loaded line A transmission line in which inductors
or capacitors are inserted at appropriate points to
alter the characteristics of the line.
load end The end of a transmission line to which a
radiator or receiver is connected.
load flicker Fluctuations in the brightness of
lamps, caused by intermittent loading of the
power line by other devices.
Coaxial
feed
line
loaded antenna
Shortened radiator
Loading coil
Radial
system
load/haul/dump Abbreviation, LHD. A remotecontrolled
or computer-controlled robot used in
mining and construction work. Under the direction
of a human operator or a computer, it loads,
hauls, and dumps materials (hence its name). It
can use various navigation methods, including
beacons, computer maps, position sensors, and
vision systems.
load impedance Symbol, Z L . The impedance presented
by a load connected to a generator or other
source.
loading 1. The matching of source impedance to
load impedance, usually by means of the introduction
of an inductance or capacitance into the
load itself. 2. Any form of impedance matching.
3. The addition of inductance and/or capacitance
to an antenna system to alter the characteristics
of the system—especially the resonant frequency.
4. The modification of the acoustic impedance of
a loudspeaker.
loading coil An inductor inserted in a circuit to increase
its total inductance or to provide some
special effect, such as canceling capacitive reactance.
See LOADED ANTENNA and PUPIN COIL.
loading disk Also called capacitance hat. A metal
disk mounted atop a vertical antenna to increase
its effective length and thereby lower its resonant
frequency. It also increases the bandwidth of the
system.