18WuD2x

410 linear scale • line filter
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linear scale
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always has the same physical length, no matter
where on the scale it appears. For example, the
interval between 3 and 4 on a linear scale is the
same as any interval between x and x + 1, where
x is any real value on the scale.
linear sweep In a television or oscilloscope circuit,
the scanning of the electron beam across the
screen at a constant speed. Also see LINEAR, 1;
LINEAR RESPONSE, 1; and LINEARITY, 2.
linear taper In a potentiometer or rheostat, resistance
variation that is directly proportional to
shaft rotation. Thus, half the total resistance corresponds
to movement of the shaft over half the
arc of full rotation. Compare LOG TAPER. Also
see TAPER.
linear time base For an oscilloscope, the base provided
by sweeping the electron beam horizontally
at a uniform rate. Also see LINEAR SWEEP.
linear track On a video tape, the track that contains
audio information that accompanies the
video data. It was so named because it is a single,
straight track, in contrast to the video tracks,
which are angled.
linear tracking In a turntable system, a design
scheme in which the lateral movement of the stylus,
as the disc is played, occurs in a straight line,
rather than in an arc.
linear transformer A radio-frequency transformer
consisting of a section of transmission line.
linear variable differential transformer Abbreviation,
LVDT. A differential transformer exhibiting
linear response. Also see LINEAR RESPONSE, 1,
2.
Input
Linear
Coupling link
λ/4
linear transformer
3
2
1
Nonlinear
Output
line balance The degree of electrical similarity between
transmission line conductors, or between a
conductor and ground.
line-balance converter A device used to isolate
the outer conductor at the end of a coaxial line
from ground.
line characteristic distortion Fluctuations in the
duration of received signal impulses in text data
communications, caused by changing current
transitions in the wire circuit.
line circuit The telephone system relay equipment
associated with stations connected to a switchboard.
line code A code between the digits in processing
equipment and the pulses representing the digits
in a line transmission.
line conditioning In data communications, the
modification of private or leased lines by adding
compensating reactances to reduce amplitude
variations or phase delays over a band of frequencies.
line contact stylus A needle used to reproduce
stereo high-fidelity sound from vinyl discs. It has
a characteristic oblate ellipsoidal shape.
line coordinate A symbol identifying a specific row
of cells in a matrix; a specific cell can be located
with an additional column coordinate.
line cord A flexible two- or three-wire insulated cable
connecting equipment to the power line by
means of a plug that mates to a standard electrical
outlet.
line current 1. Current flowing from a power line
into equipment. 2. Current flowing in a transmission
line. 3. Current flowing into a parallelresonant
circuit.
line diffuser A circuit that creates minor vertical
oscillations of the spot on a television screen,
making the individual scanning lines less noticeable.
line driver An integrated circuit capable of transmitting
logic signals through long lines.
line drop The voltage drop along a line supplying
power to a device.
line equalizer See EQUALIZER.
line fault A discontinuity in a transmission line,
resulting in signal loss at the receiving end of a
circuit.
line feed In a text data transmission system, the
movement of the paper, platen, or cursor to allow
for printing or displaying an additional line of
text.
line filter
1. A circuit that can be inserted in the
utility power cord of an appliance, device, or system
for transient suppression and the minimization
of electromagnetic interference (EMI). The
filter employs series inductors, parallel capacitors,
and in some cases, a clamping device. Installed
between a radio transmitter and the
utility lines, such a filter can choke off radiofrequency
(RF) current and help keep utility
wiring from acting as an antenna. Installed in the