18WuD2x

X 1. Symbol for REACTANCE. 2. Symbol for no connection.
(Also, NC.) 3. Symbol for the HORIZON-
TAL AXIS of a graph or screen in the rectangular
(Cartesian) coordinate system. 4. Symbol for an
unknown quantity.
x 1. Symbol for number of carriers drawn from collector
to base of a transistor, for each carrier collected.
2. Symbol for an unknown quantity. 3.
Symbol for the HORIZONTAL AXIS of a graph or
screen in the rectangular (Cartesian) coordinate
system.
x amplifier The horizontal amplifier of an oscilloscope
or recorder. Compare Y AMPLIFIER and Z
AMPLIFIER.
X and Z demodulation Color television demodulation
based on the 60-degree difference between
the two reinserted 3.58-MHz subcarrier signals.
The R-Y, B-Y, and G-Y voltages derived from the
demodulated signals control the three guns of the
picture tube. Compare Q MODULATION.
x-axis
1. The horizontal axis of a chart, graph, or
screen in the rectangular (Cartesian) coordinate
system. 2. In a quartz crystal, the axis drawn
through the corners of the hexagon.
x-axis amplifier See X AMPLIFIER.
XB Abbreviation of crossbar.
X balance The reactance balance (either the variable
component or the adjustment of it) in an
impedance bridge in which separate resistance
(R) and reactance (X) balancing is provided.
X band The frequency band extending from 5.2 to
11 GHz.
X bar A rectangular, piezoelectric quartz bar cut
from a Z-section, whose faces are parallel to the
X-axis and whose edges are parallel to the X-, Y-,
and Z-axes. See CRYSTAL CUTS.
X bridge An alternating-current bridge for measuring
reactance.
X C Symbol for CAPACITIVE REACTANCE.
X channel The horizontal channel of an oscilloscope
or recorder. Compare Y CHANNEL and Z
CHANNEL.
X-channel gain See X GAIN.
X component In a complex impedance, the reactive
component (either inductive or capacitive).
x coordinate See ABSCISSA.
X-cut crystal A piezoelectric plate cut with its
faces perpendicular to the X-axis of a quartz crystal.
See CRYSTAL CUTS.
xcvr Abbreviation of TRANSCEIVER. Often capitalized.
X deflection Horizontal deflection of the spot on
the screen of a cathode-ray tube. Compare Y DE-
FLECTION.
X diode The decoding diode in each of the X lines
of a memory matrix. Compare Y DIODE.
X direction The horizontal direction in deflections
and in graphical presentations of data.
X drive The driving source or energy for the X lines
of a computer memory matrix.
xducer Abbreviation of TRANSDUCER.
Xe Symbol for XENON.
xenon Symbol, Xe. An inert gaseous element.
Atomic number, 54. Atomic weight, 131.29.
Xenon is present in trace amounts in the earth’s
atmosphere and is used in some thyratrons, electric
lamps, and lasers.
xenon tube A flash tube filled with xenon.
xerography A system for the reproduction of
printed matter, drawings, and other graphic matter.
It is an electrostatic process in which a
charged photoconductive surface is exposed to an
Copyright 2001 The McGraw-Hill Companies, Inc. Click Here for Terms of Use