18WuD2x

ID • IEC 353
Object
Deflecting coils
Collector plate
Optical image
Electron gun
iconoscope
Photocathode
Output
ID Abbreviation of INSIDE DIAMETER.
IDA Abbreviation of integrodifferential analyzer.
I dc Symbol for the dc component of a COMPOSITE
CURRENT.
ideal Pertaining to a circuit, device, material, or
manner of operation that is assumed to conform
to the theoretical best-case example; it is not
usually realized in real life. Thus, an ideal reactance
has no inherent resistance.
ideal capacitor A capacitor having zero dielectric
loss and a constant value of capacitance at all
alternating-current frequencies.
ideal component A theoretical component that is
assumed to be 100-percent efficient and to have
no extraneous properties. Compare PRACTICAL
COMPONENT.
ideal crystal A piezoelectric crystal that acts as a
theoretically perfect tuned circuit, that is, an
ideal capacitor and inductor.
ideal inductor An inductor having zero loss and a
constant value of inductance at all alternatingcurrent
frequencies.
I demodulator In a color-television receiver circuit,
a demodulator that receives the chrominance
and 3.58-MHz oscillator signals and
delivers a video output corresponding to color in
the picture.
identical vectors Equal vectors that have the
same initial point or point of application.
identification 1. In radar operations, the (often
automatic) determination of the target’s identity.
See, for example, IDENTIFICATION, FRIEND OR
FOE. 2. In digital computer operations, a symbol
or set of symbols within a label identifying a unit
of data or its location.
identification beacon 1. A beacon used for the determination
of a particular geographic location.
2. An automatically transmitted station-identification
signal or code, usually superimposed on
the regular transmission in the form of a subcarrier
or subaudible signal.
identification division The division (one of four)
in a COBOL program that describes and identifies
the program being compiled.
identification, friend or foe Abbreviation, IFF. A
technique in which a radar station transmits an
interrogating signal and the station questioned
replies automatically with a suitable pulse or
other signal if it is aboard a friendly aircraft or
vessel. If it is aboard an enemy vehicle, the station
gives no reply or sends an unsatisfactory
one.
identifier A data file identification label in an input/output
device, or a label that identifies a specific
storage location.
identity element A logic element that, upon receipt
of two input signals, provides an output
that is logic 1 (high) only if the input signals are
both logic 1 (high) or logic 0 (low).
idiochromatic Possessing the photoelectric properties
of a true crystal.
I display See I SCAN.
idle channel noise A measurement of wideband
noise. The total energy at an output of an integrated
circuit or other communications stage
with that output grounded (idle).
idle character A digital character that conveys no
information, but helps maintain synchronization
between the transmitter and receiver. Sometimes
called a blank.
idler wheel In a phonograph or magnetic tape
recorder, an auxiliary, rubber-coated wheel that
transfers rotary motion from the motor pulley to
the platter or the rim of the capstan flywheel.
idle time The period during which data processing
equipment, although operable, is not in use.
idling Standby equipment operation, as when vacuum-tube
filaments in a radio-frequency power
amplifier are kept hot—even when the amplifier is
not actually being used to transmit a signal.
idling current The current flowing in a device during
a standby period, as opposed to operating
current. Also called STANDBY CURRENT.
idling frequency In a parametric amplifier, the difference
between the signal frequency and pump
frequency.
idling power See STANDBY POWER.
idling voltage The voltage required by or measured
in a device that is in standby mode.
I D(off) Symbol for drain cutoff current in a field-effect
transistor.
IDOT Abbreviation of instrumentation online transcriber.
IDP 1. Abbreviation of INDUSTRIAL DATA PRO-
CESSING. 2. Abbreviation of INTEGRATED DATA
PROCESSING. 3. Abbreviation of INTERMODU-
LATION-DISTORTION PERCENTAGE.
I DSS Symbol for DRAIN CURRENT AT ZERO GATE
VOLTAGE in a field-effect transistor.
I E Symbol for EMITTER CURRENT.
IEC Abbreviation of integrated electronic component.