"A"
"B"
"C",
"D",
"E",
"F",
"G",
"H",
"I",
"J",
"K",
"L",
"M",
"N",
"O",
"P",
"Q",
"R",
"S",
"T",
"U",
"V",
"W",
"X",
"Y",
"Z"
Previous set of "H" terms and definitions.
H-FIELD. Any space or region in which a magnetic force is exerted. The magnetic field may be produced
by a current-carrying coil or conductor, by a permanent magnet, or by the earth itself.
HIC. Heterogeneous Interconnect bus provides a bidirectional serial interconnect which builds a scalable parallel system using pairs of unidirectional lines. IEEE-1355 defines the physical and Logic Link layers between a Chip-to-Chip, Board-to-Board, or Chassis-to-Chassis interface. The HIC interface is obsolete.
HIGH FREQUENCY. The band of frequencies from 3 megahertz to 30 megahertz.
HIGH-FREQUENCY COMPENSATION. See PEAKING COIL.
HIGH-LEVEL MODULATION. Modulation produced in the plate circuit of the last radio stage of the
system.
HIGH-PASS FILTER. A filter that passes a majority of the high frequencies on to the next circuit and
rejects, or attenuates, the lower frequencies. Also called a Low-Frequency Discriminator. Refer to the entry on Passive Filters.
HIPPI. [High-Performance Parallel Interface] The HIPPI specification defines the mechanical, electrical and signalling protocol for a high performance simplex interface [data transmits in one direction only]. An additional HPPI interface is required to transmit data in a full-duplex mode. The HIPPI interface is obsolete. HIPPI Description
HOLDING COIL. A separate coil within a relay that stays energized after the original current has been removed.
HOLD TIME. The time required to keep the data at the input to a register stable, after the device has been clocked. Also refer to Metastability.
HOLE FLOW. In the valence band, a process of conduction in which electrons move into holes, thereby
creating other holes that appear to move toward a negative potential. (The movement of holes is
opposite the movement of electrons.)
HOOKUP WIRE. Hookup wire refers to an insulated conductor free at both ends and used for chassis wiring
and interconnecting wiring. Manufacturers of Hookup wire.
HORIZONTAL AXIS. On a graph, the straight line axis that is plotted from left to right.
HORIZONTAL-DEFLECTION PLATES. A pair of parallel electrodes that moves the electron beam
from side to side in a CRT.
HORIZONTALLY POLARIZED. Waves radiated with their E field component parallel to the earth’s
surface.
HORIZONTAL PATTERN. The part of a radiation pattern that is radiated in all directions along the
horizontal plane.
HORIZONTAL PLANE. An imaginary plane that is tangent (or parallel) to the earth’s surface at a given
location.
HORN SPEAKER. A type of speaker. Refer to Manufacturers of Speakers for additional information and vendors.
Horn Speaker
Next set of "H" definitions and terms
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