"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" Definition and Terms.
HORSEPOWER. The English unit of power equal to work done at the rate of 550 foot-pounds per
second; equal to 746 watts of electrical power.
HORSESHOE MAGNET. A permanent magnet or electromagnet bent into the shape of a horseshoe or
having a U-shape to bring the two poles near each other.
HOT CARRIER. A carrier, which may be either a hole or an electron, that has relatively high energy with
respect to the carriers normally found in majority-carrier devices.
HOT-CARRIER DIODE. A semiconductor diode in which hot carriers are emitted from a semiconductor
layer into the metal base. Also called HOT-ELECTRON DIODE. An example is the Schottky barrier
diode.
HOT-WIRE METER MOVEMENT. A meter movement that uses the expansion of a heated wire to
move the pointer of a meter; measures dc or ac.
HPIB. Hewlett-Packard Interface Bus. Another name for the GPIB interface, see also IEEE-488
HSSI. High Speed Serial Interface. The HSSI interface uses differential ECL lines to transmit data at 52Mbps out to a maximum distance of 50 feet, also EIA613.
H-TYPE T-JUNCTION. A waveguide junction in which the junction arm is parallel to the magnetic lines
of force in the main waveguide.
HYBRID CIRCUIT. A circuit where passive components (resistors, capacitors) are deposited onto a
substrate made of glass, ceramic, or other insulating material. Then the active components (diodes,
transistors) are attached to the substrate and connected to the passive components on the substrate with
a very fine wire.
HYBRID ICs. Two or more integrated circuit types, or one or more integrated circuit types and discrete
components on a single substrate.
HYBRID JUNCTION. A waveguide junction that combines two or more basic T-junctions.
HYBRID MIXER. See BALANCED MIXER. RF Mixer Manufacturers
HYBRID RING. A hybrid-waveguide junction that combines a series of E-type T-junctions in a ring
configuration. When properly terminated, energy is transferred from any one branch into any two of the
remaining three branches.
HYDROMETER. An instrument used to measure specific gravity. In batteries hydrometers are used to
indicate the state of charge by the specific gravity of the electrolyte.
HyperTransport. A Point-to-Point interface with at least two unidirectional links. The HyperTransport has a data rate of 800M Bytes/ps using 8 bit pairs and a 400MHz clock.
HYSTERESIS. The time lag of the magnetic flux in a magnetic material behind the magnetizing force
producing it. Caused by the molecular friction of the molecules trying to align themselves with the
magnetic force applied to the material.
HYSTERESIS LOSS. The power loss in an iron-core transformer or other alternating-current device as a
result of magnetic hysteresis.
HZ. Hertz.
"I" Terms and Definitions
