Harmonization Documents HD-21 and HD-22 are standards for PVC and rubber jacketed cables respectively. Each of the European countries signing these standards has agreed to recognize the cordage testing and evaluation that is performed by any other licensing body producing to these standards.
HPD
Heater cord with thermoset insulation and cotton or rayon braid overall.
HPN
Parallel heater cord.
Hall Effect
(circuit) The Hall effect occurs when a magnetic field is applied to a current carrying semiconductor chip; it creates a voltage perpendicular to both the direction of current and the magnetic field. This means that moving the magnetic field in relation to the chip can control the output of the chip. The effect is used to make switches and sensors.
correctly identified itself, and all systems are ready to initiate communication.
Hardware
(connector) The shells, guide pins, locking springs, jackscrews, strain relief clamps, shields, mounting screws, and other devices which may be added to a connector to make it acceptable for a particular function.
Harness
An arrangement of wires and cables, usually with many breakouts, which have been tied together or pulled into a rubber or plastic sheath, used to interconnect an electric circuit. (component) A wire assembly involving two or more wires that are prepared and ready for installation into a unit or system.
Heat Guns
(component) Heat producing devices used for softening, curing, drying, preheating, and welding of plastics, coatings, and compounds as well as shrinking of heat-shrinkable plastic tubing and plastic films.
Heat Resistant
(terminal) A copper or brass terminal nickel plated to withstand 650_F.
Heat-Shrinkable
(material) A type of plastic material that has been cross-linked. A term describing tubes, sleeves, caps, boots, films, or other forms of plastic which shrink to encapsulate, protect, or insulate connections, splices, terminations, and other configurations.
Heat Sink
(component) A contrivance, usually a mass of metal, that is added to a device for the purpose of absorbing or dissipating heat away from a critical area or part. Used with power transistors, and many types of metallic rectifiers. Also called dissipator.
Heat Sink Tab
(component feature) A mechanical tab on an integrated circuit package for attachment to a heat sink.
Henry
Unit of inductance such that the induced voltage in volts is numerically equal to the rate of change in current amperes per second.
Hermaphroditic Connector
(component) A connector in which both mating members are exactly alike at their mating face.
Hermaphroditic Contact
(product feature) A contact design which mates with another contact of the same design.
Hermetic
(product feature) Airtight, impervious to external influence, as in a hermetic package. Often used to describe metal-to-metal solder or weld sealed packages. In reality all materials are permeable, hence specifications define acceptable levels of hermeticity.
Hermetic Seal
(connector) Hermetically sealed connectors are usually multiple contact connectors where the contacts are bonded to the connector by glass or other materials and permit a maximum leakage rate of gas through the connector of 1.0 micron ft/hr at one atmosphere pressure for special applications. Maximum leakage rates below 1.0 can be specified.
Hertz (Hz)
A term replacing cycles-per-second as an indication of frequency. International standard term for cycles per second. Named after the German physicist Heinrich R. Hertz (e.g., 60 cycles per second is equal to 60 hertz or 60 Hz).
High-Density Polyethylene
(material) A group of polyethylenes whose density ranges between 0.93 – 0.97 g/cm3. They have less branching than low-density polyethylene, giving it a more rigid structure.
High-Speed Socket
(connector) A ceramic chip carrier socket for high pin count circuits of up to 164 contacts on .020in. centerlines. High speed refers to the short electrical length of the contacts.
High Voltage
(electrical) Generally considered to be a wire or cable with an operating voltage of over 600 volts. Also called high tension.
Hi-Temp
(terminal) A terminal designed to withstand extremely high temperatures; usually made from nickel and/or nickel alloys.
Hi-Pot
A test designed to determine the highest voltage that can be applied to a conductor without breaking through the insulation.
Hold Current
(circuit) The minimum current which will keep the contact springs in a relay energized. Also called the electrical hold value.
Holding Strength
(connector) Ability of a connector to remain assembled to a cable when under tension.
Hook Tongue
(terminal) A terminal with a tongue that is open from the side rather than from the end.
Hot Melts
(material) Adhesives or other thermoplastic materials used for production bonding. A mechanical bond is formed when the material cools.
Housing
(connector) An insulating encapsulation for contacts. When pins or sockets are inserted into a housing, the assembly is usually referred to as a connector. Housing is sometimes referred to as “block.”
Hybrid
(product/process) A blend or composite of two different technologies. The context defines the technologies.
Hygroscopic
(property) Capable of absorbing moisture from the air.
Hz
(abbreviation) See hertz. (symbol) Symbol used to designate current.
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