Industrial Terminology Glossary – H
Handbook 44 (H-44) serves as a nationwide benchmark aimed at guaranteeing the precision of weighing scales. Read More…
An instrument designed to gauge a material’s ability to withstand permanent deformation. Read More…
Harmonics
Current or voltages which have frequencies that are integer multiples of the fundamental power frequency; common and sometimes dangerous in nonlinear loads.
A versatile tool designed to emit a consistent stream of hot air, typically ranging from 100°C to 550°C (200-1000°F). This adaptable device excel in functions such as efficiently drying damp surfaces, eliminating adhesives or paint, precisely reforming materials, and compactly shrinking them. Read More…
Heat sealing is a technique used to establish electrical conductive adhesive connections between flexible and rigid circuit boards, glass panel displays, and flexible foils. This procedure involves using a heat-sealing device, which applies heat and pressure to the adhesive previously printed on a connector or flexible foil. Read More…
Heat Transfer (Conduction)
Transfer of heat by contact within the same body or from one body to another. Body can be solid, liquid or gas. In metals, conductance occurs by the movement of valence electrons.
Heat Transfer (Convection)
Heat transfer by actual motion of the hot material (liquid or gas).
Heat Transfer (Radiation)
Heat transfer via transforming thermal energy into electromagnetic waves that travel through space (air or vacuum). The wave is retransformed into heat upon absorption by receptor.
Heat Treat
A method of thermal strain relieving T/C or RTD wires that have been cold-worked (stamped, machine-formed, etc). For Platinum RTDs elements after winding, anneal at 1800-2200°F, then air-cool. For thermocouples, anneal for 15 minutes at 900-1000°C, cool slowly at about 500°C, then air-cool. Heat treat in clean dry air or Nitrogen or Argon or (if components are required bright) in cracked ammonia or hydrogen with a very low dew point (-40°C and low impurity content). Before annealing, decrease in TCE or other suitable solvent.
A precision instrument used for measuring the vertical dimension of objects. Read More…
Hermetically Sealed
Sealed in such a way that no air may enter or leave the structure or container.
Hertz (Hz)
The SI unit of frequency, equal to one cycle per second.
A high potential tester, commonly referred to as a hipot tester, is an instrument used for assessing the insulation resistance of electrical apparatus and components. Read More…
Hot Plate
A small portable appliance that features one or two electric heating elements or gas burners.
A device designed for measuring atmospheric moisture levels. Available in different formats such as digital and analog, each variant has its unique benefits. Read More…
Hysteresis
The hysteresis is an error of a sensor or gauge, which is defined as the maximum difference in output at any measurement value within the unit’s specified range when approaching the point first with increasing and then with decreasing the input parameter.
