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Terms for subject Metrology (318 entries)

German Association for Instrumentation and Control	Association responsible for the production of VDI/VDE Guideline 2187 on the user interface for sensor and actuator operation
German Electrotechnical Commission	One of the bodies responsible for standardisation work in Germany, serving in DIN and VDE
graduation	Any of the major or minor index marks on an instrument scale
GYLON	Registered trademark of Garlock Sealing Technologies, Palmyra, NY, USA
HALAR®	Registered trademark of Ausimont S.p.A. Tradename for ECTFE
half-life	The time span necessary for the atoms of a nuclide to disintegrate by one half
half-thickness	The thickness of an absorbing medium that will depreciate the intensity of a radiation beam by one half
handheld instrument	Battery-operated, portable measuring instrument for use in the field and in the lab
hard rubber	Hard rubber is generally suitable for use within the temperature range 0 °C to 90 °C. It has excellent abrasion resistance against small particles and good chemical resistance, particularly to leaching agents, acid and alkalis
HAStElLOY®	Registered trademark of Haynes International, Inc., Kokomo, USA
hazardous area	An area in which an explosive gas atmosphere is or may be expected in quantities such as to require special precautions for the construction, installation and use of electrical apparatus
hazardous location	An area in which an explosive gas atmosphere is or may be expected in quantities such as to require special precautions for the construction, installation and use of electrical apparatus
Highway Addressable Remote Transmitter	Registered trademark of HART Communication Foundation, Austin, USA. Protocol for Smart transmitters
hold function	When the hold function is activated, the momentary value of the continuous input variable at the time of activation is held
human interface	The human interface specifies details of its design, operating concept, structure and functionality. The human interface describes operating elements, displays, foreign system interfaces (when allowing human operation) testing and configuration elements, e.g. solder bridges, DIP-switches, re-ranging elements, handheld terminals, auxiliary stations
HWS	The thickness of an absorbing medium that will depreciate the intensity of a radiation beam by one half
HWZ	The time span necessary for the atoms of a nuclide to disintegrate by one half
hysteresis	The property of a device or instrument whereby it gives different output values in relation to its input values depending upon the directional sequence in which the input values have been applied
hysteresis error	The maximum deviation between the two calibration curves of the measured variable as obtained by an upscale going traverse and a downscale going traverse over the full range and subtracting the value of the dead band
ion-cyclotron resonance heating	icr heating