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Terms for subject Metrology (318 entries)

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
ignition temperature	Lowest temperature of a fuel at which combustion becomes self-sustaining
immunity to temperature change	The ability of the measuring equipment to withstand given changes in ambient temperature
INCONEL	Registered trademark of Inco Alloys International, Inc., Huntington, USA
increased safety e	A type of protection in which additional measures are applied so as to give increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks inside and on external parts of electrical apparatus which does not produce arcs or sparks in normal service
independent conformity	The closeness with which the calibration curve of a device can be adjusted to approximate to the specified characteristic curve so that the maximum deviation is minimised
independent non-conformity	The maximum deviation of the actual characteristic (average of upscale and downscale readings) from a specified curve, so positioned as to minimise the maximum deviation
index mark	Any of the major or minor index marks on an instrument scale
indirect measuring method	A method of measurement in which the value of a measured variable is obtained by measurement of other quantities functionally related to the measured variable. Example: Measurement of a pressure by a column of liquid
indirect method of measurement	A method of measurement in which the value of a measured variable is obtained by measurement of other quantities functionally related to the measured variable. Example: Measurement of a pressure by a column of liquid
influence quantity	A quantity which is not the subject of measurement, but which influences the value of the measured variable of the indication of the measuring instrument, e.g. ambient temperature
IR pyrometer	infrared pyrometer