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Terms for subject Metrology (318 entries)

environmental influence	A change in the output of an instrument caused solely by the departure of one of the specified environmental conditions from its reference value, all other conditions being held constant
error	Of measurement: result of a measurement minus a true value of the measurand
error of linearity	The absolute value of the maximum deviation between the calibration curve and the specific straight line
European Committee for Electrotechnical Standardization	European agency for sponsoring research and development projects in electronics and related fields
Ex- 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
explosion protection	The type of protection offered by the enclosure against the ignition of a surrounding explosive atmosphere, e.g. EEX ia, Ex d
foot-pound-second unit	f.p.s. unit
factory setting	Settings which an instrument assumes after a general reset
fault	A defect or electrical break-down of any component, or connection between components, upon which the intrinsic safety of the circuit depends
Fieldbus Foundation	The Fieldbus Foundation is the leading organization dedicated to a single international, interoperable fieldbus standard
flameproof bushing	An insulating device carrying one or more conductors through internal or external walls of a flameproof enclosure without affecting the flameproof properties of the enclosure or its compartments
flameproof feedthrough	An insulating device carrying one or more conductors through internal or external walls of a flameproof enclosure without affecting the flameproof properties of the enclosure or its compartments
flash point	The minimum temperature at which a liquid emits vapour in a concentration sufficient to form an ignitable mixture with air near the surface of the liquid but not sufficient to sustain combustion
flow measuring device	A device for measuring, or giving an output signal proportional to, the rate of flow of a fluid in a pipe
flow measuring facility	A device for measuring, or giving an output signal proportional to, the rate of flow of a fluid in a pipe
flow signal	That part of the electrode signal which is proportional to the flow rate and the magnetic field strength and which is dependent on the geometry of the meter tube and the electrodes
flowmeter	A device for measuring, or giving an output signal proportional to, the rate of flow of a fluid in a pipe
foot-pound-second unit	f.p.s. unit
Foundation Fieldbus™	Foundation Field-bus™ is an open, interoperable fieldbus that is based on the ISO's Open System Interconnect (OSI) seven-layer communications model. The Foundation specification is compatible with the officially sanctioned SP50 standards project of the ISA and the IEC
full scale	The highest value of the measured variable that a device is adjusted to measure