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Terms for subject Metrology (318 entries)

DPD method	Method of determinating the concentration of oxidation agents by colour comparison using diethyl-para-phenyl-diamine reagent
drift	An undesired gradual change in the input-output relationship of a device over a period of time, not caused by external influences on the device
duty cycle	For a device that operates intermittently, the ration of working time to total time, usually expressed as percent. Also known as "duty factor"
dye penetration test	A non-destructive material test that gives information about the presence of fissures, overlaps, folds, pores and bonding faults in the surface of a material
ECR heating	electron-cyclotron resonance heating
electromagnetic compatibility	The electromagnetic compatibility of the measuring equipment expressed as either the results of the individual tests e.g. IEC 61000-4 series or conformance to a particular standard, e.g. IEC 61326-1, which incorporates these tests
electromagnetic flowmeter	Flowmeter which creates a magnetic field perpendicular to the flow so enabling the flow rate to be deduced from the induced electromotive force (e.m.f.) produced by the motion of conducting fluid in the magnetic field. The electromagnetic flowmeter consists of a primary device and one or more secondary devices
ECR heating	electron-cyclotron resonance heating
enclosure	All the walls which surround the live parts of electrical apparatus including doors, covers, cable entries, rods, spindles and shafts
environment	Specification of the environmental conditions under which the measuring equipment can be stored and operated within its specified accuracy limits and without permanent impairment of its operating characteristics
environmental condition	A specification of surrounding parameter values necessary for the protection or proper operation of a function unit. The condition is usually specified as a nominal value and a tolerance range
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