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Terms for subject Metrology (318 entries)

CVGT scale	constant-volume gas thermometry scale
CW laser	continuous wave laser
D-action	derivation action
direct-current power	dc power
dead band	Finite range of values within which variation of the input variable does not produce any noticeable change in the output variable
dead band error	The maximum value of the span of the dead band
dead time	The interval between the instant when the variation of an input variable is produced and the instant when the consequent variation of the output variable starts
default value	Values which are written into the instrument memory on initial start-up, e.g. in gateways
degree of protection	The degree of protection of the enclosure expressed as an IP rating to IEC 60529 or NEMA enclosure classification
D-action	derivation action
design	The design of the measuring equipment, e.g. compact instrument, 19" plug-in card etc
destruction range	Operation in the destruction range will result in permanent impairment or destruction of the device
device	A device intended to make a measurement, alone or in conjunction with other equipment
diaphragm	Pressure: A thin flexible disc that is supported around the edges and whose centre is allowed to move in a direction perpendicular to the plane of the disc; it is used for a wide variety of purposes, such as detecting or reproducing sound waves, keeping two fluids separate while transmitting the pressure or motion between them, or producing a mechanical or electrical signal proportional to the differential pressure across the diaphragm.
diaphragm	Thin, usually porous wall used to separate liquids or gases of different compositions
digested sludge	Anaerobic sludge, stabilised through digestion
digital signal	A signal, the information parameter of which may assume any value out of a set of discrete values which are represented by numbers
dimension	The principle dimensions of the measuring equipment
direct comparison method of measurement	A method of measurement in which the value of a measured variable is compared directly with a quantity of the same kind having a known value. Example: Measurement of a length using a graduated rule
direct method of measurement	A method of measurement in which the value of a measured variable is obtained directly, rather than by measurement of other quantities functionally related to the measured variable. Note: The method of measurement remains direct even if it is necessary to make supplementary measurements to determine the values of influence quantities in order to make corresponding corrections. Example: Measurement of a length using a graduated rule