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Terms for subject Metrology (347 entries)

accuracy	The closeness of agreement between the result of a measurement and the (conventional) true value of the quantity being measured
AF generator	audio-frequency generator
ambient 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
ambient pressure	The absolute pressure of the medium surrounding the device
ambient temperature	The temperature measured at a representative point within the local environment, including adjacent heat generating equipment, in which the measuring and control equipment will normally operate, be stored or be transported
ambient temperature effect	The change in the output signal lower range-value and/or the output span caused by a change in ambient temperature from the reference temperature to the limits of the temperature range as specified by the normal operating conditions. The effect is expressed as the percentual change in the output signal lower range-value per 10 K relative to the output span
ambient temperature range	The range of temperatures within which a device is designed to operate within specified accuracy limits
amperometric	Electrochemical measurement method in which a current signal proportional to an external variable is generated
analog signal	A signal, the information parameter of which may assume all values in a given range
analogue signal	A signal, the information parameter of which may assume all values in a given range
apparatus of category ib	An intrinsically safe electrical apparatus which is incapable of causing ignition in normal operation and with any signal fault applied
application	Specification of the applications for which the measurement equipment is designed, together with the reasons for its use
associated electrical apparatus	An electrical apparatus in which the circuits or parts of circuits are not all necessarily intrinsically safe but which contains circuits that can affect the safety of the intrinsically safe circuits associated with it
AF generator	audio-frequency generator
barrier	An electrical device that separates two circuits, e.g. an intrinsically safe circuit from a non-intrinsically safe circuit
basic setting	Settings which must be made before the instrument will measure, e.g. sensor type for Prosonic
baudrate	Units for data transmission rate, 1 Baud = 1 bit/s
Bayard-Alpert gauge	B-A gauge
binary signal	Quantises signal with only two possible values
bluff body	Nonstreamlined body used in vortex flowmeters to shed vortices. The body may be prismatic, a semi-elliptical modified parabola, a semistreamlined cylinder or modified triangle, or any combination of these forms