Dictionary · Instruments
Selectivity of a measuring system
The property whereby the system provides measured values for one or more measurands that are independent of other measurands or influence quantities.
Related terms
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Datum measurement error
The measurement error of an instrument or system at a specified measured value — the error quoted at a named point rather than over the whole interval.
VIM (JCGM 200:2012) 4.27
Sensor
The element of a measuring system directly affected by the phenomenon, body, or substance carrying the quantity being measured — the Pt resistance element in an SPRT, the seismic mass in an accelerometer.
VIM (JCGM 200:2012) 3.8
Stability of a measuring instrument
The property of an instrument whereby its metrological properties remain constant in time — quantified by the time taken to drift a stated amount, or the change over a stated time.
VIM (JCGM 200:2012) 4.19
Nominal quantity value
A rounded or approximate value of a characterizing quantity of a measuring instrument that guides its appropriate use — the "100 Ω" stamped on a resistor, the "1 kg" of a weight.
VIM (JCGM 200:2012) 4.6
Zero error
The datum measurement error when the specified measured value is zero.
VIM (JCGM 200:2012) 4.28
Detector
A device or substance that indicates the presence of a phenomenon, body, or substance when a threshold of an associated quantity is exceeded — presence, not magnitude.
VIM (JCGM 200:2012) 3.9