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54. Calibration function (7.2.3): A mathematical model reconstructing the behavior of a measuring instrument as the inverse of the transduction function [analogous to the VIM definitions [4.30 and 4.31]].
55. Correction function (7.2.3): A mathematical model of the object under measurement as considered in a direct measurement, such that the measurand is a
function of the effective property and the affecting properties. It may take into
account bias [the VIM does not define this concept].
56. Combination function (7.2.3): A mathematical model of the object under measurement as considered in an indirect measurement, such that the measurand is
a function of other properties of the object or the context [the VIM does not
define this concept].
57. Instrument accuracy (3.2.1): An overall feature of a measuring instrument
related to its ability to produce a measured value that is close to an accepted
reference value, typically the value associated with the reference property of the
measurement standard used to assess the metrological features of the instrument. It is similar to validity in the human sciences [analogous to the VIM definition [2.13]].
58. Instrument trueness (3.2.1): A feature of a measuring instrument related to its
ability to produce measured values whose average is close to an accepted reference value in a sufficiently large series of replicate-independent measurements
on the same or similar objects under specified conditions, where typically the
value is associated with the reference property of the measurement standard
used to assess the metrological features of the instrument [analogous to the
VIM definition [2.14]].
59. Instrument precision (3.2.1): A feature of a measuring instrument related to
its ability to produce indication values or measured values close to each other in
a series of replicate-independent measurements on the same or similar objects
under specified conditions. It is also known as reliability in the human sciences
[analogous to the VIM definition [2.15]].
60. Instrument sensitivity (3.2.1): A feature of a measuring instrument related to
the ability of its transducer to produce changes of the indication in response to
changes of the property under measurement. Sensitivity is computed as the
ratio of the change of indication values and the corresponding change of values
of the property under measurement, while the influence properties are maintained constant [analogous to the VIM definition [4.12]].
61. Instrument selectivity (3.2.1): A feature of a measuring instrument related to
the ability of its transducer to not produce changes of the indication in response
to changes of an influence property. Selectivity with respect to an influence
property is computed as the inverse of the ratio of the change of indication values and the corresponding change of values of the influence property, while the
property under measurement is maintained constant [a generalization of the
VIM definition [4.13]].
62. Instrument stability (3.2.1): A feature of a measuring instrument related to the
ability of its transducer to not produce changes of the indication while time
passes. Stability is computed as the inverse of the ratio of the change of indicaAppendix A: A basic concept system of measurement
54. Calibration function (7.2.3): A mathematical model reconstructing the behavior of a measuring instrument as the inverse of the transduction function [analogous to the VIM definitions [4.30 and 4.31]].
55. Correction function (7.2.3): A mathematical model of the object under measurement as considered in a direct measurement, such that the measurand is a
function of the effective property and the affecting properties. It may take into
account bias [the VIM does not define this concept].
56. Combination function (7.2.3): A mathematical model of the object under measurement as considered in an indirect measurement, such that the measurand is
a function of other properties of the object or the context [the VIM does not
define this concept].
57. Instrument accuracy (3.2.1): An overall feature of a measuring instrument
related to its ability to produce a measured value that is close to an accepted
reference value, typically the value associated with the reference property of the
measurement standard used to assess the metrological features of the instrument. It is similar to validity in the human sciences [analogous to the VIM definition [2.13]].
58. Instrument trueness (3.2.1): A feature of a measuring instrument related to its
ability to produce measured values whose average is close to an accepted reference value in a sufficiently large series of replicate-independent measurements
on the same or similar objects under specified conditions, where typically the
value is associated with the reference property of the measurement standard
used to assess the metrological features of the instrument [analogous to the
VIM definition [2.14]].
59. Instrument precision (3.2.1): A feature of a measuring instrument related to
its ability to produce indication values or measured values close to each other in
a series of replicate-independent measurements on the same or similar objects
under specified conditions. It is also known as reliability in the human sciences
[analogous to the VIM definition [2.15]].
60. Instrument sensitivity (3.2.1): A feature of a measuring instrument related to
the ability of its transducer to produce changes of the indication in response to
changes of the property under measurement. Sensitivity is computed as the
ratio of the change of indication values and the corresponding change of values
of the property under measurement, while the influence properties are maintained constant [analogous to the VIM definition [4.12]].
61. Instrument selectivity (3.2.1): A feature of a measuring instrument related to
the ability of its transducer to not produce changes of the indication in response
to changes of an influence property. Selectivity with respect to an influence
property is computed as the inverse of the ratio of the change of indication values and the corresponding change of values of the influence property, while the
property under measurement is maintained constant [a generalization of the
VIM definition [4.13]].
62. Instrument stability (3.2.1): A feature of a measuring instrument related to the
ability of its transducer to not produce changes of the indication while time
passes. Stability is computed as the inverse of the ratio of the change of indicaAppendix A: A basic concept system of measurement