# IEC 60359:2001 pdf download

IEC 60359:2001 pdf download.Electrical and electronic measurementequipment – Expression of performance.

3 Definitions

For the purposes of this International Standard, the following definitions apply.

A word between brackets in the title of a definition is a qualifier that may be skipped if there is no danger of confusion with a similar term. When two terms may be used interchangeably with the same definition, these are separated by “or”. Terms in italics in a note are new terms defined by the context.

Most definitions are taken or adapted, together with their notes, from Part 311 of IEC 60050-300 (International Electrotechnical Vocabulary — 1EV). As only terms pertaining to the “uncertainty approach” are used, 1EV notes stating that the term is used in this approach were omitted. Where such definitions are simultaneously drawn from the International Vocabulary of Basic and General Terms in Metrology (VIM), this has been indicated. In some cases, notes have been added for the purposes of this standard.

3.1 Basic definitions

3.1.1

measurand

quantity subjected to measurement, evaluated in the state assumed by the measured system during the measurement itself

NOTE 1 The value assumed by a quantity subjected to measurement when it is not interacting with the measuring instrument may be called unperturbed value of the quantity.

NOTE 2 The unperturbed value and its associated uncertainty can only be computed through a model of the measured system and of the measurement interaction with the knowledge of the appropriate metrological characteristics of the instrument, that may be called instrumental load.

3.1.2

(result of a) measurement

set of values attributed to a measurand, including a value, the corresponding uncertainty and the unit of measurement

[1EV 311-01-01, modified]

NOTE 1 The mid-value of the interval is called the value (see 3.1.3) of the measurand and its half-width the uncertainty (see 3.1.4) [1EV modified].

NOTE 2 The measurement is related to the indication (see 3.1.5) given by the instrument and to the values of correction obtained by calibration [1EV modified].

NOTE 3 The interval can be considered as representing the measurand provided that it is compatible with all other measurements of the same measurand [1EV modified].

NOTE 4 The width of the interval, and hence the uncertainty, can only be given with a stated level of confidence (see 3.1.4, NOTE 1) [1EV modified].

3.1.3

(measure-) value

mid element of the set assigned to represent the measurand

NOTE The measure-value is no more representative of the measurand than any other element of the set. It is singled out merely for the convenience of expressing the set in the format V ± U, where V is the mid element and U the half-width of the set, rather than by its extremes. The qualifier “measure-” is used when deemed necessary to avoid confusion with the reading-value or the indicated value.

3.1.4

uncertainty (of measurement)

parameter, associated with the result of a measurement, that characterizes the dispersion of the values that could reasonably be attributed to the measurand

[1EV 311-01-02, VIM 3.9]

NOTE 1 The parameter can be, for example, a standard deviation (or a given multiple of it), or a half-width of an interval having a stated level of confidence [1EV, VIM].

NOTE 2 Uncertainty of measurement comprises, in general, many components. Some of these components can be evaluated from the statistical distribution of the results of a series of measurements and can be characterized by experimental standard deviations. The other components, which can also be characterized by standard deviations, are evaluated from the assumed probability distributions based on experience or other information [1EV, VIM].

NOTE 3 It is understood that the result of the measurement is the best estimate of the value of the measurand, and that all components of uncertainty, including those arising from systematic effects, such as components associated with corrections and reference standards, contribute to the dispersion [1EV, VIM].