scope:

Scope and object

This International Standard applies to the specification of performance, with primary reference to industrial applications, of the following kinds of electrical and electronic equipment:

 - indicating and recording instruments which measure electrical quantities;

 - material measures which supply electrical quantities;

 - instruments which measure non-electrical quantities using electrical means, for all parts of the measuring chain which present electrical output signals.

This standard applies to the specification of performance of instruments operating in steady-state conditions (see 3.1.15), usual in industrial applications.

It is based on the methods expounded in GUM for expressing and evaluating the uncertainty of measurement, and refers to GUM for the statistical procedures to be used in determining the intervals assigned to represent uncertainty (including the way to account for nonnegligible uncertainties in the traceability chain).

This standard does not address the propagation of uncertainty beyond the instrument (or the measuring equipment) whose performance is considered and which may undergo compliance testing.

The object is to provide methods for ensuring uniformity in the specification and determination of uncertainties of equipment within its scope. All other necessary requirements have been reserved for dependent IEC product standards pertaining to particular types of equipment which fall within the scope of this standard.

For example: the selection of metrological characteristics and their ranges, and of influence quantities and their specified operating ranges, is reserved for IEC product standards.