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This standard applies to the specification of the
performance of the following kinds of electrical and
electronic equipment and instruments and the
accessories used with them:
a) Those which measure electrical quantities
(indicating and recording instruments).
b) Those which supply measured electrical
quantities (supply instruments), such as signal
generators and some power supplies.
c) Those which measure non-electrical quantities
using electrical means, excluding any parts, such
as transducers, which provide an electrical
analogue of the non-electrical quantity; and
provided that there exists no IEC product
standard relating to the equipment or its
electrical or electronic parts which has
requirements that contradict this standard. The
expression of performance covers only the
electrical or electronic part.
BS 4889:1990 : Method for specifying the Performance of electrical and electronic measuring equipment