# The Meters (Certification) Regulations 1990, Paragraph 3: Accuracy tests


(1) Apparatus used for determining the errors of meters during these tests shall comply with the directions.
(2) The rate of advance of meters over a test period shall be obtained by reading the electro-mechanical register or electronic display on or connected to meters and by monitoring the rotation of the disc or pulse output of meters.
(3) For any test load applied to the meters under test, the load applied to a working standard integrating meter shall not be less than 25% or more than 125% of its full load rating.
(4) For a working standard wattmeter, the applied load shall not be less than 40% of its full scale or range reading.

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Source: https://www.legislation.gov.uk/uksi/1990/792/schedule/3/paragraph/3n2 (the official version)
Page: https://openlegislation.uk/meters-certification-regulations-1990/schedule-3/paragraph-3n2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.