# 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 a meter over a test period shall be obtained by reading the electro-mechanical register or electronic display on or connected to meters or by monitoring the rotation of a disc or pulse output of a meter.
(3) For any test load, the load applied to a rotating integrating working standard 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% or more than 100% of its full scale or range reading.

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Source: https://www.legislation.gov.uk/uksi/1990/792/schedule/1/paragraph/3 (the official version)
Page: https://openlegislation.uk/meters-certification-regulations-1990/schedule-1/paragraph-3
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.