# The Meters (Certification) Regulations 1998, Paragraph 4: Methods of accuracy test

Extent: E+W+S

The tests in table 2 shall be carried out by one of the following methods—
Method A test
(1)A long period dial test where the advance of a kWh display, which is part of or connected to a meter under test, is compared with the advance of a precision kilowatt-hour meter;
Method B test
(2)A short period test where the rate of advance of a meter under test is compared to the rate of advance of a precision kilowatt-hour meter; or
Method C test
(3)A short period test where the actual rate of advance of a meter, when tested under constant power conditions over a specified test period, is compared to the calculated rate of advance for those conditions.

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Source: https://www.legislation.gov.uk/uksi/1998/1566/schedule/1/paragraph/4 (the official version)
Page: https://openlegislation.uk/meters-certification-regulations-1998/schedule-1/paragraph-4
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.