# Regulation (EU) No 540/2014 of the European Parliament and of the Council of 16 April 2014 on the sound level of motor vehicles and of replacement silencing systems, and amending Directive 2007/46/EC and repealing Directive 70/157/EEC (Text with EEA relevance), Division 4.2.5.3.2.2: Test procedure

Extent: E+W+S+N.I.

The engine speed shall be gradually increased from idle to the target engine speed, not exceeding a tolerance band of ± 3 % of the target engine speed, and held constant. Then the throttle control shall be rapidly released and the engine speed shall return to idle. The sound level shall be measured during a period of operation consisting of maintaining constant engine speed of 1 second and throughout the entire deceleration period. The maximum sound level meter reading during this period of operation, mathematically rounded to the first decimal place, shall be taken as the test value.

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Source: https://www.legislation.gov.uk/eur/2014/540/annex/II/division/4/division/4.2/division/4.2.5/division/4.2.5.3/division/4.2.5.3.2/division/4.2.5.3.2.2 (the official version)
Page: https://openlegislation.uk/eu-regulation-2014-540/annex-II/division-4/division-4.2/division-4.2.5/division-4.2.5.3/division-4.2.5.3.2/division-4.2.5.3.2.2
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.