# Commission Regulation (EU) 2017/1151 of 1 June 2017 supplementing Regulation (EC) No 715/2007 of the European Parliament and of the Council on type-approval of motor vehicles with respect to emissions from light passenger and commercial vehicles (Euro 5 and Euro 6) and on access to vehicle repair and maintenance information, amending Directive 2007/46/EC of the European Parliament and of the Council, Commission Regulation (EC) No 692/2008 and Commission Regulation (EU) No 1230/2012 and repealing Commission Regulation (EC) No 692/2008 (Text with EEA relevance), Division 3.2.8: Air pressure


At nine equally distributed points over the nozzle outlet area, the standard deviation of the total pressure at the nozzle outlet shall be equal to or less than 0.02.
σ ΔPtq≤0,02where:
σis the standard deviation of the pressure ratio ΔPtq;
ΔPtis the variation of total pressure between the measurement points, N/m2;
qis the dynamic pressure, N/ m2.
The absolute difference of the pressure coefficient cp over a distance 3 metres ahead and 3 metres behind the centre of the balance in the empty test section and at a height of the centre of the nozzle outlet shall not deviate more than ± 0,02.
cpx=+ 3m− cpx=− 3m≤0,02where:
cpis the pressure coefficient.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/4/division/division/3./division/3.2./division/3.2.8. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/4/division/division-3./division-3.2./division-3.2.8.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.