# 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 3.3.2: Calculation of PM using the double dilution method


Vep=Vset− Vssdwhere:
Vepis the volume of diluted exhaust gas flowing through the particulate sample filter under standard conditions;
Vsetis the volume of the double diluted exhaust gas passing through the particulate sampling filters under standard conditions;
Vssdis the volume of the secondary dilution air under standard conditions.
Where the secondary diluted sample gas for PM measurement is not returned to the tunnel, the CVS volume shall be calculated as in single dilution, i.e.:
Vmix=Vmix indicated+ Vepwhere:
Vmix indicatedis the measured volume of diluted exhaust gas in the dilution system following extraction of the particulate sample under standard conditions.

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Source: https://www.legislation.gov.uk/eur/2017/1151/annex/Sub/7/division/division/3./division/3.3./division/3.3.2. (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-1151/annex-Sub/7/division/division-3./division-3.3./division-3.3.2.
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.