Particulate sampling. The particulate sampling can be done either with the single filter method or with the multiple filter method (Annex 4, Appendix 1, paragraph 1.5.). Since the results of the methods may differ slightly, the method used must be declared with the results. For the single filter method the modal weighting factors specified in the test cycle procedure shall be taken into account during sampling by adjusting sample flow rate and/or sampling time, accordingly. Sampling must be conducted as late as possible within each mode. The sampling time per mode must be at least 20 seconds for the single filter method and at least 60 seconds for the multi-filter method. For systems without bypass capability, the sampling time per mode must be a least 60 seconds for single and multiple filter methods.
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Sources: Agreement Concerning the Adoption of Uniform Technical Prescriptions for Wheeled Vehicles
Particulate sampling. The particulate sampling can be done either with the single filter method or with the multiple filter method (Annex annex 4, Appendix appendix 1, paragraph 1.5.). Since the results of the methods may differ slightly, the method used must be declared with the results. For the single filter method the modal weighting factors specified in the test cycle procedure shall be taken into account during sampling by adjusting sample flow rate and/or sampling time, accordingly. Sampling must be conducted as late as possible within each mode. The sampling time per mode must be at least 20 seconds for the single filter method and at least 60 seconds for the multi-filter method. For systems without bypass capability, the sampling time per mode must be a least 60 seconds for single and multiple filter methods.
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