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Diesel engine particulate certification, heretofore limited to on-highway truck engines, will be expanded in scope beginning in 1996 to eventually include all diesel engines. Legislation in Europe, Japan and California will extend certification efforts to engines powering generator sets, construction/agricultural vehicles, locomotive and marine engines, using “steady-state” test guidelines proposed in ISO 8178, Parts 1 - 7. “Mini-dilution” tunnels have been the European and Japanese systems of choice for dilute particulate emissions certification for non-U.S. truck diesel engines. However, repeatability, steady-state test correlation vs. full dilution systems, portability, sampling time, size and system cost have precluded universal industry and regulatory acceptance of existing “mini-system” designs. To address corporate particulate measurement needs, Caterpillar Inc. developed a device known internally as a “Micro-Dilution Particulate Measurement System”.