Betekenis van:
proportional sample

proportional sample
Zelfstandig naamwoord
    • the population is divided into strata and a random sample is taken from each stratum

    Synoniemen

    Hyperoniemen


    Voorbeeldzinnen

    1. For particulates, a proportional sample shall be collected on a suitable filter.
    2. For particulates, a proportional sample shall be collected on suitable filters.
    3. A continuously proportional sample of the diluted exhaust gases and the dilution air shall be collected for analysis.
    4. During the test, the exhaust gases are diluted and a proportional sample collected in one or more bags.
    5. The sample shall also include projects implemented by the responsible authority acting as executing body at least on a proportional basis.
    6. The total system response shall be designed as to ensure a representative sample of the particulates, GSE, proportional to the exhaust mass flow.
    7. For particulates, a proportional sample shall be collected from the diluted exhaust gas on a specified filter by either partial flow dilution or full flow dilution.
    8. A set of tubes (multiple tube unit) is installed in the exhaust pipe EP to provide a proportional sample of the raw exhaust gas.
    9. For particulates, a proportional sample shall be collected from the diluted exhaust gas on a specified filter by either partial flow dilution or full-flow dilution.
    10. A bag sampling system may be used to collect a proportional sample of the air withdrawn from and admitted to the enclosure.
    11. The modal weighting factors specified in the test cycle procedure shall be taken into account by taking a sample proportional to the exhaust mass flow during each individual mode of the cycle.
    12. The isokinetic sampling probe must be installed facing upstream on the exhaust pipe centreline where the flow conditions in paragraph EP are met, and designed to provide a proportional sample of the raw exhaust gas.
    13. A set of venturis or orifices is installed in the exhaust pipe EP and in the transfer tube TT, respectively, to provide a proportional sample of the raw exhaust gas.
    14. The isokinetic sampling probe must be installed facing upstream on the exhaust pipe centreline where the flow conditions in section EP are met, and designed to provide a proportional sample of the raw exhaust gas.
    15. If flow compensation (i.e., proportional control of sample flow) is used, it must be demonstrated that the ratio of main tunnel flow to particulate sample flow does not change by more than ±2,5 per cent of its set value (except for the first 10 seconds of sampling).