Document ID: chunk:federal_register_of_legislation:F2024L00447:front:0:p6
Version: federal_register_of_legislation:F2024L00447
Segment Type: other
Provision Reference: 
Character Range: 17352–20487

of this regulation, the following definitions shall apply:

              3.1. "Vehicle type with regard to Real Driving Emissions" means a group of vehicles which do not differ with respect to the criteria constituting a "PEMS test family" as defined in paragraph 6.3.1.

              3.2. Test equipment

              3.2.1. "Accuracy" means the difference between a measured value and a reference value, traceable to a national or international standard and describes the correctness of a result, as depicted in Figure 1.

              3.2.2. "Adapter" means in the context of this regulation mechanical parts that allow the connection of the vehicle to a commonly used or standardised measurement device connector.

              3.2.3. "Analyser" means any measurement device that is not part of the vehicle but installed to determine the concentration or the amount of gaseous or particle pollutants.

              3.2.4. "Calibration" means the process of setting a measurement system's response so that its output agrees with a range of reference signals.

              3.2.5. "Calibration gas" means a gas mixture used to calibrate gas analysers.

              3.2.6. "Delay time" means the difference in time between the change of the component to be measured at the reference point and a system response of 10 per cent of the final reading (t10) with the sampling probe being defined as the reference point, as depicted in Figure 2.

              3.2.7. "Full scale" means the full range of an analyser, flow-measuring instrument or sensor as specified by the equipment manufacturer or the highest range used for the specific test.

              3.2.8. "Hydrocarbon response factor" of a particular hydrocarbon species means the ratio between the reading of a FID and the concentration of the hydrocarbon species under consideration in the reference gas cylinder, expressed as ppmC1.

              3.2.9. "Major maintenance" means the adjustment, repair or replacement of a component or module that could affect the accuracy of a measurement.

              3.2.10. "Noise" means two times the root mean square of ten standard deviations, each calculated from the zero responses measured at a constant frequency which is a multiple of 1.0 Hz during a period of 30 seconds.

              3.2.11. "Non-methane hydrocarbons" (NMHC) means the Total Hydrocarbons (THC) minus the methane (CH4) contribution.

              3.2.12. "Precision" means the degree to which repeated measurements under unchanged conditions show the same results (Figure 1).

              3.2.13. "Reading" means the numerical value displayed by an analyser, flow-measuring instrument, sensor or any other measurement devise applied in the context of vehicle emission measurements.

              3.2.14. "Reference value" means a value traceable to a national or international standard, as depicted in Figure 1.

              3.2.15. "Response time" (t90) means the difference in time between the change of the component to be measured at the reference point and a system response of 90 per cent of the final reading (t90) with the sampling