Document ID: chunk:federal_register_of_legislation:F2024L00089:reg:800:p14
Version: federal_register_of_legislation:F2024L00089
Segment Type: reg
Provision Reference: reg 800 (pt 14/16)
Character Range: 67420–70198

interference of the background noise shall be avoided. If a sound peak obviously out of character with the general signal is observed, that measurement shall be discarded.

              4.2. Instrumentation and signal processing

              Analyser settings shall be agreed between the manufacturer and the Technical Service to provide data according to these requirements.

              The sound analysis system shall be capable of performing spectral analysis at a sampling rate and over a frequency range containing all frequencies of interest. The frequency resolution shall be sufficiently precise to differentiate between the frequencies of the various test conditions.

              4.3. Test methods

              4.3.1. Method (A) – Outdoor facility and vehicle in motion

              The vehicle shall be operated in the same outdoor test facility and according to the same general operating condition as for the vehicle constant speed testing (paragraph 3.3.2.).

              The vehicle sound emission shall be measured at target speeds of 5 km/h to 20 km/h in steps of 5 km/h with a tolerance of ±2 km/h for the speed of 10 km/h or less and of ±1 km/h for any other speeds. The speed of 5 km/h is the lowest target speed. If the vehicle cannot be operated at this speed within the given precision, the lowest possible speed below 10 km/h shall be used instead.

              4.3.2. Method (B) and Method (D) – Outdoor/Indoor facility and vehicle in standstill

              The vehicle shall be operated in a test facility where the vehicle can accept an external vehicle speed signal to the AVAS simulating vehicle operation. The microphone locations shall be as for the complete vehicle test conditions as specified in Figure 2a of the Appendix to this annex. The front plane of the vehicle shall be placed on line PP'.

              The vehicle sound emission shall be measured at simulated speeds of 5 km/h to 20 km/h in steps of 5 km/h with a tolerance of ±0.5 km/h for each test speed.

              4.3.3. Method (C) – Indoor facility and vehicle in motion

              The vehicle shall be installed in an indoor test facility where the vehicle can operate on a chassis dynamometer in the same manner as outdoors. All microphone locations shall be as for the vehicle test conditions as specified in Figure 2a of the Appendix to this annex. The front plane of the vehicle shall be placed on line PP'.

              The vehicle sound emission shall be measured at target speeds of 5 km/h to 20 km/h in steps of 5 km/h with a tolerance of ±2 km/h for the speed of 10 km/h or less and of ±1 km/h for any other speeds. The speed of 5 km/h is the lowest target speed. If the vehicle cannot be operated at this speed within the given precision,