Methods of Testing. 3.1. Measurement of the sound emission of the vehicle in motion 3.1.1. Test arrangement and microphone positions 3.1.1.1. The test arrangement is shown in Figure 1. Figure 1 Two lines, AA' and BB', parallel to the microphone line PP' and situated respectively 10 m forward and 10 m rearward of that line shall be marked out on the test track. 3.1.1.2. The distance of the microphone positions from the line CC', on the microphone line PP', perpendicular to the reference line CC' on the test track (see Figure 1), shall be 7.5 ± 0.05 m. The microphones shall be located 1.2 ± 0.02 m above the ground level. The reference direction for free-field conditions (see IEC 61672-1:2013) shall be horizontal and directed perpendicularly towards the path of the vehicle line CC'. 3.1.2. Acceleration test execution, approach vehicle speed and gear use 3.1.2.1. Acceleration test execution The vehicle shall approach line AA' at an initial steady speed as specified below. When the front of the vehicle reaches line AA' the throttle shall be fully opened as quickly as practically possible and kept in that position until the rear of the vehicle reaches line BB'; the throttle shall then be returned as quickly as possible to the idle position. For all measurements, the vehicle shall be driven in a straight line along the test track in such a way that the track of the median longitudinal plane of the vehicle is as close as possible to the line CC'. 3.1.2.2. Approach vehicle speed The vehicle shall approach the line AA' at a steady vehicle speed equal to its maximum vehicle speed as defined in paragraph 2.12 of this Regulation, if the latter is below or equal to 30 km/h. If the maximum vehicle speed is above 30 km/h, the vehicle shall approach AA' at a steady speed of 30 km/h.
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Methods of Testing. 3.1. Measurement of the sound emission of the vehicle in motion
3.1.1. Test arrangement and microphone positions
3.1.1.1. The test arrangement is shown in Figure 1. Figure 1 Measuring positions for vehicles in motion Two lines, AA' and BB', parallel to the microphone line PP' and situated respectively 10 m forward and 10 m rearward of that line shall be marked out on the test track.
3.1.1.2. The distance of the microphone positions from the line CC', on the microphone line PP', perpendicular to the reference line CC' on the test track (see Figure 1), shall be 7.5 ± 0.05 m. The microphones shall be located 1.2 ± 0.02 m above the ground level. The reference direction for free-field conditions (see IEC 61672-1:2013) shall be horizontal and directed perpendicularly towards the path of the vehicle line CC'.
3.1.2. Acceleration test execution, approach vehicle speed and gear use
3.1.2.1. Acceleration test execution The vehicle shall approach line AA' at an initial steady speed as specified below. When the front of the vehicle reaches line AA' the throttle shall be fully opened as quickly as practically possible and kept in that position until the rear of the vehicle reaches line BB'; the throttle shall then be returned as quickly as possible to the idle position. For all measurements, the vehicle shall be driven in a straight line along the test track in such a way that the track of the median longitudinal plane of the vehicle is as close as possible to the line CC'.
3.1.2.2. Approach vehicle speed The vehicle shall approach the line AA' at a steady vehicle speed equal to its maximum vehicle speed as defined in paragraph 2.12 of this Regulation, if the latter is below or equal to 30 km/h. If the maximum vehicle speed is above 30 km/h, the vehicle shall approach AA' at a steady speed of 30 km/h.
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