ANNEX I APPARATUS, CONDITIONS AND METHOD OF MEASUREMENT

3. METHOD OF MEASUREMENT

3.1. The microphone must be located 250 mm to the side of the centre plane of the seat, the side being that on which the higher noise level is encountered.

The microphone diaphragm must face forward and the centre of the microphone must be 790 mm above and 150 mm forward of the seat reference point described in Annex III. Excessive vibration of the microphone must be avoided.