Document ID: chunk:federal_register_of_legislation:F2024L00089:reg:800:p13
Version: federal_register_of_legislation:F2024L00089
Segment Type: reg
Provision Reference: reg 800 (pt 13/16)
Character Range: 64542–67723

significant digit after the decimal place (for example XX,X). For measurement of a vehicle in motion indoor and in standstill (forward and reversing), the maximum A-weighted sound pressure level indicated during each period of 5 seconds for each microphone position, Ltest,j, shall be noted, to the first significant digit after the decimal place (for example XX,X).

              Ltest,j shall be corrected according to paragraph 2.3.2. to obtain Ltestcorr,j.

              For each maximum A-weighted sound pressure level, the corresponding one-third-octave spectrum shall be reported for each microphone position. No background correction shall be applied to any measured one-third octave result.

              3.5. Data compilation and reported results

              For each test condition described in paragraph 3.3., the background corrected results, Ltestcorr,j, and the corresponding one third octave spectra of both sides of the vehicle individually shall be arithmetically averaged and rounded to the first decimal place.

              The final A-weighted sound pressure level results Lcrs 10, Lcrs 20 and Lreverse to be reported are the lower values of the two averages of both sides, rounded to the nearest integer. The final one third octave spectra to be reported are the spectra corresponding to the same side as the reported A-weighted sound pressure level.

              4. Test procedures for frequency shift

              4.1. General

              The provisions on frequency shift outlined in 6.2.3 of the main body shall be checked using one of the following test methods to be selected by the manufacturer:

                     Method (A)      Test of the complete vehicle in motion on an outdoor test track

                     Method (B)       Test of the complete vehicle in standstill condition on an outdoor test track with simulation of the vehicle movement to the AVAS by an external signal generator

                     Method (C)       Test of the complete vehicle in motion in an indoor facility on a chassis dynamometer

                     Method (D)      Test of the complete vehicle in standstill condition in an indoor facility with simulation of the vehicle movement to the AVAS by an external signal generator

                     Method (E)       Test of the AVAS without a vehicle in an indoor facility with simulation of the vehicle movement to the AVAS by an external signal generator

               The facility requirements as well as the vehicle and test setup specifications are the same as given in paragraphs 1., 2., 3.1. and 3.2. of this annex according to the selected test method unless the following paragraphs below provide different or additional specifications.

               No background noise correction shall be applied to any measurement. Special care shall be given for outdoor measurements. Any 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