Common use of Background noise Clause in Contracts

Background noise. 2.3.1. Measurement criteria for A-weighted sound pressure level The background, or ambient noise, shall be measured for a duration of at least 10 seconds. A 10 second sample taken from these measurements shall be used to calculate the reported background noise, ensuring the 10 seconds sample selected is representative of the background noise in absence of any transient disturbance. The measurements shall be made with the same microphones and microphone locations used during the test When testing in an indoor facility, the noise emitted by the roller-bench, chassis dynamometer, or other test facility equipment, without the vehicle installed or present, inclusive of the noise caused by air handling, facility vehicle cooling, shall be reported as the background noise. The recorded maximum A-weighted sound pressure level from both microphones during the 10 second sample shall be reported as the background noise, Lbgn, for both left and right microphones. For each 10 second sample at each microphone, the maximum to minimum range of the background noise, ∆Lbgn, p-p, shall be reported. The one-third-octave frequency spectrum, corresponding to the reported maximum level of background noise in the microphone with the highest background level, shall be reported.

Background noise. 2.3.1. Measurement criteria for A-weighted sound pressure level The background, or ambient noise, shall be measured for a duration of at least 10 seconds. A 10 second sample taken from these measurements shall be used to calculate the reported background noise, ensuring the 10 seconds sample selected is representative of the background noise in absence of any transient disturbance. The measurements shall be made with the same microphones and microphone locations used during the test When testing in an indoor facility, the noise emitted by the roller-bench, chassis dynamometer, or other test facility equipment, without the vehicle installed or present, inclusive of the noise caused by air handling, facility vehicle cooling, shall be reported as the background noise. The recorded maximum A-weighted sound pressure level from both microphones during the 10 second sample shall be reported as the background noise, Lbgn, for both left and right microphones. For each 10 second sample at each microphone, the maximum to minimum range of the background noise, ∆Lbgn, p-p, shall be reported. The one-third-octave frequency spectrum, corresponding to the reported maximum level of background noise in the microphone with the highest background level, shall be reported.. As an aid for measurement and reporting of background noises see flowchart in Figure 3 of the appendix to this Xxxxx

Background noise. 2.3.1. Measurement criteria for A-weighted sound pressure level The background, or ambient noise, shall be measured for a duration of at least 10 seconds. A 10 second sample taken from these measurements shall be used to calculate the reported background noise, ensuring the 10 seconds sample selected is representative of the background noise in absence of any transient disturbance. The measurements shall be made with the same microphones and microphone locations used during the test When testing in an indoor facility, the noise emitted by the roller-bench, chassis dynamometer, or other test facility equipment, without the vehicle installed or present, inclusive of the noise caused by air handlinghandling of , facility and vehicle cooling, shall be reported as the background noise. The recorded maximum A-weighted sound pressure level from both microphones during the 10 second sample shall be reported as the background noise, Lbgn, for both left and right microphones. For each 10 second sample at each microphone, the maximum to minimum range of the background noise, ∆Lbgn, p-p, shall be reported. The one-third-octave frequency spectrum, corresponding to the reported maximum level of background noise in the microphone with the highest background level, shall be reported.. As an aid for measurement and reporting of background noises see flowchart in Figure 3 of the appendix to this Xxxxx

Background noise. 2.3.1. Measurement criteria for A-weighted sound pressure level The background, or ambient noise, shall be measured for a duration of at least 10 seconds. A 10 second sample taken from these measurements shall be used to calculate the reported background noise, ensuring the 10 seconds sample selected is representative of the background noise in absence of any transient disturbance. The measurements shall be made with the same microphones and microphone locations used during the test When testing in an indoor facility, the noise emitted by the roller-bench, chassis dynamometer, dynamometer or other test facility equipment, without the vehicle installed or present, inclusive of the noise caused by air handling, handling of facility and vehicle cooling, shall be reported as the background noise. The recorded maximum A-weighted sound pressure level from both microphones during the 10 second sample shall be reported as the background noise, Lbgn, for both left and right microphones. For each 10 second sample at each microphone, the maximum to minimum range of the background noise, ∆Lbgn, p-p, shall be reported. The one-third-octave frequency spectrum, corresponding to the reported maximum level of background noise in the microphone with the highest background level, shall be reported.. As an aid for measurement and reporting of background noises see flowchart in Figure 3 of the appendix to this Xxxxx