Defender/Challenger/American Coach F-550 CNG

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Exterior Noise Test

Accelerating from Standstill

Date : 2012-09-28
Personnel : T.S., S.R. & M.Z.
Temperature (°F) : 61 Humidity (%) : 83
Wind Speed (mph) : 8 Wind Direction : W
Barometric Pressure (in.Hg) : 30.07
Verify that microphone height is 4 feet, wind speed is less than 12 mpg and ambient temperature is between 30 F and 90 F: true checked by T.S.
Initial Sound Level Meter Calibration: true checked by T.S.
Exterior Ambient Noise Level dB(A): 44.7

Accelerating from Constant Speed
Curb (Right) Side
Accelerating from Constant Speed
Street (Left) Side
Run # Measured Noise Level dB(A) Run # Measured Noise Level dB(A)
1 66.5 1 68.3
2 66.7 2 67.7
3 66.6 3 67.7
4 66.9 4 66.6
5 66.5 5 68.0
Average of two highest actual noise levels = 66.8 dB(A) Average of two highest actual noise levels = 68.2 dB(A)