Aero Elite Ford 550 Super Duty Chassis-Diesel Engine

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Exterior Noise Test

Accelerating from Standstill

Date : 2011-11-17
Personnel : G.C., T.S., B.L. & S.C.
Temperature (°F) : 63 Humidity (%) : 41
Wind Speed (mph) : 7 Wind Direction : SW
Barometric Pressure (in.Hg) : 30.28
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 S.C.
Initial Sound Level Meter Calibration: true checked by S.C.
Exterior Ambient Noise Level dB(A): 46.1

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 72.1 1 72.1
2 71.1 2 72.3
3 72.2 3 72.4
4 71.9 4 72.8
5 72.3 5 72.8
Average of two highest actual noise levels = 72.3 dB(A) Average of two highest actual noise levels = 72.8 dB(A)