Ford F550

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Exterior Noise Test

Accelerating from Standstill

Date : 2010-07-23
Personnel : B.G., T.S., B.L. & S.C.
Temperature (°F) : 74 Humidity (%) : 80
Wind Speed (mph) : 1 Wind Direction : SSW
Barometric Pressure (in.Hg) : 30.0
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): 45.0

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 69.5 1 71.2
2 69.3 2 73.2
3 70.5 3 71.5
4 69.8 4 74.3
5 69.4 5 74.3
Average of two highest actual noise levels = 70.2 dB(A) Average of two highest actual noise levels = 74.3 dB(A)