XB Freightliner

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Exterior Noise Test

Accelerating from Standstill

Date : 1999-10-29
Personnel : B.L. and R.H.
Temperature (°F) : 58 Humidity (%) : 69
Wind Speed (mph) : Wind Direction : Calm
Barometric Pressure (in.Hg) : 30.35
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 B.L.
Initial Sound Level Meter Calibration: true checked by B.L.
Exterior Ambient Noise Level dB(A): 42.9

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 82.9 1 85.0
2 83.0 2 85.3
3 82.9 3 84.6
4 82.5 4 85.3
5 82.7 5 84.8
Average of two highest actual noise levels = 83.0 dB(A) Average of two highest actual noise levels = 85.3 dB(A)