XB Freightliner

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Exterior Noise Test

Accelerating from Constant Speed

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: false checked by B.L.
Exterior Ambient Noise Level dB(A): 42.7

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 83.9 1 83.2
2 83.7 2 83.1
3 84.3 3 83.2
4 83.4 4 83.4
5 83.9 5 83.2
Average of two highest actual noise levels = 84.1 dB(A) Average of two highest actual noise levels = 83.3 dB(A)