AC SERIES/CHALLENGER/DEFENDER/AMERICAN COACH

IC Bus/Champion Bus, Inc./General Coach American, Inc. Pdf Download PDF Report

Exterior Noise Test

Accelerating from Constant Speed

Date : 2012-04-18
Personnel : T.M., T.S. & E,D,
Temperature (°F) : 46 Humidity (%) : 57
Wind Speed (mph) : 7 Wind Direction : NE
Barometric Pressure (in.Hg) : 30.27
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): 35.3

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 70.7 1 72.1
2 70.6 2 72.4
3 70.8 3 71.4
4 71.0 4 72.9
5 70.1 5 71.8
Average of two highest actual noise levels = 70.9 dB(A) Average of two highest actual noise levels = 72.7 dB(A)